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Quarter Mile Elapsed Time Equation:
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The Quarter Mile Elapsed Time equation estimates the time it takes for a vehicle to complete a quarter-mile (402.336 meters) drag race based on the vehicle's weight and horsepower. This formula provides a theoretical estimation of acceleration performance.
The calculator uses the quarter mile elapsed time equation:
Where:
Explanation: The equation demonstrates the cubic relationship between power-to-weight ratio and acceleration performance, where a small increase in power-to-weight ratio results in a significant improvement in quarter mile time.
Details: Quarter mile time is a standard performance metric in automotive racing and testing. It provides a comprehensive measure of a vehicle's acceleration capabilities, combining both power and weight factors into a single performance indicator.
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 equation?
A: This provides a theoretical estimation. Actual quarter mile times can vary due to traction, gearing, aerodynamics, driver skill, and other factors.
Q2: What is considered a good quarter mile time?
A: For production cars, under 14 seconds is good, under 12 seconds is excellent, and under 10 seconds is exceptional. Professional drag cars can achieve times under 6 seconds.
Q3: Does this account for drivetrain losses?
A: No, this calculation uses engine horsepower. For wheel horsepower, results may need adjustment based on drivetrain efficiency.
Q4: Can this be used for motorcycles?
A: Yes, the same principle applies, though motorcycle quarter mile times are typically faster due to better power-to-weight ratios.
Q5: What factors affect quarter mile time besides weight and horsepower?
A: Traction, tire type, transmission type, launch technique, aerodynamics, and weather conditions all significantly impact actual quarter mile performance.