winglesshatch
Registered User
i just picked up an 1990 automatic sc, i am wondering about pulleys, i see people run 5% and 10% pullies, what exactly does it mean, and how much boost does a sc run stock and what is a stock car and chager capable of
winglesshatch said:i just picked up an 1990 automatic sc, i am wondering about pulleys, i see people run 5% and 10% pullies, what exactly does it mean, and how much boost does a sc run stock and what is a stock car and chager capable of
Actually, ALL supercharger pulleys on SC's are overdrive pulleys. Anything more that a 1:1 ratio between the crank & the supercharger is an overdrive pulley. The M90 on the early SC's is Overdriven 250% Yes, two & a half times the crank speed. The 5 & 10% referr to Additional overdrive beyond the stock overdrive.CaifanSC said:The reason is that the pully is an overdrive pulley for the supercharger which creates more boost.