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M6 Cabrio - E64 (2006 - ...) - Superior All Round

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M6 Cabrio - E64 (2006 - ...)
Muscular, sporting, elegant
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Superior All Round
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Superior All Round
Variable M Differential Lock.
From casual cruising with nothing but the sky above all the way to dynamic motoring in search of the last few seconds – no other open 2+2-seater offers the same wide range of driving opportunities as the BMW M6 Convertible. Simply because just the slightest movement of the gas paddle brings out all the motorsport DNA of the BMW M6, while at the same time this unique four-seater serves as both an exclusive and comfortable luxury convertible for the most discerning connoisseur. The unique driving experience offered by the BMW M6 Convertible comes from the combination of incredible refinement and running smoothness, on the one hand, and unparalleled dynamism and performance, on the other. In everyday traffic the BMW M6 Convertible merely needs to briefly indicate its supreme performance potential, the omnipresent supremacy of the car leaving no doubt about the unfathomable performance reserves naturally available at any time. The creation of such a multi-faceted character is attributable, not least, to the chassis and suspension specialists of BMW M GmbH: Developing the BMW M6 Convertible, they have created a car with a huge range of dynamic qualities ideal for both the most demanding race track such as the

of Nurburgring or serpentine mountain passes in the Maritime Alps, on the one hand, for casual cruising on Boulevard La Croisette, on the other, and, finally, for ultra-high speeds on the finish straight.


The suspension set-up – a masterpiece.
Focusing specifically on the BMW M6 Convertible, the engineers and suspension specialists at BMW M have chosen exactly the right spring, damper and anti-roll bar set-up offering the occupants all the sporting qualities of the car’s Coupé counterpart and the comfort of refined motoring in luxurious style. In the process of chassis and suspension development, therefore, the engineers have brought together the most contradictory demands and qualities – on the one hand truly impressive performance requiring a firm and sporting set-up, on the other hand relaxed cruising with the highest conceivable standard of suspension comfort. The chassis and suspension of the BMW M6 Convertible offers both: While direct feedback of road conditions contributes to the car’s sporting qualities in typical BMW M style, open-air cruising with smooth and even gentle road contact is a genuine, fully relaxing pleasure. In all, therefore, the BMW M6 Convertible is a masterpiece in suspension engineering – as firm as necessary in order to get all the 507 horses on to the road, and as comfortable as would befit a four-seater luxury cabriolet. At the same time the suspension is one of the lightest of its kind in the world – which is indeed highly important, considering that the Convertible inevitably weighs some 220 kilos or 485 lb more than the Coupé with its fixed roof lightweight body. But this additional weight comes largely at a point quite positive for the car’s driving dynamics, the engineers at BMW M succeeding in the design and construction of the Convertible in lowering the centre of gravity to an even lower point than on the BMW M6 Coupé: The specific arrangement of the roof bars and the electric motor for opening and closing the roof moves axle load distribution conveniently to the rear, with 49.8 per cent of the car’s overall weight resting on the rear axle. The power-to-weight ratio is equally impressive: Applying the DIN standard in calculating the ratio between vehicle weight and engine output, we establish a figure of 3.8 kg or 8.4 lb per horsepower in the BMW M6 Convertible. And so it is no surprise that the car’s lap times on the

of Nurburgring, where all BMW M models are put through their paces, are almost as fast as the lap times of the Coupé. Despite these race-like qualities, the driver and his passengers will experience the roadholding and driving characteristics of the BMW M6 Convertible as smooth, refined, and simply supreme: The suspension filters out any short and hard bumps resulting from bad road conditions with incomparable smoothness and style. All the feedback going to the customer is limited to the signals he needs in order to cope with the respective driving situation. In all, therefore, the Convertible offers truly outstanding roll comfort on all kinds of roads and surfaces, the driver benefiting from precise handling and enjoying truly unique motoring comfort at all times.

Less weight, high stiffness, precise handling.
With the exception of a few components subject to particularly high loads such as the tie-rods, wheel bearings or pivot points, the two-arm spring strut front axle of the BMW M6 Convertible is made completely of aluminium. The U-shaped front axle subframe takes up the steering mechanism, anti-roll bar, track control arms and thrust rods. A large aluminium panel gives the axle subframe maximum lateral stiffness and ensures particularly precise

response to the driver’s commands. It also features two NACA intakes feeding cooling air, inter alia, to the car’s transmission without in any way impairing the aerodynamic qualities of the underfloor. These slot-shaped air intakes tapering to the inside in order to enhance the flow of air were originally developed for aerospace requirements and are named after the National Advisory Committee for Aeronautics (NACA), the organisation which preceded NASA.


Servotronic with two control maps.
The steering system featured in the BMW M6 Convertible also meets all kinds of different requirements, Servotronic varying the degree of steering assistance via individual control maps as a function of road speed and engine revs. The result is a high level of steering assistance for smooth and comfortable manoeuvring as well as a supreme steering position keeping the car perfectly on track at high speeds. To the driver this means much easier parking, on the one hand, plus superior safety at high speeds, on the other, since the driver, benefiting from Servotronic, can hardly pull the steering too severely even in a sudden manoeuvre. Two Servotronic control maps corresponding to the EDC mode currently active maintain the same steering qualities and feeling at all times. Providing very direct steering qualities and equally direct, precise feedback to the driver, the sports control map nevertheless ensures highly dynamic, sports-oriented performance, while the comfort set-up ensures superior driving comfort and refinement particularly appreciated when motoring with the roof down.

The rear axle – perfect set-up and intelligent lightweight technology.
The integral IV rear axle is also made almost entirely of aluminium and offers the very best in terms of tracking stability and motoring comfort. Cooling fins on the aluminium cover of the final drive reduce temperatures within the final drive unit by up to 15 °C versus a conventional design, dramatically cutting back all thermal loads acting on the transmission. The final drive is connected to the SMG Sequential Manual Gearbox by a two-piece drive shaft featuring a Hardy disc at the front, an equidistant pivot arm at the rear, and a centre bearing. In the interest of minimum weight, the output drive shafts are a torsionally stiff, tubular structure.

Last Updated on Monday, 12 April 2010 14:37  

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