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Porsche 928 S4 CS/SE (1988-1989)

Porsche 928 S4 CS/SE (1988-1989)

The 928 Clubsport & Sport Equipment

The regular Porsche 928 is a fine grand tourer but not as sharp to drive on a track as its 911 sibling. The 928 Club Sport introduced in 1988 set out to change that by reducing weight and making the 928 more engaging to drive.

The Clubsport was up to 100 kg (220 lb) lighter and was the toned-down version of the 1987 factory prototype which had a lightened body. In 1987, the factory made five white lightweight S4 models with a manual transmission for racecar drivers. The Special Equipment (SE) was a more complete version of the CS, in which some accessories lost in the CS are added back again. Porsche did install an LSD, forged alloys, and a stiffer suspension to make the 928 CS a great track car. A very collectible car.

The 928 Clubsport

The Porsche 928 Clubsport was a lightened version of the 928 S4 designed for road and track use, and was available in continental Europe and the USA. Porsche had been experimenting with such a car as far back as 1983 and had built prototypes, but it wasn’t until 1988 that the Clubsport went on sale. It kicked off the program in 1987, a year before customer deliveries started, by giving five to its works drivers, including Derek Bell.

Porsche produced a limited run of 17 CS 928s and the main focus was a crash diet to lose weight. The weight was reduced from 1640kg to 1450kg by way of removing much of the sound-deadening material, fitting a simpler wiring loom, and removing much of the electrical equipment, such as electric seat adjustment (although the power windows remained). In short, the car was stripped of much of its luxuries.

The 928 Clubsport got the S4’s 5.0-litre V8, with modifications including higher lift cams and a revised ECU, increasing the rev limit to 6775 rpm and pushing power from the stock 320hp to 330hp. Power was 330 bhp at 6200 rpm, while torque remained unchanged but peaked at a higher 4100 rpm. Power was sent to a limited-slip rear end through a  5-speed manual gearbox. The suspension was uprated with 10 percent stiffer front springs and all-round Boge sports dampers. The wheels were forged alloys; 8-inches wide at the front, and 9-inches out back.

The idle speed was raised to 775 rpm and the rev limiter to 6775 rpm.  A sports exhaust system with twin tailpipes was fitted. The power was fed through a five-speed manual gearbox with a shorter gearlever, though to a limited-slip differential with a 2.73:1 final drive.

The 928 Clubsport was indentified by a large ‘CS’ decal on the front left wing.

The 928 Sports Equipment (SE)

The limited-edition SE manual arrived in 1988 followed, a year later, by the equally rare 325bhp GT manual. 1988 saw further development in the story of Porsche’s 928 with the launch of the SE featuring a more powerful uprated 5.0-litre V8 with 320bhp, but more importantly, the introduction of a 5-speed manual gearbox for those who wanted a more sporty driving experience. The SE specification also included twin exhausts, uprated engine and ECU, sports suspension and limited-slip-differential – the ultimate 928 had arrived! Clearly the 928 S4 SE proved itself as a well-rounded car that was easy to live with offering luxury, comfort and performance as it was 24 years later that a decision was made to part with the car. Only 42 Sport Equipment 928s were eventually to arrive in the UK.

Closely related to the predecessor 1987 Clubsport model (left-hand drive only), the 928 SE was offered in limited colors of Grand Prix White, Guards Red, Black, and Silver Metallic. In addition, cars were fitted with lightweight forged alloy wheels, sunroof delete, and a special exhaust system. A limited-slip differential, a close-ratio five-speed manual transmission, sport suspension, and a specially tuned 320 hp, 32-valve engine with higher-profile camshafts were also included. Electrically height-adjustable sport seats in black leather with special black/red pinstripe cloth inlays and red piping add to the unique vehicle. Porsche claimed 0–100 km/h in 5.6 seconds, a significant improvement over the stock car’s 5.9-second time.

We think of the Special Equipment (SE) as a more complete version of the CS, in which some accessories lost in the CS were added back after being taken away (f.i. electrical seat adjustment). It was expected that the 928CS would not sell in the UK market, so Porsche decided to add some equipment back on again. Only 42 SE cars were produced for the UK market only and it sold for about 1500$ more than a CS. Engine number starts with “SP” and a small badge “sport” is located underneath the 928 S4 logo on the rear. There’s a Club Sport (CS) design logo on the front fender. These options were deleted: rear wiper, central locking, cruise control, rear blinds, heated hatch glass, electric seat adjustment, remote hatch release, one mirror, lots of dampening materials, smaller airco compressor, simpler wiring loom, fewer tools, no sun-roof

The 928 CS/SE Are Different from the 928 S4

  • Rolled fender lips front and rear
  • Lightened twin outlet exhaust
  • Shorter shift lever
  • Different intake (same as GTS)
  • GT camshafts
  • 17 mm Rear wheel spacers
  • Short ratio manual transmission
  • Wheels were 8×16(front) and 9×16(rear) “club sport” with an offset of 60mm with 225/50 16(front) and 245/45 16(rear) tires

928 CS/SE is further differentiated from the S4 by the following options (option codes are located on the inside cover of and original owners manual or on a white sticker located in the rear hatch area opposite the spare tire and above the gas tank):

  • 220 – 40% Limited Slip
  • 393 – Forged Alloy Wheels
  • 474 – Sport Suspension
  • 481 – 5-speed transmission

928 CS/SE Specs

  • Capacity: 4957cc
  • Compression ratio: 10.4:1
  • Maximum power: 330bhp at 6200rpm
  • Maximum torque: 430Nm at 4100rpm
  • 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 & tires: Front: 16x8J with xxxxxx tires. Rear: 16x9J with xxxxxxx tires
  • Length: 4470 mm
  • Width 1829 mm
  • Weight: 1450 kg
  • 0-60mph: 5.5 sec
  • Top speed: 171 mph