graygt07

i am looking at getting a 10% or 18% underdrive pulley to help my supercharger.
1. will either pulley work well enough to make everything on the car work as it does with the stock pulley?
2. how much of a difference in power will i get? 20hp 30 hp?

Jersey Stang

I think you mean overdrive pulley. It should bring on lots more boost, but i'd like to know exactly how much too.

Metal man

I www.RJMachine.co have made overdrive pulleys for Techco but I'm not sure what the HP difference was. Check with Evo. thats who we sold them to.

05 Mustang

it should give you a few more lbs of boost, and help with the torque..

bigray327

I went from 12 psi to 15 psi with my 10% OD pulley, and the Vortech 2.87" pulley.

I went with the 10% OD crank because the 18% requires an electric water pump. That's not necessarily a bad thing, I just didn't feel like doing both at the same time.