1. What is the Drag Race Equation?

The drag race equation estimates elapsed time (ET) for a 1/8 mile drag race based on vehicle weight and horsepower. It provides a theoretical performance estimate for drag racing vehicles.

2. How Does the Calculator Work?

The calculator uses the drag race equation:

Where:

• \( WT \) — Vehicle weight (pounds)
• \( HP \) — Engine horsepower
• \( constant \) — Empirical constant (typically 5.825 for 1/8 mile)

Explanation: The equation calculates the theoretical elapsed time based on the power-to-weight ratio of the vehicle, with an empirical constant to account for various factors affecting drag race performance.

3. Importance of ET Calculation

Details: Accurate ET estimation is crucial for drag racing enthusiasts to predict vehicle performance, compare different setups, and optimize their vehicles for competition.

4. Using the Calculator

Tips: Enter vehicle weight in pounds, horsepower, and the appropriate constant. All values must be valid positive numbers. The typical constant for 1/8 mile is 5.825.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this equation?
A: This provides a theoretical estimate. Actual performance may vary based on traction, aerodynamics, driver skill, and other factors.

Q2: What's a good ET for 1/8 mile?
A: Professional drag cars can run 4-5 seconds, while street-legal performance cars typically range from 6-9 seconds for the 1/8 mile.

Q3: Does this work for all types of vehicles?
A: The equation works best for rear-wheel drive vehicles with good traction. Front-wheel drive and all-wheel drive vehicles may have different performance characteristics.

Q4: 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.

Q5: How does weight reduction affect ET?
A: Reducing weight has a similar effect to increasing horsepower. A 10% weight reduction is roughly equivalent to a 10% horsepower increase in terms of ET improvement.