1. What is Wheel Horsepower?

Wheel Horsepower (WHP) is the actual power that reaches the wheels after accounting for drivetrain losses. It's typically 10-20% less than engine horsepower (EHP) due to friction and other losses in the transmission, differential, and other drivetrain components.

2. How Does the Calculator Work?

The calculator uses the WHP formula:

Where:

• \( WHP \) — Wheel horsepower (output at the wheels)
• \( EHP \) — Engine horsepower (measured at the crankshaft)
• \( \text{drivetrain loss} \) — Power lost in the drivetrain (typically 0.10-0.20 for 10-20%)

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

3. Importance of WHP Calculation

Details: WHP is crucial for understanding actual vehicle performance, as it represents the power that's truly available to move the vehicle. It's more relevant than engine horsepower for performance tuning and comparisons.

4. Using the Calculator

Tips: Enter engine horsepower (EHP) and estimated drivetrain loss (typically 0.15 for 15% loss). Common drivetrain losses are 10-15% for front-wheel drive, 15-20% for rear-wheel drive, and 20-25% for all-wheel drive vehicles.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between WHP and BHP?
A: BHP (brake horsepower) is measured at the crankshaft (like EHP), while WHP is measured at the wheels after drivetrain losses.

Q2: How accurate is this calculation?
A: It provides a good estimate, but actual drivetrain loss varies by vehicle and condition. For precise measurements, dyno testing is recommended.

Q3: Why do AWD vehicles have higher drivetrain losses?
A: AWD systems have more components (additional differentials, transfer case) which create more friction and power loss.

Q4: Can drivetrain loss change over time?
A: Yes, worn components can increase losses, while improved lubrication or upgraded parts may reduce them slightly.

Q5: Is WHP always better for performance comparisons?
A: Generally yes, but for engine-specific comparisons (not vehicle performance), EHP/BHP may be more appropriate.