just curious if anyone has a guess on what the HP increase would be if I increased my max impeller speed another 5-6000 rpm? and also can I still use the same belt or do I need a smaller one? I would be going from a 3.9 to a 3.7inch pully. trying to make up for some of the lost HP going to my new transmission setup.

 

For the belt I would call Procharger. Im thinking that you would need a smaller belt.

 

I called procharger and they told me I should see a 3-4 psi increase and it should be the same belt size.