The Porsche 911 GT3 is a high performance version of the Porsche 911 sports car primarily intended for racing. It is a line of high-performance models, which began with the1973 911 Carrera RS.
A number of variations, designed for road and track duty, have been introduced since its launch in 1999. More than 14,000 911 GT3 cars have been produced.
The GT3 has had a successful racing career in the one-make national Porsche Carrera Cup series, and the international Porsche Supercup.
Porsche introduced the 991 GT3 at the Geneva Motor Show in 2013. The 991 GT3 features a new 3.8 litre direct fuel injection (DFI) flat-six engine developing 475 hp (354 kW; 482 PS) at 8,250 rpm, a Porsche Doppelkupplung (PDK) double-clutch gearbox and rear-wheel steering.
The engine is based on the unit fitted in the 991 Carrera S, but shares only a few common parts. All other components, particularly the crankshaft and valve train, were specially adapted or developed for the 991 GT3.
For example, the 991 GT3's engine uses titanium connecting rods attached to forged piston, in order to allow the engine to reach up to 9,000 rpm. The dual-clutch gearbox is another feature specially developed for the 991 GT3, based on sequential manual transmissions used in racing cars.
The 991 GT3 is able to accelerate from 0-60 in 3.1 seconds or less,
The GT3 has a claimed top speed of 310 kmph (195 mph).
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