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Elapsed Time Prediction Formula:
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The Horsepower to 1/8 Mile Calculator estimates the elapsed time (ET) for drag racing over an 1/8 mile distance based on vehicle weight and horsepower. This formula provides a quick estimation of drag racing performance.
The calculator uses the elapsed time prediction formula:
Where:
Explanation: The formula calculates the cube root of the weight-to-power ratio and multiplies it by an empirical constant to predict 1/8 mile elapsed time.
Details: Accurate ET prediction is crucial for drag racers to estimate performance, compare vehicle setups, and plan racing strategies. It helps racers understand how weight and power changes affect their track 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 prediction?
A: This formula provides a good estimation but actual track times may vary due to traction, aerodynamics, driver skill, and track conditions.
Q2: What is a good 1/8 mile time?
A: For street cars, 8-10 seconds is common. Professional drag cars can run in the 4-6 second range. Times vary greatly by vehicle type and class.
Q3: Does this work for all types of vehicles?
A: The formula works best for rear-wheel drive vehicles with good traction. Front-wheel drive and all-wheel drive vehicles may have different performance characteristics.
Q4: How does weight reduction affect ET?
A: Reducing weight has a significant impact on ET. Every 100 lbs removed can improve ET by approximately 0.1 seconds, depending on the vehicle.
Q5: Can I use this for 1/4 mile prediction?
A: This formula is specifically for 1/8 mile. For 1/4 mile, different constants and formulas are typically used.