Porsche 928S4 ~ 1987-1991

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.

 

 

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

 

 

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