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M6 Cabrio - e64 (2006 - ...) |
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Page 4 of 8 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
Nordschleife
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
Nordschleife
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
BMW
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.
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