belt sizes for 10% on blower and 5% jackshaft

steveos89xr7

Registered User
I have a 10% on my blower. I'm adding the 5% jackshaft pulley. Now will the belts I have on now work or will I have slippage issues? If not what belt sizes should I get? Thanks for any replies
 
What size supercharger belt do you have now? Are you running the stock diameter supercharger belt tensioner idler?

A 5% jackshaft-to-supercharger pulley will have a slightly larger diameter, which if anything should help reduce the chance of slip.

The jackshaft-to-crank pulley diameter won't change, so that belt shouldn't need to either.
 
I run the same combo, and I run a 425K7 from the crank to the JS, and a K080390, which is also sometimes listed as an 8PK994 from the JS to the SC. I also have the heavy duty tensioner springs, and I have my tensioners clocked, but no belt slip with that combo.
 
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