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Originally Posted by curtis73
Actually many dynos measure HP and calculate TQ. Many chassis dynos measure the amount of time and speed at which the engine is capable of accelerating the dyno's brake which can be extrapolated to HP.
HP (although mathematically linked to torque) is its own thing. It can be felt if you've ever driven an older porsche. The 2.0L engine makes about 200 lb-ft at 3000 rpms and 200 hp at 6000 rpms. Trust me, the 200 hp puts you back in your seat more than the 200 lb-ft does. Although its a tough concept to grasp, HP is its own force, not just a mathematical derivative of torque.
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You have that backwards.
Dyno's measure the reaction torque and the rotating speed. Power is calculated from those two values.
Power (kilowatts) = torque (Nm) x rotating speed (radians per second).
It's only you backwards folk in america who need funny conversion factors to make up for imperial units.
The conversion from power to torque is equivalent to converting force to power.
Power (kilowatts) = Force (N) x Velocity (m/s)
Most people can comprehend force better than torque.
For example, a chair provides force (it holds things up) but produces no power as it's not moving.