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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 its weight and horsepower. This formula provides a quick estimation of vehicle performance in drag racing scenarios.
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 both weight reduction and power increases affect acceleration performance.
Details: Accurate ET estimation is crucial for drag racing enthusiasts, automotive engineers, and performance tuners to predict vehicle performance, compare different setups, and optimize power-to-weight ratios for better acceleration times.
Tips: Enter vehicle weight in pounds, horsepower value. 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 estimation for rear-wheel drive vehicles with good traction. Actual times may vary based on traction, transmission type, and driving technique.
Q2: What are typical 1/8 mile ET values?
A: Street cars typically range from 8-12 seconds, while professional drag cars can achieve 4-6 seconds. Faster times indicate better acceleration performance.
Q3: Does this account for drivetrain losses?
A: The formula uses horsepower at the wheels. For crank horsepower, multiply by approximately 0.85 for rear-wheel drive vehicles to account for drivetrain losses.
Q4: How does weight reduction affect ET?
A: Weight reduction has a cube root relationship with ET - reducing weight by 10% typically improves ET by approximately 3-4%.
Q5: Can this be used for different racing distances?
A: This formula is specifically calibrated for 1/8 mile distances. Different constants are used for 1/4 mile and other racing distances.