Well today i hit the dyno and me expecting about 400hp to my surprise i only did 360hp. Before with just a chip and a 8lb pulley i pulley 386. Now i have a ported eaton from apten and got a 360. Any ideas why?? Also the dyno graph seems strange to me like it's jumping what do you think??

dyno graph can be seen here:
http://www.nhtoc.com/forum/showthrea...&threadid=9518

 

How did the engine/exhaust sound? Could you tell it was fluctuating externally?

Was there any tire-slip--worn tires? Did the rear tires have equal air pressure?

Was the dyno drum binding internally?

Dan

 

the dyno was fine because the cars before me and after me were fine. Yes you could tell it was fluctuating internally. Maybe a bad coil pack, spark plug??