quattro permanent all-wheel drive (optional in the TT 2.0 TFSI*, standard in the TTS*) gives the compact sports car a powerful unique selling point in its segment. The latest-generation quattro drive is used. Audi has vigorously updated the electrohydraulic multi-plate clutch, which now uses software tailored to the TT and the TTS. Its slim design, which eliminates the pressure accumulator used in the previous generation, reduces the unit’s weight by 1.5 kilograms (3.3 lb).
The clutch is located at the end of the propshaft, in front of the rear axle differential – an installed position that benefits the axle load distribution. When the all-wheel drive software calls for torque, the electric axial piston pump develops up to 38 bar of hydraulic pressure. When the friction plates are pressed together, the torque is transferred steplessly to the rear axle.
The TT and TTS mark the first time that the all-wheel drive system has been integrated into the Audi drive select system. Its control philosophy strongly considers driving dynamics-relevant variables such as the steering angle while at the same time orienting on the status of Audi drive select and the electronic stabilization control (ESC).
Under this new, dynamic philosophy, the clutch can already begin sending a portion of the torque to the rear axle when the driver turns sportily into a corner. As soon as the driver steps on the accelerator, this torque presses the Coupé smoothly into the corner with no initial understeer. During load changes, the distribution of torque allows the TT to be turned precisely into the corner. When drifting on a low-friction road surface, it provides for maximum control and reliability. The front axle straightens the Coupé out again when exiting the corner. The multi-plate clutch works here in close conjunction with torque vectoring, an intelligent software function of the ESC.
Another focus during the development of the software was to increase efficiency. The control unit can compute the optimal distribution of torque with respect to efficiency based on the precise determination of the driving situation, road properties and driver type. In efficiency mode it can even be deactivated temporarily. Once the driving situation changes, quattro all-wheel drive is reactivated before torque is once again required at all four wheels. This concept reduces CO2 emissions by up to 1.5 grams per kilometer (2.4 g/mi).
The equipment, data and prices specified in this document refer to the model range offered in Germany. Subject to change without notice; errors and omissions excepted.