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M6 Cabrio - e64 (2006 - ...) |
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Page 5 of 8 M Differential Lock for extra safety and driving pleasure.
The final drive features BMW’s Variable M Differential Lock. Whenever
required, this unique drive unit is able to generate up to 100 per cent locking
action, optimising both driving stability and traction particularly when
accelerating out of a bend, for example when one of the drive wheels is about
to lock. Whenever the driver prefers a more sporting and dynamic style of
motoring and on roads with a high frictional coefficient, the M Differential Lock
also enhances the positive qualities of rear-wheel drive, thus offering extra
safety and driving pleasure at all times.
On a conventional, torque-sensing differential lock the overall drive force and
engine power conveyed to the road depends on the traction maintained by the
wheel with the lowest level of friction on the road surface, that is the wheel
slipping most. Clearly, this often limits traction most significantly particularly on
snow, gravel or ice. The engine speed-sensing Variable M Differential Lock,
on the other hand, gives the car a decisive increase in traction even on road
surfaces varying most significantly in their frictional coefficient – in extreme
cases even conveying all the power and momentum of the engine via the
wheel with the better frictional coefficient.
Clearly, this gives the BMW M6 Convertible unusually good driving qualities in
winter, the Variable M Differential Lock immediately building up increasing
locking action between the drive wheels with an increasing difference in wheel
rotation speed. This means that a wheel no longer conveying the full power
of the engine – for example the inner wheel in fast bends – does not lead to a
complete reduction of drive forces in an attempt to prevent the wheel from
spinning. Instead, locking action is always controlled individually as required
and drive power as well as traction are suitably maintained at all times.
DSC in M Configuration for enhanced safety.
The chassis and suspension of every BMW M model ensures superior
dynamism and safety under all kinds of everyday driving conditions.
Exceptional situations reaching the very limits of driving physics, in turn, are
handled and optimised by BMW Dynamic Stability Control (DSC) permanently
monitoring the car’s driving conditions and intervening whenever necessary
in engine management in order to reduce drive forces or activate the brakes
on a specific wheel. DSC thus enhances driving safety for example on a
slippery road, in abrupt manoeuvres, or with the car threatening to lose stability
in a bend.
In the BMW M6 Convertible DSC Dynamic Stability Control is perfectly
tailored to the car’s weight and centre of gravity. It also incorporates a specific
M configuration enabling the driver to choose various dynamic driving
programs by means of the special MDrive control unit. So while the first stage
of DSC is fundamentally the same as on the BMW 650i Convertible,
the M Dynamic Mode (MDM) caters for the sports-minded, truly ambitious
driver. Indeed, this exclusive, supplementary function offers the sports
motorist an entirely new dimension of driving dynamics, allowing him to enjoy
the car’s maximum straight-ahead and lateral dynamics simply at the touch
of a button on the MDrive control unit.
Enjoying this exclusive option, the driver will really experience the utmost limits
of driving physics, DSC not intervening until the car reaches the ultimate
point on the road and thus allowing the driver to handle the greatest possible
power slide by slight countersteering on the steering wheel.
A warning signal in the instrument panel tells the driver that the
M Dynamic function is active. And last but not least, the driver is able
to completely deactivate DSC, as on all BMWs.
Power button for individual control of engine characteristics.
Last but certainly not least, the BMW M6 Convertible also reveals its supreme
qualities in fast but relaxed motoring. In other words, the driver does not
always require all the power of the V10 in order to enjoy exceptional driving
pleasure under all conditions. Precisely this is why the extra-comfortable
P400 performance program is automatically activated when starting the
engine, offering initial engine power of 400 hp. Then all the driver has to do is
press the MDrive button on the steering wheel or the Power button on the
selector lever cover in order to enjoy the full 507 hp developed by the engine,
with the gas pedal kinematics becoming even more responsive and
spontaneous, ensuring extremely sporting and dynamic driving pleasure
in the P500 program and, even more so, in the P500 sports program.
EDC Electronic Damper Control: from sporting and firm all the way to comfortable and smooth.
EDC Electronic Damper Control provides permanent, infinite electronic
adjustment of the dampers. Simply pressing the MDrive button, the driver is
able to choose the characteristics of the suspension in three steps from
sporting and firm all the way to comfortable and smooth. Compared with the
BMW M6 Coupé, damper adjustment is somewhat more oriented to
motoring comfort, thus reflecting the character of the Convertible designed
and conceived for supreme style and refinement on the road. In the sports
program, on the other hand, the suspension set-up and characteristics are
almost the same as on the Coupé.
A further advantage of EDC is that the car’s vibration qualities and ride
smoothness are maintained consistently at all times, regardless of current load
conditions and throughout the entire lifecycle of the BMW 6 Series Convertible.
High-performance brakes like in motorsport.
Reflecting its supreme power and performance, the BMW M6 Convertible
naturally boasts a high-performance brake system with weight-optimised
compound brake discs measuring 374 x 36 millimetres (14.72 x 1.42´´) at the
front and 370 x 24 millimetres (14.57 x 0.94´´) at the rear. Double-piston
swing callipers made of aluminium optimise both weight and stiffness,
reducing unsprung masses and thus enhancing both the car’s driving agility,
motoring safety and driving comfort. The result of this technology
is impressive stopping power and deceleration, the BMW M6 Convertible
coming to a standstill from 100 km/h within 36 metres or 118 feet and just
under 140 metres or 459 feet from a speed of 200 km/h.
Continuous, ongoing control of brake pad wear ensures lasting efficiency and
function of the brake system maintaining its full quality at all times and under
all conditions. In this case a sensor in the brake pads determines current wear
conditions and transfers the information received to the DSC control unit
serving, in turn, to monitor the current condition of the brake pads and specify
the remaining mileage until new pads are required as a function of the
driver’s personal style of motoring. This information is used for
BMW’s Condition-Based Service (CBS) in order to determine when service
and maintenance is required.
The wheels: light and good-looking.
Due to its large brake discs alone, the BMW M6 Convertible comes
on extra-large and muscular wheels. The standard configuration is exclusive
19-inch forged aluminium wheels featuring five contoured double spokes
for particularly graceful and delicate looks – and indeed, each of these wheels
is 1.8 kilos or almost 4.0 lb lighter than a conventional cast aluminium
wheel. As an option, the Convertible is also available with aluminium wheels
in radial-spoke styling already featured on the BMW M5.
On dry and wet roads, tyres measuring 255/40 ZR 19 at the front and
285/35 ZR 19 at the rear transfer high lateral and longitudinal forces to the
surface with optimum precision. Despite their high standard of roll comfort,
these tyres provide optimum feedback to the driver, keeping the car perfectly
on track all the way to the most extreme limit.
Tyre repair system taking the place of a spare wheel.
The tyre repair system consists of a Tyre Defect Indicator and the M Mobility
System (MMS) warning the driver through both an optical and acoustic signal
of any sudden or gradual loss of pressure in one of the tyres. The special
hump geometry of the rims, in turn, keeps even a completely empty tyre on
the wheel, enabling the driver to come to a standstill safely and securely
even in such a situation.
The M Mobility System is housed conveniently in a compact box in the
luggage compartment of the BMW M6 Convertible and serves to seal holes in
the tyre of up to 6 millimetres in size. In practice, this allows the driver to
repair nearly all punctures without having to change the wheel. The decision
thus taken to do without a spare or emergency wheel saves more than
20 kilos or 44 lb in weight now no longer required.
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