is it safe to run this amount of boost?

[Mac33R]

Hi guys!

I have a black 1996 Nissan Skylien GTS-T.. i have recently fitted a boost controller on it and without realising boosted it to 15psi.. the problem is, i heard it is too much for the car.. i have the following mods! can u guys (with skylines or any knowledge of them) tell me what would be the safest boost to run...

i have fitted
Apexi front mount intercooler
Apexi 2.5inch Exhaust
Apexi BOV
Apexi Suspension
Quick Shift gear box
Racing airfilter
boost controller

ive turned the boost down to 10, BUT WHAT IS THE SAFEST TO RUN WITH THESE MODS.... take in mind i havent touched the injectors, turbo or ECU..........

????

[Nemesis]

10 or 11 is a good safe number. No real chance of detonation or doing harm to the turbo. My old 25t ran 11psi on a stock cooler, but that was over here in NZ where it is a bit cooler.....

[Mac33R]

thanks for that anyone else got any ideas?? is there anymore 1996 R33 owners here that have boosted their cars??

[RazorGTR]

What was just said is it.

I know Nemesis personally. He's owned one for quite a while. Not to mention he also knows quite a number of people such as my self involved with Skylines, tuning, and such.

[Nemesis]

Originally posted by RazorGTR
What was just said is it.

I know Nemesis personally. He's owned one for quite a while. Not to mention he also knows quite a number of people such as my self involved with Skylines, tuning, and such.

Aww, shucks there Razor.......:sun:

Mac, I know of a number of 25t's around the area I am in, plus others in NZ and OZ. The general consensus seems to be about 11 psi tops until work like pistons and fuel are done.

Taken from Skylinesdownunder
I've heard that more in the region of 12-14 PSI is the go with the stock turbo if you don't want to massively reduce the life of your turbo. The turbo that the R33 uses is of the ceramic type and they just don't like the levels of boost pressure to be too high...

Don't be too quick to rush out and follow all they say there. There are a few that do know, and others that aren't too sure. If your car, being a 96, is the spec 2, it has a plastic compressor wheel on the turbo, not a ceramic. The bonus of this is that the plastic wheel is not bonded to the shaft, it is bolted. I have heard rumours that the spec2 turbo's are good for around 16psi constant, but you would need a lot more work done on the car before that is an option. What type of intake do you have??? At the end of the day, the choice is yours. You can run higher boost if you want to, but I don't think things will last very long at all.

[Mac33R]

Thanks guys its not that i didnt believe u, its just i wanted to see what other people thought

There is also one other problem guys.. when i first installed the boost controller, when i got over 5rpm the boost would spiuke to 15psi!!! then i disconnected this thing above the airfilter and now it runs fine/.... do u guys know what the problem may of been??


phil

[dannyvd]

My mate has a r33 running about 10psi he has had no probs with it i think 10 would be the safest bet

[Forsteen]

Just remember a RB20 can run tops at 1 bar = 14.5 psi. The RB25 can't run at that.

[Gonthrax]

I agree, 10 or 11 seems to be the safe number I hear on a stock engine. Now I might feel safe w/ 11.5 to 12 or so w/ injectors and a fuel pressure regulator. But be sure you have all the insturmentation to monitor whats going on if you decide to do that. No need to blow, or decrease the life span, of an engine/turbo just for a few more horses.

[RazorGTR]

And that concludes this thread.

Nice work guys