- Feb 6, 2007
- 590
- 0
- 1,516
Modern automotive technology is getting so advanced, and the timeline for development so short that an item exclusive to the sacred province of the upper echelon of motorsport a few years ago can be found in economical hatchbacks today - quite literally. Volkswagen’s seven-speed Direct Shift Gearbox (DSG) transmission is just such a technology. Offering the best of both manual and automatic standard transmissions, the DSG dual-clutch transmission is now available in the VW Golf and Golf Plus with seven speeds.
For those not intimately familiar with VW’s DSG technology, the basic concept is relatively simple to grasp. Imagine a manual transmission, but instead of one gearset there are two - one for the even gears, another for the odds - and each has its own clutch. That clutch is computer controlled, as is the gear selection, so that while you are in second gear and accelerating, the computer has preselected third on the other gear shaft and only has to disengage the clutch from the active shaft and engage the clutch on the inactive shaft to change gears, allowing a seamless transmission of power between gears. It works in reverse for downshifts, with the computer handling the rev-matching as well. In the modern DSG, the two gear shafts are not side-by-side, but concentric, one outside the other. This allows for smaller packaging. If that doesn’t help much, check out this video of the DSG in action.
VW DSG : How It Works
[youtube]GyvjNuO-Yb4[/youtube]
The newest seven-speed gearbox (pictured above) going into the Golf and Golf Plus has two new features as well. In addition to being the first front-transverse installed seven-speed DSG, it is also the first to run dry clutches rather than immersing the clutches in oil. By running a dry system the newest DSG achieves even greater efficiency and can handle more torque - up to 250Nm (185ft-lb). The increased efficiency results in 0.7L/100km better fuel efficiency than its predecessor, the six-speed DSG (pictured at top of page) when paired with the 1.9L diesel motor. To help drivers get a start in hilly areas, all DSG-equipped Golf variants also come standard with hill-start assist, which holds the brake temporarily while the driver switches to the accelerator to prevent the vehicle rolling back as it would with a manual.
Initially the unit will be available on Golf and Golf Plus models with either the 90kW (120hp) 1.4L TSI petrol motor or the 77kW (103hp) 1.9L TDI motor. The optional installation of the new gearbox will start at €1,750.
Source:
Motor Authority » Volkswagen shifts Golf into high gear with 7-speed DSG
