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Wallace 1/4 Mile ET Equation:
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The Wallace 1/4 Mile ET Equation is a widely used formula in drag racing to estimate the elapsed time (ET) for a vehicle to complete a quarter-mile distance based on weight and horsepower.
The calculator uses the Wallace 1/4 mile ET equation:
Where:
Explanation: The equation calculates the cube root of the weight-to-horsepower ratio and multiplies it by the constant 5.825 to estimate quarter-mile elapsed time.
Details: Accurate ET estimation is crucial for drag racing enthusiasts, vehicle tuners, and performance analysts to predict vehicle performance, compare setups, and optimize power-to-weight ratios.
Tips: Enter vehicle weight in pounds and horsepower. Both values must be positive numbers. The calculator provides an estimated quarter-mile elapsed time in seconds.
Q1: How accurate is the Wallace ET equation?
A: The Wallace equation provides a good estimate for most vehicles but actual performance may vary based on traction, aerodynamics, transmission type, and other factors.
Q2: What is considered a good 1/4 mile time?
A: Times vary by vehicle type: 8-9 seconds for professional dragsters, 10-12 seconds for high-performance cars, 13-15 seconds for sports cars, and 15+ seconds for average passenger vehicles.
Q3: Does this account for driver weight?
A: The weight input should include the total vehicle weight including driver, passenger, and any additional cargo for accurate results.
Q4: What are the limitations of this equation?
A: The equation assumes perfect traction and doesn't account for aerodynamics, transmission efficiency, tire grip, or weather conditions that can affect actual performance.
Q5: Can this be used for different racing distances?
A: This equation is specifically calibrated for quarter-mile distances. Different equations exist for eighth-mile and other racing distances.