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 distance based on its weight and horsepower. It's commonly used in drag racing to predict performance.

2. How Does the Calculator Work?

The calculator uses the 1/4 Mile ET equation:

Where:

• \( ET \) — Elapsed Time in seconds
• \( W \) — Vehicle weight in pounds (lbs)
• \( HP \) — Engine horsepower

Explanation: The equation shows that elapsed time is proportional to the cube root of the weight-to-power ratio.

3. Importance of ET Calculation

Details: ET calculation helps racers estimate 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 greater than zero for accurate calculations.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: It provides a rough estimate. Actual ET depends on traction, aerodynamics, gearing, and driver skill.

Q2: What's a good 1/4 mile time?
A: Street cars typically run 12-15 seconds. Performance cars can run under 10 seconds. Professional dragsters run under 6 seconds.

Q3: Does this account for drivetrain loss?
A: No, you should use wheel horsepower (measured at the wheels) for more accurate results.

Q4: Can I use this for motorcycles?
A: Yes, but motorcycle ETs are often better than predicted due to their lighter weight and better power-to-weight ratio.

Q5: What's the fastest possible 1/4 mile time?
A: The current record is around 3.6 seconds for top fuel dragsters at over 330 mph.