You might first want to check the Cayman 981 previous versions
Porsche Cayman 981 GT4 street legal (2015-2016)
Date of unveil by Porsche AG: February 4, 2015
Premiere: March 3, 2015 Geneva Motor Show
World market launch: March 2015
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-
|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.
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.
© James Herne / Stuttcars.com
PDF 2015/02 Cayman GT4 In German/Deutsch (7 MB)