2021 Porsche 911 GT3 Cup

At the same time, the seventh generation of the Cup racer generates noticeably more aerodynamic downforce. This is thanks to the combination of the rear spoiler with the larger rear wing and front apron, which was specifically adapted to racing by means of a front lip spoiler and strategically-positioned separation edges. The eleven-stage adjustable rear wing with a ‘swan neck’ mounting ensures uninterrupted under-wing airflow. This improved aerodynamic efficiency also ensures more stable handling, especially in fast corners.

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The body of the 991.2 generation Cup car consisted of 70 per cent steel and 30 per cent aluminium. The ratio in the successor has been switched. The fact that the vehicle still weighs around 35 kilograms more with a dry weight of 1,260 kilograms is due, for example, to extra struts being added to the steel safety cell. The removable escape hatch in the roof complies with the latest FIA standards. All windows in the GT3 Cup are made of lightweight polycarbonate and have scratch-resistant hard-coat glazing. The doors, engine hood and rear wing are made of carbon-fibre reinforced plastic. In contrast, the front hood with its distinctive exit-air duct and central air intake is a prime example of the intelligent use of materials: Like in the 911 Carrera, it is made of aluminium – which lowers repair costs in the case of an accident.

The designers put a lot of thought into the ergonomics specifically for the drivers. In addition to the incline, the new racing seat can now be adjusted in two height settings. In conjunction with the adjustable steering column, this ensures an ideal fit for every driver stature. A range of padding thicknesses allows the seats to be adapted to the needs of individual drivers. The redesigned, open-top, motorsport multifunction steering wheel made of carbon-fibre is yet another development adopted from the 911 GT3 R. Following drivers’ feedback, its illuminated buttons have been rearranged. The so-called Rubber Switch Panel (RSP) with its ten large buttons on the right is reminiscent of a control element in the Porsche 919 Hybrid. These buttons are easy to use, even in the heat of the race and are given designated central functions such as lighting and ventilation or to change tyre settings from dry to wet tyres. One example of a clever enhancement to details is the adjustment of brake balance: Now, it can be intuitively controlled via a rotary knob switch on the outside right of the RSP in or against the direction of travel – depending on whether the front axle needs more or less brake pressure.

The designers have revamped the centrally-positioned, 10.3-inch colour monitor. The screen prioritises the display of key data and information for the driver while racing. Displayed alongside the engine revs are water and oil temperatures, the gear currently engaged and error messages or information on important baseline settings, such as “wet” for racing in rain. After the readout of the data, the design of both the display and the computer monitors are aligned so that the driver and race engineer see the same information. This helps with analyses after each session.

The electronics are designed to be user-friendly for easier error analyses and specific help in problem-solving. Around 700 diagnostic options are available. Specific software summarises all information more clearly and comprehensibly. Optional vehicle functions such as ABS or traction control are already stored in the system. They can be activated via a digital code. In the Porsche Mobil 1 Supercup and in most national Carrera Cups, these driving aids are switched off: in these championships, the talent of the drivers alone is what counts.

Another example of subtle, sophisticated solutions in the new 911 GT3 Cup can be seen in the arrangement of the electronic components: Motorsport control units and data loggers have been relocated from the passenger footwell to the right rear compartment. As a result, they no longer hinder the installation of a second seat, for instance when ‘racing taxi drives’ are required.

The suspension of the Cup 911 offers the finest in racing technology. While the rear axle essentially remains unchanged compared to the production model, the front wheels are now controlled by double wishbones and Uniball bearings – like in the 911 RSR, Porsche’s current top racing model. Through this, the dampers are no longer exposed to lateral forces, only axial forces. This ensures more precise turn-in behaviour and gives a better feeling for the front axle. The shock absorbers have also inherited the cutting-edge valve technology from the 919 Hybrid and 911 RSR. Fully electro-mechanical power steering has been introduced into the Porsche 911 GT3 Cup for the first time. This means that the hydraulic pump and associated hydraulic lines are no longer needed.

2021 Porsche 911 GT3 Cup Interior Detail

In terms of the engine, the Porsche 911 GT3 Cup remains true to the naturally aspirated principle. In the racing version, the four-litre, water-cooled flat-six engine develops 375 kW (510 hp). Its high-revving unit with dry-sump lubrication reaches top performance at 8,400 rpm – up from the previous 7,500 rpm. It redlines at 8,750 rpm with maximum torque of 470 Newton metres at 6,150 rpm. A single throttle butterfly system with two resonance flaps ensures an even more spontaneous response, and in conjunction with the catalytic converter racing exhaust system, produces an awe-inspiring sound. Three different exhaust systems are available to choose from – depending on the racing series, the regulations and the racetrack. Bosch supplies the MS 6.6 electronic engine management system.

Like with its immediate predecessor, the six-cylinder only needs a maintenance check after 100 hours of track time. The engine is connected to the sequential, 72-kilogram six-speed dog-type gearbox via a single-mass flywheel and a three-plate sintered metal racing clutch. Gear changes are made via a paddle shift on the steering wheel, with a “minor inspection” of the gearbox needed after 60 hours of racing – which corresponds to roughly two years in the Porsche Mobil 1 Supercup. A major overhaul is due after 120 hours of racing. The shift barrel actuator is operated by an electric servo-motor, replacing the previous pneumatic unit. The advantage: even faster gear changes, the option of live diagnoses and a lowered risk of damage, for example in the event of gearshift errors.

The special attention given to detailed improvements is reflected in the Porsche 911 GT3 Cup in many other optimisations:

• Every Cup car from Porsche Motorsport is now delivered with a complete accessory kit, which includes, for example, all special tools and wishbone spacers required for track adjustment. Hence, the ex-works 911 GT3 Cup is ready to race without customer teams having to order these parts individually.
• In the new model generation, the water radiators remain directly behind the front apron. This positioning was deliberately retained: the risk of damaging the radiators prevents an overly aggressive driving style. At the same time, the placing of a strut ensures that minor nudges go unpunished.
• Special brake callipers now enable the brake pads to be changed faster.
• The drive shafts of the rear axle now have a special, more durable motor racing design.
• Textile loops have been reintroduced as attachment points for tow ropes. These replace the previously used steel swivel tow hooks.
• A new central nozzle for the fire extinguishing system improves the distribution of the extinguishing agent inside the cockpit.
• The new positioning of the release unit makes it easier for scrutineers to check from the outside whether the fire extinguisher is working correctly.
• Adapted safety quick releases for the inside door openers improve the ergonomics when exiting the cockpit as well as safety in the event of an emergency.
• The onboard electrical system functions without actual plug fuses. This reduces the amount of materials used in the wiring harness and saves weight. The redesign is easier to access thanks to its central positioning.
• Should the engine stall at the start of the race, the hazard warning lights switch on automatically to warn other competitors of the danger.

Technical specifications Porsche 911 GT3 Cup (992) model year 2021

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•  Concept
  • Single-seater customer racing car
• Weight / Dimensions
  • Total weight: ca. 1,260 kg
  • Length: 4,585 mm
  • Width: 1,920 mm (front axle) / 1,902 mm (rear axle)
  • Wheelbase: 2,459 mm
• Engine
  • Water-cooled six-cylinder boxer rear engine; displacement 3,996 cm3; stroke 81.5 mm; bore 102 mm; ca. 375 kW (510 hp) at 8,400 rpm; max. torque 470 Nm at 6,150 rpm; max. rpm 8,750; four-valve technology; single throttle butterfly system; intake manifold with two resonance flaps; engine control unit Bosch MS 6.6; dry-sump lubrication; single-mass flywheel; race exhaust system with DMSB certified catalytic converter; fuel quality: Superplus unleaded, to E20 (min. 98 octane).
• Transmission
  • Porsche six-speed sequential dog-type gearbox; paddle shift with electronic shift barrel actuator; mechanical limited slip differential; three-plate sintered metal racing clutch.
• Body
  • Lightweight body featuring intelligent aluminium-steel composite design; mounting points for lifting device; removable rescue hatch in roof; welded-in roll-cage, approved for co-driver use on circuits; seat in accordance with FIA Standard 8862/2009, infinite longitudinal adjustment, two positions for height and inclination; six-point racing safety harness, for use with HANS®, adjustable steering column with steering angle sensor; front cover with integrated quick-release fasteners, cooler exit-air duct and central air intake for cockpit ventilation; widened front bumper with spoiler lip; fenders with extensions; rear bodywork with integrated rain light in accordance with FIA regulations; doors, rear cover and rear wing of CFRP; rear wing with ‘swan neck’ mounting, adjustable in 11 positions; polycarbonate windows with hard coating; air-jack system with three jacks; valve mounting points on either side of the car; 110-litre FT3 safety fuel cell in the front.
  • CFRP interior trim panels, multifunctional CFRP motorsport steering wheel with quick-release coupling, shift paddles and illuminated push buttons; ergonomic digital touch panel with multi-colour backlight; safety nets (centre and driver’s side) in accordance with latest FIA safety regulations; preparation for seat ventilation; fire extinguisher system with electronic release unit.
• Suspension
  • Forged aluminium control arms & top mounts, stiffness optimised; heavy-duty spherical bearings with dust protection; wheel hubs with centre-lock wheel nut; shock absorbers with motorsport-specific valve characteristic; double-blade-type adjustable anti-roll bars; tyre pressure monitoring system.
• Front axle
  • Double wishbone front suspension, adjustable ride-height, camber and toe;
  • Electro-mechanical power steering with manoeuvring function.
• Rear axle
  • Multi-link rear suspension, adjustable in ride-height, camber and toe;
  • Motor racing drive shafts optimised for reliability and durability.

2021 Porsche 911 GT3 Cup

• Brake system
  • Two independent brake circuits incorporating front and rear axle brake pressure sensors, driver adjustable brake force distribution via brake balance system; racing brake pads; optimised brake ducts; ergonomic brake pedal positioning.
  • Front axle: Six-piston aluminium monobloc racing brake callipers with ‘anti knock-back’ piston springs; ventilated 380 mm x 32 mm steel brake discs mounted on aluminium disc bells; aluminium brake disc chamber.
  • Rear axle: Four-piston aluminium monobloc racing brake callipers with ‘anti knock-back’ piston springs; ventilated 380 mm x 32 mm steel brake discs mounted on aluminium disc bells; aluminium brake disc chamber.
• Wheels / Tyres
  • Front axle: Single-piece centre-lock alloy wheels conforming to Porsche specification and design, 12J x 18; tyre dimension 30/65-18
  • Rear axle: Single-piece centre-lock alloy wheels conforming to Porsche specification and design, 13J x 18; tyre dimension 31/71-18.
• Electrical system
  • Porsche Logger Unit; Porsche Power Box, 10.3 inch Porsche colour display; lightweight, leak-proof LiFePO4 battery 12V, 60 Ah in passenger footwell; 175 A alternator; digital touch panel with multi-colour backlight; single-arm windscreen wiper with direct drive (intermittent and continuous operation); three additional centre console switches for additional power consumers; data connection (data logger, video system).
  • LED main headlights and daytime running lights; taillights and rain light in LED technology.

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