I'm running a 2.80/#4 combo with a 3.2 Atl pulley and a Gates 080780 belt and a new Billet Flow bracket with a 100mm idler. I'm getting a lot of belt slip after 5000rpms with MAF counts up and down and noticeable belt dust. I hit 11.6-11.7 a/f then at 5000rpms it dips to 10.3 rich. An employee at Napa said a 080780 belt I have measures 78.5". I'm going to try a smaller Gates belt that measures 78" and see how that works. I have not even put on my other 3 idlers yet.
I also need to check my lower idler to see what position it is in. Anyone have a suggestion whether it needs to be upper or lower?
I need better numbers than a 490rwhp/522rwtq with my setup.