[cwg]

I have a couple of questions that I have not been able to find definitive answers to regarding the DCT.

1. Is the DCT in the 335is the same mfg and model as in the 135i?

2. Assuming they are the same - who makes it and what is the mfg's model number?

3. What are the specifications - particularly what is the tq rating for the transmission.

Thanks

[Alext]

I know in the Z4 Getrag make the unit according to the BT tool scan.

[The HACK]

Originally Posted by cwg

I have a couple of questions that I have not been able to find definitive answers to regarding the DCT.

1. Is the DCT in the 335is the same mfg and model as in the 135i?

2. Assuming they are the same - who makes it and what is the mfg's model number?

3. What are the specifications - particularly what is the tq rating for the transmission.

Thanks

According to RealOEM:

1. Part number 28007585538 (the dual clutch transmission) is the same part for the 135i, Z4 3.5i, and 335is.

2. "GS7D36SG," which is the model name for the transmission, means "G" for Getrag, S7 for 7 speed, and 36 for...

3. Nominal torque rating. It's good for up to 360 ft-lbs. Which is standard operating procedure for almost all manufacturers, they only specify transmissions with nominal torque rating as high as the max torque output for their engine (because to specify transmissions with higher nominal torque rating cost more).

According to my buddies who works for [name of transmission manufacturer withheld for their protection], the unspoken rule for the nominal rating for transmissions typically mean that that's the torque rating they tested the transmission for and can guarantee its sustained operation. Which means, the "max" torque it can handle can vary as much as anywhere from 25% more than the nominal rating to 50% more than the nominal rating, but it depends HEAVILY on the transmission design. For example, automatics can typically handle a lot more power increase than manuals. Transmissions with MORE gears will have less variable from the nominal rating than transmissions with fewer gears.

[Alext]

The 35is comes with 500nm / 370lb/ft from factory.

[cwg]

This is what I could find on the Getrag website:

GETRAG Powershift® 7DCI600 TRANSMISSION
Rear Wheel Drive, 7-speed, dual clutch transmission, wet


KEY BENEFITS

■Optimized efficiency

■Shifting without interruption of traction

■Excellent comfort

■Very quick and sportive shiftings possible


KEY FEATURES

Max. Torque Capacity 600 Nm
Weight (dry) 79 kg
Installation length 660 mm
Synchronization
1st, 2nd and 3th gear dual cone
4th and 5th gear single cone
6th, and 7th gear single cone
Reverse gear dual cone

Gear Spread Ratio 6,8
Max. Gross Vehicle Mass/Gross Trailer Mass 2500 kg/4500 kg
Shifter System hydraulic
Miscellaneous DCT dual clutch transmission


Thoughts as to if this is the one BMW uses?

[cwg]

Found this on the Getrag site also:

Press Release
Untergruppenbach, March 2nd, 2010
Geneva International Motor Show: Many novelties with GETRAG
Technology
Despite of a mixed outlook on the automotive year 2010, Drivetrain specialist GETRAG
looks satisfied in Geneva where the 80th Geneva Auto Show will take place from March 4th
to 14th. A broad range of vehicles debut in Geneva with GETRAG PowerShift® dual clutch
transmission technology.
Among others, the new Renault Mégane is equipped with the new GETRAG PowerShift®
transmission 6DCT250 with a dry dual clutch system. GETRAG PowerShift® Technology
can also be found in the BMW Z4 and the BMW135i Coupé and Convertible.


No model info given though

[Wads]

I'm still struggling to find anyone that can say whether the 335 DCT box shifts smoothly all the time..... seems like an obvious question but buggered if I can find the answer!!!

Is there ANY feeling when making a DCT shift or it it smooth transition up and down the box......

[Constant.S]

Depends which mode you have the transmission on Sport or Sport+ or Normal mode. This Transmission is very smooth, i can tell you that.