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Quarter Mile Elapsed Time Formula:
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Quarter Mile Elapsed Time (ET) is a standard measurement in drag racing that represents the time it takes for a vehicle to complete a quarter-mile (1,320 feet or 402 meters) distance from a standing start. It's a key performance metric for evaluating vehicle acceleration.
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 reflecting the diminishing returns of additional power.
Details: Quarter mile elapsed time is crucial for comparing vehicle performance, tuning modifications, and predicting race outcomes. It provides a standardized measure of acceleration capability across different vehicle types and classes.
Tips: Enter horsepower and vehicle weight in pounds. Both values must be positive numbers. The calculator provides a theoretical ET that may vary from actual performance due to traction, gearing, and other factors.
Q1: How accurate is this formula?
A: This formula provides a theoretical estimate. Actual ET can vary due to traction, transmission efficiency, aerodynamics, and driver skill.
Q2: What is a good quarter mile time?
A: For street cars, 12-14 seconds is considered fast, 14-16 seconds is average. Professional drag cars can achieve times under 6 seconds.
Q3: Does this account for drivetrain loss?
A: No, this formula uses engine horsepower. For wheel horsepower, you may need to adjust the input value based on drivetrain efficiency.
Q4: Can I use this for motorcycles?
A: Yes, the formula works for any vehicle, but motorcycle times may differ due to different weight distribution and traction characteristics.
Q5: Why use the cube root in the formula?
A: The cube root relationship reflects the reality that doubling horsepower doesn't halve the ET - there are diminishing returns as power increases.