Folks, working on a V that at about 4300 RPM falls on it's face every time. On the dyno chart, it actually has almost a straight line drop of about 60 hp/tq, and then the curve rides out to the end of the pull, however isn't nearly as smooth as it should be. I have attached a tune and a log from one of the pulls. I can't see what is happening.
It pulls real well up to that point, making 588 ft lb and the hp is on pace to hit 600
Mods are:
2.5 upper pulley
heat exchanger
cat delete pipes
btr stage 3 cam and valve train
airaid cai
ngk tr7ix plugs
msd wires