1. What is an ET MPH Horsepower Calculator?

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

Purpose: It helps automotive enthusiasts and professionals evaluate a vehicle's performance without dyno testing.

2. How Does the Calculator Work?

The calculator uses two formulas:

Where:

• \( HP \) — Horsepower at the wheels
• \( W \) — Vehicle weight (pounds)
• \( ET \) — 1/4-mile elapsed time (seconds)
• \( MPH \) — Trap speed at finish line (miles per hour)

Explanation: The formulas derive from empirical data and physics of acceleration, accounting for the relationship between power, weight, and time.

3. Importance of Performance Calculations

Details: Accurate performance metrics help in vehicle tuning, comparing modifications, and predicting track performance.

4. Using the Calculator

Tips: Enter the vehicle weight in pounds (including driver) and the 1/4-mile elapsed time in seconds. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why 5.825 in the formula?
A: This is an empirically derived constant that correlates ET to power-to-weight ratio across many vehicle types.

Q2: Does this calculate wheel or engine horsepower?
A: This estimates wheel horsepower. Engine horsepower would be higher due to drivetrain losses.

Q3: How accurate is this calculator?
A: It provides good estimates for most street vehicles, but aerodynamics and traction affect real-world results.

Q4: Should I use race weight or curb weight?
A: Use the total weight during the run, including driver, fuel, and any cargo.

Q5: Why does trap speed matter?
A: Trap speed indicates the vehicle's power potential, while ET reflects both power and traction.