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911 Carrera 4 Type 964 (1988 - 1993)

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 (881KB)
porsche-911-carrera-4-964

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

Figure: porsche 911 carrera 4 964 gearbox (136KB)
porsche-911-carrera-4-964-gearbox

Figure: porsche 911 carrera 4 964 gearbox rear differential (159KB)
porsche-911-carrera-4-964-gearbox-rear-differential

Figure: porsche 911 carrera 4 964 rear drive shaft (95KB)
porsche-911-carrera-4-964-rear-drive-shaft

Figure: porsche 911 carrera 4 964 distributor housing (140KB)
porsche-911-carrera-4-964-distributor-housing

Figure: porsche 911 carrera 4 964 central tube (106KB)
porsche-911-carrera-4-964-central-tube

Figure: porsche 911 carrera 4 964 front differential housing (155KB)
porsche-911-carrera-4-964-front-differential-housing

Figure: porsche 911 carrera 4 964 front differential (76KB)
porsche-911-carrera-4-964-front-differential

Figure: porsche 911 carrera 4 964 front drive shaft (105KB)
porsche-911-carrera-4-964-front-drive-shaft

You have better pictures or videos of Porsche 911 Carrera 4 Type 964 (1988 - 1993) that you can contribute? Please send them to !

911 Carrera 4 Type 993 (1994 - 1997)

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

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

Figure: porsche 911 carrera 4s 993 transmission (717KB)
porsche-911-carrera-4s-993-transmission

Figure: porsche 911 carrera 4s 993 rear drive shaft (135KB)
porsche-911-carrera-4s-993-rear-drive-shaft

Figure: porsche 911 carrera 4s 993 viscous coupling (116KB)
porsche-911-carrera-4s-993-viscous-coupling

Figure: porsche 911 carrera 4s 993 central tube (74KB)
porsche-911-carrera-4s-993-central-tube

Figure: porsche 911 carrera 4s 993 front differential (91KB)
porsche-911-carrera-4s-993-front-differential

Figure: porsche 911 carrera 4s 993 front drive shaft (103KB)
porsche-911-carrera-4s-993-front-drive-shaft

Have you seen a better description of Porsche 911 Carrera 4 Type 993 (1994 - 1997) on the web? Please send us the link to or post it in a comment below!

911 Carrera 4 Type 996 (1998 - 2001)

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) on the web? Please send us the link to or post it in a comment below!

911 Carrera 4 Type 996 (2001 - 2005)

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Figure: porsche 911 carrera 4 996 (904KB)
porsche-911-carrera-4-996

Figure: porsche 911 carrera 4 996 front drive shaft (54KB)
porsche-911-carrera-4-996-front-drive-shaft

Figure: porsche 911 carrera 4 996 front axle (48KB)
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Figure: porsche 911 carrera 4 996 front axle and cardan shaft (54KB)
porsche-911-carrera-4-996-front-axle-and-cardan-shaft

Figure: porsche 911 carrera 4 996 limited slip differential (30KB)
porsche-911-carrera-4-996-limited-slip-differential

Figure: porsche 911 carrera 4 996 rear differential (45KB)
porsche-911-carrera-4-996-rear-differential

Figure: porsche 911 carrera 4 996 rear drive shaft (64KB)
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)

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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 - ...)

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

Do you think this information about Porsche 911 Carrera 4 Type 997 (2008 - ...) is incorrect? Please send us what you know to or leave a comment below.

959

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 (801KB)
porsche-959

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Cayenne

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

Figure: porsche cayenne first generation (400KB)
porsche-cayenne-first-generation

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911 Turbo (2007)

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 4 comments
RP
February 22, 2018 - 23:58

Are these Torsen systems or Haldex ?

awdwiki.com
January 11, 2018 - 23:20

test

George
February 11, 2011 - 17:14

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 11, 2010 - 01:34

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.