How Much Boost Are You Running On Your Stock Gtr Turbos?

[amosite]

Select your poll and if your running more then 1 Bar, list your set up as well as boost and power!

Im trying to get an idea of how much the stock turbo's can take from people who can 100% confirm that their turbos are stock ceramic turbo's

Most people say 1 bar is it but I have seen cars run more without problems on bonefied ceramic turbo's.

I have also seen cars with less then 14 psi damage ceramic's but is more likely due to shagged turbo's.

I know the R34 GTR turbo's, while being ceramic BB will take 17 psi and will make near 400 to the rear wheels.

A good friend is going to put a tune into the car and said he will run 17 psi as long as its got a good EBC.

I double checked with him 3 times and he has assued me he has done it many times. If it shits the stock turbo's- no big deal, I will get my brother to put a GT3040R on it

[R31Nismoid]

Stock R34 GTR turbos will make 300rwkw on 17psi.

I dont think so tim.

Put it this way. Dial up 15-16psi. Take the car to the track

See what happens... or to save the issue, i'll tell you. Dead turbo.

Dead turbo = (most of the time) dead motor.

Its not that people "cant" run 17-11ty billion psi. Its that most people arent silly enough to do so.

There are limited people that do, and sometimes they are ok, more often than not you see them post up 6 months later with a dead piston in 5 or 6 after thier turbo died.

Essentially, its your own gamble.

Age & conditon play a major part. You dont know if the car was serviced well before it came to your hands.

You dont know what boost levels, what activities etc. All things that can lead to a very expensive lesson

So its really luck of the draw, most people err on the side of caution, and rightly so. Not everyone likes to engage in a 5 figure rebuild

[GeeTR]

Its like standing with your mates at the local go-kart track, edible undies on your head, helmet clutched, hopping from foot to foot checking each kart as is pulls into the pits, “which one has brakes that work and the least shagged single thumper”

Theres too many factors to consider regarding the history and previous owners of the car.

Had a few examples of ppl running a bar and a half… congrats, I figure it’s a measure of time before selling a kidney becomes choice

[Mr. Keets]

"Its like standing with your mates at the local go-kart track, edible undies on your head, helmet clutched, hopping from foot to foot checking each kart as is pulls into the pits, “which one has brakes that work and the least shagged single thumper”...."

Dont mess with fate. Save your self the grief and change them before they fail

[amosite]

Hmm,

Put a boost gauge on the car this morning, 16.5 psi with no olive.

Put another one on, the same, 16.5 Psi and has been so for over a year

Why wouldnt R34 turbo's make 300 rw kw? Have you seen otherwise?

They dont have the same thrust set up as a bushed turbo and are more reliable on higher boost. They arent that much smaller then 34 N1's.

I understand its like anything, someone who runs 17 psi on a car without knowing that the fuel pump/system/tune they will blow the engine. Heck you could blow your stock engine at 1 Bar if it had an damaged air flow meter.

Im talking about people who have taken the steps to ensure that the engine is running properly.

As for 1.5 bar, thats just stupidity

[Roy]

Snowman was running a bit over 1 bar on his R34 GTR and he was makign something like 280rwkws. His didnt die after several track days????

[saliya]

R32 GTR, stock turbos/dumps, 5" K&N pod, PFC + BCK, 4" straight-through exhaust (FS, see below).

Made 253awkw/550nM on a slipping clutch @ 18psi, tuned at CRD. 12.5 @ 111 on a G-tech.

No dramas for 18 months before I added mufflers (including half-a-dozen full track days @ Wakefield).

Added mufflers to bring noise down from 105dB to 95dB, lasted another 3 months (inc. 1 track day)

before boost started to fall off (down to 15psi on same duty cycle) and then shortly after that blew the

exhaust wheel off the front turbo. Inspected cyls 1-3; no bits of exhaust wheel that we could find.

Make of this what you will Personally, I think the 18psi was OK _without_ the mufflers; but that with

the added backpressure things just got hotter and nastier and it all became too big an ask. Perhaps

even without the mufflers things would have blown when they did - nobody knows. And 4" with

no muffling isn't an option for pretty much everyone.

18 months at 18psi was fine by me. It all comes down to whether you're prepared to _chance_

blowing stuff in exchange for more welly. Every time you wind something up in a car, you will

either find the limit of it or another related system - cars are designed as a package.

Regards,

Saliya

[R31Nismoid]

Snowman was running a bit over 1 bar on his R34 GTR and he was makign something like 280rwkws. His didnt die after several track days????

And they went onto Geoffs Twin Turbo RB25 and died @ 7psi and cost him a motor

[Adriano]

one of my mates was running 19psi, and guess what he blew 3 in 6 months, the 3rd stuffed the motor.

[gtr13]

my 34 GTR runs 260awkw roughly around the 285 - 290rwkw @ 1 bar have not had any dramas yet but have not done any sort of circuit work with it though, but have taken it down the strip boost did creep up to 1.1 bar higher in the rev range

Edited November 11, 2006 by gtr13

[amosite]

If you have a V Spec II you have 403 turbo's (N1's) and will be easily able to run more boost/power

[N I B]

18PSI long term on an R32 GTR with R33 GTR turbos inc track and drag days running 119.35mph over 1/4, bout to change them but their going strong.Lucky i spose.

[Roy]

And they went onto Geoffs Twin Turbo RB25 and died @ 7psi and cost him a motor

..actually the turbs are off the car and they are fine...something else went bang

[wrxhoon]

If you have a V Spec II you have 403 turbo's (N1's) and will be easily able to run more boost/power

Who told you that? V-spec II has the same ceramic turbos as all R34 Gtrs, only N1's and NUR specs have steel wheel turbos .

[gtr13]

If you have a V Spec II you have 403 turbo's (N1's) and will be easily able to run more boost/power

The only N1 parts on a V-spec II from the factory are the rear disc rotors as wrxhoon has said the turbos are the same as every other 34 GTR

[wrxhoon]

The only N1 parts on a V-spec II from the factory are the rear disc rotors as wrxhoon has said the turbos are the same as every other 34 GTR

I think you will find that all serries II 34 GTRs have the same brake rotors not just V-spec IIs.

[gtr13]

Yes true, but we were only talking V-spec II's because everyone knows they are better then M-spec's

[wrxhoon]

Yes true, but we were only talking V-spec II's because everyone knows they are better then M-spec's

And why are v-spec II's better than M-specs? Do you know the difference ?

[amosite]

Can you check the part number on your turbo's?

If you have sold them, ask the person you sold them to.

I am under the understanding that:

R32 V Spec II had N1's

R33 V Spec didnt

R34 V Spec didnt

R34 V Spec II has N1's (401, 402 or 403's)

The 34 N1 has upgraded pumps and cams, apart from that the engine is the same as the 34 V spec II...

[wrxhoon]

Can you check the part number on your turbo's?

If you have sold them, ask the person you sold them to.

I am under the understanding that:

R32 V Spec II had N1's

R33 V Spec didnt

R34 V Spec didnt

R34 V Spec II has N1's (401, 402 or 403's)

The 34 N1 has upgraded pumps and cams, apart from that the engine is the same as the 34 V spec II...

Refer to post 14 by me, thats correct, you dont need to check numbers , if you have the turbos off the car put a pic up showing the exhaust side and i'll tell you what they are .

Not sure if R32 V-spec II's had N1 turbos but i don't think they did, maybe someone that has a 32 V-spec II can confirm this .

As for the 33's you are correct, they all had ceramic , only the N1 cars had the steel wheel turbos .

One more thing there are about 4 different R34 GTR N1 turbos ...

Edited November 12, 2006 by wrxhoon