1. What is the ET Equation?

The ET (Elapsed Time) equation estimates the time it takes for a vehicle to complete a 1/8 mile drag race based on its weight and horsepower. This formula provides a quick approximation of performance potential.

2. How Does the Calculator Work?

The calculator uses the ET equation:

Where:

• \( Weight \) — Vehicle weight in pounds (lbs)
• \( HP \) — Horsepower (hp)

Explanation: The equation calculates the cube root of the weight-to-power ratio and multiplies it by a constant factor of 3.592 to estimate the elapsed time for a 1/8 mile run.

3. Importance of ET Calculation

Details: ET calculation is important for drag racing enthusiasts and automotive engineers to estimate vehicle performance, compare different setups, and predict race outcomes without actual track testing.

4. Using the Calculator

Tips: Enter vehicle weight in pounds and horsepower. Both values must be positive numbers. The calculator will provide an estimated elapsed time for a 1/8 mile drag race.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this ET estimation?
A: This provides a rough approximation. Actual ET can vary based on traction, aerodynamics, driver skill, and other factors.

Q2: Can this formula be used for 1/4 mile calculations?
A: No, this specific formula is designed for 1/8 mile distances. Different constants are used for 1/4 mile calculations.

Q3: Does this account for drivetrain losses?
A: No, this formula uses raw horsepower numbers. For more accurate results, use wheel horsepower instead of engine horsepower.

Q4: What is a good ET for a 1/8 mile?
A: Times vary by vehicle type, but generally: 6-7 seconds for high-performance cars, 7-9 seconds for sports cars, and 9-12+ seconds for average street cars.

Q5: How can I improve my ET?
A: Reduce weight, increase horsepower, improve traction, and enhance aerodynamics. Driver technique also significantly impacts actual ET.