SMG Gearbox on M3... why not, wtf?

[_LoHaN_]

I'd like to know why BMW won't use SMG on new M3?!

A 6-speed gearbox seems so poor...

[Mr.Marvelous]

They'll put something better than the SMG in March 2008...

patience...

[_LoHaN_]

And what can it be?

Do you know something?

Where can I read about it?

[esquire]

Originally Posted by _LoHaN_

And what can it be?

Do you know something?

Where can I read about it?

search for DSG, ZSG, or DCT.... all names which have been used to refer to bmw's new dual clutch transmission available for the new m3

[Steved]

Read this thread

http://www.e90post.com/forums/showthread.php?t=55395

It's all in the name of progress, but I will reserve judgement until I have tested it for myself.

[GregW / Oregon]

Originally Posted by _LoHaN_

And what can it be?

Do you know something?

Where can I read about it?

Here's an explanation of Audi's DSG:
http://cars.about.com/od/thingsyoune...owDSGworks.htm.

BMW's is sure to be similar--rumored to be a 7-speed made by Borg Warner.

[Steved]

Originally Posted by GregW / Oregon

BMW's is sure to be similar--rumored to be a 7-speed made by Borg Warner.

No, SMG is being replaced by Getrag's new DCT transmission (see post above.)

[posterchild336]

go to youtube and type dsg and look at what the golfs have, it seems much better than smg

[ilmor]

SMG, DSG, whatever...that's what I want. I'm not planning to buy my next M3 until the fall of '08, so perhaps it will be available by then. I hope so.

[epiphone3]

Originally Posted by Steved

No, SMG is being replaced by Getrag's new DCT transmission (see post above.)

Its strange that you say Getrag because it seems to me that all the information I have about the 7-speed DCT is from ZF Sachs. See a few threads down and there is a thread with a link to a description and animation. Dual wet clutches is very cool!

[_LoHaN_]

I wanna to change my car for a new m3, but not with that Manual Transmition...

I'll wait untill this knew gearbox comes out.

[GregW / Oregon]

Originally Posted by Steved

No, SMG is being replaced by Getrag's new DCT transmission (see post above.)

Good info. I found this on the Getrag website:



KEY BENEFITS

- Optimized efficiency
- Shifting without interruption of traction
- Excellent comfort
- Very quick and sportive shiftings possible

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 dual cone
Reverse gear single 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

http://www.getrag.de

Click on Transmissions/Dual Clutch Transmissions, then from the popdowns on the right DCT/Inline/Over 400 NM Torque

[E36325is]

Awesome! Gladly waiting for mine!

[Steved]

Originally Posted by epiphone3

Its strange that you say Getrag because it seems to me that all the information I have about the 7-speed DCT is from ZF Sachs. See a few threads down and there is a thread with a link to a description and animation. Dual wet clutches is very cool!

ZF have been the main transmission partner to BMW for many years, but they banked on the AMT style transmission (i.e. SMGII and SMGIII) and the technology battle has now shifted to DCT.

Gertag are ahead of ZF in this DCT technology race and that's who BMW have chosen for the new M3, so ZF are now playing catchup but will not have a competitive transmission available I believe until 2009.

These new DCT transmissions can handle considerably more torque than the early Borg Warner designed systems as fitted to VW/Audi, so I am expecting Gertag's DCT system to be far better than those we have previously experienced on the Golf GTi. Should be interesting to find out.

Here are a few more articles describing why SMG is being replaced with DCT

http://www.zeroshift.com/pdf/EAC906%2013.pdf

http://newsletter.csmauto.com/4thQtr2005/?a=2