What is the function of the S gear in an automatic transmission car?

[DelWilliam]

The function of the S gear in an automatic transmission car is: 1. In this mode, the vehicle's power performance is stronger, commonly used for overtaking, uphill driving, long downhill driving, traffic jams, and clearing carbon deposits; 2. The transmission can shift freely. The S gear is the car's sport mode, where the transmission can shift freely in sport mode, keeping the engine at high RPM for a longer time, allowing the car to drive at low gear and high RPM for an extended period, thereby obtaining greater torque output and acceleration. Situations where the S gear is not suitable include: 1. High-speed driving is not suitable for the S gear, as the S gear is set to downshift for speed increase, which can cause the vehicle speed and RPM to mismatch, increase noise, and raise fuel consumption; 2. Coasting is not suitable for the S gear, as it can cause significant wear to the transmission in a short time.

[LaAniyah]

The S gear is the sport mode for automatic transmission cars. I've tried it while driving an automatic, and the car feels much more powerful. The engine revs higher, and gear shifts are delayed, resulting in faster acceleration, making it super easy when climbing steep hills or overtaking, especially useful when you want to pass quickly on the highway. However, don't use it too often during daily commutes because the engine runs harder, significantly increasing fuel consumption—it's much more fuel-intensive than the normal D gear. Long-term use can also wear out the transmission or components, which isn't worth it. I recommend switching to it briefly only when you need temporary power, such as when driving on mountain roads or in urgent situations, and switching back to D gear afterward to protect the car. Don't rely on it too much while driving; safety comes first. Flexibly shifting gears according to road conditions is the best approach.

[StEmmanuel]

I have considerable experience using the S gear, and it feels like an acceleration booster. Once shifted into S gear, the engine responds more quickly, the shift points are delayed, and the car accelerates more aggressively, which is useful when in a hurry or climbing steep slopes. However, this mode isn't suitable for daily use, as it can cause fuel consumption to skyrocket and the car to overheat, affecting overall performance. I typically use it for mountain driving or when instant burst power is needed, such as overtaking slow-moving vehicles—switching to S gear allows for safer acceleration. For everyday city driving, staying in D gear is smoother and more worry-free. The key is not to misuse it, especially in rainy or slippery conditions, as sudden acceleration can cause skidding. Driving steadily is the way to go.

[LeRobert]

The S mode is quite useful in automatic transmission cars. I've noticed that it provides stronger power when driving. With higher engine RPM, the car accelerates faster, making it suitable for steep slopes or overtaking scenarios without feeling strenuous. Of course, it's not necessary for everyday driving as it increases fuel consumption and may accelerate component wear. For safe driving, ensure the road is dry and stable before switching to S mode to reduce the risk of skidding. Don't rush while driving; reserve it for emergencies when you need that extra boost.