1. What is Wheel Horsepower to Engine Horsepower Conversion?

Definition: This calculator estimates engine (crank) horsepower based on measured wheel horsepower and drivetrain loss factor.

Purpose: It helps automotive enthusiasts and professionals estimate engine power from dyno measurements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( CHP \) — Crank Horsepower (engine power)
• \( WHP \) — Wheel Horsepower (measured at wheels)
• \( DTL \) — Drivetrain Loss factor (typically 0.12-0.15 for RWD)

Explanation: The formula accounts for power lost between the engine and wheels through the drivetrain.

3. Importance of Accurate Conversion

Details: Understanding true engine power helps in vehicle tuning, performance comparisons, and diagnosing drivetrain issues.

4. Using the Calculator

Tips: Enter your dyno-measured wheel horsepower and estimated drivetrain loss (default 0.15 for 15% loss). DTL must be between 0-0.5.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical drivetrain loss factor?
A: Typically 12-15% for RWD (0.12-0.15), 15-20% for FWD (0.15-0.20), and 20-25% for AWD (0.20-0.25).

Q2: Why is WHP different from CHP?
A: Power is lost through the transmission, differential, axles, and other drivetrain components.

Q3: How accurate is this calculation?
A: It provides a good estimate, but actual drivetrain loss varies by vehicle condition and setup.

Q4: Can I use this for electric vehicles?
A: No, EVs typically have much lower drivetrain losses (under 5%).

Q5: Where can I measure WHP?
A: WHP is measured on a dynamometer (dyno) at a performance shop or testing facility.