1. What is WHP?

WHP (Wheel Horsepower) is the actual power delivered to the wheels of a vehicle, calculated from the engine's brake horsepower (BHP) and the drivetrain efficiency.

2. How Does the Calculator Work?

The calculator uses the simple equation:

Where:

• \( WHP \) — Wheel horsepower (output at wheels)
• \( BHP \) — Brake horsepower (engine output)
• \( Efficiency \) — Drivetrain efficiency (typically 0.80-0.90 for RWD, 0.75-0.85 for FWD, 0.70-0.80 for AWD)

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

3. Importance of WHP Calculation

Details: WHP is crucial for understanding actual vehicle performance, as it represents the power that actually reaches the road rather than just engine output.

4. Using the Calculator

Tips: Enter BHP in horsepower (typically from manufacturer specs or dyno test) and drivetrain efficiency as a decimal (e.g., 0.85 for 85% efficiency).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between BHP and WHP?
A: BHP measures engine output before drivetrain losses, while WHP measures power actually delivered to the wheels.

Q2: What are typical drivetrain efficiency values?
A: Rear-wheel drive: ~85%, Front-wheel drive: ~80%, All-wheel drive: ~75%. Manual transmissions typically lose less than automatics.

Q3: Why is WHP lower than BHP?
A: Power is lost through friction in the transmission, driveshaft, differential, and other drivetrain components.

Q4: How accurate is this calculation?
A: It provides a good estimate, but actual dyno testing is needed for precise WHP measurement as efficiency can vary.

Q5: Does WHP change with modifications?
A: Yes, both engine modifications (affecting BHP) and drivetrain modifications (affecting efficiency) will change WHP.