World Premiere Of The New BMW M5 | Part Four

New BMW M5

BMW 5 Series

Seven-speed SMG gearbox conveys M power to the tarmac

The high-revving concept only succeeds in combination with a gearbox which translates the torque available to the engine, by means of a short overall transmission ratio, into optimised forward thrust.

The seven-speed SMG gearbox is precisely the right transmission to ideally convey the V10 engine's power via the drive train to the wheels. BMW M is the first manufacturer worldwide to offer a seven-speed sequential gearbox with drivelogic function. Even more highly perfected than the previous six-speed transmission, the seven-speed SMG gearbox enables manual gear selection with ultra-short shifting times as well as comfortable cruising thanks to automated gear selection. The purpose of the additional seventh gear is to reduce engine speed and torque gaps.

New SMG gearbox's speed up by 20 per cent

With the seven-speed SMG gearbox, gears can be changed using the gearshift lever on the centre console or the paddles on the steering wheel. Compared to the previous SMG transmission, changing gears is 20 per cent faster with the new SMG generation. Never before has it been quicker to change gears with a transmission of this kind. The advantage for the M5 driver: Gear change is smooth and accomplished at a speed impossible to reach even by the most proficient driver, thus making the inevitable power flow interruptions when changing gears hardly noticeable. The M5 delivers an almost jerk-free performance when accelerating from a standstill to its top speed.

Drivelogic: The driver determines the SMG's characteristics for changing gears

Thanks to the SMG's drivelogic function, the driver can choose from eleven gear change options, which enable him to adapt the SMG's characteristics to his very own style of motoring.

Six of these programs can be pre-selected in the sequential manual gearbox mode (S mode), the spectrum ranging from balanced dynamic to very sporty. With the gearbox in the S mode, the driver always shifts gears manually. Whenever the driver activates the Launch Control function, the SMG Drivelogic shifts gears shortly before the maximum engine speed is reached at precisely the right moment and with optimum slip until the M5 reaches its top speed.

In the Drive (D mode) automatic gearshift mode, the transmission shifts the seven gears automatically, depending on the program selected, the driving situation, the road speed and the position of the accelerator pedal.

continues... | Part Five
Published 16 September 2004 Melanie Carter

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