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911 Carrera 4 Type 964 (1988 - 1993)(Edit)

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: porsche 911 carrera 4 964
porsche-911-carrera-4-964

Figure: Porsche 911 Carrera 4 964 center differential with a multi-plate differential locking clutch
porsche-911-carrera-4-964-center-differential

Figure: porsche 911 carrera 4 964 gearbox
porsche-911-carrera-4-964-gearbox

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

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

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

Figure: porsche 911 carrera 4 964 central tube
porsche-911-carrera-4-964-central-tube

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

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

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

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911 Carrera 4 Type 993 (1994 - 1997)(Edit)

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

Figure: porsche 911 carrera 4s 993
porsche-911-carrera-4s-993

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

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

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

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

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

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

You have better pictures or videos of Porsche 911 Carrera 4 Type 993 (1994 - 1997) that you can contribute? Please send them to !

911 Carrera 4 Type 996 (1998 - 2001)(Edit)

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

Have you seen a better description of Porsche 911 Carrera 4 Type 996 (1998 - 2001) in a paper magazine? Can you please scan it or take a photo and send it to ?

911 Carrera 4 Type 996 (2001 - 2005)(Edit)

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Figure: porsche 911 carrera 4 996
porsche-911-carrera-4-996

Figure: porsche 911 carrera 4 996 front drive shaft
porsche-911-carrera-4-996-front-drive-shaft

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

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

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

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

Figure: porsche 911 carrera 4 996 rear drive shaft
porsche-911-carrera-4-996-rear-drive-shaft

Have you seen a better description of Porsche 911 Carrera 4 Type 996 (2001 - 2005) in a paper magazine? Can you please scan it or take a photo and send it to ?

911 Carrera 4 Type 997 (2005 - 2008)(Edit)

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Have you seen a better description of Porsche 911 Carrera 4 Type 997 (2005 - 2008) in a paper magazine? Can you please scan it or take a photo and send it to ?

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

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

Have you seen a better description of Porsche 911 Carrera 4 Type 997 (2008 - ...) in a paper magazine? Can you please scan it or take a photo and send it to ?

959(Edit)

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: porsche 959
porsche-959

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Cayenne(Edit)

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

Figure: porsche cayenne first generation
porsche-cayenne-first-generation

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911 Turbo (2007)(Edit)

Figure: Porsche 911 Turbo
porsche-911-turbo-2007

Figure: Porsche 911 Turbo front differential and multiplate clutch
porsche-911-turbo-2007-front-differential

Figure: Porsche 911 Turbo multiplate clutch
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.

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