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Quarter-mile ET Formula:
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The Quarter-mile ET (Elapsed Time) formula estimates the time it takes for a vehicle to complete a quarter-mile (402 meters) drag race based on its weight and horsepower. This formula provides a theoretical estimation of vehicle performance in straight-line acceleration.
The calculator uses the quarter-mile ET formula:
Where:
Explanation: The formula calculates the cube root of the weight-to-horsepower ratio and multiplies it by the constant 5.825 to estimate quarter-mile time.
Details: Quarter-mile time is a standard performance metric in automotive racing and testing. It helps compare vehicle acceleration capabilities, evaluate modifications, and predict racing performance.
Tips: Enter vehicle weight in pounds and horsepower. Both values must be positive numbers. The calculator will provide the estimated quarter-mile time in seconds.
Q1: How accurate is this formula?
A: This formula provides a theoretical estimation. Actual quarter-mile 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: 14-16 seconds for average sports cars, 12-14 seconds for performance cars, and under 10 seconds for dedicated drag racing vehicles.
Q3: Does this account for drivetrain losses?
A: No, this formula uses engine horsepower. For wheel horsepower, you may need to adjust the input value based on drivetrain efficiency.
Q4: Can this be used for motorcycles?
A: Yes, the formula works for any vehicle, but motorcycle times may be affected by different power-to-weight ratios and rider skill.
Q5: What factors affect quarter-mile time besides weight and horsepower?
A: Traction, aerodynamics, gearing, tire type, launch technique, and weather conditions all significantly impact actual quarter-mile performance.