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1/4 Mile ET Equation:
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The 1/4 Mile ET (Elapsed Time) equation estimates the time it takes for a vehicle to complete a quarter-mile drag race based on its weight and horsepower. This formula provides a theoretical performance benchmark for automotive enthusiasts and racers.
The calculator uses the 1/4 Mile ET equation:
Where:
Explanation: The equation demonstrates the cubic relationship between power-to-weight ratio and elapsed time, where improving power-to-weight ratio significantly reduces quarter-mile times.
Details: Quarter-mile elapsed time is a standard performance metric in automotive racing and tuning. It helps enthusiasts compare vehicle performance, plan modifications, and set realistic performance goals.
Tips: Enter vehicle weight in pounds and horsepower. Both values must be positive numbers. The calculator will provide the estimated quarter-mile elapsed time in seconds.
Q1: How accurate is this formula?
A: This formula provides a theoretical estimate. Actual performance may vary due to traction, aerodynamics, transmission efficiency, and driver skill.
Q2: What is considered a good 1/4 mile time?
A: Times vary by vehicle type: 14+ seconds (average cars), 12-13 seconds (sports cars), 10-11 seconds (high-performance), sub-10 seconds (professional drag racing).
Q3: Does this account for drivetrain losses?
A: No, this formula uses engine horsepower. For wheel horsepower, results may need adjustment based on drivetrain efficiency (typically 15-20% loss).
Q4: Can I use this for motorcycles?
A: Yes, though motorcycle aerodynamics and power delivery differ, the formula still provides a reasonable estimate.
Q5: What factors affect real-world quarter-mile times?
A: Traction, launch technique, weather conditions, altitude, tire pressure, and vehicle setup all significantly impact actual performance.