Transmissions of the Audi TT MK1 (8N)

At the beginning of its production, the Audi TT was exclusively equipped with a manual gearbox. However, from September 2002, a tiptronic automatic gearbox was introduced on the 180 hp models, followed in July 2003 by the DSG automatic gearbox on the 250 hp models. Manual gearboxes were available in 5 or 6 speeds, depending on the engine and type of transmission.

The table below shows all available gearboxes depending on the engine and type of transmission:

Engine	150 hp	163 hp	180 hp	190 hp	225 hp	240 hp	250 hp
Front-wheel drive
02J - 5-speed manual gearbox
09G - 6-speed automatic transmission tiptronic
quattro
02M - 5-speed manual gearbox
02M and 02Y - 6-speed manual gearbox
02E - 6-speed automatic S tronic (DSG)

Compared to the standard version (A3), the 5-speed gearbox with front-wheel drive has a modified gear ratio, a reinforced differential with adaptation of the flange shaft and tripod joint bridge shafts.
The gear shift has been changed in the control shaft area (commissioning of the uniform cable control) and the gear lever has been adapted to the sporty performance of the TT.

The gearbox consists of three parallel shafts
- the input shaft,
- the output shaft
- the reverse shaft.

The primary and secondary shafts as well as the differential are housed in conical bearings. The 2nd report is doubly synchronized. The cogwheels and selection sprockets with helical teeth are constantly engaged and are engaged via synchronisation clutches. The 5th gear selector pinion is also placed on the primary shaft. The gear selector gears 1 to 4 are located on the secondary shaft.

The tiptronic is an automatic gearbox with torque converter. This is the most common type of automatic transmission, as it is very comfortable and able to handle high power.

The 09G automatic transmission has 6 hydraulically controlled front gears. When the direct clutch is closed, it is not subject to the sliding of the converter, which causes the mechanical drive of the 2nd, 3rd, 4th, 5th and 6th gears.

The torque converter is equipped with a direct plug clutch. The direct grip clutch closes depending on the load and speed. The 2nd, 3rd, 4th, 5th and 6th gears can be driven mechanically (without skating).

On the Audi TT, the total gear ratio is designed as a “sporting” box. The maximum speed is reached in 6th, while it is reached in 5th on the other models equipped with this same tiptronic box.
The 6th gear is used to reduce the stage of the gear shift and increases the driving dynamics.

The gearboxes consist of three parallel shafts:
- the input shaft,
- the output shaft
- the reverse shaft.

The 5 and 6 speed boxes on the quattros are virtually identical. The difference being that on the 5-speed gearbox, the 6e slipper pinion is removed and replaced by a spacer socket.

The use of magnesium as the housing material makes it possible to achieve, due to the lower density (2.695 g/cm3 for aluminium and 1.738 g/cm3 for magnesium) a 30% weight saving.

The "02M" and "02Y" types both refer to the "MQ350" transmission of VAG. The type "02M" seems to be a more generic name since it can designate a box 5 or 6 reports, with an optional transfer box, while the type 02Y specifically designates a box 6 reports with transfer box.

The S tronic 02E dual clutch box is also known as Direct Shift Gear (DSG) 02E. As the Audi automatic gearboxes all carry a designation followed by the -tronic suffix (tiptronic, multitronic), the name of the 02E double clutch gearbox was adapted to the Audi nomenclature and the box was renamed "S tronic".

The S tronic gearbox is both an automatic and a sporty mechanical gearbox. It has two clutches to change gear quickly and is controlled by an electrohydraulic control. During driving, one report is engaged and another is pre-selected. When changing gears, the active clutch opens and the other one closes simultaneously, allowing for near-permanent force transmission.

It offers fast and smooth speed changes, without power loss between changes and also allows drivers to quickly switch from manual to automatic driving.

Deliberately sporty dynamic behaviour goes hand in hand with high efficiency, making the S tronic more economical than a conventional mechanical gearbox under given driving conditions.