Turbo Cup

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According to Porsche AG, “… the 944 Turbo Cup Porsche starts the tradition of the single-marque trophies with near-standard cars.” While the Turbo Cup cars were essentially stock Porsche 944 Turbos, the cars were slightly modified for racing. The cars featured the same 2.5 liter engine found on the road cars, and horsepower and torque were more or less consistent with the road cars. However, the use of a magnesium oil sump (as opposed to the standard aluminum), a smaller generator, and a modified turbocharger and associated engine components meant that the car was more lively, and better suited to the track.

Like the Turbo S (which followed many cues from the Cup series cars), the synchromesh five-speed gearbox was reinforced. Likewise, harder adjustable suspension (provided by Bilstein) and larger anti-roll bars (27mm front, and 21mm rear), and an additional spring at the rear axle meant that the Cup cars were more responsive than the standard Turbo, and the racing components allowed for numerous adjustment possibilities among the competing cars. Interestingly, the Turbo Cup cars relied on a modified ABS system (the Cup cars used a “switchable ABS” system, as opposed to going without ABS, as is the case with many competition series). The Turbo Cup cars also relied on wider tires (245/45 VR 16s in front, and 255/40 VR 16s in the rear).

However, the Turbo Cup cars were also markedly different than their road-going counterparts. Besides a lack of power steering (arguably superior for racing), the Cup cars were stripped of many interior components including the glove box, door pockets, radio console, and climate control systems. The driver side was fitted with a racing seat (by Recaro), while the passenger seat remained stock. The rear seats were removed, as was any sound deadening interior components. Moreover, the rear window wiper and the rear hatch release were removed, and the electronic windows were swapped out for manual ones. All of this, of course, was to reduce the weight of the car. For safety reasons, the car was also installed with an 8-point roll cage. The cage also provided for more torsional rigidity, which was further increased by reinforcing the front chassis rails.

Engine:

  • Powerplant: 8 valve sohc in-line 4
  • Power: 220 bhp at 5800 rpm
  • Displacement: 2.5 liters

Fuel system:

  • Fuel system: Bosch Motronic (80 liter tank)
  • KKK K-26 #8 turbocharger

Transmission:

  • 5-speed manual transmission with differential, external oil cooler, single plate dry clutch (with magnesium transmission components)

Chassis:

  • two-door coupe body, two-plus-two seater, tailboard at rear, integral steel body

Suspension:

  • Bilstein-based suspension (as opposed to the Koni suspension featured on the Turbo S)
  • Front: independent wheel suspension on aluminum wishbones and spring struts with stabilizers
  • Rear: independent wheel suspension on aluminum semi-trailing arm and horizontal anti-roll bar with stabilizers

Brakes:

  • Hydraulic dual-circuit brake system, front/rear axle distribution, brake booster, 4-piston aluminum test brake caliper pliers front and rear with internally vented brake discs (similar to the 928 S-4 brakes featured on the Turbo S)

Dimensions and weight:

  • Wheelbase: 2400 mm
  • Length: 4230 mm
  • Width: 1735 mm
  • Weight: 1280 kg

Performance:

  • 0-60 mph: ~4.9
  • top speed: 152 mph/245 km/h

[Note]Further reading: see article “A Tasmanian Turbo Cup,” for details on a special Australian Turbo Cup car owned by David Morton and Malcolm McDonald.

[Note]Note to readers: this article is a stub. I hope to expand this article to encompass some information on the Turbo Cup series (both in North America and overseas). I also plan to focus on specific cars, such as the Rothmans Turbo Cup car (and to provide technical documents related to Rothmans). However, information is generally hard to come by. If any reader has information about the Turbo Cup series, about Turbo Cup cars (like Rothmans Cup car), the author would appreciate they share it so that the resource might be more comprehensive. Your contributions will not go unrecognized. Any information or media can be emailed here.