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1/8 Mile ET Equation:
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The 1/8 Mile ET (Elapsed Time) equation estimates the time it takes for a vehicle to complete an 1/8 mile drag race based on weight and horsepower. This calculation helps racers predict performance and optimize their vehicle setup.
The calculator uses the 1/8 mile ET equation:
Where:
Explanation: The equation shows that elapsed time is proportional to the cube root of the weight-to-power ratio, demonstrating how power-to-weight ratio significantly impacts acceleration performance.
Details: Accurate ET estimation is crucial for drag racers to predict vehicle performance, compare different setups, and make informed decisions about modifications to improve acceleration times.
Tips: Enter vehicle weight in pounds and horsepower. Both values must be positive numbers. The calculator will provide the estimated 1/8 mile elapsed time in seconds.
Q1: How accurate is this ET calculation?
A: This provides a good estimate for most vehicles, but actual performance can vary based on traction, aerodynamics, transmission type, and driver skill.
Q2: What is a good 1/8 mile ET?
A: For street cars, 8-10 seconds is common. Performance cars can run 6-8 seconds, while professional drag cars can achieve times under 5 seconds.
Q3: Does this account for drivetrain loss?
A: No, this calculation uses engine horsepower. For wheel horsepower, you may need to adjust the input value based on your drivetrain efficiency.
Q4: Can I use this for different racing distances?
A: This equation is specifically calibrated for 1/8 mile. Different constants are used for 1/4 mile and other distances.
Q5: What factors affect ET besides weight and horsepower?
A: Traction, aerodynamics, tire type, suspension setup, transmission gearing, and launch technique all significantly impact actual ET.