Direct Shift Gearbox

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The DSG gearbox, also known as Direct Shift Gearbox, is an automated gearbox using a so called 'double clutch' introduced by Volkswagen AG. Audi uses for the same DSG gearbox the name S-tronic. Create new account. However, from 2003, a dual clutch six-speed Direct-Shift Gearbox (DSG) became available, with the United Kingdom TT variants becoming the world's first user of a dual clutch transmission configured for a right-hand drive vehicle, although the outright world first for a road car equipped with a dual clutch transmission was claimed earlier by a Volkswagen Group platform-mate, the left hand drive. Audi DSG (direct-shift gearbox) transmission problems have caused a lawsuit that alleges 2010-2014 Audi S4, S5, S6, S7 and RS5 vehicles are defective. The class action says the DSG transmissions cause sudden rough shaking and violent jerking when drivers accelerate and shift into 2nd, 3rd or 4th gear. Volkswagen’s direct-shift gearbox DSG 02E (see Figure 1) is used in the United States in some 2004-to-present New Beetle, New Jetta and Golf GTI models.It is a six-speed manual front-wheel-drive gearbox that is shifted automatically.

Advantages and Disadvantages

Advantages
  • Better fuel economy (up to 15% improvement) than conventional planetary geared automatic transmission (due to lower parasitic losses from oil churning) and for some models with manual transmissions;
  • No loss of torque transmission from the engine to the driving wheels during gear shifts;
  • Short up-shift time of 8 milliseconds when shifting to a gear the alternate gear shaft has preselected;
  • Smooth gear-shift operations;
  • Consistent shift time of 600 milliseconds, regardless of throttle or operational mode;
6-speed
Disadvantages
  • Achieving maximum acceleration or hill climbing, while avoiding engine speeds higher than a certain limit (e.g. 3000 or 4000 RPM), is difficult since it requires avoiding triggering the kick-down-switch. Avoiding triggering the kick-down-switch requires a good feel of the throttle pedal, but use of full throttle can still be achieved with a little sensitivity as the kick-down button is only activated beyond the normal full opening of the accelerator pedal.
  • Marginally worse overall mechanical efficiency compared to a conventional manual transmission, especially on wet-clutch variants (due to electronics and hydraulic systems);
  • Expensive specialist transmission fluids/lubricants with dedicated additives are required, which need regular changes;
  • Relatively expensive to manufacture, and therefore increases new vehicle purchase price;
  • Relatively lengthy shift time when shifting to a gear ratio which the transmission ECU did not anticipate (around 1100 ms, depending on the situation);
  • Torque handling capability constraints perceive a limit on after-market engine tuning modifications (though many tuners and users have now greatly exceeded the official torque limits.); Later variants have been fitted to more powerful cars, such as the 300 bhp/350Nm VW R36 and the 272 bp/350 Nm Audi TTS.
  • Heavier than a comparable Getrag conventional manual transmission (75 kg (170 lb) vs. 47.5 kg (105 lb));
  • Mechatronic units in earlier models are prone to problems and requires replacement units

Direct Shift Gearbox or DSG transmission is a type of manual gearbox designed to shift gears automatically without a clutch pedal. According to Volkswagen, this combination offers the comfort of an automatic transmission and high-efficiency of a manual transmission.

How does the DSG work?

The DSG transmission can complete its fast shifts with two separate gear shafts and clutches that are controlled by the mechatronic unit. The mechatronic unit combines the electronic unit and the electro-hydraulic control unit as a single component. The mechatronics is the central control module of the transmission.

Safety Mechanism

Direct Shift Gearbox

Volkswagen integrated a parking lock into the DSG transmission to ensure that a parked vehicle does not roll away. The parking lock is controlled by a connecting cable and is engaged by shifting the gear selector in the “P” position. It is an excellent practice always to activate the emergency-brake no matter what kind of transmission your car is equipped. Mitsubishi forklift cad download.

DSG Transmission Maintenance

The Direct Shift Gearbox is a partially sealed unit that does not have a dip stick to check the fluid level. Service intervals are needed every 40,000 miles. The new fluid will help lubricate the dual-clutch, shafts, bearings, synchronizer rings, and all the other related parts inside the transmission, and will allow the correct operation of the DSG unit.

Direct Shift Gearbox Vs Dual Clutch

It is essential to know that the DSG transmission is very different than a traditional Automatic transmission; therefore, they feel different when driving, especially at lower gears.
Please comment and let me know if you have any experience driving vehicles equipped with DSG transmission.
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Direct Shift Gearbox Oil

Direct shift gearbox vs dual clutch

Thank you for reading.