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Quarter-mile ET Formula:
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The quarter-mile elapsed time (ET) formula calculates the time it takes for a vehicle to complete a quarter-mile distance based on its horsepower and weight. This is a fundamental performance metric in drag racing and automotive performance analysis.
The calculator uses the quarter-mile ET formula:
Where:
Explanation: The formula demonstrates the cubic relationship between power-to-weight ratio and acceleration performance, where ET decreases as the power-to-weight ratio increases.
Details: Quarter-mile time is a standard performance benchmark in automotive testing. It helps compare vehicle acceleration capabilities, evaluate modifications, and predict racing performance.
Tips: Enter horsepower and vehicle weight in pounds. Both values must be positive numbers. The calculator provides estimated quarter-mile elapsed time in seconds.
Q1: How accurate is this formula?
A: This formula provides a good estimate for most vehicles, but actual performance may vary due to traction, transmission efficiency, aerodynamics, and other factors.
Q2: What is 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 professional drag cars (under 7 seconds).
Q3: Does this account for driver skill and conditions?
A: No, this is a theoretical calculation based on power and weight only. Real-world performance depends on traction, shifting, track conditions, and driver ability.
Q4: Can I use this for electric vehicles?
A: Yes, but electric vehicles often have different power delivery characteristics that may affect actual performance compared to the calculation.
Q5: What factors can improve quarter-mile times?
A: Increasing horsepower, reducing weight, improving traction, optimizing gearing, and enhancing aerodynamics can all contribute to better quarter-mile times.