Originally Posted by TrueStreetTim
(Crank pulley size / Blower pulley size X step up ratio) X max rpm= impeller speed
Bold items are simply to separate the math
I'm assuming a lot here as I don't have all your specs. So your roughly 630whp? I'll also assume you've got headers & full exhaust?
P1SC-1's max impeller (max efficiency) speed is 65k. It should also be a 4.1 gear (step-up) ratio. Your blower pulley roughly a 3.60? And crank pulley a 7.5.
So [I](Crank pulley size / Blower pulley size x step up ratio) x max rpm= 61.5k impeller speed @ 7,200rpm. So your around 95% the max efficiency.
To see that kind of power on a P1 I'm guessing the car is around 12-14psi. What kind of psi are you seeing?
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Ok lower pulley is the crank but hey the math was right. I wasn't thinking when I wrote lower
Hey what's the stock crank pulley on a fox. I think it's a 6" but can't remember.