Porsche 911 GT2
With a powerful 456-horsepower (SAE) engine and carefully lightened components, the 2003 Porsche® 911 GT2 emerges as the fastest member of the Porsche production car family. In testing at the famed Nurburgring racetrack in Germany, the GT2 shattered all-time track records for street-legal production cars.
The 911 GT2 engine, a modified version of the 3.6-liter twin-turbo six-cylinder “boxer” engine from the 911 Turbo, produces 456 horsepower (SAE) at 5,700 rpm compared to 415 horsepower (SAE) at 6,000 rpm of the 911 Turbo. The power increase and approximately 220-pound total weight reduction give the 911 GT2 a power-to-weight ratio of 6.9 lb. per horsepower, resulting in even more astounding performance than the 911 Turbo.
Design changes that set the 911 GT2 apart from the 911 Turbo also add function, including larger front air intakes and an additional air intake ahead of the front hood. In the back, redesigned air intake scoops moved far to the outside reveal the greater need for cooling air. The 911 GT2 replaces the two-piece automatic-deploying spoiler of the 911 Turbo with a new, one-piece fixed-design wing. As on the 911 Turbo, Bi-Xenon headlights are standard.
Because the 911 GT2 is capable of extremely high racetrack speeds, Porsche refined the aerodynamic characteristics to produce greater downforce, even sacrificing a lower coefficient of drag (Cd) to do so. Suspension modifications lower the car by 0.78-inches front and rear, reducing both wind resistance over the car and the airflow beneath the car that can cause lift. The changes reduce under car airflow by 60 percent compared to the 911 Turbo.
Ducting hot air away from the front central radiator through a vent in the hood also reduces lift forces. The front edge design of this vent causes air flowing above the car to generate an additional suction effect, which in turn increases velocity of air flowing through the central radiator.
Source: Porsche press