Quote Originally Posted by quicksilverado View Post
The rpm is not off. Look at the hp and tq scales on opposite sides off the graph. They are scaled different. That is what makes it look like it is off.
the curves are crossing at 4200 rpm. the scaling of hp and tq is irrelevant. i think the dyno itself may need some calibrating. try it on a different dyno and see what it reads. i am surprised no one caught this at the shop. Where was it dyno'd?