i recently bought a D1SC kit for my 86 and its rated for 15-20 psi but i only want to run 8-10 psi. I have someone that can make the pulley for me but i need to know the diameter of the pulleyto produce these numbers. if anyone could help it would be greatly appreciated

 

You can call Prochrager (the #s will be in the kit) and they will provide advice and sell you a pulley (they have them in all the right sizes. I went through about five sizes before I finally settled on the one I like best for my D1SC. By the way, alot of folks have trouble with the frame for the idler and tensioner pulley on the D1SC: at least on 'vettes and some small block Camaros. It warps and throws the belt - doesn't look warped but is.

There is a modified upgraded frame and puelly set available from A&D Covette that is worth looking into. Don't know if it fits your kit, though, although it will surely fit on the SCrs.

https://www.aandacorvette.com/cart/s...p?MainCatID=18

Just go to that and scroll down a page "Upgraded Supercharger Bracket.