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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 distance based on its horsepower and weight. This calculation is commonly used in motorsports and automotive performance analysis to predict vehicle acceleration performance.
The calculator uses the Quarter Mile ET equation:
Where:
Explanation: The equation calculates the power-to-weight ratio and applies a cubic root function to estimate the quarter-mile time, with 1350 being an empirical constant derived from performance data.
Details: Quarter mile time is a standard performance metric in motorsports that provides a comprehensive measure of a vehicle's acceleration capabilities. It helps racers, automotive enthusiasts, and engineers evaluate vehicle performance and compare different setups.
Tips: Enter horsepower and vehicle weight in pounds. Both values must be positive numbers. The calculator will provide an estimated quarter-mile elapsed time in seconds.
Q1: How accurate is this equation?
A: This equation provides a reasonable estimate for most vehicles, but actual performance can vary based on traction, transmission type, aerodynamics, and driving technique.
Q2: What is considered a good quarter mile time?
A: Times vary by vehicle type: economy cars (15-17 seconds), sports cars (12-14 seconds), supercars (10-12 seconds), and dedicated drag cars (under 10 seconds).
Q3: Does this account for driver weight?
A: No, this calculator uses vehicle weight only. For more accurate results, include driver and passenger weight in the total weight calculation.
Q4: Can I use this for motorcycles?
A: Yes, the equation works for any vehicle, but motorcycle times may be more affected by rider skill and traction limitations.
Q5: What factors affect quarter mile time besides HP and weight?
A: Traction, gearing, aerodynamics, tire type, transmission efficiency, and launch technique all significantly impact actual quarter mile performance.