Hey guys whats up.

I have a Supercharged Grand Prix that runs in the high 12's. My mods are

3.0" pulley
stage 2 cam
105lb springs/retainers
Thrasher intake
TOG Headers
42.5lb injectors
2.5" exhaust
Custom race tranny (hardened input shaft/shift kit/2800 tq converter)
160*tstat
Custom Tune
Aluminum Motor Mounts
And a driver pulling off 1.9 60 ft's on street tires.


http://www.1997gtp.net/images/rainshot4%20(Medium).jpg
http://www.1997gtp.net/images/interior3%20(Medium).jpg


Anyways.. i got a buddy who JUSt got a cobalt SS..

and he says he just put on a 2.8" pully, intake, and exhaust.


My question is.... with that small of a pulley, does he see knock???

Our cars have a 3.8" pulley stock. the comparison would be me running a 3.1" with intake and exhaust which would net me 14*+ of knock retard = ENGINE BLOWING UP.

Do you guys need supportive mods to run that small of a pulley? Please enlighten me as i am dumbfounded by what he said.


Also, is it possible to make 265WHP with his 2.8", intake, and exhaust??

Thanks Guys.

Nice car man, welcome!

Do you guys need supportive mods to run that small of a pulley? Please enlighten me as i am dumbfounded by what he said.

Also, is it possible to make 265WHP with his 2.8", intake, and exhaust??


nice car man

as for the knock, it's a good question. i think only a few people have gauges that read knock right now, so i couldn't give you an honest answer. but our oem pulleis are 3.4" or 3.35" something like that, so we're already 1/2" smaller than you on the start.

the 265whp... it's not going to happen unless he's got a generous dyno, not many cobalts have this done to them yet, but the redlines i think the most i've seen is like 250 something on a dynojet and that's with the $600 psi-fi piggyback, not just the pulley