1. What is a Quarter Mile ET Calculator?

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

Purpose: It helps automotive enthusiasts and racers predict quarter-mile performance times.

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) to estimate quarter-mile time.

3. Importance of Quarter Mile ET Calculation

Details: Quarter-mile time is a standard performance metric in drag racing, helping 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 calculation?
A: This provides a theoretical 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: Why is weight such an important factor?
A: Acceleration is directly related to power-to-weight ratio, making weight reduction as effective as power increases.

Q5: What's considered a good quarter-mile time?
A: Times vary by vehicle class, but generally: 14s for sports cars, 12s for performance cars, sub-10s for dedicated drag cars.