從4.8秒挺進至4.6秒，M-DCT確實了得！
※ M-DKG是德文用法，以下筆者皆使用英文M-DCT的講法。
BMW 蓄勢已久的雙離合器變速箱，終於推出亮相了，而且是"七段"自動變速。
雙離合器變速系統由於可以縮短換檔時間，不但比起BMW M3元配的六速手排加速更快，同時也能夠降低廢氣排放、節能性。譬如BMW M3配上M DCT後0-100加速從 4.8 秒挺進到 4.6 秒，但燃油消耗率依舊維持在8.4 km/l。
這套變速箱共有11種排檔模式可供使用，其中5種是自排模式，其餘的6種手排模式並加上BMW宣稱能夠完全發揮BMW M3 420匹的Launch Control program，我們十分期待想知道這套程式是否有如BMW所講的這麼好！(雙離合器這要請機械背景的人來解釋會比較清楚，不過雙離合器允許改變齒輪傳動比將能夠讓變速系統充分發揮引擎的特性)
BMW M-DCT雙離合器變速箱，顧名思意採用了兩組濕式離合器，其中一组和奇數檔相連，當偶數檔與動力輸出軸咬合的同時，奇數檔可以在旁邊先預備好隨時提供差使。簡單來講，這兩套離合器分別顧好偶數、奇數檔位，動力輸出軸再決定要和哪一組離合器要合。控制M-DCT的BMW Drivelogic系統提供許多不同的換檔模式，有像F1快速的換檔反應，也有適合一般公路巡航的舒適換檔模式。除了中控台外，方向盤有手撥式排檔裝置。
筆者以為，BMW 新M3配上M-DCT後將可大幅提升它的市場接受度，原本我預期本地AMG C63與BMW M3銷售量相比大約是4:1，BMW M3導入M-DCT之後應可拉進差距，銷量比大概2:1。M3本地的售價必須Cost Down，不然要有好成績~~~高難度！
↓首次出現在BMW M3上的雙離合器變速系統M-DCT
The new BMW M3 Coupe, Sedan and Convertible will be the first to feature BMW's latest technological achievement. The M DKG is a seven-speed double clutch transmission with BMW M's DriveLogic.
The new BMW M3 Coupe, Sedan and Convertible will be the first to feature BMW's latest technological achievement. The M DKG is a seven-speed double clutch transmission with BMW M's DriveLogic.
The new transmission is capable of even faster gearshifts which result in faster acceleration than the six-speed manual of the new M3, improved fuel economy and reduced emissions. The M3 coupe is capable of a 0 - 100 km/h time of just 4.6 seconds (0.2 seconds faster than the manual) while still using only 11.9 liters of fuel per 100 km.
The transmission comes with an wide array of program choices, 11 to be precise. Five shift programmes in fully automatic mode, six in manual mode which are supplemened by the Launch Control program which will provide maximum use of every last horsepower from the 4.0 liter V8 (309 kW / 420 hp). We will have to wait and see whether this Launch Control is as capable as BMW claims.
As the name says, the M DKG uses two clutches, both are oil-cooled, one is used for the uneven gears and reverse while the other is used for the even gears. One clutch is of course in use while driving, while the other is already pre-engaged. This is the big secret behind the double-clutch system, resulting in almost instantaneous gearshifts.
BMW's Drivelogic system is capable of several different shifting options, ranging from F1 style as-fast-as-possible gearshifts to luxurious and smooth gearshifts for boulevard cruising. The transmission can be used through either a sports selector lever in the center console or aluminium paddle-shifters on the steering wheel.
New BMW M3 owners will be happy to hear that the M DKG transmission is capable of taking some punishment on the racetrack.
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