How to calculate Wheel Torque for Baja?

Calculating wheel torque in off-road vehicles involves considering several factors such as engine torque, gear ratios, transfer case ratios, axle ratios, and tire size. Here’s a step-by-step guide to help you calculate wheel torque:

1. Determine the engine torque: Start by finding the torque output of your vehicle’s engine. This information can typically be found in the vehicle’s specifications or technical documentation. Engine torque is usually measured in pound-feet (lb-ft) or Newton-meters (Nm).
2. Account for drivetrain losses: The torque measured at the engine is not fully transmitted to the wheels due to drivetrain losses. These losses can vary but are generally estimated to be around 15-20% for most vehicles. Multiply the engine torque by the drivetrain efficiency factor (1 – drivetrain loss percentage) to get the torque at the transmission output. Torque at transmission output = Engine torque × (1 – Drivetrain loss percentage)
3. Consider gear ratios: Determine the gear ratio of the transmission. This information can be found in the vehicle’s specifications or transmission documentation. Multiply the torque at the transmission output by the gear ratio to obtain the torque at the transfer case output. Torque at transfer case output = Torque at transmission output × Gear ratio
4. Account for transfer case ratios: If your off-road vehicle has a transfer case with multiple gear options (e.g., high range and low range), you need to consider the transfer case ratio. Multiply the torque at the transfer case output by the transfer case ratio to get the torque at the axle input. Torque at axle input = Torque at transfer case output × Transfer case ratio
5. Consider axle ratios: Determine the axle ratio for each axle in your off-road vehicle. The axle ratio can usually be found on a tag or plate attached to the axle housing. Multiply the torque at the axle input by the axle ratio to obtain the torque at each wheel. Torque at each wheel = Torque at axle input × Axle ratio
6. Account for tire size: The torque at each wheel also depends on the tire size. Larger tires can effectively reduce torque at the wheels due to the increased mechanical advantage. This is because the larger tires have a greater circumference, requiring more torque to turn them. However, if your off-road vehicle has a gear-driven transfer case or differential, the tire size effect is minimal.

By following these steps and considering all the relevant factors, you can calculate the estimated wheel torque for your off-road vehicle. Keep in mind that these calculations provide an approximation, and there might be additional variables and factors specific to your vehicle that could affect the actual wheel torque.