When designing the 928, which was mass-produced from model year 1978, the focus was on lightweight construction. For this reason, the doors, front wings and bonnet were all made of aluminium instead of sheet steel. Integrated into the bodyshell shape behind the plastic bumpers, there were also aluminium profiles that could withstand an impact at up to 8 km/h (5 mph) without sustaining damage.
The 928 had round headlights, which were integrated into the wings and could be raised electrically. The rounded fastback was dominated by the large window on the rear lid.
The 928 models were powered by a water-cooled V8 engine with a 90° cylinder arrangement. The engine's displacement was initially 4.5 litres and was later increased to 5.4 litres. Power was transmitted via a transaxle construction.
To improve aerodynamics, the 928 S models (mode year 1979) were given front and rear spoilers.
The rear axle on the 928 was a complete novelty. What was special about this double-wishbone suspension – also known as the Weissach axle – was its toe-in stabilizing effect. This worked more or less like a passive rear wheel steering and made a significant contribution to the active safety of the Gran Turismo.
928 GT (spring 1989 to MY 1991)
The 928 GT had a sportier design than the 928 S4. Thanks to various modifications, its engine generated power of up to 330 PS. As standard, the GT was delivered without side protection strips and with wheels in a unique design.
928 GTS (MY 1992–95)
The last evolutionary stage of the 928 series, the 928 GTS had flared rear wings, a Red light strip on the rear, a rear spoiler painted in the vehicle colour, Cup-design exterior mirrors and 17-inch Cup rims as standard. The 5.4-litre engine produced 350 PS.