An instrument used to estimate engine output based on performance metrics achieved over a distance of one-eighth of a mile. Input parameters typically include the vehicle’s weight and elapsed time to cover this distance. The calculated result provides an approximation of the power generated by the vehicle’s engine, assuming specific conditions such as optimal traction and minimal driver error.
This estimation method offers a practical way to assess the modification effects on an engine’s capabilities without needing direct dynamometer measurements. Historically, it has served as a readily accessible tool for racers and automotive enthusiasts to gauge improvements or compare the performance of different vehicles. The accuracy of the estimate depends heavily on the precision of the input data and the environmental conditions present during the test run.