DSG AND DCT: EXEDY EXPLAINS

What is a direct-shift gearbox (DSG) or dual-clutch transmission (DCT)?

Exedy says DSG transmissions, also known as twin-clutch transmissions, offer the best of automatic and manual transmissions; stating they are rapidly increasing in popularity and are available in a wide range of passenger and sports vehicles.
A direct-shift gearbox/DSG or dual-clutch transmission/DCT, as its name suggests, utilises two separate clutches in place of a singular item to transmit torque further along the vehicle’s driveline. It is essentially two clutches and two gearboxes in one car.
While the concept of a dual-clutch transmission dates back to the early 1900s, it wasn’t until the 1980s that significant advancements in electronic management allowed working examples and racing applications to be produced.
The first clutch is responsible for controlling gears one, three and five and the second clutch looks after gears two, four and six as well as reverse. This mechanism provides smooth shifting, similar to an automatic transmission, but with the efficiency of a manual transmission. The TCM (Transmission Control Module) determines which gear is selected.

Which cars use DSG transmissions?
Dual-clutch transmissions are becoming increasingly popular, and are available in a wide range of passenger and sports vehicles from carmakers such as VW, Audi, Ford, Renault, Kia and Hyundai.
DSGs can be found in anything from small compact passenger cars and motorcycles to hyper cars like the Bugatti Veyron and even larger commercial applications. What’s more, a large number of today’s vehicles are selling this concept as a new high-tech feature.

Do DSG transmissions have a clutch pedal similar to a traditional stick shift manual?
Dual-clutch transmissions are fully automated as opposed to manual transmissions, so there is no clutch pedal. The main difference between these and conventional automatic transmissions is that the two clutches are used in place of a torque convertor.
Unlike traditional transmissions, which use singular first motion shafts, a DCT has two concentrically arranged input shafts. These inner and outer input shafts are used to control drive to either odd or even gear sets (for example first, third, fifth or second, fourth and sixth gears).

What about the driving experience?
When driving, one gearset is engaged and delivering torque through the driveline, while the next gear ratio on the alternate set is preselected and ready for use. This preselection of ratios reduces the time required to engage the next gear and in turn, improves efficiency in the driving experience.

What other benefits do DSG Transmissions offer?
DSG transmissions are quicker to shift because the powertrain never gets disconnected from the transmission in contrast with manual or automatic transmissions. This process allows for faster gear changes and as a result, drivers experience improved acceleration.
Compared to most traditional automatic or manual transmissions, Exedy says DSG transmissions offer better fuel economy since they don’t employ a torque convertor.
What about the installation process?
When installing DSG clutch kits, Exedy explains it is essential to use the right tools, which are specific and expensive due to their superior quality and comprehensive features.
Exedy explains that it offers the free use of the toolset when you purchase a DSG clutch from Exedy.
When fitting a DSG clutch, another important consideration is the dual-mass flywheel.
Exedy’s recommendation is to always replace the dual-mass flywheel at the time the DSG clutch is replaced. The dual-mass flywheel fitting may vary from vehicle to vehicle, so Exedy suggests you consider the engine code and its torque output, as well as the number of teeth on the rim gear.
Exedy offers replacement clutch kits and flywheels for the most common Direct Shift Gearboxes (DSG) and specialised tool boxes for clutch replacement are available for loan with DSG clutch kits purchases (subject to availability; terms and conditions apply).

For more information, please visit www.exedy.com.au