BMW all wheel drive explained

All Wheel Drive
...Explained
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...Viscous Coupling
...Differential
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BMW

3-series E30 325iX 1988-1992 - Full-time all wheel drive. Viscous coupling locking center differential with torque split 37% front / 63% rear. The viscous coupling is integrated into the planetary gear center differential. Viscous coupling locks the differential when wheel slipping occurs and transfers up to 90% of torque to the axle that has traction. Viscous coupling locking rear differential distributes torque between the rear wheels.

Figure: BMW E30 325iX transfer case

Figure: BMW 325iX

See also: Viscous coupling

3-series E46 X models 1998-2006 - Full-time all wheel drive with all free differentials. 38% front / 62% rear torque distribution thru planetary gear. ADB-X (Automatic Differential Brake) electronic traction control performs functions of locking differentials.

3-series E90 X models 2006-... - xDrive.

5-series E34 525iX 1988-1996 - Shares its transmission with E30 325ix (needs verification).

5-series E60/E61 2004-... - xDrive.

X3 2003-... - xDrive.

X5 1999-2004 - Full-time all wheel drive with all free differentials. 38% front / 62% rear torque distribution and ADB-X (Automatic Differential Brake) electronic traction control performs functions of locking differentials. Hill Descent Control (HDC).

X5 2004-2007 - xDrive.

X6 - xDrive.

Last updated: 2010-01-16 23:42

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