What does the speed ratio of a car mean?

[VanPresley]

Car speed ratio refers to the transmission ratio of a car, which is the ratio of the rotational speeds of the two transmission mechanisms before and after the gearbox in the car's transmission system. Below is some content introduction about car speed ratio: The transmission ratio of a car's transmission system is divided into two types: the speed ratio of the main reducer and the speed ratio of the gearbox. The speed ratio of the main reducer is a fixed value, while the speed ratio of the gearbox varies depending on the gear used. The speed ratio data for various types of cars can be found in the car performance data manual. Extended content: Driving performance refers to acceleration, torque response of the power unit, noise, and vibration. Large-displacement engines provide greater, faster, and smoother torque responses. Front-engine front-wheel-drive transmission systems have better torque responses than front-engine rear-wheel-drive systems. 1. If the minimum transmission ratio is too small, the car will operate under heavy load, resulting in poor acceleration, noise, and vibration. 2. If the minimum transmission ratio is too large, fuel economy will be poor, and the engine will produce significant noise at high speeds.