1. What is the Horsepower to 1/8-mile Elapsed Time Equation?

The Horsepower to 1/8-mile 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 calculation is commonly used in automotive performance analysis and drag racing.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• \( ET \) — Elapsed Time (seconds)
• \( Weight \) — Vehicle weight (pounds)
• \( HP \) — Horsepower (hp)
• \( 6.290 \) — Empirical constant

Explanation: The equation uses a cube root relationship between the weight-to-power ratio and elapsed time, reflecting the non-linear nature of acceleration in drag racing.

3. Importance of ET Calculation

Details: Accurate ET estimation is crucial for performance tuning, race strategy planning, and comparing vehicle performance capabilities in drag racing scenarios.

4. Using the Calculator

Tips: Enter vehicle weight in pounds and horsepower in hp. Both values must be positive numbers. The calculator provides an estimated 1/8-mile elapsed time.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this equation?
A: This provides a theoretical estimate. Actual ET can vary based on traction, aerodynamics, transmission, and driver skill.

Q2: What is a typical 1/8-mile ET?
A: Street cars typically range from 8-12 seconds, while professional drag cars can achieve 4-6 seconds.

Q3: Does this account for drivetrain losses?
A: No, this calculation uses engine horsepower. For wheel horsepower, results may need adjustment.

Q4: Can I use this for 1/4-mile estimation?
A: While related, 1/4-mile times require different calculations as they involve different aerodynamic and traction considerations.

Q5: What factors affect actual ET besides weight and HP?
A: Traction, aerodynamics, gearing, shift points, track conditions, and weather all significantly impact actual performance.