Porsche Cayman 981 GT4 Street version (2015-2016)

Date of unveil by Porsche AG: February 4, 2015
Premiere: March 3, 2015 Geneva Motor Show
World market launch: March 2015

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Technical specification and comparison

Modification Engine kW lb-ft Nm Gearbox 60 mph 100 km/h 160 km/h 200 km/h mph km/h DIN kg DIN lb W/lb W/kg Nord-
schleife
Cayman 981 GT4 3.8B6 283 309 420 manual 6-speed 4.2 sec. 4.4 sec. 9.3 sec. 14.5 sec. 183 295 1340 2954 96 211 7:40...45
911 991 GT3 3.8B6 350 324 440 PDK 7-speed 3.3 sec. 3.5 sec. 7.5 sec. 11.4 sec. 196 315 1430 3153 111 245 7:30

DIN weight = car with 90% fuel, no driver, no cargo. Weight of German versions with standard equipment.

GT4 is basically a Cayman body with the chassis of the 991 GT3 and the engine of the 997.2/991 Carrera S. Its official power figures correspond to the 997.2 S, but really are of the 991 S with sports exhaust system. To fit into the Cayman, the 911 engine had to be modified a bit, so it got different crankcase and naturally different intake system. The Carrera S/GT4 engine is not a full dry sump engine like the one in the GT3. The Nürburgring Nordschleife lap time in the region of 7:40 tells all about the GT4. The fact that the automatic gearbox (PDK) is not available, makes clear for whom this car is destined - to the Porsche drivers who enjoy the joy and engagement of really driving the Porsche. The GT3 chassis makes the GT4 1.2"/30 mm lower than standard Cayman. The GT4 is equipped with the best road legal racing tyres, the Michelin Pilot Sport Cup 2. The brakes are also directly from the 991 GT3, with 380 mm discs front and rear. Like with the GT3 (or any other racing car), the interior is only available in black for minimum distraction for the driver. The GT4 is 38% cheaper than the GT3, but the Nürburgring Nordschleife lap time is more or less the same compared to the old GT3s.

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The concept, the front spoiler look and the side air scoops remind a bit of the Lotus Exige© Porsche
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Christian Gebhardt has lapped the Nürburgring Nordschleife in 7:42,39 (Sport Auto 5/2015, Supertest)© Porsche
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Porsche Cayman 981 GT4 side air inlet scoop
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The forged wheels are 20", the fronts are 8.5" wide with 245/35 tyres and the rears are 11" with 295/30© Porsche
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Porsche calls it a 'diffusor-look' rear under valance, so it is not an aerodynamic item© Porsche
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Who could resist getting in and out to the track...© Porsche
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Porsche Cayman 981 GT4 rear spoiler
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Porsche Cayman 981 GT4 wheel and brake
The wheel design mimics that of the 991 GT3, but has conventional easy-to-live-with 5-bolt arrangement instead of the central locking system© Porsche
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Michelin Pilot Sport 2 road legal racing tyres© Porsche
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The Sport-button activates automatic throttle-blipping for downshifts © Porsche
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Porsche Cayman 981 GT4 cockpit, bucket seats
The bucket seats must be specified first and then the Club Sport roll cage can be ordered© Porsche
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Bucket seats and Club Sport package (roll cage, 6-point harness, fire extinguisher and preparation for battery disconnection switch)© Porsche
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Optional adaptive sports seat, standard sports seat and optional bucket seat© Porsche
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Porsche Track Precision App saves the video and telemetrics © Porsche
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Porsche Cayman GT4 3.8-litre engine
283 kW 3.8-litre 6-cylinder boxer of the 997.2 Carrera S used in the Cayman GT4. The same engine was also used in 991 Carrera S (294 kW).© Porsche
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Andreas Preuninger, head of GT cars at Porsche, interviewed by EVO

The standard equipment of the GT4 includes sports exhaust, PTV Porsche Torque Vectoring (brakes the rear inner wheel for quicker cornering), limited slip differential (with asymmetrical locking, 27% in acceleration, 22% in decelaration), variable ratio electric power steering, PASM Porsche Active Suspension Management, dynamic transmission mounts, adjustable racing suspension (toe, camber, stabilizers), 20" wheels painted in Platinum (optionally in Silver or Black), TPM Tyre Pressure Monitoring, electric parking brake, Black Design bi-xenon headlamps, air conditioner (deletion of AC or 2-zone automatic AC are both optional), sports seats, 918-style steering wheel, CD-radio with 7" touchscreen incl. universal audio interface in glove compartment and 4 speakers (deletion of audio system is at no cost). To shave a bit from the officially announced DIN curb weight (measured with 90% fuel), the standard fuel tank has only 54 litre capacity. In reality all cars would naturally have the no-cost 64 litre tank, which isn't very large either. From the optional equipment list the following could be needed: adaptive sports seats or bucket seats, Club Sport package (roll cage behind the seats, a 6-point racing harness in red for driver's side, a bigger fire extinguisher with mounting bracket and preparation for battery master switch). The optional equipment list continues with 6-point harness for the passenger, cruise control, stitchings in red or yellow, 9 speaker sound system (heavy Bose system naturaly not available for a track day car), navigation. The stop-watch in the Sport Chrono package still is useless as it is still unable to use the GPS signal from the onboard navigation system. Much better (GPS-based) systems are available for lap timing. For example, from the App Store you can download the free Porsche Track Precision app for your smartphone. In addition to lap timing it communicates with the car for telemetrics (Sport Chrono package needed). The front part of the roll cage, the structural cross behind the seats, the battery master switch and the track day laptrigger can be purchased from Porsche Motorsport.

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Cayman 981 GT4 wrapped for delivery
Wrapped for transport © Porsche

© James Herne / Stuttcars.com


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Cayman GT4

2/2015 · German

Cayman GT4 3.8

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