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The M double-clutch transmission - page 6 / 21





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BMW Media Information

1/2008 Page 6

This entire process takes only a few milliseconds, meaning that in the time even a skilled driver takes to press down the clutch pedal the M double-clutch transmission with Drivelogic has easily completed the entire process of shifting gears, continuing to accelerate in the next gear higher up.

Like in motorsport: dynamic torque peaks when shifting up, in-between gas when shifting down. With the process of engaging and disengaging the gears continuing in a smooth flow, the positive engagement connecting the engine to the transmission is not interrupted, allowing the driver to set off smoothly and comfortably and, in particular, to shift up at an incomparably fast speed. To provide an even more sporting driving impression and to further improve the car’s acceleration, the M double-clutch increases torque and pulling power to an even higher standard when shifting gears by means of the appropriately configured Drivelogic programs. In conjunction with the small increments between gears, these Drivelogic programs give the driver an even more intense feeling of acceleration, sensing each gearshift as the starting point for an even greater surge of power. The additional power generated in this way comes out clearly in the new transmission ratio feeding torque and traction to the drive wheels.

The combination of short gearshift times, small gear increments and the increase in torque gives the driver of a BMW M3 with an M double-clutch transmission a new, unprecedented experience of driving dynamics carried over directly from motorsport.

When shifting down the M double-clutch transmission works according to exactly the same principle. The only difference is that the electronic transmission control makes the process of engaging the clutch smoother and softer to prevent the rear wheels from being slowed down suddenly and with too great an effect.

Should the electronic control unit – for example when the driver is driving the car in an extremely sporting style or applying the brakes hard – recognise a very large gap in engine speed when changing gears, it will automatically adjust the transition of torque to the speed of the engine. This process of giving gas in between gears serves to further enhance the car’s driving stability and makes the entire driving experience even more intense. The drag force exerted by the engine comes out only to the extent desired by the driver, remaining within the limits already well known from cars with a manual gearbox.

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