911 GT3 Cup (Type 991)

The illustrated car shows the concept car (incl. endurance package).

The Porsche 911 GT3 Cup is the racing version of the new 911 GT3 (Type 991). Around the globe this season, the near-standard race car, based on the seventh generation of the iconic 911 sports car, will run in the Porsche Mobil 1 Supercup, in the worldwide Porsche Carrera Cups as well as in key GT3 Cup Challenges.

Background

Powering the Porsche 911 GT3 Cup is a 3.8-litre, six-cylinder boxer engine. Thanks to the weight-optimised modular race exhaust system, the vehicle generates 460 hp (338 KW) at 7,500 revs per minute, ten horsepower more than its predecessor. Power is delivered to the rear axle via a race clutch and a Porsche Motorsport designed six-speed dog-type gearbox with a mechanical limited slip differential. For the first time in a Porsche makes cup race car, gear shifting is performed with paddle shifts on the steering wheel.

In the race department at Weissach, the suspension underwent modifications to ensure higher precision and more stability at high speeds. Compared to its predecessor, the wheelbase grew by 100 millimetres, improving handling at the limit. Porsche Motorsport redesigned the single-piece 18 inch race rims with central locking. The width of the Michelin racing slicks at the front axle grew by two centimetres to now measure 27 cm, and at the rear axle by one cm to 31 cm. The newly-developed racing brake system improves the endurance qualities of the 911 GT3 Cup 991. The internally vented and slotted steel brake discs with a 38-centimetre diameter are operated by aluminium six-piston monobloc racing callipers in the front, and four-piston units at the rear.

Engineers gave the further improvement of driver safety high priority in the development of the new Cup vehicle. Drivers are protected by a redesigned safety cage and race seat, specially moulded around the head and shoulders and individually adjustable with the help of a padding system. A rescue hatch in the roof provides easy access for primary medical attention and for the extrication of the driver. As with the road-legal car, the body of the new 911 GT3 Cup combines highest rigidity with low weight thanks to its smart aluminium-steel composite construction. The latest 911 GT3 Cup weighs in at just 1,175 kilograms.

Porsche builds the new 911 GT3 Cup on the same production line at the Porsche factory in Stuttgart-Zuffenhausen as the road-going 911. At the Motorsport Centre in Weissach, the race car gets a basic set-up for the circuits and is taken through its paces by a professional race driver. The Porsche 911 GT3 Cup is the world’s most-produced and best-selling race car, with well over 2,600 units manufactured since 1998.

Engine

  • Aluminum six-cylinder rear-mounted boxer engine
  • Sealed
  • 3,800 cc; stroke 76.4 mm; bore 102.7 mm
  • Max. power: 338 kW (460 hp) at 7,500 rpm
  • Max. rpm: 8,500 rpm
  • Single-mass flywheel
  • Water cooling with heat management for engine and gearbox
  • Four valves per cylinder
  • Sequential multi-point fuel injection
  • Required fuel quality: minimum 98 octane, unleaded
  • Dry-sump lubrication
  • Electronic engine management (Bosch MS 4.6)
  • Race exhaust system with regulated race catalytic converter
  • Rear silencer with centered exhaust pipe
  • Electronic acceleration pedal

Transmission

  • Porsche six-speed sequential dog-type gearbox
  • Gear ratios:
    Ring & pinion gear 14/22 i = 1.571
    Final drive 17/41 i = 2.412
    1st gear 13/41 i = 3.154
    2nd gear 17/40 i = 2.353
    3rd gear 19/36 i = 1.895
    4th gear 19/29 i = 1.526
    5th gear 24/30 i = 1.250
    6th gear 34/35 i = 1.029
  • Internal pressure-oil lubrication with active oil cooling
  • Limited slip differential
  • Triple-disc sintered metal race clutch
  • Pneumatic paddle shift system

Bodywork

  • Lightweight bodywork with smart aluminum-steel composite construction
  • Welded-in roll cage, in compliance with FIA Homologation Regulations for safety cages
  • Front bonnet with two air inlets for cockpit ventilation and quick fasteners
  • Removable roof section
  • Rescue bar analogue DTM system
  • Modified and widened 911 GT3 fenders
  • Modified rear wheel arches
  • Modified and widened 911 GT3 front-end with spoiler lip
  • Modified 911 GT3 rear-end with integrated rain light, in compliance with FIA Homologation Regulations
  • Lightweight exterior:
    CRP doors with sport-design rear-view mirrors
    CRP rear engine lid with quick fasteners
    CRP rear wing; adjustable
    PC rear window
  • Underbody tray with air routing for brake- and driveshaft cooling in the rear
  • Modified 911 cockpit:
    Magnesium sub-frame in light weight design
    Ergonomic driver-oriented center console
    Switch mask with fluorescent lettering
    Steering wheel with quick release coupling, control panel and shift paddles
  • Race bucket seat with longitudinal adjustment:
    Homologated to latest FIA requirements
    Individual padding system
    Six-point seat belt
    100 liter fuel cell (FT3 safety fuel cell)
    Built-in air jack system (three legs)

Suspension

Front axle:

  • McPherson suspension strut, adjustable in height, wheel camber and track
  • Forged struts:
    Optimized stiffness
    Double shear tie rod connection
    Heavy-duty spherical bearings
  • Wheel hubs with center lock
  • Racing shock absorbers, non-adjustable
  • Forged supporting mounts
  • Double-blade-type anti-roll bar
  • Electrohydraulic power steering

Rear axle:

  • Multilink rear suspension, adjustable in height, wheel camber and track
  • Forged struts:
    Optimized stiffness
    Double shear tie rod connection
    Heavy-duty spherical bearings
  • Wheel hubs with center lock
  • Racing shock absorbers, non-adjustable
  • Forged supporting mounts
  • Double-blade-type anti-roll bar

Brake system

Two independent brake circuits für front and rear axle, adjustable by the driver via brake balance system.

Front axle:

  • Aluminum four-piston racing calipers in mono-bloc design
  • Multi-piece steel brake discs; internally vented and slotted, 380 mm diameter
  • Racing brake pads
  • Optimized ventilation routing

Rear axle:

  • Aluminum four-piston racing calipers in mono-bloc design
  • Multi-piece steel brake discs; internally vented and slotted, 380 mm diameter
  • Racing brake pads
  • Optimized ventilation routing

Rims/Tires

Front axle:

  • Single-piece light-alloy rims according to Porsche specification and design with center lock, 10.5J x 18 ET 28
  • Michelin tires; tire size: 27/65-18

Rear axle:

  • Single-piece light-alloy rims according to Porsche specification and design with center lock, 12J x 18 ET 53
  • Michelin tires; tire size: 31/71-18

Electrics

  • COSWORTH color display ICD
  • COSWORTH electrical system control unit IPS32
  • Electronic throttle system
  • Fire extinguishing system (extinguishing agent: gas)
  • Battery 12 V, 70 Ah (AGM), leak-proof, placed in the co-driver foot well
  • Alternator 150 A
  • Fan in light weight design
  • Wiper with direct drive
  • Lighting system:
    Bi-xenon-headlight
    LED daytime running light
    LED rear lighting system and rain light

Weight/Dimensions

  • Total weight: approx. 1,200 kg
  • Total length: 4,547 mm
  • Total width: 1,851 mm
  • Total height: 1,280 mm
  • Wheel base: 2,458 mm
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