Pulleys

Originally Posted by TBatt

Not compatible, you have to use a larger idler pulley if you go to a smaller SC pulley.

There are several ways to get to a 9psi drive system. You can either spin the jackshaft faster and leave the SC drive belt system as is (this is how Stillen does it) or you can keep the serpentine drive belt side stock and go to a smaller SC diameter pulley. Either way you spin the SC faster which increases boost.

When you spin the SC faster, it takes more power to do so which leads to belt slip on the serpentine drive belt at the jackshaft pulley. My kit gives the belt more wrap (contact area) on the jackshaft pulley and eliminates the belt slip.

When you increase boost, you increase the amount of power that is needed to drive the SC. At 9psi it takes around 60hp to drive the SC. That is a lot of power running through the serpentine belt. That is why my kit includes the HD belt. It can handle the load and the additional pulley insures that the jackshaft is getting all of the power to the SC. With a SC, it takes power to make power where a turbo is kind of "free" power.

I like the linear power curve of the SC. I can look at my tach and tell you how much power the engine is making. It is purely a function of throttle position and RPM. I love it!