hi
i am runnin a SCed GSR, and at dynoday, at about 5-6k my boost went past 10 psi into like 11-12...and at 7-8k it tapered off to eventually like 5 psi at 9....anyone know why? before, when i had my car tuned (i had messed w FP settings in between, but i dont see why that would affect boost), boost was consistent 9-10 all the way to 8500...i'm running a 9 psi stepper on my car with hondata and 440 injectors. what gives?

 

boost leak?
honestley i dont know
i stay away from the JSRC asschargers.

 

I think you have other issues to work out besides boost loss. First, why are you seeing 12psi if you only have the 9psi stepper pulley? Also, how are you getting your gs-r to rev to 9000rpm without grenading? Dyno charts would help us diagnose what's going on.

 

belt slippage will cause boost drop but you can usually hear it

 

Not necessarily. REALLY BAD slippage will be audible, but for the most part you'll have to go by your boost gauge and watch for a noticeable "stepping down" of boost while approaching higher RPM.

Tighten up the belts a little, and watch the gauge on the street.

 

not sure about the boost going past 10...i know 10 is common tho...umm...i have a built head...it was also tund by DSR with hondata...dont worry bout my motor blowing up haha...i'm not crazy...

 

well...the boost tapering off is consistent thru all gears...at around the same rpm...so is it belts or manifold leak?

 

Its either belt tension, or your belt simply may need replacing.

 

hmm tightened the belt up prety good... still same symptoms...could it be boost leak? or...need new belt, i mean from visual inspection the belt seems ok to me after all i've only had the belts for about 5-6k miles

 

sometimes, with cheaper belts, they will stretch even with proper belt tension. Replace the belt, it's likely not a boost leak

 

worse case senario...compressor blades chipped or damaged


[Modified by MiraiZ, 9:26 PM 9/5/2002]