Boost on stock GTR

[marchGTR]

Hi all,

I have just bought myself a bog stock R33 GTR(purple!) and was wondering if its OK to remove the boost restrictor even with a stock exhaust?

I will get a new exhaust in the future, but tempted to remove the restrictor in the meantime??

I have looked through previous threads but havent found the answer to this question

[400kwgtr]

removing the restrictor will give you about 15psi, which is around double the standard boost. Doing this with a standard exhaust is fine, you wont get as much power as you would with a 3 inch system. It will be a big improvement and the car will kick ass. To be safe you should get a new boost guage and monitor the exact boost the car is producing or you might end up with a little ceramic turbo wheel stuck in your cat converter...

[marchGTR]

removing the restrictor will give you about 15psi, which is around double the standard boost. Doing this with a standard exhaust is fine, you wont get as much power as you would with a 3 inch system. It will be a big improvement and the car will kick ass. To be safe you should get a new boost guage and monitor the exact boost the car is producing or you might end up with a little ceramic turbo wheel stuck in your cat converter...

Thanks for your advice..ill get a boost guage and take it from there.

[CR34TION]

From what i know, a stock GTR runs 11psi boost. Removing the restrictor, it will run at 14psi. That's what I've done with mine, but i have a cat back exhaust. I don't think there is any harm.

[Penfold]

r33 gtr is 0.84 bar or a bit over 11 psi, when u remove the restrictor it runs at about 0.95 bar or 13.5 psi. So its an OK increase but nothing too drastic (most people are happy running the stock turbos up to 1 bar).

[Ronin 09]

Sorry to dig up a dead thread, but I have just noticed that my R32 gtr std boost gauge goes over the +7 std reading when boosting.

It has a cat-back (soon to be full system), and I can't feel the boost restrictor around the yellow dotted line (removed?)...

My question is, is this safe turbo wise, and, what equivalent PSI or bar should I expect? I will try and hook into a boost gauge this weekend...

[RBVS]

when you say remove the restrictor what is that in relation two. If its a restrictor in the vacum line to the actulator removing it would make you run less boost, as more air is going to hit the actulator sooner thier for opening the wast gate sooner??

or is there some kind of ecu restrictor?

Unless the restrictor is in line with T peace and soliniode, then removing it would allow the soliniod to bleed more air, in turn raising the boost. Can somone clear this up for me?

[Ronin 09]

I'm talking about the brass restrictor in a vac line on the driver's side of the car - it is highlighted by a yellow line around the vac line...

anyone want to tell me what is the PSI if the factory gauge is reading over +7 ??

dangerous or not?

[Drift-King]

17psi .im not kidding. are you sure you have stock turbines ? you must have steel wheeled ones.

[wrxhoon]

7 in stock boost gauge is about 14 psi , it all depends on how much over 7 it goes if safe or not , ceramic turbines up to 14 is ok anymore its a bit risky , steel turbine is fine .

[Ronin 09]

Ooh crap - they are stockers - at least thats what I thought.

I bought it (apparently) stock, only change is I've bolted up a cat back.

I'm sure the restrictor is not there - I'll go take a pic in a sec...

OK i can't feel any brass thingy in the vac line around the yellow line, but the buldge between the clamp band and the yellow line - is this where the restrictor is?

Cheers

[Gav]

The GTR factory gauge reads pressure in mm of mercury x 100.

7 boost gauge = 700mm Hg = 0.92 bar = 13.53 psi

trouble is that the boost gauge isn't that accurate, so the 7 could really be 7.5 or 8.

[Drift-King]

Gav, dont forget he said it goes past 7.

[Ronin 09]

hey Drift-King, is that bump the restrictor, or is it smaller than that?

[Drift-King]

Hey Ronin i seen your car driving around footscray sometimes did you ever see a R32 GTSt going sideways infront of you one day ? black one.

as for the boost restricter, i personally think you have steel wheel turbines and yes the boost restricter is out.

[Ronin 09]

not sure if that is me... possibly - i live east and work in the city

As for the turbos, 99.99% sure is stock ceramic wheels... maybe the gauge is out.

can anyone confirm what the restrictor looks like, or has a pic of it?