John Brett

John is a professional engineer with 50 years experience.

John has designed and built many cars, trucks, and vehicle assembly facilities.

John has worked on design of roads, bridges, cranes, transmission towers, and buildings, and operation, maintenance and upgrade of hydro and gas turbine power stations.

John was a LVV Certifier for 13 years. John has long been a whistle-blower, expressing the view that the LVV system is dangerously deficient. John’s authority was revoked in December 2012.

John rides a 1992 Yamaha FJ1200ABS, and is also a keen road and off road cyclist.

APOLOGY

“The LVVTA has brought it to my attention that statements I have made in relation to it and its employees may have been perceived as defamatory.

I sincerely regret that and apologise for any harm caused. I have taken down the statements identified by the LVVTA of concern to it.

I have strong views about the low volume vehicle certification process and intend in the future to direct my energies into the public inquiry now being held in relation to it.”

John Brett 7th October 2015

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Classic Nissan

The rear wheel drive Nissans are absolute classics in their own right, and a gold-mine for anyone wanting to build a fast, reliable, good-handling car, either for road, track or drifting.

Nissan RB25DET

Nissan RB25DET


Nissan SR20DET

Nissan SR20DET

There are the six cylinder cars- Skyline, Laurel and Cefiro, and the four cylinder cars – Sylvia, 200SX, 180 SX, all available with and without turbo.
The sixes (the RB’s) come on 2 litre 2.5 litre, 2.6 litre (the Godzilla) and 3 litre (Aussie Nissans and Holdens) It is possible to build a RB30DET by taking an aussie 3 litre block and fitting an RB25DET head. It is common to fir bigger turbos, and some phenomenal power outputs can be achieved.
The fours (SR’s) are no slouches either- conversions of a DE to a DET by fitting a turbo are common, as is fitting bigger turbos.

The suspensions on all of these cars is basically sound from the get-go, and respond well to fitment of adjustable platform struts (coil-overs), adjustable camber arms, caster bars, etc.

The braking systems can generally be interchanged- the bigger brakes come with 5 stud hubs.

Front Intercoolers are commonly fitted, and often holes cut in the inner guards for Intercooler ducts.
There is a problem with later, “frontal impact” cars- no LVV Certifier can test the crash performance of a car, so cannot approve anything that affects frontal impact. We heard of a man who bought an intercooler kit from Japan, and followed the instructions to modify the front siderails to make it fit. He ended up having to have the whole front of his car re-built with new side-rails. If your car is fitted with airbags, or is later than about 1997, check FIRST with your LVV Certifier

John Brett Technology Ltd. Ph 0800 LOWVOLUME (0800 569865)

177 comments to Classic Nissan

  • John Gemmell

    Hi, just a question.

    I have a toyota windom with a 3.0 V6 motor in it. If I sourced a motor from another toyota which is the 2.5 litre 6 cylinder twin turbo and put it in my car would this have to be certed? Can you Please provide a list of all modifications that require certification as this is going to be on ehell of a project. Thanks, John

  • johnbrett

    Hi John-
    Yes that mod would need to be Certed, and I can’t see much of a problem with it.
    List of all items that need to be Certed are here- http://www.lvvta.org.nz/CertThresholdScheduleApril04V3.pdf
    All mods on a car have to be Certed at the time

    Regards

    John

  • Nicholas Hill

    Hey John,

    I have a mazda b6t FWD 323 wagon 1989 model, i’m planning to take this 100kw turbo engine out of this wagon and place it in a non-turbo mazda 323 sedan 4WD 1995 model which currently has a 79kw b6 engine. No modification to the mounts or engine bay is required (same engine block and head, just a turbo bolted on basically and a lower compression ratio) (4wd gearbox bolts straight up to). I was wanting to know if anything needed upgrading in the way of brakes or anything else before i get a cert for it. The rest of the the 1995 mazda sedan is straight stock standard. Also how much does a cert cost? And is there a cost to re-do it if you fail the first time?

  • johnbrett

    Hi Nicholas
    Sounds like a pretty straightforward Certification. The LVV Requirements for brakes is to perform 3 stops from 100 kph, I think that your standard brakes would cope, although if you could get a set of the bigger brakes now would be a good time to fit them.
    At John Brett Technology (Low Volume Vehicle Certification) we aske that you present the car in a WOF condition- and recommend that you get a WOF check done first to be sure. That way you are likely to get a pass on the first LVV Inspection. We don’t charge extra if a recheck is needed, but obviously don’t want to be doing repeated re-checks for WOF items. Phone us on 0800 LOWVOLUME to discuss prices, and appointments available.

  • shaddz

    Sorry another random question!
    I have a 94 s1 R33 skyline…..Was a GTS25.. but have bolted on a turbo and supporting fuel mods & management…..dyno shows 201.5 HP ATW currently but only because of missfire at 10 pounds of boost….Factory states 180Hp for the N/A. Do you think the brakes will be sufficient for cert? I really dont want to mess around getting new rims and tyres to suit a 5 stud conversion.

    • johnbrett

      I thought that a GTS25 had a turbo from standard?
      Brakes on all of these Nissans are all good. The LVV Cert requires 3 stops from 100 to 0. Your car should be fine without upgrade.

  • shaddz

    Thank-you for the promp reply!
    The GTS25 came out as a non-turbo model of the GTS25T, with 4stud hubs instead of 5, and the Weaker rb20DET varient gearbox. Hopefully everything else will be upto spec aswell. I understand That I will also need to fit a catalyctic (sp?) converter and catch can to pass??
    Another slight worry i have is the chassis rails (or what i think are chassis rails) seem to have been crushed in ever so slightly on both sides in the same place, almost as though someone has hit a speed bump and bottomed out? Will this be an issue? It never has been with WOF’s…..

  • John Brett

    Hi- Thanks for putting me straight about models. We have to meet an emission standard, which means that you need the POSITIVE CRANKCASE VENTILATION SYSTEM left in place, and no catch-can. (Why do people want to put Catch cans on engines?) As you are not changing the engine, we do not need to require a Cat, or to do the on-road emission test.
    The Chassis / floor rails damage needs to meet WOF requirements- so will probably be OK

  • Dylan

    Hi,

    I’ve recently had some bucket seats fitted to my Nissan Skyline 1989 R32 GTST and wondering about the certification process for these… They have been put together using aftermarket base brackets as well as aftermarket rails however have retained the factory mounting positions and the seat belts have not been altered in any way other then changing the seat beat clip in pint from the standard seat to the after market base bracket mounting point. Is this alright?

    Cheers.

    • johnbrett

      The problem area is in the strength of the seatbelt mounting- the load on the buckle is 15 Kilonewtons (about 1 1/2 tonnes force). The standard rails are tested to this load, but with aftermarket rails there is no certainty that they are strong enough. Any welding also comes into question. If in any doubt, you should bracket the seatbelt buckle directly to the floor mount, using 40 x 3 flat steel strip.

  • Great post, you seem to know your stuff. I did find a few points that I was unsure about, but thanks to Google I now understand your points fully.

  • sam

    hi have a 1985 mazda bongo with a 12a rotary fitted what problems will i run into for a cert with the emission standard as this motor runs a pre mix fuel and oil

    • johnbrett

      Hi Sam- I have done emission tests of 12A rotaries, and been able to pass them. I have never done one with Oil premix, so I don’t know how it will work out. The best advice I can give is to get it tuned properly, so there is minimal unburnt hydrocarbons coming out of the exhaust. A good tuning shop with an exhaust gas analyser would be able to help.

  • Mike

    Is it true that you dont require a cat if you are a member of a racing motor sport club.Saw in item 5:9 i think it is that states:-

    A low volume vehicle is not required to be fitted with a catalytic converter if the vehicle is designed and operated primarily for motor-sport activities, and runs on leaded or racing fuel, and:
    (a) the vehicle owner is a member of a national motor-sporting regulatory body recognized by the Low Volume Vehicle Technical Association (Inc); and
    (b) the vehicle owner holds a current and valid competition driving license issued by a national motor-sporting regulatory body recognized by the Low Volume Vehicle Technical Association (Inc); and
    (c) a current and valid competition logbook has been issued for the vehicle by a national motor-sporting regulatory body recognized by the Low Volume Vehicle Technical Association (Inc).

  • matt

    was wondering if it was required to get a cert if i have swapped a rb25det with its 0riganal rb20det into an r32gtst???

  • Angus

    i have a hilux with a 5MGE supra engine on the standard bolts and mounts how much would this cost to cert?

    • johnbrett

      Hi Angus- Approx cost about $500.00 depending on what other mods there are. Best idea to phone us, on 0800 LOWVOLUME (0800 569865) if you in or near Auckland.

  • Ben

    Hey there i have a 1993 r32 nissan skyline that came out as a standard Rb20DE, it was made into a rb20de+T but was heavily modifyed and got about 300hp out of it, of course the non turbo engine couldnt handle this and it blew up, so iv had a genuine rb20DET put in, i was woundering if you could please tell me what i will need to do in order to pass cert??
    thanks.

    • johnbrett

      Hi- this is a pretty common conversion- with no big Certification problems. Was it Certified with the converted motor? If it was, then there is no need for a new Cert, as you have just done a “Repair” by changing the engine same for same.
      If it was NOT Certed, then to get Certed you will need – two driveshaft loops, and a Catalytic Converter. Brakes are usually OK whether standard or changed, any suspension or wheel changes have be Certed, any seat changes. Phone us on 0800 LOWVOLUME (0800 569865).

  • brandon

    hi, i have a holden vl rb30e and have just put a turbo on and was wondring what tests are done to get cert. I know about the braking, heat sheld, wastegate has to be plumbed into exhaust but is there an emissions test? and do i need drive shaft loops? ( i havent done any thing to the drive train) do i need a fan cover and is there any clearances between intercooler piping and pullies?

    • johnbrett

      Hi– in answer – the Emissions test is needed IF you have changed the engine, but NOT if you have modified an existing engine. The braking test is to do 3 stops from 100 kph, and some Holdens are a bit marginal. You might be OK if you fit high performance brake pads- a good brake shop should be able to advise. You WILL need Driveshaft safety loops, two if a two piece driveshaft, at the front end. Fan- you DO need a finger guard over the top of the fan. There are NO set clearances between intercooler piping and pulleys, it is just a matter of reliability- is it going to hit and damage something? Hope this helps

  • Martin

    Hi John
    I got a cerfio a31 just wondering if it is ok to cut another intercooler hole into where the battery goes (battery in boot now) as i have changed to a front facing intake plenum problem is the intercooler piping that was in before the piping went just above the siderails and the hole has no way of connecting to the intake yet i dont want to affect frontal damage what could be some options?
    Thanks Martin

  • Craig

    Hi John,

    I have been restoring a 1973 Mitsubishi Galant Colt GTO. I have an SR20DET lined up ready do go into it and wondered if I should be looking at getting a pair of ‘Modern Brakes’ for the car aswell. As I am told that this is a good idea to get the engine/brakes all certed at the same time, due to the cost of certing it.

    If so what kind of brakes would you recommend? And have you done something like this before? any tips? e.g. With repowering old classics with modern engines?

    Thanks,
    Craig

  • johnbrett

    That an oldie! Why not use a Mitsi motor like a 4G63, it will be all Mitsubishi that way. The turbo motor will make that car a real handful, I would stick with a non-turbo motor just for safety.
    The LVV Test is 3 or 5 stops from 100 k to 0, the standard brakes may just pass, but it would be far better to look for better ones. I don’t know what fits, but start with a Mitsi wrecker, and look for bigger discs and calipers from some later Mitsi, say an Eterna or Sigma. The best plan is to ask ask ask, there could be some stetup you can bolt on. If you need to adapt the calipers, its OK to get brackets made up, try to avoid welding, get them machined from a solid block.
    I would suggest sticking with the standard rear brakes, it’s the fronts that do all the work, also you don’t want to end up with too much braking at the rear because you will get rear wheels locking, which is dangerous.
    Whatever you can find, remember that you have to get a wheel over it- you might want to go to say 17″ wheels just to clear the calipers, remember that floating calipers need room to float. Don’t get trapped into needing spacers or adaptors just to clear the brakes- the wheels might look good sticking out, but too much offset basically stuffs up the steering and handling. Good luck, John

  • Arron

    Hi John.

    I have heard you can’t cert body swaps any more. Is this true? I am looking at putting a Hilux Cab onto a Nissan safari Chassis (1991 ish). Whats the story? My other option is to put the Nissan axles coils etc under the hilux chassis, but this seems like a lot more work. Any recommendations much appreciated. Thanks.
    Arron.

    • johnbrett

      We have been getting some strange rulings from the LVVTA lately. It will probaly be classed as a “Scratch Built” Vehicle, so you would need a Certifier with that category. Best you talk to a scratch-built Certifier first.

  • D'arcy Spen

    Dear Sir, I have a Rover SD1 2600 with a very tired motor which will need a complete overhaul. What would be required according to the regulators to fit a Toyota 5M-E motor and auto gearbox?

    Yours sincerely,

    DS

    • johnbrett

      Is this a 5M-GE? This would be a simple swap to Certify, basically it comes down to common sense. The weight, power output, and size would be similar to the original engine, so no concerns there. I have no idea how the engine mounts line up, but if you make a sensible job, of (say) adapting the Toyota mounts to the Rover mouting points, and similar for the gearbox, there should be no issues. You would need to have the driveshaft modification done by a driveshaft specialist, produce the receipts, ALSO fit a Driveshaft safety loop. Exhaust Emissions: Keep the engine’s PCV valve and crankcase ventilation system. Catalytic Converter not needed. On-road Emissions test required, so keep the fuel system all standard for the engine. Regards John Brett

  • Elvis Peter

    Hi John i spoke to you the other day thanks for the great info i forgot where you had mentioned to place the safety loops for the drive shaft and also i see on your other comments that a brake upgrade it not neccesary as the standard 4 stud skyline brake setups are ok but im planning on upgrading the turbo and putting a big front mount intercooler and upgrading the computer would i then require a brake upgrade to the 5 stud setup? and also will i be needing a catalytic converter for the exhaust system? i also intend on changing the seats to some aftermarket seats what are the requirements for the mounting? is there also a requirement for certing for bodykits?

    • johnbrett

      Hi Elvis Peter- It is best to phone us and go through your vehicle. Safety loops have to be within 150mm of the front joint, of each section of driveshaft. Brake upgrade- The LVV Standard requires us to TEST the brakes- 3 or 5 stops from 100 kph. MY experience of Skylines is that the smaller brakes will pass, but obviously fitting the bgger brakes is better. You also have to meet the Exhaust gas Emissions standard, which requires a Cat, plus the standard crankcase ventilation system (no catch-cans) The Certifier has to do an onroad emissions test also. For seats, ther problems arise when rails are changed. The new rails may not be strong enough for the seatbelt buckle, so we ask you to bracket the buckle back to the floor mounting point of the seat. If your skyline is a 2 door, there needs to be a folding seat for access to the rear. Bodykits are not usually an issue, but a ‘frontal impact compliant car’ needs to retain all the front structure, bumper beam, etc, no changes to chassis rails. Hope this helps – John

  • Elvis Peter

    Sorry i forgot to mention my questions are in relation a R32 Coup non turbo engine transplant form RB20DE to RB20DET thanks

  • D'arcy Spen

    Dear Sir, Thankyour for your reply regarding the repowering of a Rover SD1 2600, your advice is noted.

    In answer to your query regarding the Toyota motor type, yes it is a 5M-E motor, SOHC,crossflow design from a 1981 “Cressida” rated at 145hp,8.8:1 comp. ratio,with a 4 speed auto.

    The project is planned to be completed by December 2011.

    Yours sincerely,

    DS

  • Louie

    hey i was thining of putting bonnet pins on my skyline, before i do it i was wondering if it would pass a warrent with them without getting a cert

    cheers

  • gmcd

    Hi there, I’m looking at replacement diesel engine for my Nissan Terrano 93 D21 TD27T2 73kW. This is mechanical inj and all newer models are EFI, so I would need an ECU to run the pump ?
    What are my limitations?
    Can I use a QD3.2 110kW intercooled turbo from R50 or even R51 YD25 or do i need to stick with newer version of TD engine?
    Thanks

  • Brandon

    Hi would I need to cert ke30 if I swop the 3k with a 5k ?

    • johnbrett

      I cannot figure out what a 5K engine is. If you are fitting a different TYPE of engine you will need a LVV Cert. This includes changing to Turbo version. What exactly is the difference between a 3K and a 5K?

  • matt

    hi
    Im about to fit an intercooler to my car was a sr20de s13,
    – how much can i cut out of the crash bar?
    – and can i make my own crash bar to fit around intercooler?
    – do i need a catylitic converter as ive changed th engine to rb30det?
    -ive also got a catch can (as ive changed inlet manifold) that vents to atmo is that certable?

    cheers matt

  • brandon

    the differance between the 5k and 3k is just the piston size the rest is pretty much the same from what i can see

  • John Brett

    Reply to matt- Sorry I didn’t reply earlier-
    1 You can’t cut anything out of the crash bar. If your car is a frontal impact model you can’t modify the frontal impact structure in any way. This is because we don’t do crash-testing on customers cars.
    2 If you change the engine, you need a cat, unless the car wasn’t built with one, or if the engine was not fitted with one.
    Crankcase ventilation to atmosphere is not allowed, has to have the PCV Valve back into the manifold.

    Hope this helps

    John

  • Nathan

    hi there!

    thanks for answering all these questions, accessible info like this is great.

    so. car is 4×100 pcd. currently it has a gutless 1.6l motor. I’d like to change It to a holden. 308 as its an easy swap. aside from bigger brakes and everything else- should I be upgrading to 5 stud front hubs or is that not a requirement?

  • johnbrett

    Thanks for the compliments Nathan. I have lost the thread, not sure what car you are talking about.
    1 There is no fixed requirement to upgrade brakes, the test is does the vehicle pass the LVV Brake test. Not knowing what car I don’t know how it would go.
    2 A Holden 308 is a big heavy engine for a 1.6 litre car- and not especially powerful. The weight and size could be problems. Is there not a Jap turbo motor that will fit?
    Regards

    John

  • Josh

    What’s the go with battery being in the boot of the car in a vr4 1988 ? I’ve been told no cert needed is this true ?

  • Spudd

    Hey there ive got an 93 d21 navara ute with a td27 in it i needed a bit more power so added a turbo from a turbo terrano with the same engine which was a bolt on,now when i went thtough the testing station i was told it needs a cert because that model ute never came out with a turbo so i took it down to a mechanic and showed him my wof paper he told me they did come out with a turbo model and he drives one himself,

    so yeah any advice? cheers

    • johnbrett

      Hi – You need LVV Certification because that’s what the WOF guide says. Obviously the Navara should fly through a LVV Cert for the Turbo, no issues with brakes etc. Hope this helps John

  • jordan

    hey john some good info you have up there mate just a few questions im doing a swap on a 1985 nissan r31 skyline passage its the japenese version. im putting a rb25det in it i have one with 300kw would you be able to tell me what i need for a cert?it came out with a rb20e automatic it was converted to manual and certed but the old owner never picked up the cert plate i think i still have the paper though. i gather i need drive shaft hoops and im going to put bigger brakes up the front but it is drum brake in the rear so i dont want to have to change all brakes will just better fronts be ok?

    • johnbrett

      Hi Jordan – You will need a Cert for the engine change. Driveshaft loops WILL be required. The factory brakes will probably pass the Cert requirements (Good cars these) but an upgrade would be good, and get it all on the same Cert. The front brakes do the hard work, I suggest leaving the rears unless you can get the parts easily, or do a lot of towing! Regards John

  • jordan

    hi cheers for the quick reply john. ok i will upgrade the fronts only will put bigger brakes from a newer skyline i also need somewhere for my intercooler piping to go my batery bracket has been removed due to batery going in boot but is it ok to cut a round hole in where it was ? i see someone else has asked this to but didnt quite get the answer something to do with a crash test or something i have seen holes cut before but is it just better to try and find another way for the piping to run?
    cheers for the info

  • johnbrett

    Hi Jordan- Hole for I/C pipe is OK. Issue is with ‘Frontal Impact’ cars (from about 1995 on). On those cars you can STILL make a hole in the inner guard, but NOT change any of the front structure such as trimming the chassis rails or bumber beam. You are OK with what you are going to do. Cheers John

  • Val

    Hey John.
    I am going to buy a 3L 5 speed vl gts and it has a rb25det in it.I was just wondering whether I needed a cert for it?

    Thanks

  • Craig

    Hi John, great site you are running here!
    I have a R32 GTR, which came from Japan with a few modifications. One is that it is fitted with the front brakes off a R34 GTR (324mm disc, Brembo 4 pot vs standard 296mm disc, Sumitomo 4 pot) with the matching master cylinder. The brakes fit unmodified. The same Brembo brake setup also came on the R32 GTR V-Spec (obviously mine is a non V-Spec). Does this require a cert? From what i was told it came through compliance like this, only requiring a cert for the adjustable suspension.
    Thanks, Craig

    • johnbrett

      Hi Craig- what wonderful cars these are! This sort of swap can be carried out easily, without any problems. The Entry Certification inspector probably did not notice the brake change. Any brake change DOES need a LVV Cert- because the potential for people to do something stupid and dangerous is high. We couold arrange for the Cert if you wanted. Regards

      John

  • Craig

    Thanks John! I may as well add a few more mods to the list then and get it all certed together, shall be in touch when shes done! Thanks for your help.

  • jordan

    hey again john i had a read up on the aftermarket seats bit thats up here but i just want to check….so if i put my aftermarket seats on my factory rails then its fine?? as they fit on fine and i havent had to move any seat buckles or anything and how many drive shaft hoops are required? is it 1 or 2 ? cheers

    jordan

  • johnbrett

    Hi Jordan- for a two piece driveshaft, two driveshaft hoops. New seats on factory rails are fine. Seatbelt buckle is not affected, so no problem there.

  • Tex

    Hi John, i have got a 1990 skyline R32 Coupe factory N/A RB20 De, i have done some extensive work to it so far and i would like to convert it to a RB20 Det,i have been tidying it up etc, it has had 15 previous owners and i have taken my time restoring it as i would like to keep it, so far the car has got Certs for kings lowering springs, Hicas removed, gearbox X mounts from the previous owner. I have converted it to 5 stud and the big 4 pot caliper brakes & brake lines and put LSD diff in it done by proffesionals do i need Certs for my Diff?, my DET motor is getting rebuild at the moment as i would like to have a peace of mind once i put it in, what’s bothering me at the moment is that the previous owner cut a hole(square) approx 20x20cm by where the factory airbox used to be just below the inner left guard as he ran a pod filter,far off from the side rail/wall and hasn’t modified the front iron bumper bar at all, would this be scrutinised when i take my car in for Certs?? as i would like to run my intercooler pipings through it..my gearbox and engine should be ready next week to be put in and i have been eliminating faults just from your replies to the questions on here(many thanks to you!)..but yep i dont wana muck around and take it in for Certs straight away as this is my daily driver,as i cant afford to get it PINK stickered and any other advice would be appreciated,many thanks in advance.

    • johnbrett

      Hi – sounds like a very worthwhile project, and a good car at the end. All the mods sound good, except the holes for the intercooler piping. Yours is not what they call a “Frontal Impact Compliant” car so its not such a big deal, but we need to keep to a ‘General Safety’ standard. Can you email me photos of the hole, to john@lowvolumevehicle.co.nz. I can come out and do a site visit if you like. Regards John

  • Tex

    Sure and thanks for the prompt reply, i will email you pictures when i finish my shift tonight, Cheers.

    • johnbrett

      Those holes will not be a problem. Just tidy them up a bit, smooth the edges and put some paint on them. Regards

      john

  • JT

    Hi, I have a 1984 300zx and i want coilover suspension problem is it has seperate spring/shock semi trailing arm rear suspension, is it certfiable to replace seperate spring/shock set up to a single coilover unit in the original shock mount? as for the front is it legit to cut strut tubes and weld on coilovers?

    • johnbrett

      Hi Jarrod- At the rear, the shock mount is not strong enough for the spring loads. You can get adjustable spring setups for similar setups, they have an adjusable base, and spring to fit on top.
      On the front, you can get ‘slip over’ adjustable units- no need to weld anything. Welding causes too many problems. Also remember if you are fitting stiffer springs, you need stiffer dampers (shock absorbers)
      Hope this helps

      John

  • Tex

    Hi again John, I got in contact with you couple of months ago about my R32 Skyline coupe, I have now upgraded and installed a Rb25 det motor in it note that is was only running a Rb20de, well just and update as I saw a lot of dodgy work done by the previous owner, I have installed brand new hanger bearings for the driveshaft and now waiting for the loops to turn up and installed b4 I book you in for the Certs. Below is a list of work I have done and has been certed, if you could point out what else I need to be sorted before we set a date for cert, please bare in mind that this is my daily driver and im currently off the road as I am on work leave :).

    Certed – Superlows, gearbox crossmembers, Hicas removed(will you be running over these again?)
    Mods : LSD tight differentials(shimmed)
    – 5 stud conversion
    – Bigger GTST brakes(just installed brake booster this morning)
    – 17 inch ROTA mags – 9.5 inch wide(not rubbing the guards)
    – Side mount intercooler(unseen from the front as I would like to keep it a sleeper) ps iv tidied those holes.
    – running factory turbo (custom plumbed back in turbo dump pipe)
    – Exhaust is 3 inch from the turbo(CAT converter installed) to the rear factory GTR exhaust

    Now I haven’t run the exhaust yet, im assuming that the CAT converter is all I need for certs, if you can point out anything else I needed to be done I would really appreciate it, Cheers.

    • johnbrett

      Hi Tex- it all sounds good- I can’t think of anything you have missed. I could come out to have a look if you like.
      Regards
      John

  • Car enthusiast

    Hi i have a few cars(5) few need to have certs but i do not like being raped by the prices for an example

    i have 3 cars that need a cert do i get a cert or do i wait till everything is done then get a cert as every thing that will need to be re-certed will cost me or will it?

    I have a 1982 ford falcon was 4.1L now it has a 351c v8 all factory XD v8 mounts and xmembers i have done a lot of mods to it 15″ wide wheels, disc rear end just to name some

    I also have a nissan bluebird hnu12 1990 sss attesa 4wd manual sr20de i have added a turbo kit from a s15 silvia, the setup looks stock(passes wofs LOL) and r33 gts front discs(gts have larger 4 stud disc’s) i have 4 pot r33 gts25t calipers with bolt on spacers and then

    I have a 1990 nissan skyline r32 4door it was a 1.8L 4 cylinder gxi now i have my old rebuilt 4.1L xflow motor with ford falcon XY hydraulic bell houseing and xd 3 speed manual box(all this to keep the hydraulic clutch setup) xf 1 piece driveshaft, it has a t04e turbo, megasquirt ecu, all sitting in its place,

    I am now seriously thinking of converting the skyline into a ute by welding rear doors up putting a datsun 720 rear roof/window in and welding support bars in for the rear doors, the only problem is
    to get a cert for big jobs like turning it into a ute do i have to see the cert guy for progress updates or do i have to sketch/write what im planing to do on paper prior to doing it? can i do the work then go for a cert?

    Cheers

  • mark

    hi took my car in for wof, its fail on my (heim joint) steering bump steer ends. its lowered so am I able to put some reputable angled tie rod ends on and will they need a cert considering they are identical to OEM tie rods but with the angle in them. thanks

    • johnbrett

      The vehicle, the suspension, and the tie rod ends will all need to be certified. Normal tie rod ends will cope with any lowering of a Nissan that can be certified, so no point in spending the money on angled joints.

  • CALE

    Hi there I was jus woundering , i have a 89 r32 rb20de that the engine has now blown and have another 89 r32 but rb20det that had a previous lvv cert but rego has lapsed , if I was to do a engine swap would I have to get it cert’d again?
    Thanks

    • johnbrett

      If the rego has lapsed, the LVV Cert does not have to be re-done. If you put the DET motor into another car that had a DE, you need a new cert for the car. Hope this helps. John

  • kev

    hi i have an old datsun and i am doing a and engine conversion and was wondering if iam allowed to replace my hard fuel line with some braided lines? thanks

  • Linds

    Hi, I’ve recently bought a 1989 hr32 skyline. It had a rb20e and auto trans standard. No air bags or abs. Someone has converted it to a rb20det manual.
    I think I’ve got it all sussed to pass a cert except i just noticed they’ve cut the whole front bumper beam out to fit the front mount intercooler. Just want to know if that’s ok or if i should get it replaced by a pannel beater and just cut enough to fit?
    Cheers Lindsay

    • johnbrett

      Hi Lins- OK so your skyline is not officially a ‘frontal impact compliant’ car, so we are just looking at general safety requirements. If it was frontal impact NO cutting would be allowed. As it is, it will depend on the LVV Certifier’s opinion as to whether the vehicle’s safety is compromised. I think the beam you mean is a steel channel, bolted onto the bumper mounts. Other skylines can fit an inter-cooler without having to remove or cut it- I would recommend replacing the beam, and re-positioning the intercooler. Regards- John

  • Linds

    Hi, thanks, thats what I’ll do, great. Also one more question, it has a (I think) 3 inch exhaust, I’m getting a catalatic converter but will It be looked at, it’s pretty loud? I’ll have it checked for a wof before the cert…

  • Car enthusiast

    Hi John

    Sorry i have not rung you but i have been very busy
    Do i call you on 0800 569865 ? During the week?

    I am in Palmerston North

    Cheers Phil

  • Thomas

    Hey John,

    I’ve recently put a Evo 6 engine/gearbox/transfer case into a 4WD mirage hatchback (CL2A), they come 4WD from factory and are very rare. The front of the car is basically an Evo 4+ and the rear is Evo 123 so all Evo parts bolt straight in which is handy

    I have also changed the front and rear lower control arms to Evo items and also the front and rear hubs to 5 x 114.3 Evo items. The brake calipers and discs are also Evo items. I presume all of the above needs to be certified?

    Also I want to confirm, I will need 2 x drive shaft hoops and also a cat converted installed for certification? What would the cost be to certify all the above?

    Many thanks!
    Thomas

    • johnbrett

      Hi Thomas- I have done these before- they make an awesome little car, shorter, lighter, and more agile than an Evo saloon.
      Yes, you need driveshaft safety loops
      Yes, you need a cat IF the original car AND the new engine had a cat.
      ALL the mods need to go on the Cert- I expect your brakes will be no problem.
      We would charge $570.00 for that Cert, all inclusive

      Regards

      John

  • Thomas

    Hi again John,

    I do have an external wastegate too which I understand needs to be certified too

    Thanks
    Thomas

    • johnbrett

      Hi Thomas- This is a big revenue earner for the NZ Police. I have learnt that YES- it is considered an ENGINE MODIFICATION REQUIRING CERTIFICATION! Make sure that the waste gate is plumbed back into the exhaust, or has a compliant exhaust and silencer.

  • Simi

    Hi john

    Just wondering, I just brought a 95 Nissan navara which has been fitted with a td27t engine from a terrano, which bolted straight in!! Does this need to be certed?? And if so how much am I looking at??

    Cheers
    Simi

    • johnbrett

      What was the original engine? If an engine is changed to a different type, or modified it would need a Cert.
      You need to phone us for a quote
      Regards John

  • Lenon

    Hi, I have a non turbo r32 skyline and was planning to put in a 20det motor with the factory side mount and everything. What would be needed for a Cert?

    • johnbrett

      Hi- I’m busy preparing for the Court Case right now. I’ll reply properly in early December

    • johnbrett

      Hi Lenon. Sorry to be so slow in replying. Your car will be a straight forward certification. Items to do are: Driveshaft loops (2), Crankcase ventilation- standard PCV Valve not an external vent. Vehicle will otherwise need to be in WOF condition. Hope this helps John

  • Lenon

    Many Thanks for the reply john.

  • karl

    Hi John,
    I have a 1988 holden vl vacationer 2l which now has a rb25 det in it all factory stuff except the intercooler. Will this need to be certed? An roughly how much would it be?

    • johnbrett

      Hi karl- This is certainly going to have to certified. The brakes are likely to be an issue- it will have to do 5 hard stops from 100kph. Holdens usually fail unless they have the V8 brakes fitted. Our phone No is 0800 569865

  • Matthew

    Hi John,

    Im planning on buying a 1999 C35 Nissan Laurel that will be manual converted and repowered with an RB20DET engine. I plan to add a frontmount Intercooler which would require cutting the inner guard to fit. Because it is a frontal impact car, this would not be allowed for certification. How would i go about adding the front mount intercooler? Would i need to make a custom piping setup to fit without cutting an metal?

    Regards,
    Matt

    • johnbrett

      I have Certified many frontal impact Nissans, (Skylines and Silvias), with the hole in the inner guard. Now these sort of decisions are made by the LVVTA in Wellington. It might pay to phone them first. Cheers, John

  • Jared

    Hi John

    Done a complete rebuild and transplanted a 1jzgte into toyota supra 1994. How much for a lvv certification on fuel system running under the car surge tank is up under the diff and the 044 pump is also mounted under the car, The motor itself 1jzgte single turbo is completely rebuilt by a reputable engine builder putting out a lot more power than the factory engine 2jzge ( to be confirmed at dyno ), Transmission is the original but has been made to be manually shifted auto, Brakes have been upgrade to the supra 4 pot front 2 pot rears off the 2jzgte model, wheel adaptors are on the front only to clear the bigger brakes, rear seat bottom part has been removed as installed a pair of subs and amps instead just want to make as a 2 seater car, battery relocated to the boot, and anything else you would think that needs to be done please advise as want the car to be completely legal and not have any issues with police. Many thanks Jared.

  • Jacob

    Hi there
    i am currently working on my r32 skyline it now has a rb20det with external wastegate (plumbed in) frount mount. full 2.5inch straight through with a coby half way. also have the loops to put in. currently still has 4 stud hubs and non turbo brakes and im wondering if they’ll pass a cert like that or if ill have to convert to 5 stud bigger brakes. any info about things ill have to do will be greatly appreciated

    • johnbrett

      Should pass the LVV Brake test with existing brakes (Skylines are good cars). If you WANT to upgrade the brakes later, you would need another cert though. Hope this helps Cheers John

  • Sam Game

    Hey I have an r32 and it had a ca18 in it and now it has a rb20det in it and has a manual conversion, 5 stud conversion, adjustable suspension and front mount intercooler, does it need anything else to pass the cert? And where do I get the cert done?

    • johnbrett

      Hi Sam- We have done many Certifications for similar mods. You will need- 1 Driveshaft loops (2), a recent WOF Failsheet, a full wheel-alignment report. If you are in Auckland, phone us to arrange when and where for the Cert. Thanks John

  • kharlos R

    hi there i have a 1998 Nissan skyline R34 i have put my front mount intercooler on but i also cut a hole big enough for the piping below the batterie box i was wondering if i need a cert for this as i read on couple forums of where to do it ??

    but when i came up for a warrent they are not sure if i need a cert or not so the question been is do i need one or not and will it pss where i have cut it ??doesnot look like it will effect anything

    • johnbrett

      Hi Kharlos- I assume it is a Turbo car in the first place. For the WOF (and for LVV) it is not allowed to alter any frontal impact structure. Cutting a hole of say 100 to 150mm dia in the side panel is normally considered not to affect frontal impact, because the standard car has a similar hole on the other side. (Hint- make sure the hole is nice and neat, no bare metal or sharp edges)

  • kharlos R

    hi john thanks for the reply it was a non turbo that had been converted professionally before i brought it but had standard side mount so i cut a hole only big enough to get the pipe in and have little bit of room to play i dont think it will be more the 150MM due to it only been 2.5 inch piping ill tidy up the hole and see what the say anyway if worse comes to worse ill jsut get it repaired

    • johnbrett

      OK Kharlos- a change from non turbo to turbo needs a LVV Cert. The previous owner should have got this done. The WOF people probably missed this. The Nissan plate for the car should say ‘Engine RB20 DE” or “RB25 DE” if it was built as a non turbo, and “DET” if built as turbo. You WILL need a Cert!

  • kharlos R

    is there anyway of telling if the car has been certed as the previous owner claimed he had the cert done as i was interested in the car i didnt really check it out to confirm if it was or not so basically went of they guys word ….went for a warrent today and they didnt say anything about the engine just the intercooler piping they said if i could find someone to say that it was ok to cut the hole as wont effect it to much the will note it in there system for the next wareent and pass my car

    • johnbrett

      If the WOF agent can access the IVCERT screen, they will see if a LVV Cert was done. If it was, the LVV PLATE should be on the car, but possibly was not fitted, removed or something. If you can’t get the IVCERT screen checked, you can phone the LVVTA on 04 2384343. Cheers John

  • Zeb

    Hey,
    Looking at turboing my 2003 350z first registered in Nz 03/06.
    Any issues with;
    *Removal of front intrusion bar to fit the intercooler?
    *Removal of catalytic converters
    *ECU reprogramming
    *Driveshaft loops?

    Just wondering what will need to be done for cert and approximate price. Thanks.

    • johnbrett

      Hi Zeb
      Removal of front intrusion bar is a definite NO.
      Not sure about removal of Cat- could depend on the Certifier
      Engine Mods WILL require driveshaft loops, one for each section, within 50 mm of front universal joint.

      We can’t quote for the Cert, there are NO LVV Certifiers available in Auckland, sorry. I suggest you phone NZTA on 0800 108 809.

      Hope this helps

      John

  • Brook

    Hey. So I’m currently doing up my r32 coupe. I understand that I need a cert for the following
    -Turbo engine swap
    -front and rear camber arms
    -adjustable suspension
    -front mount Intercooler

    Do I need a cert for aftermarket caster, tie rod, traction rod, toe arms. The brand would be “hard race” and if they do require a cert my question is why?? aren’t they factory adjustable for wheel alignments??

    • johnbrett

      Hi Brook
      LVV Certifiers are required to list all modifications and make sure they meet requirements. Imagine, say, if an caster arm was fitted which was for some reason unsafe. The LVV Certifier would be expected to fail it just the same as he would if say an unsafe tyre was fitted.
      Hope this helps
      Regards John

  • Brook

    Thanks for the reply

    Just another question

    If I have adjustable suspension in but with factory wheels

    Will the factory wheels be added to cert plate or not??

    As I would like the option of adding mags to my car later on

    Thanks

  • johnbrett

    Hi Brook- If the wheels were standard when Certified, that’s what the LVV Plate would show. According to the WOF requirements, a new Cert is not required if you later change the wheels- see http://vehicleinspection.nzta.govt.nz/virms/in-service-wof-and-cof and http://vehicleinspection.nzta.govt.nz/virms/in-service-wof-and-cof/general/tyres,-wheels-and-hubs/tyres-and-wheels
    The rules used by the LVVTA are different, and they expect you to get a new LVV Cert if you change wheels.
    If you fit wheels which meet the WOF requirements after the LVV Cert, I don’t think you should have any problem from the WOF people.
    Hope this helps

    Regards

    John

  • brad

    hi john
    quick questions
    have an r32 1990 skyline coupe with standard mpec 4pot big brakes
    following mods:

    rb25det + rb20det manual gearbox (from rb20det)
    intercooler + piping (all cut nicely and small holes) with aftermarket bov fitted on intercooler piping
    rb25det side plenum (greddy copy)
    pod filter
    4″ exhaust (with silencer bolt on tip at the end to reduce noise)
    wastespark coil set

    here is a link of a photo of the engine bay
    http://s31.photobucket.com/user/bax_nz/media/100_2307_zps79b93d25.jpg.html

    which of these mods will need low volume cert and how much are we talking?
    thanks for your time

    • johnbrett

      This sound like a pretty nice conversion.
      Essentially, ALL modifications need to be LVV Certified.
      Exhaust noise- the best approach is to run the vehicle through a WOF inspection to see if they fail it. If they do fail it, then so will the LVV Certifier.
      Cost- now around $670.00 inclusive of GST

      Hope this helps

      Regards

      John

  • brad

    thanks, will be in touch

  • Fraser

    I am looking to buy an r32 gts25 that has been converted to an mspec gtst. It doesn’t have a cert, I know about needing the drive shaft hoops, is there anything else I will need? It also has front mount, 3″ turbo back exhaust and bov etc. The guy will cert it for me if I want (obviously a higher price) but I’m wondering if I should just do it myself. Any advice would be appreciated.

    • johnbrett

      This looks like a very certifiable car. Depending on where you are, it can be difficult to find a LVV Certifier now, as so many have left the system. Prices will be around $600 in Auckland. Certainly you will need two driveshaft loops, but it is best if you get a Certifier out to go over the car to give you a list of what you need to do. Regards

      john

  • alex

    HI John i have fitted a rb20det into a a31 cefiro that had a factory rb20de and have fitted the driveshaft hoops but have been told that i will need a turbo drive shaft can you please confirm this.

    cheers

    • johnbrett

      Hi Alex- Who told you this? Was it a Certifier? There is no rule as such, it is up to the judgement of the Certifier. I personally think that using the turbo drive-shaft is a good idea, it’s what the manufacturer thought was needed.
      Cheers John

  • regans

    hi john how much to cert a datsun 620 ute with air suspension all 4 wheels a vg30de conversion? cheers

    • johnbrett

      Hi Regan
      I am sorry I cannot quote for this, I no longer do LVV Certification
      You will have to find a Certifier prepared to do this

      Regards

      John

  • regans

    dam. whos easy est to get it done?

  • ryan.d

    Hi John

    I have a nissan laurel c33 with rb20det and very basic modifications (adjustable suspension, intercooler etc). I was told by a certifier that i have to have a 5 stud conversion with bigger brakes for him to even look at the car. I have new discs and pads all round and has passed vtnz warrants twice. Have you certified any A31, C33 or s13 etc with a turbo motor and four stud standard brake set up? I realise factory A31 and c33 turbos have a larger disc but i was hoping the DE brakes would be enough. Thanks in advance

    • johnbrett

      Hi Ryan- Yes I have certified many similar conversions. I have found that usually the standard brake set-up will pass the 5 stop requirement that the LVV Certification requires. That said, it should be noted that:
      1 VTNZ have no way of evaluating this, their roller-test does not tell if brakes are wrong for the car-
      e.g might fade, or imbalanced front to rear,etc, and
      2 Nissan models have a range of brakes available, even on the same stud pattern-
      e.g. I have had customers fit bigger brakes still on 4 stud hubs.

      Further, the LVVTA is now making Certification decisions over the Certifier’s head. So, talk to your certifier a bit more, he might have good reason to fail it, or he might have been over-ruled by LVVTA.

      Best wishes
      John

  • jorgi

    Hi john I am about to take my skyline rb25det conversion for a cert but I do not have a pcv valve on the covers. What do I do in this case. Will it still pass

  • Morgan

    Hi mate. I have a 94 r33 skyline gts (factory rb20e) and the previous owner has fitted a rb25de. It passed a vtnz warrant check with no cert. Does that mean I don’t have to get a cert?

    • johnbrett

      No, unfortunately, it needs a Cert. VTNZ must have missed it.
      Cheers

      John

    • johnbrett

      Yep- it needs a Cert. Perhaps you could make a complaint about the faulty warrant- but hey- it’s hard for an inspector to know what’s standard for a particular vehicle. He might not have known to look at the plate that said “RB20DE” or understood that it needed to say “RB25DET”
      Cheers

      John

  • Robert koops

    Hi there john, i have an 04 ford courier im wanting to get certed for no front inner guards as they were cut out to allow for the vehicle to be lowered and also for mags 245/35 20″ to fit and wanting to know if this is able to be certed please…

    • johnbrett

      Hi Robert- I no longer do LVV Certs. There is no LVV standard or rule covering this- the LVVTA would now decide over their desks if this is OK. You should ask them.
      Cheers

      John

  • samir

    Hi John i am wanting to run 15 x 7.0 ET+24 and 15 x 7.5 ET+18 wheels on my factory gts-t which is 5 stud, will i need a cert for spacers as the wheels arent going to go over the bigger brakes without them and will it need a cert for the wheel size being smaller than factory? also i know the chassis will drop with the smaller wheels so im guessing ill need a cert for ride height? any advice ?

    cheers

    • johnbrett

      Hi Samir- You can change the wheels and tyres without a Cert (within the limits of the WOF requirements), but WOULD need a cert for any sort of spacer or adaptor.
      You say that the chassis will drop- but haven’t said what tyres you would fit.
      I can’t understand why you would do this, as a Cert will cost you around $600.00. Wouldn’t it be easier, cheaper, and better to fit some 16’s or 17’s as standard?

  • samir

    am going to run 195/50/15 up front an 195/55/15 rears, fronts will probably be semi slicks, more just for looks and something different to the everyday skyline on 17s/18s but yea it is cheaper to run 17s as i am at the moment

  • chris

    Hi, I am currently in the process of certifying my r32 gts to a 5 stud and rb30det. I failed on a “no engine check light” issue as I have kept the factory ecu (Im emulating a tune into it as i drive so i can alter it with my laptop ie chip tuning) as i stated to my certifier that the cat over temp light is the light that flashes if the ecu throws an error code, however, it isn’t amber but red. He wasnt sold on this and still sent me away with a failed comment. after digging into the manuals I was able to find a section that says the light acts as a ecu fault light, same as an engine check light aswell as many forums stating the same about r32s and 33s(not sure on r34s). My question is, with supported documents and photos of rear of dash etc will this need to be sent to HQ to prove that that light acts as an ECL. Im very confused and surely my certifier will be able to make a decision on the spot? What happens when you have a r32 come through you? Thanks.

    • johnbrett

      Hi Chris
      I know that the engine check light is a requirement now, and sometimes causes problems. I can only suggest that you talk more to your Certifier, and ask him to involve the LVVTA if neccessary.

      Regards

      John

  • Jacob rust

    Hi I’m I have a c33 Nissan laurel I just blew the factory 25de up and want to put a 25det coversion in it.it is all ready certed for hight and wheels spacers &factory engine camber arms what would I have to do to get it to cert standards like do I have to go 5stud bigger brakes bigger wheels all new bushers etc

    • johnbrett

      Hi Jacob- I am unable to advise you at this time. When I was doing LVV Certs, I would have relied on the road test to determine if the brakes met the standard- every similar car I did was fine, so long as the brakes were in good nick, and had decent pads. There is nothing in any LVV Standard about bushes- people replace them just to firm it all up, or because they had the fluid filled bushes that were leaking. Have you found a Certifier who will do it? Cheers John

  • Shamir

    Hi i have a r34 sedan with factory 25det.however the previous owner put a 26dett in it will this need a cert..

    • johnbrett

      Hi Shamir
      Yes it certainly will need a LVV Cert. You will need driveshaft hoops, but brakes should pass without any trouble

      Regards

      John

  • Cody

    Hey, im looking at taking my 1993 r32 gte sedan for a cert in the near future. I currently have put an rb25det in other that drive shaft hoops what els will it need done for cert from your knowledge? Also wanted to get it certed adjustable suspension. Iv been told ill need aftermarket camber arms and caster arms to get out the camber? (Word of mouth not told by a certifyer) also im putting a custom a31 front on it. Any idea if this will be a problem for cert? Because nothing structal needs changed iv got custom r32 guards with the front section of an a31 making it a “cefline”

  • Zac

    Hi I have recently installed coil-overs / adjustable suspension in my ’06 350Z. Before certification I’m going to need aftermarket rear camber arms and rear toe arms to bring the camber/toe back within legal limit. I’m worried that only certain brands will comply with NZ standards and because I’m buying from overseas I was hoping you could help shed some light on this. Thanks in advance.

    • johnbrett

      Hi Zac- there are no “legal limits” for wheel alignment- they just have to make a safe car. Excessive negative camber will be failed, usually at the 1 degree more than manufacturers spec. which happens when lowered too much. Camber and Toe arms- the LVVTA need to approve whatever is fitted now, better you talk to them or to a local LVV Certifier.
      Regards

      John

  • Richard Hollywood

    I have a customer that has a ’74 260z, and I have fitted an XYZ coil over kit, it required weld which was done by a ticketed Marine engineering company, does this need an NDT crack test ?? original struts were factory welded ??
    Thanks Richard

    • johnbrett

      Hi Richard
      I’m sorry I can’t give a reply on this now, all the decisions on items such as this are now made by the LVVTA on a case by case basis. I suggest you phone them. Sorry I can’t help. Regards John

  • Matt ward

    Hey was the deal with driveshalf loops on s14 some say one some say two which is it? They have the hanger in the place and the rear factory loop so should only need one is this right?

    • johnbrett

      Hi Matt
      They need a loop on the FRONT of EACH section of driveshaft- The center hanger bearing does not count as a a driveshaft loop.
      Thanks for your query

      John

  • Randy Re

    Hello,

    I am just wondering if you know of any other chassis that share strut tower bars with C35 Laurels?

    • johnbrett

      Hi Randy
      By strut tower bars I assume you mean the brace across the top. I always thought that the Laurel and the Cefiro were very similar, even the Silvia. Without putting a tape measure across I couldn’t be sure though
      Thanks for your query
      Regards

      John

  • Conor

    Hey there, I have built a turbocharged s15 from a bare shell. I want a cert, but I’m stuck with a few questions. First off, I have a full set of adjustable arms for front and rear and I have heard that these might not pass cert depending on the brand. How can I tell if my arms will pass cert? Also is it alright to cut a hole in the battery tray for intercooler piping? Cheers.

    • johnbrett

      Hi Conor-
      Nice project- nice car. Adjustable arms- I am unable to advise you, as these now are apparently decided at the LVVTA not by the Certifier. Hole in Battery tray- I and other Certifiers allowed this, so long as it was no bigger than necessary, and finished off smoothly.

  • Mitch

    Hey, I have a 180sx witch came out with a ca18det in in, now has a sr20det conversion. Bigger turbo, front mount , 3 inch exhaust, all the basic mod. Have drive shaft hoops to fit. It is already vetted for adjustable suspension and rims. What do I need to do to get the engine certified? Cheers

    • johnbrett

      Hi Mitch- Unfortunately I cannot give you a straight answer, as the LVV system is currently under review by the NZTA, changes are happening, plus most of the LVV Certifiers I could have recommended have now pulled out.
      I have Certed many 180 SX cars modified to SR20DET, and had no problems.
      Sorry I can’t help you any further

      Regards

      John

  • Brook prentice

    Hey john, quick question I have a 96 Nissan laurel 2.8L diesel factory with a rd28 straight 6 and it’s now been changed to a Nissan td27 2.7L 4cyl Diesel engine, mounts are factory td27 with no modification, power difference between engines is 5-10hp, does this require a cert?

  • Ethan Seagar

    Do you need cert for a 20e to a 20de conversion? i couldnt find anything in the lvvta guidelines

  • Clifford Wilson

    Where do you get your brakes from and who does the work for it considering that it is likely that there are no brake kits for your particular cars? I want to know for my own quirky car that I would like to upgrade the brakes for.

    • johnbrett

      Hi Clifford

      I don’t understand your query- I have never been a car modifier, just a Low Volume Vehicle Certifier up until a couple of years ago.
      Your best approach is to performance brake specialists to see what they have available
      Sorry I can’t help any further.

      There is no charge for this free advice, but could I ask that you make a small donation to my ‘Give-a Little’ campaign? This is to cover legal costs for defending myself from Defamation charges made by Mr Johnson of the LVVTA.
      If you did want to, just click though to the Give-a Little page.

  • bryden

    hijohn
    i have a 1988 nissan laurel c33 it was factory RB20E automatic it now has and RB20det and manual gearbox , it has a front mounted intercooler and the bumper support has not been cut but the intercooler piping has tidy holes through body no rough edges , it has brand KW bucket seats on KW brand rails and the seat belt stalks bolt to same bolt as seat mounts too ,it also has 17″x 9.75″ wheels and the 5 stud and bigger 4 pot 2 pot brakes added and adjustable suspension branded BC gold it has 2 driveshaft hoops , do you see any issues with certification ? also do i need a catalytic converter , Thankyou very much

    • johnbrett

      Hi Brydon

      This is a great, classic Nissan conversion, and I have Certified a few! I see no problem with any of the mechanical changes- the front intercooler only has to meet the WOF ‘General safety’ requirements- that is- no sharp bits pointing forward. The Piping holes, you have probably cut a hole in the inner guard panel- that won’t look like structural weakness. BC Gold is good stuff, just make sure it is adjusted well, and not too low, keep the wheel alignment reasonable, not excessive negative camber. Wheels and tyres seem fine, again, don’t do ‘stretched’ tyres, keep them within makers recommendations. As to a Catalytic converter- the LVV standard says:
      2.5(1)
      A modified production low volume vehicle that has undergone an engine conversion, other than one to which 2.5(3) to 2.5(6) applies, is required to have its exhaust gases directed through one or more catalytic converters, if:
      (a) the vehicle was manufactured after 1 January 1990; and
      (b) the vehicle was first registered in New Zealand after 1 May 2010; and
      (c) the retro-fitted engine was originally manufactured in either:
      (i) the United States of America on or after 1 January 1975; or
      (ii) Europe or the United Kingdom on or after 1990; or
      (iii) Japan on or after 1 January 1985; or
      (iv) Australia on or after 1 January 1986.
      NOTE 1: The intention of 2.5(1)(c) is to say that if the engine being used in the engine-swapped low volume vehicle originally had catalytic converters, then ‘cats’ must be fitted to the vehicle being engine-swapped. Engines manufactured before the years specified in 2.5(1)(c) were generally not designed to meet any kind of emission standards, or to be operated with ‘cats’, particularly those engines fitted with carburettors.

      So you WILL need one!

      Seat belt mounting- this has long been a contentious issue, see my article here- http://lowvolumevehicle.co.nz/2012/03/aftermarket-seats/
      At present I think you will need to have a seat-belt anchor point fitted to the tunnel. Go to a seat-belt shop to get this done the approved way.

      Best of luck with getting it Certified, you shouldn’t have any real issues.

      There is no charge for this free advice, but could I ask that you make a small donation to my ‘Give-a Little’ campaign? This is to cover legal costs for defending myself from Defamation charges made by Mr Johnson of the LVVTA.
      If you did want to, just click though to the Give-a Little page.

  • Hayden

    Hi john I have a 94 c34 laurel with a 20det engine and a 20det box in it what drive shaft will i need or do I need to get one modified

    • johnbrett

      Hi Hayden
      There should be no need to custom make or modify a driveshaft.
      You should be able to source a stock driveshaft to fit, ideally one from the same or higher output vehicle. You should have a good read of the LVV Standard for Engine changes, it has been extensively revised. You may not need driveshaft loops if you fit a driveshaft which matches the engine you are fitting.

      Hope this information helps
      Best of luck with getting it Certified, you shouldn’t have any real issues.

      There is no charge for this free advice, but could I ask that you make a small donation to my ‘Give-a Little’ campaign? This is to cover legal costs for defending myself from Defamation charges made by Mr Johnson of the LVVTA.
      If you did want to, just click though to the Give-a Little page.

  • Joshua Percy

    Hi there, I have a 94 R33 coupe which came with a factory RB25DE Manual, but I swapped the 25DE with a 20DET because I blew it up, with no mods other than some silicone piping and a standard 25DET intercooler mounted under the bonnet with a air scoop attatched above it, is a cert needed for this? no other mods done to the car.

  • Matt

    Hi John,

    I’m thinking about doing the following mods to a 1994 PFL S14 (SR20DET). Which (if any) of the following mods would need a cert?

    -Aftermarket ECU
    -Aftermarket seats – Read your article on seat belt problem. When you talk about the bracket option, Do you mean an L shaped bracket that connects to anchorage above the seat bracket?
    -Aftermarket Front Mounted Intercooler – Neat hole cut in battery tray for piping
    -3″ Exhaust – What are the rules on having a decat?

    Sorry if these have been answered, just want to make sure what I’ve read is correct as there’s a lot of conflicting info. Thanks.

    • johnbrett

      Hi Matt-
      What a great project- only wish there had been S14’s and Skylines when I was younger!
      Yes- you will need a Cert
      The CPU will presumably produce more power
      Installing the Intercooler, the hole by the battery tray will be fine, no structure is affected by that. Just keep it neat.
      Seats- The LVVTA decided that you need to install a new seatbelt anchorage in the floor. You will need to get this done by a seat-belt installer- it’s not really hard but has to be done just so.
      Rules on Cats- The vehicle DOES need to have a Cat, as it would have originally be fitted with one. See the Exhaust Gas Emissions standard under the ‘Documents’ tab on the LVVTA site http://www.lvvta.org.nz/

      Best of luck

      There is no charge for this free advice, but could I ask that you make a small donation to my ‘Give-a Little’ campaign? This is to cover legal costs for defending myself from Defamation charges made by Mr Johnson of the LVVTA.
      If you did want to, just click though to the Give-a Little page.

  • Matt

    Righto, so a cert WILL be needed for all the above mods?

    • johnbrett

      Hi Matt
      Yes a Cert will be needed.
      Hopefully you will find a certifier who is knowledgeable and helpful, and maybe get some good advice thrown in
      Good luck

      John

  • clint

    hey john i have a c33 laurel with a 20det in it spmeone has cut holes for intercooler piping will i still get a cert and also have d2 adjustable suspension an truhart suspension parts where is a good certifier to take it to thanks in advance

    • johnbrett

      Hi Clint-
      Intercooler pipes- usually holes are cut underneath the battery tray, either on one side or both, on these Nissans, the Skyline already has the left hand hole. These should be OK for a Cert. Holes in the Radiator support panel are not good, I hope you have not got holes there. The Cert will also include the suspension, and include the ride height. Camber will have to be within 1/2 degree of spec. You may need to produce evidence about the Truhart suspension components, I don’t know this brand or what parts.
      What area are you in? I can’t recommend any Certifiers in Auckland, they have all left! Best you ask NZTA now!

      There is no charge for this free advice, but could I ask that you make a small donation to my ‘Give-a Little’ campaign? This is to cover legal costs for defending myself from Defamation charges made by Mr Johnson of the LVVTA.
      If you did want to, just click though to the Give-a Little page.

      Hope this helps

      John

  • Adrian

    Hey john
    In the process of finishing my project, just a quick question regarding the requirements for footbrake to handbrake conversion, more or less wondering if it’s ok to drill holes and fix through the tunnel or do I have to weld a mount to the body instead

    • johnbrett

      Hi Adrian
      I guess you have a Laurel or a Cefiro, and have converted it to manual, so need to lose the foot park brake. There is no rule about welding anything, just do a decent job of bolting the lever to the tunnel. I can’t remember if other people have used a reinforcing patch, but not a bad idea anyway.
      Good luck

      John

  • Daniel

    Hi John

    I have a r32 gtr that was imported into the country in 2015, came through compliance fine. Now im being stopped on WOF for braided brake lines, do i need a cert? I was told there was a issue with them being bolt on or something aswell, im not exactly sure.

  • Jordan

    G’day,
    So I have a Nissan Pulsar Gti that has had an SR20VE engine put in, since the engine is very similar tro the original and is still a Nissan, could that pass a WOF?
    Cheers.

    • johnbrett

      Hi Jordan

      I have just checked the VIRM (The WOF guide) and it says about engine modifications which DO NOT require Certification-

      when compared with the OE engine, the replacement engine:
      – is of the same or less cubic capacity, and

      – has equal or less weight, and

      – has the same or less power output, and

      – uses the same fuel (petrol, diesel, LPG, CNG), and

      – uses the same unmodified attachment points and system (ie bolts-in), and

      – uses the same family of block and cylinder head from the same vehicle manufacturer, and

      – is of the same configuration.

      So- if the WOF inspector thinks it is producing more power, he could call for a LVV Cert.

      Hope that helps-

      Regards

      John

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