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M3 Cabrio - E93 (2008 - ...) - Engine Management, Gearbox and Chassis

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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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New Engine Management and Brake Energy Regeneration.
A further enhancement is electronic management of the V8 power unit for optimum coordination of all engine functions. At the same time the electronic control unit supports the various functions of the clutch, transmission, steering and brakes all tailored to the specific demands and standards of a BMW M Car. And last but not least, engine management provides a wide range of on-board diagnostic functions, just as it masterminds and controls various ancillary units.
Access to the various engine control maps is also masterminded with the same precision. No less than three different maps are available for engine management, two being activated via a button on the centre console and a further map being controlled via the optional MDrive system. In each case the control maps are influenced by the position of the throttle butterflies in the intake manifold and by other parameters significantly changing engine response.
Ion flow technology serving to recognise the risk of the engine knocking as well as misfiring and miscombustion is a further highlight in engine management. Contrary to conventional technology, this new, revolutionary method detects such risks directly where they may occur, that is within the engine combustion chamber. To do this, the spark plug on each cylinder is carefully monitored and controlled for any indication of knocking. Correct ignition is also controlled in the same process and any mis-firing is effectively detected.
The spark plug thus serves as an actuator for the ignition and as a sensor carefully monitoring the combustion process, thus distinguishing between mis-combustion and misfiring.
This dual function of the spark plug also facilitates diagnostic processes in maintenance and service.
Intelligent energy management with Brake Energy Regeneration enhances the efficiency of the V8 power unit in the new BMW M3 Convertible to an even higher standard. The particular point in this case is that electric power for the on-board network is generated specifically while in overrun and when applying the brakes.
This serves to charge the car’s battery without directly using the energy contained in the fuel. As long as the engine is pulling the car, therefore, the alternator generally remains disengaged. Apart from particularly efficient generation of electric power, this also offers the advantage of even more driving power when accelerating.


Six-speed manual gearbox perfectly matched to the V8 power unit.
The new BMW M3 Convertible comes as standard with a manual six-speed gearbox featuring gear ratios perfectly tailored to the high-speed concept of the eight-cylinder engine. With short gear lever travel like in motorsport and crisp, precise movement of the shift lever, the driver is able at all times to transmit the superior power and thrust of the V8 to the rear wheels with the ideal gear ratio.
Integrated, temperature-controlled oil cooling keeps the temperature of the transmission fluid within the right range even under extreme conditions – for example on the race track. The two-plate clutch optimised for mass inertia, in turn, is carefully matched to the superior power and muscular torque of the eight-cylinder. And the six-speed manual gearbox with all the features so typical of BMW M is likewise able at all times to optimise the superior potential of the new BMW M3 Convertible when accelerating and going for superior performance.

Special chassis and suspension for the dynamic performance typical of a BMW M3.
Like the BMW M3 Coupé and the BMW M3 Saloon, the new BMW M3 Convertible also features rear-wheel drive. This principle of splitting up steering and drive forces on the front and rear axle ensures ideal conditions for dynamic driving qualities, very good directional stability, and safe handling. From the start, therefore, the new BMW M3 Convertible offers the ideal configuration for a particularly agile high-performance sports car.
The new BMW M3 Convertible boasts a chassis and suspension tailor-made for the particular requirements and features of an open car. The “foundation”, of course, is provided by the chassis and suspension carried over from the BMW M3 Coupé appropriately modified for the specific weight distribution and the different roof on the Convertible. Like on convertibles in general, additional features have been integrated in the new BMW M3 Convertible to optimise its torsional stiffness. Compared with former generations of the BMW M3 Convertible, torsional stiffness particularly important to safety and driving dynamics has been significantly increased to an even higher standard, also taking the increase in engine output into account.
Benefitting from the demanding chassis and suspension, as well as the overall construction of the car, the new BMW M3 Convertible offers dynamic driving qualities quite comparable to the excellent driving features already ensured by the BMW M3 Coupé and Saloon.

Last Updated on Monday, 12 April 2010 14:36  

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