1. What is a Flywheel to Wheel kW Calculator?

Definition: This calculator converts flywheel horsepower (FHP) to wheel power in kilowatts (kW) accounting for drivetrain losses.

Purpose: It helps automotive engineers, mechanics, and enthusiasts determine the actual power delivered to the wheels after drivetrain losses.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_w \) — Wheel power (kW)
• \( FHP \) — Flywheel horsepower (hp)
• \( DTL \) — Drivetrain loss factor (0-1)
• 746 — Conversion factor from hp to watts

Explanation: The formula converts horsepower to watts, applies the drivetrain loss factor, then converts to kilowatts.

3. Importance of Wheel Power Calculation

Details: Understanding wheel power helps in vehicle performance tuning, comparing actual performance to manufacturer claims, and diagnosing drivetrain issues.

4. Using the Calculator

Tips: Enter the flywheel horsepower and drivetrain loss factor (default 0.15 or 15%). The DTL must be between 0 and 1.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical drivetrain loss factor?
A: For RWD cars: ~15%, FWD: ~10%, AWD: ~20-25%. This varies by vehicle and drivetrain condition.

Q2: Why multiply by 746?
A: 1 horsepower equals 746 watts - this converts mechanical horsepower to electrical watts.

Q3: How accurate is this calculation?
A: It provides a good estimate, but actual dyno testing gives precise wheel power measurements.

Q4: Can I use this for electric vehicles?
A: No, EVs typically have much lower drivetrain losses (around 5-10%).

Q5: Why convert to kilowatts?
A: kW is the standard metric unit for power and allows easier comparison with manufacturer specs in different regions.