A hp is the same as a whp (assuming you mean wheel horsepower) and a bhp. The units and magnitude are identical.
What I guess you mean is is the power measured the power at the wheels or the power at the flywheel. Well, chassis dynomometers (or rolling roads) measure the power at the wheels. Some claim you can let the engine coast to workout the drive train efficiency, but I do not believe this is accurate in any way. The rolling road itself simply has too much inertia to measure this accurately, so it's a best guess at best.
Engine Dynamometers measure the horsepower at the crank, so this figure is not what you get at the wheels after drivetrain losses are taken into account.
Basically, was the power measured on a rolling road or an engine dyno?
Finally, the torque is the more important thing. With the torque figures you can actually use maths to calculate the force in each gear at any rev, and from that work out the instantaneous acceleration of the vehicle. More detailed analysis would allow you to work out the accelation over time, and thus do full performance tests on paper.
Now, you might say "well I can get the torque from the power curve", and you'd be right, you can and it's easy. BUT, many of the rolling roads I've used (who I don't anymore) have torque and power curves that are not equivalent - (i.e. hp does not cross lbft at 5252rpm like it should. Therefore the figures from the entire session are utterly useless. So choose your 'Rolling Road Expert' carefully. The majority are cowboys.
