Quote:
Originally Posted by MPBK
Thanks, Lee.
Looks like DCT technology has a lot of room to improve. There's no reason why it can't be more efficient than a manual, like the Steptronic is now.
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So the DCT 135i has a 2.56 ratio and not the 3.46 posted on BMWUSA.com. BTW, the 335i with Steptronic has a 3.46 FD which makes sense as both 5th and 6th are overdrives.
But I disagree that the Steptronic is more efficient than the manual as they have identical mpg ratings for the 128i coupe (18/28) and the MT is significantly quicker from 0~60 - by more than a half second.
http://www.bmwusa.com/Standard/Conte...fications.aspx
But the question of why the DCT gets such poor gas milage when mated to the x35i motor remains...
And for what it's worth, the only M car available with the DCT will be the upcoming M5. The 1M, and M3 are 6sp manuals and the M-trucks (X5M and X6M) have only the 6 speed Steptronic.
Tom