Rear Wheel Torque Calculator For Cars

Rear Wheel Torque Formula:

\[ \text{Rear Torque} = \text{Engine Torque} \times \text{Gear Ratio} \times \text{Drive Ratio} \]

Rear Wheel Torque:

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1. What is Rear Wheel Torque?

Rear wheel torque is the rotational force delivered to the wheels of a vehicle. It's calculated by multiplying the engine torque by the gear ratio and final drive ratio, representing the actual force that propels the vehicle forward.

2. How Does the Calculator Work?

The calculator uses the rear wheel torque formula:

\[ \text{Rear Torque} = \text{Engine Torque} \times \text{Gear Ratio} \times \text{Drive Ratio} \]

Where:

\( \text{Engine Torque} \) — Maximum torque output from the engine (N·m)
\( \text{Gear Ratio} \) — Transmission gear ratio (unitless)
\( \text{Drive Ratio} \) — Final drive/differential ratio (unitless)

Explanation: The formula accounts for torque multiplication through the vehicle's drivetrain system, showing how much force actually reaches the wheels.

3. Importance of Rear Wheel Torque Calculation

Details: Calculating rear wheel torque is essential for understanding vehicle performance, acceleration capabilities, towing capacity, and overall drivetrain efficiency. It helps in comparing different vehicle configurations and tuning performance.

4. Using the Calculator

Tips: Enter engine torque in N·m, gear ratio (typically between 2.0-4.0 for most gears), and final drive ratio (typically between 2.5-4.5). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is rear wheel torque important?
A: It determines the actual force propelling the vehicle, affecting acceleration, hill-climbing ability, and towing performance more directly than engine torque alone.

Q2: How does gear ratio affect rear wheel torque?
A: Lower gear ratios (higher numerical values) multiply torque more, providing greater acceleration at the expense of top speed.

Q3: What's a typical final drive ratio?
A: Most production cars have final drive ratios between 3.0 and 4.0, with performance and towing vehicles often having higher ratios.

Q4: Does this calculation account for drivetrain loss?
A: No, this is a theoretical calculation. Actual wheel torque is typically 10-20% less due to drivetrain friction and inefficiencies.

Q5: How does rear wheel torque relate to horsepower?
A: Horsepower = (Torque × RPM) / 5252. While torque determines acceleration force, horsepower determines how long that force can be maintained.