S gear is the sport mode of a car ("S" stands for "sport"). Many automatic transmission cars are equipped with an S gear, and some high-end models of A-segment cars also feature this design. In S gear sport mode, the transmission can shift freely, but the shifting timing is delayed, allowing the engine to maintain higher RPMs for a longer period. This enables the car to operate at lower gears with higher RPMs for extended durations, resulting in greater torque output and acceleration. More details are as follows: 1. While driving, simply push the gear lever into the "S" position. This is typically used for climbing hills or quick overtaking. 2. Generally, regular automatic or CVT models keep the RPM around 2000, but S gear delays the shift timing until the engine operates at its optimal performance. For vehicles equipped with paddle shifters, the RPM can even reach the redline. 3. When using S gear, the increased RPM changes the engine's fuel injection, enhancing power output. Additionally, the suspension becomes firmer compared to normal mode, reducing body roll during cornering and minimizing brake dive. However, comfort is somewhat compromised in S gear mode. 4. Since S gear only delays upshifting without altering other operational aspects, it inevitably increases the transmission's load in the short term, raising its temperature and accelerating wear. Therefore, prolonged use of S gear is not recommended. 5. In terms of fuel consumption, S gear mode consumes significantly more fuel than normal mode due to the increased fuel injection at higher RPMs. However, there are benefits to using S gear. For cars frequently driven in congested urban areas, engine carbon buildup is common. Periodically using S gear helps remove carbon deposits, improving fuel economy and extending engine life.
