I put my car on the dyno last friday, and I'm trying to figure out why my power drops 25hp out of nowhere at 5800 RPM's. Heres a link to the graph.
http://www.ls1camaro.net/freehosting/Z28dyno8-13-04.JPG
That doesn't seem normal to me. The only 2 things I can think of are the tune, which is obviously too rich so I'm having another sent out, or I put too much preload on my Comp R lifters (1/4 turn), but I'm only running it up to 6K so I don't see how that would cause it.

 

It appears to go rich at that time, too.

Try the simple stuff first, like a coil.

Mike

 

The guy that did the dyno runs said it felt electrical to him. I don't know how you can feel that on the car, but I might as well do wires and a coil. How much is a new coil?

 

A collapsed lifter can definately do that. Also look for intake leaks in addition to the other suggestions.

 

The lifters only have 200 miles on them and they are Comp R's so I don't think I collapsed a lifter. Mabey its just tuning related?