slow95

I have a 95 Gsr with JRSC 10 psi pulley I/H/E 9:1 compression, and the car peaked at 212 whp and 169 pounds of torque when I had it on the dyno, now a stock Gsr I/H/E 10:1 compression with a 6psi pulley peaks at 208 whp and 153 pounds of torque.(numbers from the jackson web site)

So my question is what happened? is it because I lowered my compression or is somthing wrong with my car? I thought for sure the car would have atleast another 20-30 horses to it.

Drew Peacock

Yep lower comp will yield lower numbers..

J337_UNIT

i doubt first of all there is a problem with your car.. if you are concerned run a compression test.. anyway, those JRSC get heat soaked very quickly and when that **** gets heatsoaked you lose power.. see forced induction is very sensitive to things like that.. anyway you can look into like an aftercooler or water injection.. theres been a few threads on this recently.. PLUS remember , that supercharger demands quite a few horses just to crank it. superchargers are known for the amount of drag is puts on the motor, so essentially your also losing potential power there. but check out some type of cooling method..that will help for sure..perhaps also a good header and exhaust set up

slow95

I did't think my car was messed up but I did not realize that the compression would cause such a dramatic drop in power. The place that did the dyno on my car siad I can cool my intake temps down buy having a 60 shot of nos is this true?
Also I remeber reading on this board some where about a guy who makes a stepper pulley for the JRSC does anyone know the name of the shop or a way to get ahold of him?