Quattro - street version Quattro - rallye version Quattro A1 Quattro A2
Audi Quattro aka urquattro
	Manufactured: 1981 - 1983 (rallye) 1980 - 1991 (production series) Engines: "WR" 2144cc - 10V - 200hp / 285Nm - 07/80 - 07/87 "MB" 2226cc - 10V - 200hp / 270Nm - 08/87 - 07/89 "RR" 2226cc - 20V - 220hp / 309Nm - 08/89 - 05/91 "WX" 2144cc - 10v - 160hp / 230Nm - 08/84 - 07/89 "GV" 2144cc - 10V - 200hp / .. Nm - 07/80 - 07/87 (Swiss, Sweden)
The Quattro was a project started in 1977 under Jens Bensinger and was kept secret until FIAs approved use of fourwheeldrive in the top class of rallying, Group 4, in 1975. Audi AG ment it would be the perfect way to prove the advantage for it's middleclass roadgoing cars, so funds were given the project. Prototypes was based on the Audi 80 and featured the drivetrain from VW Iltis and the engine from the Audi 200 5T. Seriesproduction: In Geneva 1980 the Quattro - now better known as the urquattro - was presented for the worldpress. This car made a big impact as fourwheeldrive until then was preserved for utility and all-terrain vehicles. It came with the WR engine, 6x15" aluminiumrims, dual square headlights, and a manual transmission. The instruments was regular analogue ones, surrounded by push-functional buttons, and the interior was brown and paint optional between saturn metallic, diamond silver or venusred. Taillights was seperated red and amber, while the rear reflexplate was read featuring 'quattro' in black ensignia. 1981 brought the pneumatic differantiallock which was controlled by a button on the centerconsole, and a new paintcolor. Equipped as the 1981 version, it wasn't any alterations for the 1982 model. Export for the US was started. The US cars came with the bigger "safety bumpers" which are bigger than the european spec ones. 1983 introduced the bigger differences, as it now featured a digital instrumentcluster featuring acoustic warnings. Exterior was wider 8" rims and new, wider headlights. ABS was now optional, alongside aircondition and the interior could opt between leather and fabric. 1984 featured mostly the same car, but added another paintcolor. 1985 featured the same engine as befor, but for countries with special emissiondemands - such as Switzerland and Sweden - the urquattro also came with the WX engine with 165hp. New interioroptions with fabric or leather, one-piece Cibie headlights which gave the car a newer look, black taillights and reflexplate, and a 2-step turnbutton for controlling the differential. No alterations for the 1986 version. 1987 was pretty much the same car aswell, but the WR engine was phased out during the year for the higher capacitated MB engine, although the output was the same. In Switzerland there were a "Speciale edition" with 200 numbered cars - all with the WX engine, fully equipped, analogue instruments and the option between fabric or full leather. 1988 finally brought the partial galvanization of the chassis and the end for the Special editions. 20V RR engine came in the 1989 model, now with a new Bosch Motronic fuelinjection. This engine had 220hp by 5900rpms and with 9.3:1 C:R. The bootlid was of fiberglass, and the instrumentcluster featured red lumination withouth the analogue warningmodule. There were no differences for the 1990 or 1991 versions, with a total of 898 20 valved cars produced. Production stopped at May 1991 with 11 452 urquattros in total. Chassisnumbering: 1980 - 85 ZAA 900*** og 85 ZBA 900*** - 292 1981 - 85 ZBA 90099*** - 1956 1982 - 85 ZCA 900*** - 1935 1983 - 85 ZDA 900*** - 1455 1984 - 85 ZEA 900*** - 1567 1985 - 85 ZFA 900*** - 1530 1986 - 85 ZGA 900*** - 774 1987 - 85 ZHA 900*** - 435 1988 - 85 ZJA 900*** - 610 1989 - 85 ZKA 900*** - 462 1990 - 85 ZLA 900*** - 413 1991 - 85 ZMA 900*** - 23 898 20 valved cars in total   Special editions: Audi Quattro, Treser rebuilt engine with fueldistributer for 8 cylinders. There has been some special editions of the urquattro, built by Treser. Besides making a hideous roadster, they delivered aftermarket wheels, rearspoiler, a special rallye-look dashboard, sport steeringwheel and gearknob, own bucket seats and even a 10V tuning sollution featuring the fueldistributor from the Porsche 928, with 3 plumbed outtakes. This, together with other CR, pistons, camaxle and bigger intercooler and exhaustvalves. These Tresers also got a longer 5th gear. Not direct special editions of the urquattro, but both Treser and ABT had Audi 80 quattros featuring the 2.1T from the urquattro. Even Audi AG had a Audi 80/90 quattro built with urquattro looks and parts.   Rallye production: Audi had for a longer period wanted to participate in the World Rally Championship, and when FIA approved the use of fourwheeldrive in it's big division, the groub 4, it all started. A rallye version of the street Quattro was made with the same 10V engine with 320hp and introduced in Monte Carlo 1981 and had it's last race in the 1982 RAC. Engine: inline 5, cast-iron block, alu-head, 10V, special steel-conrods. Capacity: 2144cc by bore 79,5mm x 86,4mm stroke Compression-ratio: 6.3:1 Power: 320hp / 6500 rpms Torque: 412Nm / 3250 rpms Engines fitted with KKK K27 turbochargers that gave 1.6BAR, and hat the first Hitachi MAC-10 management (similar to the production cars), but was later changed for Bosch units. Drivetrain was a 5 speed gearbox, lockable center-differential and 75% lockable rear-differential, Fichtel & Sachs clutch. McPherson struts with Boge rallye dampers, or rallye coilovers. 2524mm wheelbase and 1465mm width in front, and 1502mm at rear. Depending on gearing, topspeed between 173km/h and 253km/h. 0 - 100km/h between 4.9 and 5.2 sec. Brakes were 280mm, hydraulic handbrake. Fuchs 5 spoked 6" or 7" wide wheels for rough roads, or 10" for asphalt racing - all 15" diametre and fitted with Weber tires. Length/height/width is 4404/1733/1344mm, weight between 1190 and 1240kg, FIA rules states minimum 1005kg.
Audi Quattro A1
	Manufactured: january 1983 - may 1983 Engine: 2145cc - 10v - 340hp / 414 Nm Pictures:
The A1 was really just an evolution of the Gr4 car, but homologated to fit the new Group B environment. It had it's first rallye the 1983 Rally Monte Carlo, and the last at the Safari rally the same year. Price in 1983, ca 285 000DEM. Engine: inline 5, cast-iron block, alu-head, 10V, special steel-conrods. Capacity: 2145cc by bore 79,51mm x 86,4mm stroke Compression-ratio: 6.3:1 Power: 340hp / 6000 rpms Torque: 414Nm / 3650 rpms Early versions fitted with K27 turbos, while latter used K26 at 0.8~1.9 BAR. Most significant was probably the use of the motorsport Pierburg-Bosch mechanical injection. Standard inlet- (38.2mm) and outletvalves (33.3mm) was changed for 41.1 and 35.2mm ones. Dry sump, Matter fueltank positioned in the trunk and a heattreated forged crankshaft. Generally, the A1 introduced the lightweight materials to the rally typ 85s. Most noticeable is the wider wheelarches, the airinlet in front of the rear arch and Michelen decals. Matter had 3 versions of rollcages, in aluminium or steel. Same dimensions as for the Group 4 car, but weight is now between 1130~1140kg.
Audi Quattro A2
	Manufactured: may 1983 - 1984 Engine: 2110cc - 10v - 360~400hp Pictures:
Homologated with a new 2133cc engine, due new Group B regulations for turbofactor at 1.4. This made the rallye Quattro 2954cc as it ran a shorter stroke and wider bore than homologated, giving it 2110cc and a FIA-displacement of 2954cc. Most A2s used the K26 turbos as the A1s did, but a new manifold and K27 turbo setup was used on the very last cars. Engine: inline 5, alu-block, alu-head, 10V. Capacity: 2110cc by bore 79,5mm x 85mm stroke Compression-ratio: 6.5:1 Power: 360hp / 7000 rpms Torque: 450Nm / 4000 rpms Kevlar fenders, while bonnet, hatch, doors and sidewindows were made of plastic. Noticeable by two vents in rear fenders, and wider fenders allowing up to 11" wheels. First used at Corsica 1984 and last in RAC 1984. 0 - 100km/h in approx 4.5 seconds, topspeed at 185km/h (as A1) Althoug all A2s had the 10 valved alu-engines, there was one car featuring the new 20V engine found in the rallye Sport Quattro. This car belonged to Stig Blomquist, as he preferred the handlingcharacteristics of the long wheelbase Quattros over the shorter ones.

sources:
'The Audi Quattro book', Dave Pollard
'Audi quattro', Laurence Meredith
'Quattro - the development & competition history', Jeremy Walton
'Audi quattro', Jan-Henrik Muche
'Audi Sport quattro', Jürgen Lewandowski
Jørn Amundsen, John-Arild Martinsen (foto), Jan Tore Kopperud, Andi Bray (foto),
Per Lindgren, urquattro.ch, urquattro.at, audiquattrofan.de, UK Quattro network,
Auto Art, treser-audi.de.