Thread: Tranny News!!!
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      05-03-2007, 11:59 PM   #11
GregW / Oregon

Drives: 2015 M4 Coupe, 2012 ML350
Join Date: Nov 2005
Location: Lake Oswego, OR

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8-speed DCT

Originally Posted by Mii View Post
8-speed is for sport automatic. M3 is still being tested with 7-speed M-DCT. 8-speed is going to be trend given that Lexus LS460/600 and IS-F are using it. 8-speed also boosts fuel economy 6% more than 6-speed in similar application. The new ZF transmission has been designed with hybrid and all-wheel-drive in mind.

It won't be difficult for BMW to apply 8-speed M-DCT in future model, one clutch controls odd gears 1,3,5,7,R and other clutch controls even gears 2,4,6,8, looks fairly distributed from mechanical stand point.
I contend 8 speeds is too many for any manually-activated transmission. For an auto, fine, go 10, but if you have are expected to actuate the changes, 7 is about the limit until you are constantly flippin' levers.

Greg Lake Oswego, Oregon, USA
2015 M4 Coupe - Silverstone/Sakhir/CF
2012 ML350