Angusdog wrote:
Can someone explain how, on a rolling road dyno, they can get readings at the crank? Presumably they get a reading at the wheels, and extrapolate it back to the crank. Why? Unless you're going to use it as a stationary engine driving a chaff cutter, it's a pointless figure. Engines go in cars which drive wheels. So the figure they should publish is, I think, the original unmolested figure.
Unless you want an artificially high horsepower figure.
Ego? Feel Good Factor? It is all a bit guess work any way though everyone denies it. You cannot factor a constant loss percentage for all cars, it just is not possible. There is something else, well a couple of something elses, how does a person selling an NOS kit know that the kit is going to get 50hp or 100hp. On what car, what setup etc. Another one is the way head modifiers say it will flow 100hp, really?
