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Quarter Mile ET Equation:
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The Horsepower to ET Calculator estimates quarter mile elapsed time (ET) based on vehicle horsepower and weight. This calculation provides a theoretical performance benchmark for drag racing enthusiasts and automotive professionals.
The calculator uses the quarter mile ET equation:
Where:
Explanation: The equation calculates the cube root of the power-to-weight ratio to determine the quarter mile elapsed time, with 1350 as the empirical constant for this relationship.
Details: Quarter mile time is a standard performance metric in automotive racing. Accurate ET estimation helps racers predict vehicle performance, compare different setups, and optimize their racing strategy.
Tips: Enter horsepower and vehicle weight in pounds. Use actual measured horsepower at the wheels for more accurate results. All values must be valid (HP > 0, Weight > 0).
Q1: What is considered a good quarter mile time?
A: For street cars, 12-14 seconds is good performance. Professional drag cars can achieve times under 7 seconds. Times vary significantly by vehicle type and modifications.
Q2: How accurate is this calculation?
A: This provides a theoretical estimate. Actual performance depends on traction, aerodynamics, transmission, driver skill, and other factors not accounted for in this simple formula.
Q3: Should I use wheel horsepower or engine horsepower?
A: For most accurate results, use wheel horsepower which accounts for drivetrain losses. Engine horsepower will give optimistic results.
Q4: What factors affect quarter mile times besides HP and weight?
A: Traction, gearing, aerodynamics, tire compound, suspension setup, launch technique, and weather conditions all significantly impact actual quarter mile performance.
Q5: Can this calculator be used for motorcycles?
A: While the basic principle applies, motorcycles have different weight distribution and traction characteristics, so results may be less accurate for two-wheeled vehicles.