I have the P1SC-1 and the crank pulley is 6.75" and 3.7" blower pulley and made 6.5 lbs boost and made 566rwhp then went to 3.4" blower pulley and made 8.2lbs boost no Dyno run. Then I put a 3.2" blower pulley and made 10.2 lbs of boost and dyno tuned at 661rwhp 575rwtrq @ 6250 rpm. If that helps any, but make sure you do not over spin the blower. ProCharger has a calculator on their page to help figure out rpm of the blower. 
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2015 2SS RS 1LE NPP/w Kooks headers, Procharged, ID1050X injectors, Katech belt tensioner, Mighty Mouse Catch Can, BMR subframe connectors, Matco driveshaft loop, AEM Wideband/Boost/Fuel gauges , Z/28 Splitter and Spoiler/w Wicker bill, Power Stop rotors and brake pads, MRR Z/28 Rep Wheels 20" w/p zeros 285 fronts and 305 rears, ZL1 addons Rock guards and Tow hook, Rear window louvers, Flags on the quarter windows and the moonroof, Billet aluminum door handles.
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