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Quarter-mile Speed Formula:
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The Et to Mph calculation is an empirical formula used to estimate quarter-mile speed from elapsed time (ET). This calculation is commonly used in drag racing and automotive performance testing to predict vehicle speed based on time performance.
The calculator uses the empirical formula:
Where:
Explanation: The formula provides a quick estimation of quarter-mile speed based on elapsed time, using an empirical factor that accounts for vehicle acceleration characteristics.
Details: Quarter-mile speed calculation is essential for performance evaluation, vehicle tuning, and competitive racing. It helps racers and enthusiasts understand their vehicle's performance capabilities and make informed decisions about modifications.
Tips: Enter elapsed time in seconds and the appropriate empirical factor. The factor varies based on vehicle type, weight, and power characteristics. All values must be positive numbers.
Q1: What is a typical factor value?
A: Factor values typically range from 200 to 250, with higher values indicating better acceleration characteristics.
Q2: How accurate is this calculation?
A: This is an empirical estimation and may vary from actual measured speeds. Accuracy depends on using the correct factor for your specific vehicle.
Q3: What affects the factor value?
A: Vehicle weight, power-to-weight ratio, traction, gearing, and aerodynamic characteristics all influence the empirical factor.
Q4: Can this be used for different distance races?
A: This formula is specifically designed for quarter-mile (1320 feet) racing. Different formulas apply to other distances.
Q5: How do I determine the right factor for my vehicle?
A: Compare calculated results with actual measured speeds from multiple runs and adjust the factor accordingly for better accuracy.