[2forme]

Jeff, that's great. But I've personally seen different. I've seen a 91 map make X power, then everything was tuned for 93 octane on the same car... it made similar power (maybe 2-3 whp difference). I think knock might be a strong word. I'm referring to the timing being pulled up top on the 3 cars phasetek did causing the roller coaster power curve. The ECU pulled timing for a reason. I'm curious as to what it was.

My experience was also on a mustang dyno, rather than a dynapack... if that makes a difference. I think given the... generous... nature of a dynapack, then that would make sense.

If you'd like the charts, I'll have to see if I can get them. Mustang dynos don't give you runfiles like dyno jets. I only got a printout at the time. It was a little while ago, so I'm not sure if they even still have the runs stored on their computer.