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M3 Cabrio - E93 (2008 - ...) - Differential, Dynamic driving and Damper control

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M3 Cabrio - E93 (2008 - ...)
Know-how from Motorsport
The V8 engine
Engine Management, Gearbox and Chassis
Suspension, Brakes and Steering
Differential, Dynamic driving and Damper control
MDrive and Torsionally stiff body
The interior
BMW M all the way
iDrive, Audio system and Performance
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Variable M Differential Lock for perfect traction on the rear axle.
The new final drive features BMW’s variable M Differential Lock also on the BMW M3 Convertible. Generating up to 100 per cent locking action when required in a fully variable process, this special differential lock ensures optimum traction on all surfaces and in fast, dynamic bends.
The variable M Differential Lock responds to differences in speed between the left and right rear wheel and offers ideal support enhancing the positive qualities of rear-wheel drive to an even higher standard.

Dynamic driving programs in M-specific configuration.
Electronic dynamic driving programs support the driver in dynamic situations approaching the limits to driving physics. DSC Dynamic Stability Control, for example, offers an even wider range of functions on the new BMW M3 Convertible in the interest of enhanced driving safety. When necessary DSC will intervene specifically in the brakes on individual wheels and reduce engine power in order to maintain driving stability. Pre-loading of the brake pads serves, as another example, to give the driver valuable time when applying the brakes in an emergency and significantly shorten his stopping distances. Yet a further feature offered by DSC is regular Dry Braking not even noticeable to the driver, keeping the brake discs free of the usual water film on the surface when applying the brakes in the wet and thus avoiding any loss of brake power.
Dynamic Stability Control includes ABS anti-lock brakes, ASC Automatic Stability Control preventing the wheels from spinning on surfaces with reduced grip, a Start-Off Assistant preventing the car from rolling back when setting off on an uphill gradient, and CBC Cornering Brake Control reducing the risk of the car spinning or swerving out of control in a bend. A further feature of DSC is its ability to increase brake pressure whenever the brake system becomes extremely hot, thus maintaining a consistent level of brake power (Fading Compensation). The behaviour and response of these dynamic driving programs is naturally tailored to the superior performance of the BMW M3 Convertible. The system thus intervenes with electronic precision in an appropriate style matched to the excellent dynamic qualities and supreme power of the car. A further point is the driver’s option to configure certain parameters individually, thus adjusting the response of the car to his personal preferences.
Pressing a button in the centre console, the driver is able to completely deactivate DSC Dynamic Stability Control, the particularly ambitious driver therefore being able in such a case to push the dynamic potential of his car to the utmost. So when driving this sports car on a race track, the experienced and ambitious specialist is able to reach the utmost limits to driving physics and enjoy all of the car’s dynamic power in bends.


Electronic Damper Control responding spontaneously to every change in driving conditions.
As an option the new BMW M3 Convertible may be equipped with EDC Electronic Damper Control. Adjusting damper forces electrohydraulically, EDC optimises both the car’s vertical vibration behaviour as well as its yaw and roll motion in bends and its dynamic axle load distribution when applying the brakes and when accelerating.
Like the engine control map, operation and implementation of Electronic Damper Control may be varied at the simple touch of a button on the centre console to the driver’s individual preferences, offering the driver the choice of three settings Normal, Comfort, and Sports. The range of damper adjustment covered in this way is far greater than with conventional systems of this kind.
Quite generally, the new BMW M3 Convertible offers a wide range of driving qualities and characteristics all the way from very dynamic to more comfortable. In the Sports mode, EDC keeps the body of the car and all movements particularly firm and almost rigid. Wherever the driver does not seek such a particularly sporting set-up, he can opt either for the Normal or for the Comfort mode. In such cases, depending on the set-up chosen, the system responds also to smaller bumps in the road by more sensitive behaviour and with longer damper travel.
A further point is that EDC follows an adaptive pattern in all operating modes, adjusting damper forces quickly and sensitively to any change in driving conditions. As soon as faster movement of the steering wheel and higher steering angle speeds indicate that the driver is opting for a more dynamic style of motoring on winding roads, damper forces are increased automatically, EDC possibly even reaching the maximum limit of damper force for a short spell under such conditions, regardless of the set-up currently chosen.
This perfectly supports any spontaneous changeover from comfortable cruising to a more sporting and active style of motoring.
Offering qualities of this kind, EDC ensures that the chassis and suspension are able to perfectly handle the very different driving conditions and demands faced in such a high-performance convertible. Featured in the new BMW M3 Convertible, EDC thus offers the entire range of motoring qualities from smooth gliding at low speeds all the way to dynamic motoring in a most sporting style. And with optional MDrive, the driver is even able to save his preferred EDC set-up as part of the car’s individual configuration.

Last Updated on Monday, 12 April 2010 14:36  

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