Close

    • Porsche officially places the GT3 3.8 flat-6 in the 718 chassis - Cayman GT4 Clubsport and GT4 Rallye Concept

      Before you get too excited note Porsche has a 718 rally car built by Porsche to compete under FIA R-GT regulations for the 2020 season. This is in addition to a GT4 Clubsport for the roadcourse. The good news is Porsche is utilizing the GT3's naturally aspirated flat-6 in the 718 Cayman chassis in multiple applications meaning a street car is likely.


      This essentially gives factory credence to all those GT3 flat-6 into the 718 Boxster/Cayman rumors. Treat these cars like a demo for a street GT4 with the same powerplant.

      Porsche more or less confirms that this rally car is based on a GT4 Clubsport:

      Quote Originally Posted by Porsche
      In contrast to the concept vehicle, the future rally car will not be based on the Cayman GT4 Clubsport built up to 2018, but on the new 718 Cayman GT4 Clubsport unveiled in early January. The new customer sport racer, designed for GT4 series as well as clubsport and track day events, is powered by a 3.8-litre flat-six engine producing 313 kW (425 hp). In developing the vehicle, the focus was put on performance, driveability and sustainability. In the construction of the Porsche 718 Cayman GT4 Clubsport, several body parts were made of natural-fibre composite material for the first time.

      The appearance of the Porsche Cayman GT4 Rallye Concept Car at the 2018 Rallye Deutschland yielded positive feedback. The response from the rally fan camp, teams, drivers and series organisers was a decisive factor in going ahead with the new development programme. The comparatively low operating cost of the new R-GT-regulation vehicle is a major advantage, thanks to its close affinity to the production car.
      Would Porsche invest in two 718 variants for racing without a street version to parlay all that development into? Doubtful.










      Concept


      • Single-seater, near-standard production-based race car, not road homologated


      Engine

      • Aluminium six-cylinder mid-positioned boxer engine with rigid mounting
      • 3,800 cc; stroke 77.5 mm, bore 102 mm
      • Max. power: 313 kW (425 hp) at 7,500 rpm
      • Max. rpm: 7,800 rpm
      • Max. torque: 425 Nm at 6,600 rpm
      • Compression ratio: 12.5:1
      • Racing optimised water cooling with thermal management for engine and gearbox
      • Four-valve technology with adjustable camshaft phasing and variable valve timing VarioCam Plus
      • Fuel quality: Super Plus unleaded, minimum 98 octane
      • Racing optimised electronic engine management (Continental SDI 9)
      • Integrated dry sump lubrication
      • 100-cell metal catalytic converter complying with DMSB specifications


      Transmission

      • Rear wheel drive
      • 6-speed PDK gearbox with rigid suspension and electronic control unit optimised for racing
      • Reinforced dual mass flywheel
      • Internal pressure oil lubrication with active oil cooling
      • Differential lock optimised for racing


      Bodywork

      • Lightweight body in aluminium-steel composite construction
      • Welded-in roll cage, certified according to FIA Art. 277
      • Front bonnet with quick release fasteners
      • Rear hood with quick release fasteners
      • Fixed rear wing with “swan neck” mount made of natural-fibre composite materials, including the sideblades, black aluminium wing supports with integrated carbon fibre Gurney flap
      • Driver and co-driver doors of natural-fibre composite materials
      • Roof including escape hatch, certified according to FIA Art. 275a
      • Recaro race bucket seat with longitudinal adjustment and padding system, adjustable to the individual needs of the drivers (in accordance with FIA Standard 8862/2009 – the latest FIA requirements)
      • Three-piston air jack system (“Competition”)
      • Pre-installed mounting points for three-piston air jack system (“Trackday”)
      • Provision for safety net
      • FIA-certified towing loops, front and rear
      • Motorsport centre console with enhanced functionality and adapted usability
      • Six-point safety harness
      • 115-litre FT3 safety fuel cell with “Fuel Cut Off” safety valve complying with FIA regulations (“Competition”)


      • 80-litre FT3 safety fuel cell with “Fuel Cut Off” safety valve complying with FIA regulations (“Trackday”)


      Suspension

      Front axle:

      • MacPherson suspension strut, adjustable in height, camber and track
      • Forged suspension links: optimised stiffness, double shear mounting, high-performance spherical bearings
      • 5-bolt wheel hubs
      • Racing 3-way shock absorbers with rebound and 2-stage compression adjustment, high and low speed (“Competition”)
      • Fixed shock absorbers (“Trackday”)
      • Electromechanical power steering with variable steering ratio
      • Anti-roll bar, 3-hole design


      Rear axle:


      • MacPherson suspension strut, adjustable in height, camber and track
      • Forged suspension links: optimised stiffness, double shear mounting, high-performance spherical bearings
      • 5-bolt wheel hubs
      • Racing 3-way shock absorbers with rebound and 2-stage compression adjustment, high and low speed (“Competition”)
      • Fixed shock absorbers (“Trackday”)
      • Adjustable blade-type anti-roll bar


      Brake system

      Front axle:

      • Aluminium, mono-bloc six-piston racing callipers with “Anti Knock Back” piston springs
      • Steel brake discs, multi-piece, ventilated and grooved, 380 mm diameter
      • Racing brake pads
      • Brake balance adjustment via a balance bar system (“Competition”)
      • Brake booster (“Trackday”)


      Rear axle:


      • Aluminium, mono-bloc four-piston racing callipers with “Anti Knock Back” piston springs
      • Steel brake discs, multi-piece, ventilated and grooved, 380 mm diameter
      • Racing brake pads
      • Brake balance adjustment via a balance bar system (“Competition”)
      • Brake booster (“Trackday”)


      Electrics

      • COSWORTH instrument cluster ICD with integrated data logger
      • Upgraded fault diagnosis with PIWIS motorsport tester
      • Porsche Track Precision Race App
      • Integrated lap trigger via GPS signal
      • Electronic throttle system
      • Lightweight lithium-ion (LiFePo) battery, 60 Ah, leak-proof, mounted in passenger footwell (“Competition”)
      • Battery 12 V, 70 Ah (AGM), leak-proof, mounted in passenger footwell (“Trackday”)
      • Emergency cut-off switch in cockpit and outside left of the windscreen
      • Driving stability system PSM (Porsche Stability Management) with ABS, traction Control (TC) and Electronic Stability Control (ESC), able to be completely deactivated
      • Tyre pressure monitoring system (TPMS)
      • Central fire extinguishing system in accordance with FIA regulations (“Competition”)
      • Handheld fire extinguisher (“Trackday”)
      • Air conditioning
      • Electric wing mirror adjustment
      • Multifunctional CFRP motorsport steering wheel with pit speed limiter and quick release coupling (“Competition”)
      • Multifunctional motorsport steering wheel with pit speed limiter (“Trackday”)
      • Centre console with map switch to adjust the ABS, ESC, TC and switch between preset tyre circumferences


      Weight/dimensions

      • Total weight: 1,320 kg
      • Total length: 4,456 mm
      • Total width: 1,778 mm
      • Total height: 1,238 mm
      • Wheelbase: 2,456 mm


      Rims/Tyres

      Front axle:

      • One-piece light-alloy forged wheels in new weight-optimised rim design, 9J x 18 offset 28 with 5-bolt mounting
      • Delivered with Michelin transportation tyres, dimension: 25/64-18
      • Michelin slick/wet tyres, dimension: 25/64-18


      Rear axle:


      • One-piece light-alloy forged wheel in new weight-optimised rim design, 10.5J x 18.5 offset 53 with 5-bolt mounting
      • Delivered with Michelin transportation tyres, dimension: 27/68-18
      • Michelin slick/wet tyres, dimension: 27/68-18


      Colours

      • Water-based paint
      • Exterior: white C9A
      • Interior: white filler-coat, without lacquer


      Delivery
      From February 2019

      This article was originally published in forum thread: Porsche officially places the GT3 3.8 flat-6 in the 718 chassis - Cayman GT4 Clubsport and GT4 Rallye Concept started by Sticky View original post