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X3 Facelift - E83 (2006 - ...) - Driving experience

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Permanent all-wheel drive the intelligent way: BMW xDrive.
The new BMW X3 owes its all-round potential largely to BMW’s permanent, intelligent xDrive all-wheel-drive system ensuring fully variable front-to-rear power distribution through its exceptionally fast and precise reaction. Via a power divider complete with an electronically controlled multiple-plate clutch, BMW xDrive feeds the power of the engine precisely to where it can be used best and with maximum effect. The result is not only maximum traction on difficult terrain, but also superior driving dynamics, with the system counteracting any over- or understeer in bends right from the start.
The differential lock function, in turn, is ensured by the brakes intervening on any of the wheels threatening to spin.

Power distribution 40 : 60 in normal driving situations.
In normal driving situations engine power is divided 40 : 60 front-to-
rear for optimum smoothness and performance. And then xDrive responds immediately to any change in surface conditions or driving dynamics by modifying the ratio of power distribution accordingly. On surfaces varying extremely in their frictional coefficient from front-to-rear, for example, BMW xDrive is able to re-direct almost the entire drive power of the engine instantaneously to one single axle.
Another advantage of the system is its ability to counteract oversteer in fast bends by closing the multiple-plate clutch tighter and feeding additional power to the front wheels in the interest of optimum driving stability.


Enhanced to an even higher standard: Integrated Chassis Management.
To ensure such fast and precise reaction, xDrive all-wheel drive, DSC Dynamic Stability Control, and engine management are connected to one another by Integrated Chassis Management. With the suspension control sensors also feeding xDrive with the data required for determining current driving conditions, xDrive is able to respond proactively, as it were, in order to stabilise the vehicle at all times.
With its new control philosophy, Integrated Chassis Management ensures even faster and more precise coordination of xDrive and DSC. While so far the behaviour of the vehicle was influenced almost independently by engine and brake management, on the one hand, and the management of longitudinal forces, on the other, these three control cycles now operate in parallel. So while the management of longitudinal forces masterminds the division of engine power front-to-rear, brake management is able to intervene individually on each wheel, applying the brakes appropriately in the interest of optimum traction and driving dynamics.
Engine management, in turn, is able to reduce or increase drive power whenever required.
Forming such a precise network with DSC, BMW xDrive ensures a fast and precise response to any change in driving conditions and, as a result, an even higher standard of driving dynamics.

DSC Dynamic Stability Control with additional functions.
The new BMW X3 features an even more sophisticated system of Dynamic Stability Control now enhanced by numerous additional functions: BMW’s new DSC not only ensures superior driving stability and traction, but also optimises the effect of the brakes by increasing brake pressure as required in response to even the slightest fading under extremely high brake temperatures.
Building up moderate brake pressure at an early point in time, the system also enhances brake standby in situations likely to require spontaneous application of the brakes. Regular Dry Braking, in turn, a function activated automatically as soon as the driver switches on the windscreen wipers, optimises brake performance in the wet.
DBC Dynamic Brake Control, to present yet another example, automatically maximises brake pressure in an emergency when the driver is required to brake all-out. And last but not least, the Set-Off Assistant significantly facilitates the process of setting off on an uphill gradient.
DSC Dynamic Stability Control also comprises the ABS anti-lock brake system, ASC Automatic Stability Control, HDC Hill Descent Control, Trailer Stability Control, and CBC Cornering Brake Control preventing the vehicle from swerving whenever the driver applies the brakes lightly in a bend.


DTC featured for the first time also in a BMW X model.
DTC Dynamic Traction Control also included in the new DSC system likewise enhances the superior driving dynamics of the new BMW X3. With DTC raising the thresholds for intervention by the engine and the brakes to a higher level, the BMW X3 is able to set off smoothly under difficult conditions such as loose snow, intentionally allowing the drive wheels to slightly spin.
DTC also allows a particularly sporting and active style of motoring by offering the driver higher lateral acceleration all the way to a light and controllable drift in bends. Pressing down the DTC button somewhat longer, the driver is able to completely deactivate DSC, as on BMW’s other models. In that case all that remains is a transverse lock function with the brakes intervening on the wheel spinning.
The new BMW X3 comes as standard on 17-inch light-alloy wheels, the BMW X3 3.0sd featuring even larger 18-inch wheels as standard.
Various other light-alloy wheels measuring 18 and even 19 inches are also available as an option, while the Tyre Defect Indicator likewise fitted as standard informs the driver in good time of any loss of tyre pressure.

Last Updated on Monday, 12 April 2010 14:38  

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