Torque speed is actually the end result of the equation, torque plus engine revolutions per minute, or RPM. The speed of a moving car is directly proportional to the RPM that the engine generates. RPM can only be created by force, and the amount of rotational force, known as torque, determines the rate of RPM.
Torque as a Force
Engine power, and rate of quick acceleration, depend on the amount of force the engine can send through the car's transmission. A car's speed specifically results from the motion of torque. Torque is a specialized force that produces rotating motion around an axis or pivot, and these rates of rotation can be measured on any vehicle with a dynometer. The larger the engine, the greater amount of torque. This is why larger engines generate more power.
Horsepower and Torque
The amount of horse power can be calculated for any vehicle by multiplying the rate of torque obtained from a dynometer by the number of vehicle RPM. This result is then divided by the the number 5,252 to get the specific engine horsepower. Some vehicles, that may otherwise have less horsepower, can be equipped with a device known as a torque converter, instead of an engine upgrade. A torque converter works with an automatic transmission system, to output more torque to the drive shaft than the engine can produce by itself.