1. What is the Quarter Mile Equation?

The quarter mile equation estimates the elapsed time (ET) for a vehicle to complete a quarter mile (402 meters) based on its weight and horsepower. This calculation is commonly used in automotive performance testing.

2. How Does the Calculator Work?

The calculator uses the quarter mile equation:

Where:

• \( Weight \) — Vehicle weight in pounds (lbs)
• \( HP \) — Engine horsepower (hp)
• \( ET \) — Estimated quarter mile time in seconds

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

3. Importance of Quarter Mile Calculation

Details: Quarter mile time is a standard measure of a vehicle's acceleration performance and is widely used in drag racing and automotive testing.

4. Using the Calculator

Tips: Enter vehicle weight in pounds and engine horsepower. Both values must be greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: It provides a rough estimate. Actual performance depends on traction, gearing, aerodynamics, and other factors.

Q2: Does this include driver weight?
A: The weight should include the vehicle plus driver and any passengers or cargo.

Q3: What's a good quarter mile time?
A: Street cars typically range 12-16 seconds. Performance cars can be under 10 seconds.

Q4: How does gear ratio affect quarter mile?
A: While not in this basic equation, optimal gear ratios help keep engine in power band for maximum acceleration.

Q5: Can I use this for motorcycles?
A: Yes, but motorcycle times may vary more due to different power delivery and traction characteristics.