BMW Media Information
1/2008 Page 9
Shifting gears without interruption of power: dynamic and comfortable. When it comes to driving dynamics, the seven-speed double-clutch transmission offers an advantage over seven-speed SMG already boasting an extremely fast gearshift by way of the change in gears now taking place without the slightest interruption of power and torque. In practice, this means even faster and more dynamic acceleration clearly measurable in seconds and metres.
The M double-clutch transmission is the only system of its kind able to offer the advantages of shifting gears without any interruption of power in combination with seven gears in a truly outstanding, high-performance car. The progress provided by this configuration comes to bear not only in the car’s driving dynamics, but also in its driving comfort and efficiency. The fast and smooth shift of gears, for example, ensures an unusually harmonious process of acceleration.
Precisely this is why the indicator needle in the rev counter is virtually the only sign of a change in gears when shifting in the automated mode. The load change reactions so typical of a conventional gearbox are avoided completely, ensuring a standard of driving comfort even under dynamic conditions never experienced before.
More gears, greater efficiency. Compared with a conventional automatic transmission, the M double-clutch transmission allows greater fuel economy and cleaner emissions on exactly the same engine with the same power. This is primarily attributable to the even more direct connection between the engine and the M double-clutch trans- mission as well as the general layout with seven gears. Quite simply, the advantage is that the larger number of gears allows even finer increments between the individual gear ratios.
With its overall gear spread of 4.8, the M double-clutch transmission with Drivelogic offers the appropriate transmission ratio in virtually every situation in everyday traffic. This again enables the driver to save fuel through an appropriate style of motoring, without making any concessions in terms of driving dynamics. For the M double-clutch transmission is able to provide the appropriate gear for fast and powerful acceleration at any time and with incredibly fast operation, even in response to sudden command.