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04-12-2009
Hi there folks, im new in this forum.
Im looking for some help in to my 1997 grand prix GTP i have a few modz, PCM reprogram, 3.25 pulley, resently engine overhaul, modded intake, modded SC.
But my problem its that my supercharger only trows 5 psi of the 10 psi, that the 3.25 pulley produces.
Can anyone help me with my problem? i dont know what happened.
Thanks a lot
04-12-2009
3.25 is too small of a pulley. what is your complete mod list?
04-12-2009
umm yea.... a 3.4 will give you 10 psi lol
04-12-2009
X2 on the mod list...your car is probably slower than a 3.4" or 3.5" pullied car.
You are most likely knocking and that is why you're not boosting right...
04-13-2009
Originally Posted by bluegtp91
may I change to a 3.4 or 3.5 pulley?
I read at zzperformance that a 3.25 pulley its good for a stock or sligthly modded GTP
and how i fix the knocking to be usefull the 3.25 pulley
04-13-2009
you must of misread cause thats def wrong 3.5 is for slightly modded cars
04-13-2009
how do you not boost "right"? you put the pedal down and it boosts no matter what pulley you have. it just boosts more with a smaller pulley.
if it is leaking off 5 pounds of boost i say your BBV is bad, but i also agree with everyone else that the pulley is too small for your mods. you need a 3.5.
04-14-2009
And how should i know if the BBV its working fine?
04-13-2009
You need a lot more mods to run a 3.25. You're not even safe to run a 3.4.
04-13-2009
Straight off ZZP:
97-03 Grand Prix & 04+ supercharged Impala & Monte Carlo SS
3.5 pulley totally stock car
3.4 pulley Colder Tstat & spark plugs, downpipe, Cold air intake (still could have KR)
3.3 pulley all of the above plus a VS cam, SS intercooler, or headers
3.2 pulley 3.4 mods and a XP cam
3.0 pulley 3.4 mods and a fullsize intercooler or an SS ic and a VS cam.
Anything smaller than a 3.0 pulley will require a camshaft, headers, intercooler & injectors
04-13-2009
You fix the knock by putting a bigger pulley on. Probably a 3.8"
04-13-2009
wow!! i would put the stock pulley back on asap!
04-13-2009
Ok i'll try puting a 3.5, whats the original size of pulley? 3.6?
04-13-2009
3.8
04-13-2009
Ok guys, tnks a lot, i will notify you when i make the change and what happened.
04-13-2009
The PCM is probably blowing boost through the bypass solenoid because of how much boost and knock it's seeing.
04-13-2009
...but the PCM doesnt do that...
it limits boost on torque management and traction control...that's it.
04-13-2009
It also does it to protect the cat should it detect a condition that excess fuel is being dumped. I'm staring at the table that controls it right now.
04-13-2009
guess ive never ran that rich before..
04-14-2009
you might be thinking that your not seeing all your boost because your cars not as fast as you'd want it to be. Your best bet would be to get a 3.5" pulley and a scan tool.
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