The Porsche 911 GT2

Press Release

Staggering Power and Performance While the 911 GT2 shares its basic powerplant with the 911 Turbo, the dual turbochargers provide an even greater throughput of air, allowing an increase in turbo boost pressure under full load to 14.5 psi (1.0 bar over atmosphere), compared to 11.76 psi (0.8 bar) for the 911 Turbo. Larger-capacity intercoolers keep the air charge temperature consistent despite the increased boost pressure. At the GT2 engine’s power peak speed of 5,700 rpm, boost pressure reaches 13.8 psi (0.95 bar) and then peaks at 14.5 psi (1.0 bar) over 6,200 rpm. As a result, the GT2 maintains an almost consistent power level even above the engine’s power peak speed, despite the increase in exhaust backpressure at such high speeds. Maximum engine speed is 6,750 rpm, same as the 911 Turbo. The GT2 engine produces maximum torque of 457 lb.-ft. (620 Nm) from 3,500-4,500 rpm for response normally associated with engines of far larger displacement. In comparison, the 911 Turbo produces 415 lb.-ft. of peak torque from 2,700-4,600 rpm. VarioCam Plus As on the 911 Turbo, the 911 GT2 engine employs the VarioCam® Plus variable valve lift and timing system. Axial camshaft adjustment provides variable intake valve timing, while variable lift is achieved using two switching cup tappets on the intake side operated by two different size lobes on the intake camshaft. VarioCam Plus serves, first, to optimize engine output and torque and, second, to improve fuel economy and exhaust emissions as well as the engine’s smoothness and refinement. Dry Sump Oil System Typical of racecar practice a so-called dry sump lubrication system with a separate oil tank fitted directly to the engine ensures a reliable supply of oil. Optimized design and configuration of the oil pumps in conjunction with the right capacity of the oil tank ensures that the engine receives a reliable oil supply even under extreme acceleration, braking and cornering. The oil volume within the entire system is approximately 11.6 quarts (11 liters). Except for mufflers with less backpressure, the exhaust system is essentially the same as in the 911 Turbo. Like the 911 Turbo, the 911 GT2 complies with the U.S. Low Emissions Vehicle (LEV) standard. Manual Transmission Only Power is transmitted to the rear wheels of the 911 GT2 by a six-speed manual gearbox. An evolutionary version of the transmission from the 911 Turbo, this unit uses external transmission oil cooling and injection oil lubrication. The Tiptronic S five-speed automatic transmission is not available for the GT2. The ratios of the individual gears as well as the final drive are the same as on the 911 Turbo, as are the various design features ensuring greater stiffness and enhanced noise control. The synchronizer rings on the gears are made of steel instead of brass to provide even greater durability. The GT2 uses a special asymmetric limited-slip differential, which provides up to 40-percent locking under power. On overrun, the differential provides up to 60-percent locking, which helps stabilize the car in curves under load changes. Modified Suspension The suspension of the GT2 is designed to cater to an even higher level of performance than the suspension of the 911 Turbo. Modifications include fitting racing springs that lower the center of gravity by 0.78-inch (20 mm), adjustable anti-roll bars and an even wider range of suspension geometry adjustment to accommodate racing tires. The GT2 uses reinforced components throughout its suspension systems, including all bearings. Spring and shock absorber settings are firmer than on the 911 Turbo. In the front, the damper struts use threaded spring plates that provide adjustable height and fine-tuning for racetrack driving. Uniball joints on the strut support mounts minimize axle kinematics when the springs are compressed and also allow wheel camber adjustments needed for using racing tires. For more precise spring and shock absorber response, the multilink rear suspension substitutes metal bushings for the rubber bushings used in the 911 Turbo. As in the front, threaded spring plates provide height adjustment. In addition, the rear anti-roll bar features four adjustment settings. Widest Porsche Tires Ever The Porsche 911 GT2 employs larger wheels and tires than even the 911 Turbo. The front alloy wheels measure 18 x 8.5-inch (vs. 18 x 8.0-inch for the 911 Turbo) and mount 235/40 ZR18 tires (225/40 ZR18 for the 911 Turbo). The rear alloy wheels measure 18 x 12-inch (18 x 11-inch for the 911 Turbo) and mount super-wide 315/30 ZR18 tires (295/30 ZR18 for the 911 Turbo). Instead of a spare tire, the GT2 comes with a tire repair kit, saving 29 lb. (13 kg) and also adding some luggage space. The kit includes a bottle of tire sealing foam, an air compressor and a pressure gauge.