I had my car dynoed last year after the new slave was installed. The car did 544/556 on a Mustang Dyno. My questions is this, what do you all think is up with the car? It makes peak power at 5300 RPM'S. The car has a 220/224 114LSA Comp Cam and springs, an LS6 intake, stock '98 heads, TPIS headers, Corsa Pace exhaust, gutted stock cats and midpipe, etc...,and a Vortech V2 SQ blower with a cog belt drive (pulley that spins the blower is spun by the serpentine belt)(about 6-7PSI). The A/F ratio also gets really rich and ends up around 11:1 after 5300. The car was tuned 12:1on a Dynojet through the tailpipe with cats and made 538RWHP on a Dynojet. Now has no cats and the A/F was read right after the headers, which is why I think the car is now at almost 13:1 everywhere else in the RPM range, and the car made 544RWHP on a MD. My buddy thinks that the cam may be off a tooth or not degreed properly and causing it to peak so early, and that the car should be making peak power (and probably peak boost of about 8-9PSI) closer to 6000-6500RPM'S. At the track the one run I shifted at about 5500 instead of 6000, the Trap speed went from 122-123 to almost 126. I believe with the power the car is making, the traps should be even higher, and if it pulled to 6000+, I believe they should be, I just cant figure out why it peaks so soon. I cant even get ahold of the guy who installed the cam, so I dont know what he did when he installed it. What do you guys think? Any input would be appreciated.

Dynograph

 

Thats not Cam. Could be belt slip,valves floating,knock retard.

 

I know for belt slip, I should put it back on the dyno and check the boost through the run and the same with knock retard (hooked to a computer). With belt slip though, how would I know if the belt isnt slipping a little? With knock retard, would the car get so rich? Also, I dont know how to check for valve float. How would I know if that is the problem? Thanks for the input Slowhawk.

 

valve float can usually be seen in the graph up top.... post it up.

 

The dynograph is posted up top and http://s194.photobucket.com/albums/z...t=scan0001.jpg

 

Anyone, Please??

 

Belt slip.
1; if it were a tooth off, it would have more problems than just falling off after 5200.
2; it doesnt just peak early, it falls off bad.
3; when it falls off, it goes pretty damn rich.
4; how do we richen a mixture? Add fuel, or take away air, from a set amount of fuel.