1. What is an ET to HP Calculator?

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

Purpose: It helps automotive enthusiasts and professionals estimate engine power without dyno testing.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Estimated horsepower
• \( W \) — Vehicle weight (pounds)
• \( ET \) — 1/4-mile elapsed time (seconds)

Explanation: The formula relates a vehicle's acceleration performance (ET) to its power-to-weight ratio.

3. Importance of HP Estimation

Details: Accurate HP estimation helps in vehicle tuning, performance comparison, and verifying claimed power figures.

4. Using the Calculator

Tips: Enter the vehicle weight in pounds and 1/4-mile ET in seconds. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: It provides a rough estimate. Actual HP may vary due to traction, aerodynamics, and drivetrain losses.

Q2: Should I use curb weight or race weight?
A: For most accuracy, use the actual weight during the ET run (including driver and fuel).

Q3: What's a typical 5.825 constant?
A: This empirical constant relates ET to power-to-weight ratio for average vehicles.

Q4: Can I use this for motorcycles?
A: Yes, but results may be less accurate due to different power delivery and aerodynamics.

Q5: Does this calculate wheel or engine HP?
A: This estimates engine HP at the flywheel, not accounting for drivetrain losses.