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 crank horsepower (CHP) due to power loss through the transmission, differential, and other drivetrain components.

2. How Does the Calculator Work?

The calculator uses the WHP formula:

Where:

• \( CHP \) — Crank horsepower (engine output)
• \( Drivetrain\ Loss \) — Percentage loss through drivetrain (as decimal)

Explanation: The equation accounts for power lost between the engine and wheels due to mechanical friction and other factors in the drivetrain.

3. Importance of WHP Calculation

Details: WHP represents the actual power available to move the vehicle, making it crucial for performance measurements, tuning, and comparing real-world vehicle performance.

4. Using the Calculator

Tips: Enter crank horsepower in hp and drivetrain loss as a percentage (typically 10-20% for most vehicles). All values must be valid (CHP > 0, loss between 0-100%).

5. Frequently Asked Questions (FAQ)

Q1: What's typical drivetrain loss for different drivetrains?
A: Front-wheel drive: 10-15%, Rear-wheel drive: 15-20%, All-wheel drive: 20-25%.

Q2: Why measure WHP instead of CHP?
A: WHP represents the actual power reaching the wheels that moves the vehicle, making it more relevant for real-world performance.

Q3: How is WHP measured?
A: WHP is typically measured on a dynamometer (dyno) by applying resistance to the driven wheels.

Q4: Can WHP be higher than CHP?
A: No, WHP is always less than or equal to CHP due to inevitable drivetrain losses.

Q5: Does drivetrain loss change over time?
A: Yes, as components wear, loss may increase slightly. Proper maintenance helps minimize additional losses.