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Porsche - 911 GT3 Cup (Type 997)

911 GT3 Cup (Type 997)

For the 2015 season, Porsche customer teams field the Porsche 911 GT3 Cup (Type 997) in the Carrera Cup Scandinavia as well as GT3 Cup Challenges around the world. This near-standard race car is based on the road-legal lightweight 911 GT3 RS sports car.

Background

The engine of the 911 GT3 Cup is virtually identical to the high-revving normally aspirated unit of the 911 GT3 RS. As with the standard vehicle, the 3.8-litre six-cylinder flat motor puts out 331KW (450 hp). Power is transferred to the rear axle via a six-speed race gearbox, a three-plate sintered metal clutch and a mechanical limited slip differential.

The wide body of the road-going version offers space for large rims and race tyres. The front body panels are similar to the 911 GT3 RS, with the spoiler lip lowered by 15 millimetres. The adjustable rear wing is fitted higher for racing and, at a width of 1.7 metres, considerably wider than the wing of the road-legal car. Due to the popularity of the 911 GT3 Cup for endurance racing, Porsche fitted the car with a 100-litre FT3 safety tank and a fast filling function.

Teams are not permitted to modify the ex-works suspension components, the body, the engine, or the transmission. However, the car can be set up for the respective circuits by adjusting the rear wing and suspension (track, camber, ride-height) within the framework of the regulations.

Engine

  • Normally aspirated engine
  • Water cooled flat six-cylinder boxer engine with four valves per cylinder
  • 3,797 cc; stroke 76.4 mm; bore 102.7 mm
  • Max. power: 331 kW (450 hp) at 7,500 rpm
  • Max. rpm: 8,500 rpm
  • Required fuel quality: 98 octane ROZ, unleaded
  • Dry-sump lubrication
  • Sequential multi-point fuel injection
  • Electronic engine management MS 3.1 by Bosch
  • Race exhaust system with regulated race catalytic converter
  • Twin-branched muffler with centred exhaust pipes
  • Standard delivery without front muffler

Transmission

  • Six-speed sequential dog-type gearbox with active oil cooling and pressure-oil lubrication
  • Gear ratios:
    Ring & pinion gear 8/32 i = 4.000
    1st Gear 12/38 i = 3.167
    2nd Gear 15/32 i = 2.133
    3rd Gear 18/31 i = 1.722
    4th Gear 20/28 i = 1.400
    5th Gear 23/26 i = 1.130
    6th Gear 29/27 i = 0.931
  • Limited slip differential 37 % drive / 52 % overrun
  • Single-mass flywheel
  • Race clutch (5½“ triple-disc sintered-metal clutch)
  • Hydraulic clutch centre-release mechanism
  • Oil-water heat exchanger

Bodywork

  • Weight optimised, widened body shell based on 911 GT3 RS II. Generation
  • Enlarged rear wheelhouses for tyre sizes of 690 mm diameter
  • Aerodynamically optimised front splitter
  • Additional cockpit ventilation through air inlet in front bonnet
  • CfC doors with window frame and synthetic rear-view mirrors
  • CfC rear lid with integrated rain light
  • CfC rear wing adjustable
  • Synthetic rear centre compartment
  • Modified, synthetic rear body panels
  • Polycarbonate rear window, rear side windows and door windows
  • Built-in air jack system with safety pressure valve
  • Welded-in roll cage according to DMSB regulations
  • Race bucket seat (driver side only) with fire retardant upholstery
  • Six-point seat belt optimised for use with HANS
  • Multifunctional steering wheel with quick-release coupling
  • Fire extinguishing system with electronical release device
  • 100 litre fuel cell (FT3 safety fuel cell), returnless fuel with five bar fuel-pressure regulator

Suspension

Front axle:

  • McPherson strut-type axle, height-adjustable
  • Front axle wheel suspension with twin-clamp system
  • Double coil springs with race setup (main spring and helper spring)
  • Sachs gas pressure shock absorbers
  • Sachs gas pressure shock absorbers • Front axle control arm with six-point-suspension
  • Two-piece lower control arms for camber adjustment
  • Longitudinal control arm
  • Double-blade-type anti-roll bar, seven setting options per side
  • Forged supporting mounts with Unibal
  • Reinforced, continuously adjustable track rod
  • Power steering with electro-hydraulic pressure feed
  • Modified steering-column assembly (adjustable in height and length)

Rear axle:

  • Multilink rear suspension with solidly mounted subframe
  • Suspension struts height-adjustable
  • Wheel suspension with optimised wheel hub
  • Double coil springs with race setup (main spring and helper spring)
  • Sachs gas pressure shock absorbers
  • Modified axle side parts
  • Two-piece lower control arms for camber adjustment
  • Unibal - suspended control arm (top)
  • Longitudinal control arm
  • Double-blade-type anti-roll bar, seven setting options per side
  • Reinforced, continuously adjustable track rod

Brake system

Two independent brake circuits, adjustable via brake balance system and two master brake cylinders.

Front axle:

  • Aluminium six-piston callipers in red
  • Steel brake discs (compound moulding) internally vented, 380 mm diameter
  • Special race brake pads without wear indicator
  • Optimised ventilation routing

Rear axle:

  • Aluminium four-piston callipers in red
  • Steel brake discs (grey cast iron) internally vented, 350 mm diameter
  • Special race brake pads without wear indicator
  • Optimised ventilation routing

Rims/Tires

Front axle:

  • Centre-lock aluminium rims 9,5J x 18 ET 37
  • Michelin tyres

Rear axle:

  • Centre-lock aluminium rims 12J x 18 ET 30
  • Michelin tyres

Electrics

  • Motec Dashboard ADL2 with integrated data recording, 1 MB main memory
  • Battery: 12 V, 50 Ah
  • Alternator 90 A
  • Error detecting
  • H7 main headlight and daytime running light
  • Rear lights in LED-technology

Weight/Dimensions

  • Approx. 1,200 kg (with steel brake discs, without front muffler)
  • Total length: 4,475 mm
  • Total width: 1,880 mm
  • Total height: 1,280 mm
  • Wheel base: 2,357 mm