1. What is the Quarter Mile ET Equation?

The Quarter Mile Elapsed Time (ET) equation 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 estimate of vehicle performance in drag racing conditions.

2. How Does the Calculator Work?

The calculator uses the quarter mile ET equation:

Where:

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

Explanation: The equation calculates the cube root of the power-to-weight ratio and divides it into the constant 1353 to estimate quarter-mile elapsed time.

3. Importance of ET Calculation

Details: Quarter-mile elapsed time is a standard performance metric in drag racing. Accurate ET estimation helps racers understand vehicle potential, compare performance, and make informed modifications.

4. Using the Calculator

Tips: Enter horsepower and vehicle weight in pounds. Both values must be positive numbers. The result represents theoretical elapsed time for a quarter-mile drag race.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this ET calculation?
A: This provides a theoretical estimate. Actual ET depends on traction, aerodynamics, transmission, driver skill, and environmental conditions.

Q2: What is a good quarter-mile time?
A: For street cars, 12-14 seconds is good. Professional drag cars can achieve 6-7 seconds. Times below 10 seconds are considered very fast.

Q3: Does this account for drivetrain loss?
A: No, this uses engine 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 traction characteristics may affect actual performance.

Q5: What factors affect actual quarter-mile times?
A: Traction, launch technique, shifting speed, aerodynamics, temperature, altitude, and track conditions all influence actual performance.