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.^[1]

The formula for effective torque to the wheels is:^[2]

Tw = Te * N_tf * η_tf

N_tf = N_t * N_f

η_tf = η_t * η_f

... 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.^{[citation needed]} Effective torque is often 5-15% lower than the shaft or crank ratings of an engine due to drivetrain losses.

See also

• Machine torque