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What's the Difference Between D Gear and S Gear in Automatic Transmission Cars?

1 Answers

JaceLee

07/29/25 11:52am

Automatic transmission cars mainly have the following differences between D gear and S gear: 1. Different main functions. S gear is the sports mode of the car; D gear is the most common gear in automatic transmission models, enabling the car to automatically select gears when moving forward. 2. Different characteristics. When using S gear, due to the high rotation speed, the engine's fuel injection volume changes, increasing the power. At the same time, the suspension becomes stiffer compared to normal conditions, reducing roll when cornering. D gear is one of the most common gears in automatic transmission models, belonging to a type of forward gear, covering all forward gears within the car's automatic transmission. 3. Different principles. In S gear sports mode, the transmission can shift freely, but the shifting timing is delayed, keeping the engine at high rotation speeds for a longer time, allowing the car to operate at low gear and high rotation speeds for an extended period, thereby obtaining greater torque output and acceleration; when the gearshift lever is placed in D gear, the hydraulic system control device will automatically connect the corresponding forward gear oil circuit based on the throttle opening signal and vehicle speed signal, automatically shifting up or down to the appropriate gear among the forward gears as the output shaft speed and engine speed change, achieving the automatic transmission function.

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