1. What is a Quarter Mile Time Predictor?

Definition: This calculator estimates a vehicle's 1/4-mile elapsed time (ET) based on its weight and horsepower.

Purpose: It helps automotive enthusiasts and racers predict drag strip performance without actual test runs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula approximates the relationship between power-to-weight ratio and acceleration performance.

3. Importance of Quarter Mile Time Estimation

Details: Quarter mile time is a standard performance metric that helps compare vehicle acceleration capabilities.

4. Using the Calculator

Tips: Enter the vehicle's curb weight (including driver) in pounds and the engine's horsepower. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this prediction?
A: This provides a rough estimate. Actual times vary based on traction, gearing, aerodynamics, and driver skill.

Q2: Should I use wheel horsepower or crank horsepower?
A: For most accurate results, use wheel horsepower (measured at the wheels).

Q3: Does this account for forced induction?
A: The formula works for both naturally aspirated and forced induction engines.

Q4: What's a good quarter mile time?
A: Times vary by vehicle type: 14-16s for sports cars, 12-14s for performance cars, sub-10s for dedicated drag cars.

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