Yesterday I installed the next-smaller pulley on my Whipple, I went with the 3.125" pulley, replacing the 3.25"

I then went to Performance Dyno in Loudon NH, and Josh put together a tune (with Pete on the phone a few times), that got me some really nice results.

I went from about 570 rwhp and about 470 rwtq to 608 rwhp and 517 rwtq

Not sure how to embed a video on here, but here's the link to the youtube vid of that last run with those numbers in it:

https://www.youtube.com/watch?v=oF_UKdFVucE

And the dyno sheet:




Some other pictures from yesterday: