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Quarter Mile ET Equation:
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The Quarter Mile ET (Elapsed Time) equation estimates the time it takes for a vehicle to complete a quarter mile drag race based on its weight and horsepower. This formula provides a theoretical estimation of vehicle performance in drag racing conditions.
The calculator uses the Quarter Mile ET equation:
Where:
Explanation: The equation demonstrates the cubic relationship between power-to-weight ratio and quarter mile time, where better power-to-weight ratios result in faster times.
Details: Quarter mile time is a standard performance metric in automotive racing and tuning. It helps enthusiasts and professionals evaluate vehicle performance, compare different setups, and predict racing outcomes.
Tips: Enter vehicle weight in pounds and horsepower. Both values must be positive numbers. The calculator will provide the estimated quarter mile elapsed time in seconds.
Q1: How accurate is this equation?
A: This provides a theoretical estimation. Actual times may vary due to traction, aerodynamics, transmission efficiency, and driver skill.
Q2: What is considered a good quarter mile time?
A: Times vary by vehicle type: 14+ seconds for average cars, 12-13 seconds for performance cars, 10-11 seconds for supercars, and under 10 seconds for dedicated drag vehicles.
Q3: Does this account for drivetrain losses?
A: No, this calculation uses engine horsepower. For wheel horsepower, results may need adjustment for drivetrain efficiency (typically 15-20% loss).
Q4: Can I use this for motorcycles?
A: Yes, though motorcycle aerodynamics and power delivery characteristics may affect actual performance compared to the theoretical calculation.
Q5: What factors affect quarter mile times besides weight and horsepower?
A: Traction, gearing, aerodynamics, tire compound, track conditions, altitude, temperature, and launch technique all significantly impact actual performance.