This has been extracted from 'Briskoda.net'. I found it a very helpful explanation as to how power is defined really:
BHP = Torque x RPM
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Take two cars doing 40mph. If one is producing 200lb/ft at 2000rpm (@40mph) and the other is producing 100lb/ft at 4000rpm (again at 40mph), the effective power transfered to the wheels will be the same. Car 2 is producing half the torque but is revving twice as fast and the gearing required to make it travel at 40mph means that is producing an equivalent amount of torque at the wheels. This is why a Civic type R is so bloody quick despite having very little torque - it takes advantage of it's high engine speeds through gearing.
Torque is what pushes the car along. BHP is a measure of how torque is delivered over the rev range.
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