1. What is the Quarter Mile ET Formula?

The Quarter Mile ET (Elapsed Time) formula estimates the time it takes for a vehicle to complete a quarter mile drag race based on horsepower and weight. This formula provides a theoretical estimation of vehicle performance in drag racing conditions.

2. How Does the Calculator Work?

The calculator uses the quarter mile ET formula:

Where:

• \( ET \) — Elapsed Time (seconds)
• \( HP \) — Horsepower
• \( Weight \) — Vehicle weight (pounds)

Explanation: The formula calculates the cube root of the power-to-weight ratio and divides 1353 by this value to estimate quarter mile elapsed time.

3. Importance of ET Calculation

Details: Quarter mile ET is a standard performance metric in drag racing that helps racers and enthusiasts compare vehicle performance, tune their vehicles, and predict race outcomes.

4. Using the Calculator

Tips: Enter horsepower and vehicle weight in pounds. Both values must be positive numbers. The calculator provides an estimated quarter mile time in seconds.

5. Frequently Asked Questions (FAQ)

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

Q2: What is a good quarter mile time?
A: For street cars, 12-14 seconds is considered quick. Professional drag cars can run under 6 seconds. Times under 10 seconds are extremely fast.

Q3: Does this account for drivetrain loss?
A: No, this formula uses raw horsepower. For wheel horsepower, you may need to adjust the input value based on drivetrain efficiency.

Q4: Can I use this for motorcycles?
A: Yes, the formula works for any vehicle, but motorcycle aerodynamics and rider position can affect actual performance.

Q5: What factors affect quarter mile time besides HP and weight?
A: Traction, gearing, shift points, aerodynamics, tire pressure, and weather conditions all significantly impact actual quarter mile performance.