1. What is Speed and Torque Calculation?

The speed and torque calculation helps determine vehicle performance characteristics based on engine RPM, tire size, and gear ratios. It's essential for automotive tuning and performance analysis.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• \( RPM \) — Engine revolutions per minute
• \( Tire\ Circumference \) — Distance traveled per tire revolution in inches
• \( Gear\ Ratio \) — Transmission gear ratio
• \( Final\ Drive \) — Differential gear ratio

Explanation: The equation calculates vehicle speed based on how fast the engine is turning (RPM) and how that rotation is translated to wheel movement through the drivetrain.

3. Importance of Gear Ratio Calculations

Details: Understanding speed and torque relationships is crucial for vehicle performance tuning, fuel efficiency optimization, and proper gear selection.

4. Using the Calculator

Tips: Enter RPM, tire circumference in inches, gear ratio, and final drive ratio. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How do I measure tire circumference?
A: Measure from the ground to the center of the wheel (radius), multiply by 2 to get diameter, then multiply by π (3.1416).

Q2: What's a typical final drive ratio?
A: Passenger cars typically range from 3.0 to 4.5, while trucks might be 4.5 to 6.0.

Q3: How does gear ratio affect speed?
A: Higher gear ratios (numerically lower) allow higher speeds at lower RPMs, while lower ratios (numerically higher) provide more torque but lower top speed.

Q4: Can I calculate torque with this?
A: While this calculates speed, torque can be estimated by considering engine torque multiplied by the gear ratios.

Q5: Why is tire size important?
A: Larger tires effectively change the final drive ratio, affecting both speed and torque at the wheels.