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Last year, we took an in-depth look at the Volkswagen Group's TSI engine family and how it was helping the German company and its sister brands achieve their goals.
So we thought that we'd have a look at another technology offered by most small or medium cars in the Volkswagen, SEAT, Audi and Skoda brands.
Many car companies have started to use double clutch gearboxes on mainstream cars these days, following the lead set by the Audi TT and the Mk4 Golf R way back in the early 2000s.
Volkswagen, the company that first decided one clutch was not enough, is also moving the game forwards.
To put it simply, all twin-clutch gearboxes work by separating the odd and even gears on individual shafts.
The advantage is that whichever gear you want to go to, up or down, it's already available on the other clutch.
DQ200More widely known as the 7-speed DSG gearbox, the DQ200 is different to the original BorgWarner unit. It was expected to go into every large VW model starting with the next generations of the Transporter and Multivan. Just like the DQ500, the two multi-plate clutches are bathed in oil, though the lubricant reaches a lower level and has reduced viscosity, which improves efficiency.
Modern automatics, like ZF's excellent 8-speed, shift just as well as twin-clutch units. The guide got a lot of attention and we were rather surprised to see some misconceptions are still floating around. For example, Korean car company Hyundai plans to introduce a 7-speed unit on models like the i30 and Veloster.

It has recently revealed a brand new 10-speed unit it says will go into production cars soon. They developed it for their famous racing prototypes and eventually brought it into production as the gearbox we know today as the PDK. The mecatronic unit disengages one clutch and pushes in the other one in one movement with almost instantaneous shifts happening.
If you own a Golf GTI, an Audi A3 with a 6-speed S tronic or a Skoda Octavia with a big engine, chances are it's one of those. It weighs 70 kilograms (150 lbs) and as far as we know, it's never been used on anything other than front-wheel drive cars.
Even then, engineers were thinking of something that could deal with a turbocharged 2.0L biturbo TDI. Due to an engineering flaw, it seems that electrolysis can occur within the gearbox's control unit.
It's also not true that DSG gearboxes are always more efficient than manual ones, though some are.
The Germans call it Doppelkupplungsgetriebe, but everybody else who doesn't join three words into one calls it the Direct Shift Gearbox, or DSG for short. Both Ford and Renault offer a 6-speed unit under the names PowerShift and EDC (Efficient Double Clutch), while Fiat and Alfa Romeo call it a TCT (Twin Clutch Transmission).
From the start, it was designed for lower torque applications and because it's also fitted to smaller cars, it needed to be lighter as well. Since its launch in 2008, the unit has found its way into two generations of VW Golf and one of the Polo, plus sister cars from SEAT (Ibiza and Leon), Skoda (Fabia II and III, Octavia II and III) and Audi (A1 and A3).

Even Lamborghini was forced to adopt this tech, a 7-speed twin being added to the Huracan supercar – LDF, which is short for Lamborghini Doppia Frizione. For years, the market was split between conventional automatics with torque converters, CVTs and single-clutch autos. DQ500In January 2009, six years after the original DSG, Volkswagen group came out with the pinnacle of twin-clutch tech, the DQ500. If you want to manually select the gear, the gearshifter gate has a special mode that lest you do that, just like on an automatic.
Audi had already launched the TT coupe based on the same platform and it decided a 3.2-liter V6 and a clever gearbox would be great for boosting sales. At that time it was heralded as the world’s only seven-speed transverse-mounted gearbox for high torques that is in large-scale series production. The auto was smooth but slow to react and thirsty, the CVT was efficient but weird to use and the single-clutch automated manual was jerky and unresponsive.
The gearbox feels more open, in that the difference between the highest and the lowest ratio is wide.
The gearbox was developed by BorgWarner and built by the VW Group's Kassel factory located in the heart of Germany. Because they are closer in drive ratio, there's less jumpiness when shifting, which some owners have complained about in the past.

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