1. What is the 1/8 Mile ET Equation?

The 1/8 Mile ET (Elapsed Time) equation estimates the time it takes for a vehicle to complete 1/8 mile based on its weight and horsepower. This is commonly used in drag racing to predict performance.

2. How Does the Calculator Work?

The calculator uses the 1/8 Mile ET equation:

Where:

• \( Weight \) — Vehicle weight in pounds (lbs)
• \( HP \) — Engine horsepower (hp)
• 0.64 — Empirical constant
• 0.333 — Exponent (cube root)

Explanation: The equation accounts for the power-to-weight ratio of the vehicle, which is the primary determinant of acceleration performance.

3. Importance of ET Calculation

Details: ET calculation helps racers estimate their vehicle's performance, compare different setups, and predict the effects of weight reduction or power increases.

4. Using the Calculator

Tips: Enter vehicle weight in lbs and horsepower in hp. Both values must be positive numbers. The calculator will estimate the elapsed time for 1/8 mile.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this estimation?
A: This provides a rough estimate. Actual ET depends on many factors including traction, aerodynamics, and launch technique.

Q2: What's a good 1/8 mile ET?
A: For street cars, 8-10 seconds is typical. Performance cars may run 6-8 seconds, while dedicated dragsters can be under 5 seconds.

Q3: Can I use this for 1/4 mile estimation?
A: No, this is specifically for 1/8 mile. 1/4 mile times would be longer and require different calculations.

Q4: Does this account for drivetrain losses?
A: No, this uses raw horsepower numbers. For more accuracy, you might want to use wheel horsepower instead of engine horsepower.

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