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Quarter Mile Time Equation:
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The Power to Weight 1/4 Mile Calculator estimates the elapsed time (ET) for a vehicle to complete a quarter mile distance based on its weight and horsepower. This calculation provides a theoretical performance benchmark for automotive enthusiasts and racers.
The calculator uses the quarter mile time equation:
Where:
Explanation: The equation demonstrates the cubic relationship between power-to-weight ratio and quarter mile performance, showing how significant small changes in either weight or horsepower can be.
Details: The power-to-weight ratio is one of the most critical factors in vehicle performance. A lower ratio (more power per pound) typically results in better acceleration and faster quarter mile times.
Tips: Enter vehicle weight in pounds and engine horsepower. Use actual measured values for most accurate results. All values must be valid (weight > 0, horsepower > 0).
Q1: How accurate is this calculation?
A: This provides a theoretical estimate. Actual performance depends on traction, transmission, aerodynamics, driver skill, and environmental 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 sports cars, 10-12 seconds for high-performance vehicles, and under 10 seconds for dedicated drag vehicles.
Q3: Should I use curb weight or gross weight?
A: For most accurate performance estimates, use curb weight (vehicle weight with fluids but without passengers or cargo).
Q4: Does this account for drivetrain loss?
A: This calculation uses engine horsepower. For wheel horsepower, results may vary by 10-20% depending on drivetrain efficiency.
Q5: Can I use this for motorcycles?
A: Yes, the formula works for any wheeled vehicle, though motorcycle results may differ due to different traction and aerodynamics.