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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 drag race based on weight and horsepower. It provides a theoretical prediction of drag racing performance.
The calculator uses the quarter mile ET equation:
Where:
Explanation: The equation demonstrates the cubic relationship between power-to-weight ratio and elapsed time, showing how small changes in either weight or horsepower can significantly affect quarter mile times.
Details: Accurate ET prediction is crucial for drag racing enthusiasts, automotive engineers, and performance tuners to estimate vehicle performance, compare different setups, and set realistic performance goals.
Tips: Enter vehicle weight in pounds and horsepower. Both values must be positive numbers. The calculator provides theoretical elapsed time in seconds for a quarter mile drag strip.
Q1: How accurate is this equation?
A: This provides a theoretical estimate. Actual ET can vary due to traction, aerodynamics, transmission type, driver skill, and track conditions.
Q2: What is a good quarter mile time?
A: Times vary by vehicle type: 14-16 seconds for sport compacts, 12-14 seconds for muscle cars, 10-12 seconds for modified cars, and under 10 seconds for dedicated drag vehicles.
Q3: Does this account for drivetrain loss?
A: No, this uses engine horsepower. For wheel horsepower, you may need to adjust for typical drivetrain losses (15-20% for RWD, 20-25% for FWD/AWD).
Q4: Can I use this for motorcycles?
A: Yes, but motorcycle ETs are typically faster than cars with similar power-to-weight ratios due to better aerodynamics and traction.
Q5: What factors affect real-world ET besides weight and HP?
A: Traction, launch technique, shift points, aerodynamics, tire pressure, suspension setup, and weather conditions all significantly impact actual performance.