The 997 GT3 Cup series of racing cars succeeded the 996 GT3 Cup and continued Porsche's long-running strategy of producing purpose-built, customer-ready racing machinery closely derived from production road cars. The Cup cars are designed for amateur and semi-professional racers competing in the controlled environment of one-make championships, where identical machinery places the emphasis squarely on driver skill.
The first-generation 997 GT3 Cup debuted for the 2005 racing season. Its 3.6-litre flat-six engine is rated at 294 kW (400 PS; 394 hp) at 7,000 rpm and 400 N·m (295 lb·ft) at 6,500 rpm, mated to a six-speed sequential transmission. The shift to a sequential gearbox over the manual unit of some prior versions allowed for faster gear changes more suited to competitive racing.
The car featured significantly improved aerodynamics compared to its predecessor and incorporated lightweight carbon-fibre reinforced polymer components including doors, rear body panels, the engine deck lid, and the rear wing. Suspension components were adopted from the GT3 RSR race car, giving the Cup car sharper handling characteristics. Brake discs measured 380 mm at the front and 350 mm at the rear, with ABS fitted as standard across four control settings.
Unveiled at the 2009 Frankfurt Motor Show, the updated 997 GT3 Cup 3.8 was based on the 997.2 GT3 RS road car and introduced a larger 3.8-litre engine producing 331 kW (450 PS; 444 hp) at 7,500 rpm, with an 8,500 rpm redline. The rear bodywork was 44 mm (1.7 in) wider, the front spoiler lip was lowered by 15 mm (0.59 in), and the rear wing — adopted from the 911 GT3 Cup S — measured 1.70 m in width. New LED tail lights and a modified racing exhaust system were fitted.
Wheel sizes were 9.5Jx18 at the front wearing 24/64-18 Michelin racing tyres and 12Jx18 at the rear with 27/68-18 tyres. Unibal joints on the track control arms and sword-shaped anti-roll bars with seven position settings at each end provided enhanced chassis tunability. The steering wheel featured a mounted Info Display with six switches. Kerb weight stood at 1,160 kg (2,557 lb). The European base price was €149,850 before tax when deliveries commenced.
The 997 GT3 Cup formed the backbone of the Porsche Supercup, the international one-make series that supports the FIA Formula One World Championship, as well as numerous national Porsche Carrera Cup championships across Europe, Asia-Pacific, and the Americas. The controlled specification of the Cup car made it a popular entry-level endurance and sprint racing machine for gentleman drivers and up-and-coming professionals alike.
The parallel 997 GT3 Cup S, homologated on the basis of the GT3 RS road car rather than the standard GT3, was targeted at international FIA GT3 customer racing and featured suspension components adopted from the GT3 RSR. This gave teams a bridge between the pure one-make Cup series and full open-class GT3 competition.
The 997 GT3 Cup cemented Porsche's dominance of the one-make racing market and its success led directly to the development of the 991 GT3 Cup, which debuted for the 2013 season. The 997 generation race car's combination of accessible performance and close-fought racing proved that the Cup formula remained as relevant as ever heading into the next decade.