When designing the 928, which went into series production as of model year 1978, the focus was on lightweight construction. The doors, front wings and bonnet were therefore made from aluminium instead of sheet steel. Behind the plastic bumpers integrated in the body shape there were also aluminium profiles that could withstand a collision at up to 8 km/h (5 mph) without any damage.
The 928 had round, electrically operated pop-up headlights that were integrated in the wings. The rounded fastback was dominated by the large window of the rear lid.
The 928 models were powered by a water-cooled V8 engine with a 90° cylinder arrangement. The displacement of the power unit was increased from an initial 4.5 litres to 5.4 litres. Power was transmitted according to the transaxle principle.
To improve aerodynamics, the models were fitted with a front and rear spoiler from type 928 S (MY 1979) onwards.
The rear axle of the 928 was a completely new development. What made this double-wishbone suspension – also known as the Weissach axle – unique was its toe-in stabilising effect. This worked more or less as a passive rear-wheel steering, making a significant contribution to the active safety of the Gran
928 (MY 1978-82)
The rounded rear end without rear spoiler was an unmistakable distinguishing feature of the 928. Unlike later derivatives, this model did not feature front or rear spoilers. The 4.5-litre engine of the 928 generated 240 hp.
928 S (MY 1980-86)
The 928 S had black front and rear spoilers, side protection strips painted in exterior colour and side direction indicators. The displacement increased from an initial 4.7 litres to 5.0 litres (MY 1986). The power output was 300 hp, increasing to 310 hp as of MY 1984 and 288 hp (with catalytic converter) as of MY 1986.
928 S4 (MY 1987-91)
The 928 S4 featured a rounded front apron with air intakes. The slanting rear end had a black rear wing that projected away from the body between the wide, flush-fitted tail lights. Its 5.0-litre engine produced 320 hp.
Pop-up headlights with visible lenses // Rear lid with large rear window // Front and rear aprons made of deformable plastic // Twin tailpipe // Side direction indicators as of MY 1981
Pop-up headlights with visible lenses // Rear lid with large rear window // Front and rear aprons made of deformable plastic // Front and rear spoilers made of black polyurethane // Side protection strips in exterior colour // Twin tailpipe // Side direction indicators as of MY 1981 // 4-piston brake system with black fixed callipers as of MY 1986
Pop-up headlights with visible lenses // Rear lid with large rear window // Front and rear aprons made of deformable plastic // Rounded front apron with air intakes for brake cooling // Rear wing made of black polyurethane // Side protection strips in exterior colour // Side skirts in exterior colour // Side direction indicators
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* Data determined in accordance with the measurement method required by law. Since September 01, 2017 certain new cars have been type approved in accordance with the Worldwide Harmonized Light Vehicles Test Procedure (WLTP), a more realistic test procedure to measure fuel consumption and CO2 emissions. From September 01, 2018 the WLTP will replace the New European Driving Cycle (NEDC). Due to the more realistic test conditions, the fuel consumption and CO2 emission values determined in accordance with the WLTP will, in many cases, be higher than those determined in accordance with the NEDC. This may lead to corresponding changes in vehicle taxation from September 01, 2018. You can find more information on the difference between WLTP and NEDC at www.porsche.com/wltp.
Currently, we are still obliged to provide the NEDC values, irrespective of the testing method used. The additional reporting of the WLTP values is voluntary until their obligatory use. As far as new cars, (which are type approved in accordance with the WLTP) are concerned, the NEDC values will therefore be derived from the WLTP values during the transition period. To the extent that NEDC values are given as ranges, these do not relate to a single, individual car and do not constitute part of the offer. They are intended solely as a means of comparing different types of vehicle. Extra features and accessories (attachments, tyre formats etc.) can change relevant vehicle parameters such as weight, rolling resistance and aerodynamics. Additionally, weather and traffic conditions, as well as individual handling, can affect the fuel consumption, electricity consumption, CO₂ emissions and performance values of a car.