What is the difference between D and S in automatic transmission?
1 Answers
The difference between D and S in automatic transmission: 1. The automatic control logic for gear shifting is different: D gear is oriented towards comfort and economy; S gear is performance-oriented. 2. The gears are different: D gear is the forward gear, where the hydraulic system control device shifts up or down according to the preset program, and you only need to step on the accelerator; S gear is the sport gear, when engaged, the hydraulic system can only connect to the first or second gear in the forward gears and cannot engage higher gears, resulting in delayed upshifting. When in S gear, the fuel injection volume is higher at high RPMs, which inevitably increases the car's fuel consumption. Although it can provide instant acceleration, this gear is mostly used during overtaking. Essentially, this gear delays upshifting without altering other operational aspects, thereby placing a greater load on the transmission and causing wear to the transmission system.