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Wallace 1/4 Mile ET Equation:
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The Wallace 1/4 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 performance benchmark for drag racing enthusiasts and automotive professionals.
The calculator uses the Wallace equation:
Where:
Explanation: The equation demonstrates the cubic relationship between power-to-weight ratio and elapsed time, showing how significant weight reduction and power increases affect quarter-mile performance.
Details: Accurate ET estimation helps racers predict vehicle performance, optimize modifications, and set realistic performance goals. It's widely used in drag racing for performance benchmarking and tuning decisions.
Tips: Enter vehicle weight in pounds and horsepower. Use actual measured horsepower for best accuracy. All values must be positive numbers greater than zero.
Q1: How accurate is the Wallace equation?
A: The Wallace equation provides a good theoretical estimate but actual performance may vary due to traction, aerodynamics, transmission efficiency, and driver skill.
Q2: What is considered a good quarter-mile time?
A: Times vary by vehicle type: 14-16 seconds for average sports cars, 12-14 seconds for performance cars, and under 10 seconds for dedicated drag racing vehicles.
Q3: Should I use wheel horsepower or engine horsepower?
A: For most accurate results, use wheel horsepower as it represents the actual power reaching the wheels after drivetrain losses.
Q4: Does this account for driver weight?
A: The equation uses total vehicle weight, so include driver weight and any additional cargo for accurate calculations.
Q5: Can this be used for motorcycles?
A: Yes, the equation works for any vehicle type as long as weight and horsepower inputs are accurate.