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911 Carrera 4 Type 964 (1988 - 1993)Next

Full-time all wheel drive system with torque distribution 31/69% front to rear. Three differential system using computer-controlled hydraulic clutches (Porsche Dynamische Allrad Steuerung or PDAS for short) to help distribute power to the four wheels.

Figure: (881KB)
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Figure: Porsche 911 Carrera 4 964 center differential with a multi-plate differential locking clutch (82KB)
porsche-911-carrera-4-964-center-differential

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porsche-911-carrera-4-964-gearbox

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porsche-911-carrera-4-964-gearbox-rear-differential

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porsche-911-carrera-4-964-rear-drive-shaft

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porsche-911-carrera-4-964-distributor-housing

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porsche-911-carrera-4-964-front-differential-housing

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porsche-911-carrera-4-964-front-differential

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porsche-911-carrera-4-964-front-drive-shaft

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911 Carrera 4 Type 993 (1994 - 1997)Next

Automatic all wheel drive. Mechanical limited slip at rear, viscous coupling in the center.

Figure: (720KB)
porsche-911-carrera-4s-993

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porsche-911-carrera-4s-993-transmission

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porsche-911-carrera-4s-993-rear-drive-shaft

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porsche-911-carrera-4s-993-viscous-coupling

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porsche-911-carrera-4s-993-central-tube

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porsche-911-carrera-4s-993-front-differential

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porsche-911-carrera-4s-993-front-drive-shaft

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911 Carrera 4 Type 996 (1998 - 2001)Next

Automatic all wheel drive. Viscous coupling just behind front differential, transferring from 5 to 40 % up front.

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911 Carrera 4 Type 996 (2001 - 2005)Next

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Figure: (924KB)
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porsche-911-carrera-4-996-front-drive-shaft

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porsche-911-carrera-4-996-front-axle

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porsche-911-carrera-4-996-front-axle-and-cardan-shaft

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porsche-911-carrera-4-996-limited-slip-differential

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porsche-911-carrera-4-996-rear-differential

Figure: (79KB)
porsche-911-carrera-4-996-rear-drive-shaft

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911 Carrera 4 Type 997 (2005 - 2008)Next

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911 Carrera 4 Type 997 (2008 - ...)Next

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Figure: Porsche 911 Carrera 4 front differential (model year unknown) (7KB)
porsche-911-carrera-4-front-differential

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959Next

permanently locked multi-plate hydraulic clutch in the center. Unlocked only if turning at low speed, for example while parking. Torque distribution in this vehicle is adjusted even before wheelspin occurs. Gathering information from numerous sensors (i.e. g force sensor, accelerator pedal position, speed, and even turbo pressure) while accelerating, computer changes normal 40front/60back torque split, sending up yo 80% to the rear wheels, even if all four wheels are rotating with the same speed.

Figure: (823KB)
porsche-959

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CayenneNext

Full-time all wheel drive. 38/62 torque split under normal conditions. Multiplate clutch lockable center differential. (?)

Figure: (424KB)
porsche-cayenne-first-generation

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911 Turbo (2007)Top

Figure: Porsche 911 Turbo (151KB)
porsche-911-turbo-2007

Figure: Porsche 911 Turbo front differential and multiplate clutch (178KB)
porsche-911-turbo-2007-front-differential

Figure: Porsche 911 Turbo multiplate clutch (137KB)
porsche-911-turbo-2007-multiplate-clutch

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There are 2 comments
George
February 11, 2011 - 15:14

The new generation Porsche Cayenne lost its center differential. In its place is a clutch pack to power the front differential, which is the same as the Porsche Panamera.

George
January 10, 2010 - 23:34

I wonder how asymmetric the torque split of the planetary center differential would had to have been, to avoid offending Porsche loyalists?
www.autozine.org
It seems 31/69 was not enough, maybe 20/80 would have kept the oversteer on demand, reduced understeer at the limit, and kept the 'pure' steering feel of rear drive.

The Bugatti EB110, if I recall correctly, was 27/73, and wasn't as rear heavy as a 911.