Audi 80/90 B2/B3 quattro, Audi Quattro, Audi UrQuattro 1981-1987
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First quattro evolution. Full-time all wheel drive with free differential. Manually locking, pneumatically-activated (by 2 rotating switches, or by a pull knob on the console) rear and center differential.
Figure: Audi 80 B3 quattro (60KB) 
Figure: Audi 100 C3(?) quattro (78KB) 
Figure: Audi Quattro (91KB) 
Figure: audi quattro (49KB) 
Figure: audi quattro (436KB) 
Figure: audi quattro rally (1649KB) 
Figure: quattro I transmission. On the top picture: center differential (5), center differential locking fork shaft (6), differential locking actuator (7) (133KB) 
Figure: audi quattro I (90KB) 
Figure: audi 100 quattro (45KB) 
Figure: Audi 100 quattro rear differential (38KB) 
Figure: Audi 100 quattro rear differential locking mechanism (arrow) (46KB) 
Figure: Audi 100 quattro center differential locking mechanism (42KB) 
Figure: audi 80 quattro b2 transsmision (173KB) 
Figure: audi 80 quattro b2 front differential (92KB) 
Figure: audi 80 quattro b2 front axle (81KB) 
Figure: audi 80 quattro b2 central differential (80KB) 
Figure: audi 80 quattro b2 propeller shaft (67KB) 
Figure: audi 80 quattro b2 rear differential (95KB) 
Figure: audi 80 quattro b2 rear axle (84KB) 
Figure: audi 80 quattro b2 rear differential housing and lock (82KB) 
Figure: audi 80 quattro b2 vacuum lock system (89KB) 
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Audi 80/90(B3/B4)/100/200/S2/S4 quattro 1987-1994, RS2 1994-1995
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quattro II. Full-time all wheel drive. Torsen center differential with automatic distribution of torque between front and rear axles. Manually activated (electro-pneumatic system) rear locking differential which automatically unlocks when speed exceeds 25 km/h.
Figure: Audi 80 B4 quattro (207KB) 
Figure: audi s2 coupe from 1991 (394KB) 
Figure: audi rs2 avant from 1994 (133KB) 
Figure: Audi 200 C3 quattro (337KB) 
Figure: Audi 100 C4 quattro (337KB) 
Figure: quattro II transmission with Torsen center differential (50KB) 
Figure: Audi 100 rear differential and differential lock fork(13) (10KB) 
Figure: Audi 100 rear differential locking vacuum pipes (87KB) 
Figure: Audi 80/100/90/200/a4/a6/s4/s6 transmission. 1 - Torsen center differential; 2 - Rear driveshaft output; 3 - Front differential; 4 - Engine input (121KB) 
Audi 80 B3:
Figure: audi 80 quattro b3 front axle (107KB) 
Figure: audi 80 quattro b3 central differential torsen (78KB) 
Figure: audi 80 quattro b3 propeller shaft (67KB) 
Figure: audi 80 quattro b3 rear differential (95KB) 
Figure: audi 80 quattro b3 rear differential lock (105KB) 
Figure: audi 80 quattro b3 rear differential vacuum lock (78KB) 
Figure: audi 80 quattro b3 rear axle (90KB) 
Audi 80 B4:
Figure: audi 80 quattro b4 central differential torsen (78KB) 
Figure: audi 80 quattro b4 propeller shaft (70KB) 
Figure: audi 80 quattro b4 rear differential (83KB) 
Figure: audi 80 quattro b4 rear differential housing and lock (95KB) 
Figure: audi 80 quattro b4 rear differential vacuum lock (78KB) 
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Audi V8 Automatic 1988-1994
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quattro III - Full-time all wheel drive. Torque distribution via electronically controlled multi-plate hydraulic transfer clutch in the center. Torsen differential in the rear axle. Quattro was for the first time used with automatic transmission. The gearbox was the source for high pressure oil, that was used to activate the clutch.
Figure: audi v8 (75KB) 
Figure: audi v8 (71KB) 
Figure: audi v8 (57KB) 
Figure: audi v8 (50KB) 
Figure: audi v8 (37KB) 
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Audi A4/A6(C4)/A6(C5)/A8/S4/S6/Allroad quattro 1994-2007, S4/S6 quattro 1994-2005
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quattro IV - Full-time all wheel drive. Torsen center differential. Electronic traction control (EDL) on front and rear axles that applies brakes to spinning wheels, which has effect of locking front and rear differential. Works at speeds up to 40 kph (25mph). On more powerful versions S4/S6 - up to 80 kph (50mph). A8 uses EDL and ASR, which reduces engine output. It is almost impossible to lose traction with this system under any circumstances, except if one of the axles is raised in the air. Audi Allroad can feature low range (optional).
Figure: audi a4 (25KB) 
Figure: Audi A4 B6 quattro (86KB) 
Figure: audi a8 quattro d2 from 1994 (1757KB) 
Figure: audi s4 avant b6 from 2003 (379KB) 
Figure: audi a6 allroad quattro c6 from 2006 (152KB) 
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Audi RS4 B7 manual/Q7 2005-..., S4 B7 manual 2006-..., A5 2006-..., A6 2006-...(verify), all A4 B8 2007-..., RS6 2008-...
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quattro V. Full-time all wheel drive. Torsen type III planetary type differential with a 40/60 front/rear split for improved handling.
Figure: audi a4 allroad quattro b8 from 2008 (930KB) 
Figure: audi a6 allroad quattro c7 from 2012 (930KB) 
Figure: audi a6 quattro c7 from 2011 (977KB) 
Figure: audi a4 quattro b8 from 2008 (887KB) 
Figure: audi a5 quattro coupe from 2007 (955KB) 
Figure: audi a5 quattro coupe from 2007 (1010KB) 
Figure: audi rs 6 avant c6 (649KB) 
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Audi RS5 (2011-...)
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quattro VI. Full-time all wheel drive. Crown gear differential with a 40/60 front/rear split.
Figure: audi rs5 from 2010 (332KB) 
Figure: audi rs5 quattro transsmision from 2011 (79KB) 
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Audi A4 B9 quattro (2014-...), A5 quattro (2016-...)
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quattro VII. Automatic all wheel drive allegedly called e-quattro. The e-quattro system would allegedly use a pair of electric motors with a combined output of 136 horsepower to drive the rear wheels, while the internal-combustion engine would supply power to the front wheels only.
Have you seen a better description of Audi A4 B9 Quattro (2014-...), A5 Quattro (2016-...) on the web? Please send us the link to or post it in a comment below!
Audi A3/S3 quattro (1998-2003)
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Haldex Generation I automatic all wheel drive system - electronically controlled Haldex multi-plate hydraulic clutch, located near the rear differential. Normally front wheel drive vehicle. It detects the need of all wheel drive at 1/8 of the wheel spin and transfers up to 100% of torque to the rear axle.
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