The Porsche 911 GT3 is a higher performance version of the Porsche 911 sports car. It is the latest in a line of high-performance models, beginning with the 1973 911 RS. The GT3, named after the Fédération Internationale de l'Automobile GT3 European Championship it was designed to compete in, has a 3.6-litre naturally aspirated six-cylinder engine, based on the unit used in the Porsche 962 and Porsche 911 GT1 race cars.
A number of variations, designed for road and track duty, have been introduced since its launch in 1999. The previous generation includes three road and several racing models which are listed below. Since the start of the production in 1999 a total of 14,145 911 GT3 cars has been produced. The new GT3 based on the was introduced in Geneva Motor Show 2013.
The GT3 has had a successful racing career in the one-make national Porsche Carrera Cup series, and the international Porsche Supercup. It has won championship and endurance races, including the GT class of the American Le Mans Series seven times, first overall in the 24 Hours of Daytona, and first overall at the 24 Hours Nürburgring six times.
The engine of the GT3 sets it apart from most of the other 996 models although it shares the same basic 3.6 litre displacement of the standard 996 type so-called "integrated dry-sump" flat-six engine. Along with those of the GT2 and Turbo, it is based on the original air-cooled 911's versatile, true dry-sump crankcase, with an external oil tank. The original version of the GT3 had 360 PS, compared to the 300 PS of the regular 996.
In GT3 configuration, this so-called "split" crankcase uses, instead of a fan and finned cylinders, separate water jackets added onto each side of the crankcase to cool banks of three cylinders with water pumped though a radiator. Thus, the GT3 engine is very similar to the completely water-cooled 962 racing car's engine, which is based on the same crankcase. The 962 differs, however, by using six individual cylinder heads while the GT1/GT3, like the air and water-cooled Porsche 959, uses two cylinder heads, each covering a bank of three cylinders. The GT3 engine could thus also be thought of as similar to a 959 engine, but with the water-cooled cylinders.
Up to early model year 2004 GT3 production, the basic casting used for the crankcase of the GT3 was the same as the air-cooled engine. The "964" casting number was visible on the bottom of the crankcase, and on areas normally machined in air-cooled applications, but not in water-cooled ones. The crankcase casting was changed in mid-2004 to a "996" casting number crankcase to eliminate these external air-cooled remnants, but internally it was the same.
Because the 911 air-cooled crankcase uses the Porsche 356 engine to transmission mounting flange configuration, the GT3 uses a manual gearbox also of air-cooled 911 heritage. This gearbox has interchangeable gear ratios and is more durable making it more suitable for racing than the standard 911 type 996 gearbox.
At 500 hp, the 4.0 litre flat-six engine in the 997 GT3 RS 4.0 is the most powerful six-cylinder naturally aspirated engine in any production car with a 125 hp per liter output.
It is a Porsche Carrera Cups race car based on 911 GT3 RS. It includes 44 mm wider rear body, 15 mm lower front spoiler lip, 1.70 m rear wing, LED taillights, racing exhaust system with a fully controlled catalytic converter, a modified special exhaust system offering more dynamic and muscular sound, Porsche Ceramic Composite Brakes. 9.5Jx18 front alloy wheels with 24/64-18 Michelin racing tyres and 12Jx18 alloy wheels with 27/68-18 tyres, additional Unibal joints on the track control arms and front and rear sword-shaped anti-roll bars with seven position settings each, additional vent in the upper part of the front lid, steering wheel mounted Info Display with 6 switches, Carrara White body. The vehicle was unveiled in 2009 Frankfurt Motor Show.
Production model began delivery in 2009–10. European model has base MSRP of €149,850.
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