Effective torque

Effective torque (often referred to as wheel torque or torque to the wheels) is a concept primarily associated with automotive tuning. Torque can be measured using a dynamometer. Common units used in automotive applications can include foot-pounds and Newton·meters.

The formula for effective torque to the wheels is:

Tw = Te * N * η

N = N * N

η = η * η

... where Tw is wheel torque, Te is engine torque, N is the gear ratio, η is the efficiency, and the subscripts t and f are for the gearbox and differential, respectively. Effective torque is often 5-15% lower than the shaft or crank ratings of an engine due to drivetrain losses.

See also

• Machine torque

References