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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 its weight and horsepower. This formula provides a theoretical performance benchmark for automotive enthusiasts and racers.
The calculator uses the quarter-mile ET equation:
Where:
Explanation: The equation demonstrates the cubic relationship between power-to-weight ratio and acceleration performance, where both weight and horsepower contribute equally as cube roots.
Details: Quarter-mile ET is a standard performance metric in automotive racing that helps enthusiasts compare vehicle performance, plan modifications, and set realistic performance expectations.
Tips: Enter vehicle weight in pounds and horsepower. Use curb weight for most accurate results. All values must be positive numbers greater than zero.
Q1: How accurate is this ET calculation?
A: This provides a theoretical estimate. Actual ET depends on traction, aerodynamics, transmission, driver skill, and other factors not accounted for in this simplified formula.
Q2: What is considered a good quarter-mile time?
A: Times vary by vehicle type: 14+ seconds for average cars, 12-13 seconds for performance cars, 10-11 seconds for sports cars, and under 10 seconds for dedicated race cars.
Q3: Should I use curb weight or gross weight?
A: For most accurate results, use curb weight (vehicle weight with fluids but without passengers or cargo). For racing conditions, include driver weight.
Q4: Does this work for electric vehicles?
A: The formula works in principle, but electric vehicles often have different power delivery characteristics that may affect actual performance compared to internal combustion engines.
Q5: How can I improve my quarter-mile time?
A: Reduce weight, increase horsepower, improve traction, optimize gear ratios, and enhance aerodynamics. Driver technique also significantly impacts actual performance.