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Stock Turbo Capabilities.

Taso84

By Taso84,
in Engines & Forced Induction

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Taso84 Mentor

Taso84

Posted
Posted

Got some questions that afta doing some research, i havent been able to come up with conclusive answers, so id like to ask:

For an r33 GTS-t stock turbo,

1) when pple say the stock turbo shouldnt be pushed past 14psi, do they mean the boost made at the turbo or are they refering to the boost at the manifold? Im asking coz if i have u 2psi drop across the cooler piping, then saying that the stock turbo is good for 14, really means istd good for 16 if ur measuring it from the manifold.

2) If a turbo has a life of 60,000km, wouldnt boosting it to say 10 -12psi (from 7) mean thats its life is shortened by at least a 1/3? If ur buying a 2nd hand car, the turbo prob has less than 30,000 left, so boosting it could mean u have 20,000kms or less? Since in a typical year u would drive 15 -20,000kms how can ppl say 10 - 12psi is reliable when the turbo will most likely blow within a year and a half?

3) Is it normal for a r33 GTS-t to pull unbelievably hard in 1st gear, very good in 2nd, but pretty poorly in third gear, even up to redline? Is this signs of the turbo maxing out?

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Adriano Grand Master

Adriano

Posted
Posted

cummon, this has been discussed about 1,000,000 times here, anything over 12 psi and you are gambling, regardless of age. Anyway you dont really get any more power turning it up above that. Run 10-11 psi and sort out the rest of your system first(exhaust, i/c, management) and then if you want more power, get a highflow.

BHDave Grand Master

BHDave

Posted
Posted
Got some questions that afta doing some research, i havent been able to come up with conclusive answers, so id like to ask:

For an r33 GTS-t stock turbo,

1) when pple say the stock turbo shouldnt be pushed past 14psi, do they mean the boost made at the turbo or are they refering to the boost at the manifold? Im asking coz if i have u 2psi drop across the cooler piping, then saying that the stock turbo is good for 14, really means istd good for 16 if ur measuring it from the manifold.

2) If a turbo has a life of 60,000km, wouldnt boosting it to say 10 -12psi (from 7) mean thats its life is shortened by at least a 1/3? If ur buying a 2nd hand car, the turbo prob has less than 30,000 left, so boosting it could mean u have 20,000kms or less? Since in a typical year u would drive 15 -20,000kms how can ppl say 10 - 12psi is reliable when the turbo will most likely blow within a year and a half?

3) Is it normal for a r33 GTS-t to pull unbelievably hard in 1st gear, very good in 2nd, but pretty poorly in third gear, even up to redline? Is this signs of the turbo maxing out?

1) Typically people are referring to boost at the plenum as thats where most of us are getting our boost signal from. It would have to be a pretty ordinary intercooler and piping to have a pressure drop of more than .5 psi at the sort of power we are talking about here. 12-14psi is what most people will say is a good idea to maintain any sort of reasonable lifespan.

2) Turbo life is a lot longer than 60,000km's these days, some of the current crop of factory bb turbos will see well over that if left alone and fed good clean oil. I'd be surprised to discover more than a handful of people who have had to replace a stock turbo before 100k as it's just gotten old rather than it's been over boosted or the engine has been maintained poorly. My car had 100k on it when i bought it and the turbo lasted another 60k. I started modding almost immediately after buying it and had boost up to 16psi on occassion. It didn't spit the wheel out the exhaust, it just got noisey in the end so i replaced it.

3) Couldn't tell you, but consider a stock 33 gtst is up near 1.4 tonnes and makes about 130rwkw give or take. It's not going to accelerate particularly hard once your out of the first couple of gears. Add an intercooler, exhaust and boost with say an safc and get your self up around 180-190rwkw and it's a different story.

R33GOD Grand Master

R33GOD

Posted
Posted
Im running 13psi at the moment.That is as far as im going with it.Im getting a VG highflow soon so im not that worried.

heck no i wouldnt run the stock turbo past 12.5 psi as the series2 skylines turbochargers are pretty crappy as i blew mine at 12.5 psi... that and i had a few boost spikes to 13.5 psi which prolly blew it up lol

hiflow time! >_<

MANWHORE Grand Master

MANWHORE

Posted
Posted

It's different for everyone. Some people run like 18 psi and they don't blow.

Others run 10 psi and they blow. It's all luck of the draw.

We were muckinng around running an rb25 turbo at 16 psi on an rb20. It gets thrashed every few days, and it's still going strong. Been a while too

sapsR33 Explorer

sapsR33

Posted
Posted

hey guys

my series 2 has done 150k and stil on the stock turbo, it was dynoed just 2 weeks ago and made 193rwkw on 10psi and 199.3 on 12psi. ive only ever had it on 12psi maybe 6 times and it goes great. basically what im trying to say is this, with the right components in your car it will comfortably handle 12psi and deliver great resuls and will last you as mine has me.

i suggest you invest in an ebc to stop the spiking and keep your car healthy as other ppl have said its not just the boost that matters, but the entire setup.

  • 7 months later...
sl33py Mentor

sl33py

Posted
Posted

By the way, who manufactured the stock turbo on the R33s? A mate asked, and I know it, but I'm drawing a blank at the moment. It's some really boring company name like Hitachi or some bl00dy thing, but I don't remember!

Anyone?

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