How does gear ratio effect performance?

[philo426]

[HomeRacingWorld]

Lower Gear Ratios: When the numerical value of the gear ratio gets larger, the gear ratio is said to decrease. For example, a gearing of 8-38 (4.75) is lower than 9-36 (4.0). Lowering the gear ratio will typically increase brakes and acceleration while decreasing top speed.

Higher Gear Ratios: When the numerical value of the gear ratio gets smaller, the gear ratio is said to increase. This is also referred to as using a taller gear. For example, a gearing of 11-38 (3.45) is higher (taller) than 10-36 (3.6). Higher gear ratios will typically increase top speed while decreasing brakes and acceleration.

[dr fabio]

You don't really provide enough information. What pinion are you running for each car? What is the weight of each car? What is the overall diameter of each of the rear tyres on the car? What is the torque of each of the motors? Assuming that both cars hook up and you dont have excessive wheel spin you should then be able to work out which car will accelerate faster.

Multiply the torque of the motor by the gear ratio. Then divide this number by the radius of the rear tyre. Then divide this number by the weight of the car. The bigger numbered value will accelerate faster.