Pulley combo questions

[micah2003svt]

I'm installing the new Whipple. I wanting to acheive 21lbs of boost.
What upper and lower combo do I need? Also what size alt. pulley?
I currently have a 6 and 8 pound lower.

 

[CobraBob]

I don't have an answer for you, but man, 21 lbs. of boost, eh? I assume that this is a primary race application?

 

[BlackSabbath]

I'm installing the new Whipple. I wanting to acheive 21lbs of boost.
What upper and lower combo do I need? Also what size alt. pulley?
I currently have a 6 and 8 pound lower.

A 3.25 upper with the 6lb lower should get you 21lbs.

 

[micah2003svt]

I just ordered a 2.55 upper I will see how that goes on the dyno. If i dont like the results I will go with a upper and lower combo.