R33 Boost

[kikka]

Gday guys.

i have just bought a r33 skyline.

it runs a standard turbo and motor as i know it.

So my question is how much bost can I run as standared anbd flf the shit out of it with out the engine failing??

I have been told that 10 psi is the max?

Any help would be great..

Thanks

Kikka

[mad082]

the answer to this varies. for starters, how much you can run and how much you should run are 2 different things.

what mods does the car have? does it have an after market exhaust? does it have an aftermarket intercooler? if yes to both then anything up to about 12psi is fine, although the ecu may start to throw a tantrum around 12psi. if no to the intercooler but yes to the exhaust then keep it to about 10psi. if stock exhaust then don't bother at all, just do the high mode boost mod to make it run 7psi all the time rather than the stock 5psi below 4500rpm and 7psi above 4500rpm.

also engine failing isn't an issue. the turbo failing on the other hand is the issue. the stock turbo runs a ceramic exhaust wheel and this gets weakened by excess heat (which is why i said not to raise the boost on a stock exhaust, as the restrictive exhaust causes the turbo to run hotter). generally 12psi is considered the upper level of what is safe. some people will tell you that the turbo won't make any more power beyond 12psi but this is false. it will still increase in power up past 16psi, but it would be a ticking time bomb. also the stock ecu won't let you run much past 12 or 13psi before it goes into excess airflow protection mode (more commonly known as rich and retard, as it richens up the mixture and retards the timing).

[t4t4nk4]

and how is the boost mod performed as i think that might be my lag problem, everything is fine on the car but at exactly 4500 it drops down then peaks back up. super f...ing annoying,

[t4t4nk4]

and how is the boost mod performed as i think that might be my lag problem, everything is fine on the car but at exactly 4500 it drops down then peaks back up. super f...ing annoying,

nevermind the coil packs fixed it.. i already did it.

[kikka]

Thanks very much for ur advice.