Stillen air to air conversion fabrication thread

[Pro4Jackster]

Originally Posted by TopgunZ

Just measured my pullies

Stillen 2.90"
Jackshaft 3.20"
SC 3.20"

With impellar upgrade this is supposed to see 12psi sea level

I cant see a 2.45", 2.75", and 2.70" making anything under 15 but I havent calculated it.

I tried to keep the front serp pulley as large as possible for better belt wrap and leverage. It only has about 30 degrees of wrap to work with. Wouldn't it be better to carbonite coat the 3.12" stock serp pulley and use the rear pulleys to increase blower RPMs? That plus an impeller upgrade should make 550hp on a 3.7L. I guess it's all just speculation until someone tries it.