4 calculators in this category
- Quarter Mile ET & MPH CalculatorFox and Huntington ET correlationsEnter race weight with the driver in the seat and flywheel horsepower, and this calculator predicts the elapsed time and trap…
- Trap Speed Horsepower CalculatorTrap-speed cube law (empirical constant)Terminal speed at the end of a drag strip is set almost entirely by power and weight, which makes it the cheapest honest…
- Eighth Mile to Quarter Mile Conversion CalculatorEmpirical ET conversion factors with a constant-power cross-checkHalf the drag strips in the country run an eighth mile and the other half run a quarter, so comparing two timeslips means…
- Density Altitude Calculator for RacingISA density relation; SAE J1349 correction factorDensity altitude is the single number that tells you how much air the engine has to work with. It is the altitude in the…
Which one do you need?
- Quarter Mile ET & MPH Calculator
- Predict quarter-mile ET and trap speed from horsepower and race weight with the Fox and Huntington correlations, and find the power a target ET needs.
- Trap Speed Horsepower Calculator
- Estimate flywheel horsepower from quarter-mile trap speed and race weight with the cube law, and check any dyno number or power claim against it.
- Eighth Mile to Quarter Mile Conversion Calculator
- Convert eighth mile ET and trap speed to quarter mile equivalents and back, with the constant-power model that explains where the 1.5657 factor comes from.
- Density Altitude Calculator for Racing
- Compute density altitude, air density ratio, the SAE J1349 correction factor and the ET and MPH shift from track temperature, pressure and humidity.
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