What is the S gear on an automatic transmission car?

[DianaMarie]

The S gear on an automatic transmission car is the sports mode of the vehicle. In S gear sports mode, the transmission can freely switch gears, allowing the engine to output greater power and achieve higher acceleration. An automatic transmission means that the driver does not need to manually shift gears; the vehicle will automatically select the appropriate gear based on the driving speed and traffic conditions. The principle of an automatic transmission is to use a planetary gear mechanism for shifting, which can automatically change gears based on the degree of the accelerator pedal and changes in vehicle speed. Situations where the S gear should not be used include: 1. Using the S gear when the car is just starting can have a counterproductive effect on speed increase; 2. It should not be used during high-speed cruising.

[AlainaLee]

I've been driving for nearly ten years, and the S gear is what we commonly refer to as the sport mode. The biggest difference from the regular D gear is the delayed upshift, allowing the RPM to climb much higher before shifting when you floor the accelerator. It's particularly useful for overtaking on highways or climbing steep hills without frequent gear changes that cause power interruptions. However, be aware that fuel consumption increases noticeably—using this gear in stop-and-go city traffic can show an extra 2-3 liters per 100 km. Additionally, transmission fluid temperature tends to rise more easily, so after half an hour of aggressive driving, it's best to switch back to D gear to let the system cool down. Many people think automatic transmissions only have PRND, but mastering the S gear can significantly enhance the driving experience.

[LaAdaline]

Last time I drove my friend's new car, I noticed this S gear, and he told me it's the Sport mode. Specifically, it keeps the engine RPM in a higher range, so even a light tap on the accelerator gives you a quick surge forward. I tried it on a mountain road when exiting a curve, and indeed, the power response was much faster, unlike in D gear where you have to wait half a second after pressing the pedal. However, this mode puts more strain on the transmission, and prolonged use might affect its lifespan. Moreover, the manual states that frequent use of Sport mode might trigger the transmission protection program, recommending not to exceed 20 minutes per session. It's really unnecessary for daily commuting unless you want to experience a bit of driving excitement.

[LunaDella]

The S mode in automatic transmissions serves a simple purpose: it enhances power response by altering the shift logic. The system keeps the engine above 2,000 RPM, reducing turbo lag and making acceleration more direct. Tests show a 0-100 km/h acceleration improvement of about 0.5 seconds, especially noticeable when overtaking. However, this mode significantly increases fuel consumption; at a steady 60 km/h, the RPM is 500 higher than in D mode. It's recommended to use S mode only when instant power is needed, such as overtaking on highways, and switch back afterward. Remember not to use this mode for towing, as it can easily cause overheating.

[DelPaige]

The essence of S mode is sport program control. When the transmission computer receives the command, it delays shift timing and downshifts in advance. For example, when accelerating from 80 to 100, D mode may shift twice, while S mode directly maintains third gear to complete the task. This mode makes the engine deliver power more briskly, but at the cost of increased noise and higher fuel consumption. On my car, the start-stop function automatically turns off when switching to S mode, indicating the system recognizes the increased load. It's important to note not to use S mode immediately after a cold start; wait until the coolant temperature is normal.