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M5 - E60 (2005 - ...) - 7-Speed SMG Gearbox

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M5 - E60 (2005 - ...)
7-Speed SMG Gearbox
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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 percent.
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 percent 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.

SMG for increased safety and comfort.
The seven-speed SMG gearbox not only supports the driver in achieving motor sports performance, but also offers scores of safety features. In critical situations, when the driver shifts down on a slippery surface, for example, the gearbox opens the clutch in the fraction of a second in order to prevent the M5 from swerving out of control in the event of excessive drag torque at the driven wheels. Further functions are the climbing, which prevents the car from rolling backwards during hill starts as well as the hill detection, which adjusts the shift points on gradients and descents. This prevents gear hunting when going uphill. When driving downhill, the hill detection holds the lower gears for longer in order to make effective use of the engine's braking power.

Maximum driving pleasure.
The interaction of the V10 engine and the seven-speed SMG gearbox results in a level of performance, which has so far been inconceivable for series-production saloons. Above all, there is one thing the M5 gives to its driver: driving pleasure at its best. Compared to the previous M5, the current model comes up trumps in all performance and fun disciplines: it accomplishes the 0 to 100 km/h sprint in 4,7 seconds and reaches the 200 km/h (124 mph) mark after a mere 15 seconds to go on to the electronically limited top speed of 250 km/h (155 mph). A glance at the speedometer reveals where this power package would head for if maximum speed was not electronically limited: an awe-inspiring 330 km/h (205 mph).

The Nürburgring serves as a test track.
Compared to all direct competitors, the interaction of actual forward thrust and a low vehicle weight is a strong argument in favour of the new M5. Also in this respect, the M5 sets the benchmark and leaves its competitors far behind.

An undisputed gauge of driving dynamics is the northern loop of the legendary Nürburgring race track. For decades, the world's most demanding race track has been the perfect place of separating the wheat from the chaff. There is no other place where the interaction of vehicle components when taken to the limits can be observed as well as on the Nürburgring's northern loop. With lap times of approximately eight minutes, the M5 can hold its own and is a worthy competitor of thoroughbred sports cars, leaving its competitors far behind. By the way: traditionally, all M vehicles are tested there.

Last Updated on Monday, 12 April 2010 14:37  

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