![What is S Tronic? The gearboxes features and technical parameters](https://innovationdiscoveries.space/wp-content/uploads/2022/07/What-is-S-Tronic-The-gearboxes-features-and-technical-parameters-1140x641.jpg)
The S tronic dual-clutch transmission is a successful technology.
It combines the convenience of an automatic with the efficiency of a manual transmission while adding its own dynamic touch.
Throughout much of the model line-up, the S tronic is available in four different versions, with six or seven gears.
For longitudinally installed engines, Audi has developed a special version of the seven-speed S tronic in which the gear wheels for all gears are situated one behind the other on an output shaft.
The three versions for transversely installed engines are configured in a single layout with two output shafts, allowing a compact design.
The S tronic for transverse engines is available with six or seven gears.
The seven-gear S tronic itself has two versions. Which version is used with which engine depends on the amount of torque to be transmitted.
The following is a description of the seven-speed S tronic for longitudinal engines;
However, the basic principle is the same for all designs.
The S tronic comprises two subunits and integrates two multi-plate clutches that control the various gears.
The large K1 clutch located on the outside directs the torque via a solid shaft to the gear wheels for the odd-numbered gears 1, 3, 5 and 7.
A hollow shaft rotates around the solid shaft.
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It is connected to the smaller K2 clutch, which is integrated into the inside of its larger sibling, and which controls the gear wheels for the even-numbered gears 2, 4 and 6, as well as the reverse gear.
Both transmission structures are continuously active, but only one is connected to the engine at any one time.
![What is S Tronic? The gearboxes features and technical parameters](https://innovationdiscoveries.space/wp-content/uploads/2022/07/s-tronic-1140x641.jpg)
For example, when the driver accelerates in the third gear, the fourth gear is already engaged in the second transmission structure.
The shifting process takes place as the clutch changes – K1 opens and K2 closes.
Shifting gears takes only a few hundredths of a second and is completed with almost no interruption of traction.
It is so smooth, dynamic and comfortable that the driver barely notices it.
The mechatronics module, a compact and robust block, comprises the electronics along with the hydraulic control elements.
Its control concept allows it to vary the speed of the gear-shifting process and to precisely control the necessary power.
The multi-plate clutches are managed with extreme precision; the seven-speed S tronic is responsive even in stop-and-go traffic and during maneuvering.
![What is S Tronic? The gearboxes features and technical parameters](https://innovationdiscoveries.space/wp-content/uploads/2022/07/post-1140x641.jpg)
The seven-speed S tronic can be used in a number of ways.
Automatic mode has two programs: D (Drive) and S (Sport).
The driver can take control of the shifting via the selector lever or with the standard paddles behind the steering wheel.
Another feature of the high-performance models is the launch control system, which fully exploits the car’s acceleration potential.
The sporty seven-speed S tronic for longitudinal engines can handle engine speeds of up to 9,000 rpm.
All versions of the S tronic offer a number of strengths: high efficiency, intelligent management and a large gear ratio spread with very wide top gears.
Thus the high-tech transmission delivers lower fuel consumption in many cases compared with a manual gearbox.
The ultra-compact seven-speed S tronic in the A1* and A3 weighs only about 70 kilograms (154.32 lb).
Their two dry clutches do not need a separate oil supply, adding further to their efficiency.
All versions of the S tronic can be combined with the Audi start-stop system.
*Audi A1 Combined fuel consumption in l/100 km: 7.1 – 3.8; Combined CO2-emissions in g/km: 162 – 99
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Source – Audi-Technology-Portal