xDrive

The system BMW xDrive all-wheel drive ensures the preservation of traditional classical design features typical of BMW. Intelligent drive system xDrive 4 × 4 and variably in a split second distributes power between both axles. Under normal conditions, the torque distribution ratio in the ratio 40:60, ie with a preference for rear wheels.

German carmaker BMW has developed a drive system xDrive in response to competitive systems with viscous clutch (Torsen, Haldex). These systems typically use a viscous coupling for the connection to the rear axle or redistribution of the transmitted torque ratio between the two axles. BMW xDrive system connects the front wheels. XDrive biggest advantage against competing systems is its speed of response to wheel slip (under 0.1 seconds) and direct integration into the DSC stability system .

The default ratio of division of power between the front and rear wheel xDrive system is at 40:60. With such a distribution remains the driving feel characteristic of BMW. P ccording driving situation xDrive system may send up to 75% power to the front wheels. When compared with the classical system Quattro with a constant torque distribution ratio of 50:50 is behind the wheel of BMW xDrive feel much less prone to understeer. With preference rear car has a tendency to understeer.

According to the manufacturer's xDrive system requires minimal maintenance. Only in the event of frequent heavy loads (such as long-towing) recommends replacement automobile clutch and oil, 150 thousand kilometers.

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History:
The first BMW all-wheel drive has become a model 325iX. The first was launched in the sedan in 1985. All-wheel drive was stable through three differentials.

Text: John Sajdl
Photo: www.bmw.com
Keywords: BMW, drive, all-wheel drive, 4x4, xDrive