Hello guys!!

I need to reinstall the stock underdrive pulley, and have no clue what size belt would fit on a 4 psi supercharger.
Does anybody know????? ???

The belt that came with my supercharger kit when I bought it is:

Kelly Springfield
automotive v-ribbed belt
922K6

:)

Thanks!!!!!!!!

I'm curious, what pulley did you have on it before re-installing the stock pulley?

i think she had the bpe underdrive pulley on with the supercharger, which results in a loss of boost. going back to the stock crank pulley would spin the super faster and get the normal 4 psi that was intended by alpine.

Ok. I didn't think i would get a s/c at all. I was actually gonna start n/a until i found a good deal on the s/c. Anyhoo, I got Nick Boers' light weight underdrive pulley, and had no idea that it would decrease the boost on the s/c, so I left it as is. Now that i found out, i have to replace it all over again.

Yeah, so hurry it up and ship that baby to me!!! j/k

Actually, the best set-up is, keeping the Underdrive Crank Pulley, and get Next Gen's smaller 2.75 inch 8 PSI S/C Pulley, which should bring the Boost close to 4 PSI......

Actually, the best set-up is, keeping the Underdrive Crank Pulley, and get Next Gen's smaller 2.75 inch 8 PSI S/C Pulley, which should bring the Boost close to 4 PSI......

I would rather install the stock pulley, sell the underdrive and get the 8psi pulley. That way you actually get the 8psi you pay for. You would also have more power. Why pay for 8psi when you only get 4psi?

Actually, those are my intentions. I would like to put that stock underdrive pulley back on, and get that 8 psi pulley for the S/C.

Livinitup: I'm sooooo damn sorry for the delay. I'm getting my car worked on very soon.