alfa-romeo (English, Русский)

155 Q4(Edit)

Central epicyclic unit, Ferguson viscous coupling and Torsen rear differential Source

Figure: Alfa-Romeo 155 Q4
alfa-155

Figure: Alfa-Romeo 155 Q4 front differential with epicyclic torque distributor and Ferguson VC
155Q4-Front-Diff

Figure: Alfa-Romeo 155 Q4 rear differential
155Q4-Rear-Diff

Figure: alfa romeo 155
alfa-romeo-155

Also see Lancia Dedra/Fiat Tempra.

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155 DTM(Edit)

Figure: alfa romeo 155 dtm 1
alfa-romeo-155-dtm-1

Figure: alfa romeo 155 dtm 2
alfa-romeo-155-dtm-2

Figure: alfa romeo 155 dtm 3
alfa-romeo-155-dtm-3

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156 Crosswagon(Edit)

Full-time all wheel drive system with centre Torsen C differential.

Source (Italian)

Torsen? Source

Have you seen a better description of Alfa-Romeo 156 Crosswagon on the web? Please send us the link to or post it in a comment below!

159 (2005-2011)(Edit)

AWD system: "Q4"

Full-time all wheel drive system with centre Torsen differential ("Torsen T3-Twin").

Source

Distribution: 57% rear, 43% front.

Integrated with ASR and VDC (ESP by Alfa Romeo).

Source

Probably the same Q4 version of Alfa Romeo 156 Crosswagon.

AWD system available only with these "Q4" models:

3.2 petrol engine JTS V6 24v 191KW years 2005->2009 Automatic / Manual Transmission

2.4 diesel engine JTDm 20v 154KW years 2007->2009 Automatic / Manual Transmission

?Torsen Source?

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164 q4(Edit)

Assymetric full-time all wheel drive with electronically-controlled center differential lock.

The "Viscomatic" unit - central viscous coupling locking epicyclic unit located near the rear axle and Torsen rear differential (prove?).

The Viscomatic was developed by Alfa-Romeo in collaboration with Steyr-Puch. This is a further evolution of the device that was previously used on the Proteo.[1]

Source

Figure: alfa romeo 164 q4 transmission
alfa-romeo-164-q4-transmission

Figure: Alfa-Romeo 164 q4 rear differential housing with Viscomatic central differential unit.
alfa-164-q4-viscomatic_x

Figure: alfa 164 q4 viscomatic
alfa-164-q4-viscomatic_xxx

Figure: Gearbox with power takeoff to the rear wheels
alfa-164-q4-viscomatic_xx

Figure: All wheel drive control diagram
alfa-164-q4-viscomatic

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33 Q4 (1983-1991)(Edit)

Disengageable automatic all wheel drive.

The 33 Q4 made its debut in 1983. The layout adopted for this compact saloon meant that the rear wheel drive had to be engaged by means of a lever in the passenger compartment. A Ferguson viscous coupling was used to transfer torque to the rear axle when four wheel drive is engaged and front wheels slip. It also offered higher ground clearance than front wheel drive cars.

Figure: Alfa Romeo 33 Q4 transmission before 1991
alfa-romeo-33-Q4-transmission

Figure: alfa romeo 33 Q4 transmission
alfa-romeo-33-Q4-transmission_x

Figure: alfa romeo 33 Q4 transmission
alfa-romeo-33-Q4-transmission_xx

Do you own Alfa-Romeo 33 Q4 (1983-1991)? Can you please make a photo of the car's 4x4 transmission, switches, dashboard lights, etc. and send it to ?

33 Permanent 4 (1991-...)(Edit)

Full-time all wheel drive.

In 1991, the Alfa 33 was fitted with a sportier interpretation of the four wheel drive concept. The transmission layout of the new Permanent 4 (this was the name of the version) was more complex than its predecessor: a set of sensors managed the action of a viscous coupling that transferred movement to the rear wheels (generally free) when it detected significant differences between wheel rotating speeds across both axles.

Figure: alfa romeo 33 4x4 transmission
alfa-romeo-33-4x4-transmission

Figure: alfa romeo 33 4x4 ferguson coupling
alfa-romeo-33-4x4-ferguson-coupling

Figure: alfa romeo 33 4x4 logo
alfa-romeo-33-4x4-logo

Do you own Alfa-Romeo 33 Permanent 4 (1991-...)? Can you please make a photo of the car's 4x4 transmission, switches, dashboard lights, etc. and send it to ?

Brera(Edit)

Torsen? Source

Have you seen a better description of Alfa-Romeo Brera in a paper magazine? Can you please scan it or take a photo and send it to ?

Matta AR51(Edit)

Figure: alfa romeo matta ar51
alfa-romeo-matta-ar51

Do you think this information about Alfa-Romeo Matta Ar51 is incorrect? Please send us what you know to or leave a comment below.

Spider Q4(Edit)

Torsen? Source

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http://www.alfaromeopress.com/press/detail/6796

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Footnotes


  1. http://stilealfaromeo.forumfree.it/?t=39435683

There are 2 comments
George
January 11, 2010 - 00:44

Don't forget the 'Q4' Alfa-Romeo models.
Torsen 3 [or 'C' if you like] center differential.

Reply to George
piggiu
September 04, 2012 - 14:40

Alfa Romeo 159 Q4 technology :
www.youtube.com

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