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Quarter-Mile Performance Equations:
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The Quarter-Mile Calculator estimates vehicle performance in drag racing using horsepower and weight. It calculates both elapsed time (ET) and trap speed (MPH) for the standard 1/4 mile distance used in automotive performance testing.
The calculator uses established performance equations:
Where:
Explanation: These equations model the relationship between power-to-weight ratio and quarter-mile performance, accounting for acceleration physics and real-world drag racing data.
Details: Quarter-mile performance is the standard benchmark for measuring straight-line acceleration in the automotive world. It provides crucial data for comparing vehicle performance, tuning modifications, and understanding power delivery effectiveness.
Tips: Enter horsepower at the wheels for most accuracy. Use actual vehicle weight including driver and fuel. Both values must be positive numbers for valid calculations.
Q1: What's considered a good quarter-mile time?
A: Under 14 seconds is quick for production cars, under 12 seconds is very fast, and under 10 seconds is exceptional performance territory.
Q2: Should I use wheel horsepower or engine horsepower?
A: For most accuracy, use wheel horsepower which accounts for drivetrain losses. Engine horsepower will give slightly optimistic results.
Q3: How accurate are these estimates?
A: These provide good theoretical estimates, but actual performance depends on traction, gearing, aerodynamics, and driving skill.
Q4: What factors affect quarter-mile performance most?
A: Power-to-weight ratio is the primary factor, followed by traction, gearing, shift speed, and aerodynamic drag at higher speeds.
Q5: Can this calculator predict 0-60 times?
A: While related, quarter-mile performance doesn't directly translate to 0-60 times, which are more affected by initial traction and gearing.