I read where people buy a 4# lower and 2# upper and so on. How do you know what your boost should be. Does this give you say 6# of boost above the stock boost. Is there a formula you use to calculate it based on the size of the pulleys? Thanks for your help.

 

try this

http://www.ncs-stl.com/Files/BlowerRPM.xls

Andy

 

Thanks for the info Andy. Now I can calculate it for myself.