1. What is a Quarter Mile Time Calculator?

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 quarter-mile performance without actual track testing.

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 cube root of the weight-to-power ratio is multiplied by a constant factor (5.825) derived from empirical data.

3. Importance of Quarter Mile Time Calculation

Details: Quarter-mile time is a standard performance metric that helps compare vehicle acceleration capabilities and predict racing outcomes.

4. Using the Calculator

Tips: Enter the vehicle's curb weight in pounds and the engine's horsepower. For best results, use actual dyno-tested horsepower rather than manufacturer claims.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: It provides a reasonable estimate but actual times vary based on traction, gearing, aerodynamics, and driver skill.

Q2: Should I include driver weight in the calculation?
A: Yes, for accurate results include the vehicle's weight with driver and full fluids (race weight).

Q3: What's a good quarter mile time?
A: Times vary by vehicle type: 14-15s for sports cars, 12-13s for performance cars, sub-10s for dedicated drag cars.

Q4: Does this account for forced induction?
A: The formula works for both NA and forced induction as long as you input the actual horsepower.

Q5: Why the cube root in the formula?
A: The cube root relationship reflects the non-linear relationship between power-to-weight ratio and acceleration.