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3.25 Pulley Help

S

s6dark6angel6s

New member
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
 


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...
 
bluegtp91 said:
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...
Click to expand...


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
 


s6dark6angel6s said:
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
Click to expand...

you must of misread cause thats def wrong 3.5 is for slightly modded cars
 
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
 


bluegtp91 said:
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...
Click to expand...

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.
 
...but the PCM doesnt do that...

it limits boost on torque management and traction control...that's it.
 


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.
 
Bio248 said:
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.
Click to expand...

And how should i know if the BBV its working fine?
 
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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