Ten years after the first 928 was launched, Porsche unveiled the 928S4. This had a 5.0-litre engine with four valves per cylinder and twin overhead camshafts per cylinder bank. Power rose to 320bhp.

The updated car looked more modern, thanks to smoother and flusher front and rear bumpers and lights, while there was a large black rear spoiler.

Intriguingly, the S4 had an intelligent cooling system for the engine. This consisted of horizontal louvres between the front intake and the radiator; these were computer controlled and their angle changed according to coolant temperature. The idea being that the louvres were kept closed as much as possible to ensure the best aerodynamic efficiency; the Cd increased from 0.34 to 0.36 when they were open.

Porsche 928S4


Capacity: 4957cc

Compression ratio: 10.4:1

Maximum Power: 320bhp @ 6000rpm

Maximum Torque: 430Nm

Brakes: Front: 282mm discs; rear: 289mm discs; servo assisted with ABS

Suspension: Front: Independent with double wishbone, telescopic dampers with co-axial coil springs, plus anti-roll bar Rear: Independent with lower wishbones, upper transverse link (Porsche-Weissach patent geometry), coil springs, telescopic dampers, plus anti-roll bar

Wheels & Tyres: Front: 16x7J with 225/50VR16 tyres. Rear: 16x7J with 225/50VR16 tyres

Length: 4470mm

Width: 1829mm

Weight: >1640kg

Did you Know?

0-60mph: 6.0sec Top speed: 165mph