Horsepower vs. Torque ?

[DBXXX_imp]

Horsepower does work and is what accelerates the vehicle. Torque is a simple force and can be increased or decreased without a change in horsepower. Torque X speed = horsepower. Neither one is energy.

I don't understand why anybody even talks about horsepower. To elaborate a little bit on what Dakota said:

Horsepower = Torque x RPM

If you know the torque curve, then you know the horsepower curve automatically. The confusion between torque and energy is that they share the same unit, the newton-meter (http://en.wikipedia.org/wiki/Torque#Units). Torque is a measure of how much force is transferred to the crank each rotation, so you multiply by how fast the rotations are to get the total power.