8 - Speed Tiptronic S
8 - Speed Tiptronic S
The 8-speed Tiptronic S (optional for Cayenne, standard for all other Cayenne models) is a new transmission that reliably transfers the high power output and torques of all Cayenne models. Needless to say, the transmission performs fast shift operations and ensures a high degree of efficiency as well as outstanding shifting and driving comfort.
The new Tiptronic S is noted for the following characteristics:
- 2 additional gears as an overdrive
- Auto Start Stop function
- Thermal management
- Quicker response and shifting times
An increased gear spread was required for the new 8-speed transmission to achieve a clearly noticeable reduction in fuel consumption compared to the previous model without the performance being affected. The powerful high-torque engines on the Cayenne models provide the perfect platform for designing a new transmission. It was therefore possible to fully utilize the 20 % increase in the gear spread and design the additional gears in the form of so-called overdrive gears.
NOTE:
Transmission types
Cayenne A55/04
Cayenne S A48/04
Cayenne Turbo A48/54
These two additional gears give the option of a wider transmission spread, which would offer the following advantages:
- Low engine speeds in the high speed range to reduce fuel consumption and lower noise levels
- Good drive-off characteristics and sufficient reserves of power in first gear for excellent climbing and pulling power
- Optimized shifting programs for speed ranges that are ideal for the required engine torque
A larger overall spread compared to the 6-speed transmission ensures that the engine runs within the best operating range at all times. The engine speed is reduced by 20 % in seventh and eighth gear, which makes a decisive contribution to reducing the fuel consumption during long trips. The new 8-gear Tiptronic S always starts the drive-off process in first gear to achieve the best starting performance. Top speed is reached in 6th gear.
Based on the design of the current proven version of the 6-gear Tiptronic S, the addition of a shifting element in the transmission paved the way for the integration of two additional gears. It was then possible to limit the space requirements of the new transmission to those of its predecessor - the installation length of the 8-gear transmission is identical to that of the 6-speed gear, for example.
The improved power-to-weight ratio of the transmission and the detailed optimisation of individual transmission components have also contributed to the overall increase in efficiency. For example, considerably more powerful vibration dampers on the torque-converter lockup clutch allow the engine to operate at lower speeds with the torque-converter lockup closed in order to increase fuel economy and guarantee a high degree of driving comfort.