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Quarter-Mile Elapsed Time Formula:
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The quarter-mile elapsed time formula estimates a vehicle's performance in drag racing based on its weight and horsepower. It provides a theoretical elapsed time (ET) for completing a quarter-mile distance from a standing start.
The calculator uses the quarter-mile elapsed time formula:
Where:
Explanation: The formula calculates the theoretical quarter-mile time based on the power-to-weight ratio of the vehicle, with the cube root relationship accounting for the non-linear acceleration characteristics.
Details: Accurate ET estimation is crucial for drag racing enthusiasts to predict vehicle performance, compare different setups, and set realistic expectations for track performance.
Tips: Enter vehicle weight in pounds and horsepower. Both values must be valid (greater than 0). For best results, use the vehicle's actual curb weight and measured horsepower at the wheels.
Q1: How accurate is this formula?
A: This formula provides a theoretical estimate. Actual ET can vary based on traction, aerodynamics, driver skill, and transmission type.
Q2: What is a good quarter-mile time?
A: Times vary by vehicle type, but generally: 14+ seconds (average street cars), 12-13 seconds (performance cars), 10-11 seconds (modified cars), sub-10 seconds (dedicated race cars).
Q3: Does this formula account for drivetrain losses?
A: No, for more accurate results, use wheel horsepower rather than engine horsepower to account for drivetrain losses.
Q4: What other factors affect quarter-mile times?
A: Traction, launch technique, weather conditions, altitude, tire type, and gearing all significantly impact actual quarter-mile performance.
Q5: Can this formula be used for motorcycles?
A: While the basic physics applies, motorcycles have different weight distribution and traction characteristics, so results may be less accurate.