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      10-24-2008, 01:00 AM   #1
Dartanium
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Drives: 09 E90 M3
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Additional DCT information

Hopefully this is not a repot but the copied post has quite a bit of useful informaiton regarding our new DCT unit.

Found on NAGTROC:



While looking for info on the GT-R's transmission fluids, I came across info for Porsche's new PDK and BMW's new M3 M DCT and Mitsubishi EVO's MR DCT transmissions. All are made by Getrag, and likely all using Borg Warner Dualtronic dual clutch modules, as used by the GT-R.

The GT-R's GR6 transmission is made by Aichi Kikai using four components made by Borg Warner, who helped design the transmission with Aichi Kikai, a subsidiary of Nissan.
Borg Warner GT-R DCT
"To create the exhilarating experience drivers anticipate in a premier sports car, BorgWarner worked closely with Nissan and its affiliate, Aichi Kikai, designing the transmission to incorporate four BorgWarner advanced DualTronic® technologies including the dual-clutch module, clutch control module, shift actuation module, and synchronizer assemblies. BorgWarner manufactures these components at its facilities in Arnstadt, Germany; Tulle, France; and Margam, United Kingdom. A leader in the globalization of dual-clutch transmission technology for ten years, BorgWarner's family of DualTronic® technologies combines the efficiency of a manual gearbox with the functionality of a fully automatic transmission, delivering seamless powerflow, improved fuel efficiency and a fun-to-drive experience. Customers include VW, Audi, Bugatti, SAIC, Nissan and Getrag dual-clutch transmission programs with five additional global automakers. In addition, BorgWarner is working on over 25 programs with transmission and vehicle makers around the world."

Borg Warner also helped design the fluid flow paths to maximize shift speed in the GT-R's GR6 DCT transmission.

Manufacture of the GR6 box started in October 2007: Aichi Kikai produces GT-R's GR6 transmission

Info on BMW's M CDT transmission: Borg Warner M3 DCT
"The BorgWarner DualTronic® clutch module is a critical component in the BMW M DCT Drivelogic developed and manufactured by GETRAG. The transmission is the world's first dual clutch transmission designed for conventional RWD inline vehicle configurations and was developed to match BMW's highest performance vehicles. The same transmission will later be used in other BMW 3-series vehicles.


With engine torque capacity of 600 Nm and engine speed capability to 9,000 RPM, the M DCT Drivelogic boosts the M3's 0-100 Km/h (0-62 mph) acceleration by 0.2 seconds over a standard manual gearbox. Potential fuel economy gains are 4% - 10% when compared with a traditional automatic transmission. A leader in the globalization of dual-clutch transmission technology for ten years, BorgWarner's family of DualTronic® technologies combines the efficiency of a manual gearbox with the functionality of a fully automatic transmission, delivering seamless powerflow, improved fuel efficiency and a fun-to-drive experience. Customers include VW, Audi, Bugatti, SAIC, Nissan and GETRAG PowerShift® dual-clutch transmission programs with five additional global automakers including BMW."

Here is a link with a mention of the launch control for the Porsche and M3 that use the DCT type transmissions:
First Look: PDK
"The move will see the 911 join direct rivals like Nissan's new GT-R (here in early 2009) and BMW's M3 M-DCT (due on sale this month) in offering a self-shifting sequential manual.

But while the BorgWarner-developed rear transaxle unit in the GT-R has six speeds, the 911 joins the M3's Getrag-sourced unit with seven – and also matches its launch control function, albeit as part of the optional Sport Chrono Plus package....

In Europe this year VW released a second-generation, seven-speed version of its acclaimed Direct Shift Gearbox (DSG; called S tronic by Audi), which continues to employ DualTronic twin-clutch technology first productionised by Detroit's BorgWarner. The first VW Group models to feature a seven-speed DCT in Australia will be Audi's new A4 and Skoda's new Superb, both due here in the first quarter of next year.

The same technology is also shared with German transmission rival Getrag, which in addition to co-developing the M3's seven-speed M-DCT with BMW, also supplies six-speed DCTs to Mitsubishi for its new Lancer Evo (due on sale in July), Chrysler for turbo-diesel versions of its Dodge Journey, Sebring and Avenger (here from September) and Ford/Volvo for some S40/V50 models not yet slated for Australia."

and a PDK video link to Porsche PDK official video:

BMW M3 DCT
"The new seven-speed double-clutch gearbox was developed specifically for the M3 with German transmission specialist Getrag in Germany and is a major step forward from BMW's previous single-clutch SMG (sequential-manual gearbox) units that first appeared in 1996 in the M3.

M3 drivers will be able to manually flatshift (without lifting the throttle) using either steering wheel paddles or the central gearshift, with BMW claiming seamless shifting and no interruption in power delivery.

Of course, dual-clutch transmissions are nothing new and are even available in humble VW Golfs, but developing a unit to handle high revs and massive torque outputs was quite another challenge.

The DCT effectively combines two gearboxes in one assembly that is no bigger than a conventional unit, yet contains two oil-cooled clutches – one controlling the even-numbered gears and other controlling the odd-numbered gears and reverse.

When driving, one of the two clutches is always engaged and, when accelerating or shifting down, the clutches are activated in an alternating fashion. An electronic control unit assesses which ratio is going to be the next required and pre-selects it, leaving the clutch open.

As soon as the driver activates the gearshift, it is instantly engaged. This entire process is completed faster than the time it takes a driver to depress the clutch pedal with the standard six-speed manual.

In full automatic mode, BMW's 'Drivelogic' control system provides five driving programs so the driver can select the shift characteristics (speed and revs) while a preferred setting can be stored and then recalled instantly by pressing a button on the steering wheel.

Like the previous SMG transmission, the DCT has a launch control function that allows the fastest possible acceleration away from standstill at the push of a button."

So from what I can tell, there are only three manufacturers of DCT tranmissions: ZF, Getrag and Aichi Kikai, and most use the Borg Warner dual clutch modules and other components. Pentosin makes fluids for many of them.
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