How do I de-restrict my GTR?

[project mu]

I have just imported an R33 GTR V-Spec. How do I get the 1 bar of boost instead of the 0.6 bar standard? I know I need to find a tube near the passenger side strut with yellow tape but I cant find it.

Any help inc. photos apriciated.

TA...

[gtr mart]

as well as just increasing boost you need to make sure your fuelling and timing is set accordingly.

The norm would be to fit an aftermarket '1 bar' chip - available from the likes of Abbey / RK / and the rest I imagine. I have a mines 1 bar chip on mine

People would normally also fit an aftermarket boost controller instead of say a bleed valve to ensure the boost is maintained and held properly.

Not too many people use bleed valves on skylines, not sure what your planning to do...?

Re the hose your looking for - I dont know, but would guess it will be in one of two locations. By the boost solenoid which is on the front OS wheel arch, or by the turbos / actualtors, which are mounted on the ns of the engine and the actuators are attached to the turbos.

hope this helps.

[Silver R33 GTR]

quite possibly it is by the o/s/f of the engine between the washer bottel and the rad, well thats where mine is. really long pipe about 12mm thick with a yellow paint band. mine was pointed out to me last week.

robin.

[DAN00H]

project mu - mate, what you are after is the stock boost controller. it is located on the drivers side shock tower, just near the inlet plenum. the brass restrictor is located where the yellow band is (in the line that is going into the side of the solenoid, not the one pointing towards the drivers side headlight!)

whip this out and you will have 1 bar. you do not need a chip, or bleed valve or anything else if this is what you are after. besides - it is free!!!

the next things you need ot look at are the exhaust ( go to either 3 inch or 3 1/2 - 3 3/4 inch and the air filter/s.

by removing the restrictor, having a decent filter/s andexhaust you should see 300hp at the rear wheels.

NOTE: don't fit any boost controller and run more than 1 bar on the stock turbos, otherwise they will go bang.

[Abbey M/S]

running without a restrictor is way over 1.0 bar . POSSIBLY your car will run over 1.3 bar this is not good for the stock ceramic turbo,s.

Also the standrad ECU over fuels terrible when running 1.0 bar boost , either find a EPROM up-grade or run a Power FC/HKS f-con SZ ECU map to suit on your car will like you lots.

Mark

[project mu]

OK Thanks a lot for the reply's

I already have a full Apexi exhaust fitted to the car and pod air filters. It also has a Power FC fitted. I just cant drive it at the moment as I am still waiting for compliance to come through! (about 10 days). We think the car may have had an aftermarket boost controller fitted a some point but we think the previous owner removed it. I read in a magazine somewhere that you could remove this restrictor in the stock boost controller for a perfectly safe 0.6bar to 1bar upgrade. I know ceramic turbos should be run a <1.1bar.
Why should I spend money on an expensive electronic boost controller with multifunctions I don't require? I just want 1.0bar all the time. Can I just fit the Apexi boost controller for the power FC? or should I consider other options?

Your views appriciated

[gtr mart]

an aftermarket boost controller is a safe and consistent way to run increased boost.

When my car was forst set to one bar, it was done with a restrictor being put in one of the tubes. This didnt give 1 bar exactly and never gave me the option to run lower boost.

Since having this done I hvave had an aftermarket boost controller put on my car to enable me to run standardandn 1 bar boost.

Do what you want. Be wary of just removing the resricter - abbey motorsport almost certainly know more than anyone who has posted on this thread - if you do proceed in good faith that removing that restrictor will only give 1 bar (which I doubt) - then when you take it out, make sure you are v carful when checking what boost it makes.

Make sure you get the car mapped too.

[DAN00H]

project mu - if it still has the orginal restrictor (which is highly unlikely...) then just pull it out. just about every R32 GTR I know of has done thois, or had it done and not suffered any issues (ie - overboost. this is considered madatory by all here in Australia

if it is there, just pull it out and enjoy 14.9psi yes it is safe, again, I know of no R32 GTR that has suffered issues running the car this way.

I have seen the ceramic turbine fail when being used with either a bleed valve (yuck) or EBC and pushing them beyond 1 bar (~15psi).

it sounds like your car is very much like mine, but you have the PFC installed. with similar mods abet stock ECU, I made 230rwkw (or 308rwhp). I imagine you should make at least 320 seeing as you have the PFC.

Mark (Abby) - while I respect your wisdom and experience, this is a common upgrade which is free. you can get overboost (spiking) with EBC's...... I'm not having a go, just pointing out that this is a worthwhile mod.

I ran my gtr for almost 12 months like this (and I imagine it was like this for years in japan LOL I now have a Blitz iD III as I'm installing GT2530's shortly and want the option to run more boost than 1 bar.

gtr mart - I'm sure mark doesn't need you kissing his backside by saying the rest of us are dumb and have no idea about our cars. Not a constructive comment there mate.....

[gtr mart]

Originally Posted by danooh

gtr mart - I'm sure mark doesn't need you kissing his backside by saying the rest of us are dumb and have no idea about our cars. Not a constructive comment there mate.....

Nice one mate. I come on here and give advice where possible - same as you. If you read what i wrote, I didnt slander you or anyone else, I merely stated that Abbey motorsport (one of the leading skyline specialists in the UK) are more than likely to know anyone else on this thread.

Originally Posted by gtr mart

Do what you want. Be wary of just removing the resricter - abbey motorsport almost certainly know more than anyone who has posted on this thread - if you do proceed in good faith that removing that restrictor will only give 1 bar (which I doubt) - then when you take it out, make sure you are v carful when checking what boost it makes.

I dont know who you are - you were instantly negative about my post though (re the aftermarket chip)

Originally Posted by danooh

whip this out and you will have 1 bar. you do not need a chip, or bleed valve or anything else if this is what you are after. besides - it is free!!!

With regards to licking anyones ass - I dont think so.

Read what I wrote - I did advise the guy that if he did follow your advice, be very careful about checking what boost it will run. I didnt say your were wrong, just that I doubted you.

[FULLY SIC]

ONYEA DANOOH!!
I got my liner with the restrictor removed and it has hammered around
for ages and i suspect for a long time before me.
Why would nissan fit a simple brass plug with a hole in it,in a hose with a yellow band on it,that can be easly removed by the most unmechanical of owners and give 1 bar boost if it wasent safe to do so? The factory GTR ecu is mapped to run this level of boost,unlike the factory
GTST ecu.It won't run 1bar(even if a bleed valve is fitted) and there is no easy brass plug to remove or marked hose. It requires a rechip or change of ecu.
just my 2 psi.
FREE THE BOOST!!

[terribleone]

interesting post, i have also read that you can remove the restrictor for safe 1 bar boost.

Can anyone else confirm what Abbey and Mart are saying??

What gain has Mark at Abbey got by giving wrong advice?

Can any other skyline garages confirm that it gives well over 1 bar?

Who else has removed this restrictor?

Can it go back in if boost is unstable or too high?

Why was it there in the first place??

[Abbey M/S]

When we used to do the Eprom up-grades for the BNR32 and BCNR33 GTR,s we used to drill the restrictor out to between 2.7mm and 3.1 mm to get 1 bar of boost.

If you remove the restrictor completely the next restriction that controls the boost is the standard boost control valve and from memeory this is around 5 to 6 mm We know from many hourson the dyno removing the restictor will allow the car to produce more than 1.0 bar of boost .

If any wants to lend us a car we will run it on the dyno to do a test to sort this thread out.

We are not biased to try and sell equipment just want you people to have fun in your cars not blowing motors up.

[Hugh Keir]

I can confirm what Mark is telling you is correct as I have also played around with different jet sizes to obtain the boost setting.

Removing the jet completely will give you uncontrolled boost and will give you more than 1 bar of boost anyone that tells you different is talking b0$$0cks.

There is no doubt that a restrictor jet is a cheap way of controlling boost, however it reacts differently when the engine is hot to when it is cold. If you are not at the boost limit of your turbos this may not be an issue for you.

If you are at the boost limit of your turbos, fit an electronic boost controller. For Power FC users, Apexi makes one that plugs into the ECU and is IMHO the best way to go.

[terribleone]

That answers that then for me.

Thanks Hugh, Abbey.

[DAN00H]

Originally Posted by gtr mart

Nice one mate. I come on here and give advice where possible - same as you. If you read what i wrote, I didnt slander you or anyone else, I merely stated that Abbey motorsport (one of the leading skyline specialists in the UK) are more than likely to know anyone else on this thread.



I dont know who you are - you were instantly negative about my post though (re the aftermarket chip)



With regards to licking anyones ass - I dont think so.

Read what I wrote - I did advise the guy that if he did follow your advice, be very careful about checking what boost it will run. I didnt say your were wrong, just that I doubted you.

gtr mart - don't take it to heart - we all get a flamming every now an again - differences of opinion and all that...