There were several different engine types, of which the petrol engines included the fuel-injected "E" (Einspritzung), and carburetor "S", and the diesel engines included "D" (diesel), "TD" (turbodiesel), or "TDI" (Turbocharged Direct Injection).
In North America, the 80 was sold briefly as the Audi Fox and from 1980 to 1987 as the Audi 4000.
The Audi 90 was an upmarket version of the Audi 80.
The Audi F103 series, based on the DKW F102 and sold between 1965 and 1972, were named for their horsepower ratings. From 1966 to 1969 the series included an Audi 80 model.
This model debuted in Europe in 1972 as the Audi 80 and in 1973 in the United States as the Audi Fox, and was available as either a 2-door or a 4-door saloon. It effectively took the place of several models that Audi had discontinued (the F103 series, which included the first model designated as an "Audi 80"), and provided the company with a viable rival to the Opel Ascona and the Ford Taunus.
The Audi 80 was first equipped with 1.3 and 1.5litre SOHC I4 engines rated at 55PS (40kW) to 85PS (63kW). On the home market, two- and four- door saloons were available in base trim (55 or 75PS (55kW), called simply Audi 80 and 80 S, respectively), as L models (LS with 75PS (55kW) engine) or as a more luxurious GL (85PS only). In 1973 Audi added the sporty 80 GT (two-door only) featuring a carburetted 1.6 litre engine rated at 100PS (74kW).
The 80 had a MacPherson strut front suspension and a dead rear axle supported by coil springs, trailing arms and a Panhard rod.1
A facelift in autumn 1976 brought about a revised front end in the style of the newly introduced Audi 100 C2 with square instead of round headlights, 1.6 instead of 1.5 litre engines (still of 75/85PS) and a new 80 GTE model with a fuel-injected version of the 1.6 liter (110PS (81kW)) replacing the former 80 GT.
The Fox had a 1.5L engine rated at 55hp (41kW) attached to a 4-speed manual transmission. Subsequent versions came with 1.6L engines rated at 83hp (62kW)2