1. What is the 1/4 Mile ET Equation?

The 1/4 Mile ET (Elapsed Time) equation estimates the time it takes for a vehicle to complete a quarter-mile drag race based on its weight and horsepower. This formula provides a theoretical estimation of a vehicle's performance potential.

2. How Does the Calculator Work?

The calculator uses the 1/4 Mile ET equation:

Where:

• \( Weight \) — Vehicle weight in pounds (lbs)
• \( HP \) — Engine horsepower (hp)
• 6.29 — Empirical constant

Explanation: The equation shows that elapsed time is proportional to the cube root of the weight-to-power ratio. Lower ratios (more power or less weight) result in faster times.

3. Importance of ET Calculation

Details: ET estimation helps racers and enthusiasts predict vehicle performance, compare different setups, and set realistic expectations for quarter-mile times.

4. Using the Calculator

Tips: Enter vehicle weight in pounds and engine horsepower. Both values must be positive numbers. The result is a theoretical estimate that doesn't account for traction, aerodynamics, or drivetrain losses.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this formula?
A: It provides a rough estimate. Actual times may vary due to traction, shifting, aerodynamics, and other factors.

Q2: What's a good 1/4 mile time?
A: Street cars typically range 12-15 seconds. Performance cars can achieve 10-12 seconds, while dedicated dragsters can run under 7 seconds.

Q3: Does this account for driver skill?
A: No, this is a theoretical calculation based solely on weight and power. Driver skill can significantly affect actual times.

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 much does weight reduction help?
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.