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Wallace Racing Quarter-Mile Equation:
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The Wallace Racing quarter-mile equation estimates elapsed time (ET) for a vehicle to complete a quarter-mile drag strip based on horsepower and weight. It provides a quick estimation of vehicle performance in drag racing scenarios.
The calculator uses the Wallace Racing equation:
Where:
Explanation: The equation demonstrates the cubic relationship between power-to-weight ratio and quarter-mile performance, where small changes in power or weight can significantly impact elapsed time.
Details: Quarter-mile time is a standard performance metric in automotive racing and tuning. It helps enthusiasts and professionals evaluate vehicle performance, compare different setups, and predict the impact of modifications.
Tips: Enter horsepower and vehicle weight in pounds. Both values must be positive numbers. For accurate results, use actual dyno-measured horsepower and curb weight including driver.
Q1: How accurate is the Wallace Racing equation?
A: It provides a good estimation for most vehicles but actual performance may vary due to traction, transmission type, aerodynamics, and driving technique.
Q2: What are typical quarter-mile times for different vehicles?
Q3: Should I use wheel horsepower or engine horsepower?
A: For most accurate results, use wheel horsepower (measured at the wheels) as it accounts for drivetrain losses.
Q4: What factors affect quarter-mile time besides power and weight?
A: Traction, gearing, shift points, aerodynamics, tire type, track conditions, and driver skill all significantly impact actual quarter-mile performance.
Q5: Can this calculator be used for motorcycles?
A: While the basic principles apply, motorcycles have different power delivery and traction characteristics, so results may be less accurate for two-wheeled vehicles.