There are at least eleven variants of the 917. The original version had a removable long tail/medium tail with active rear wing flaps, but had considerable handling problems at high speed because of significant rear lift.
The Porsche 917 is a race car that gave Porsche its first overall wins at the 24 Hours of Le Mans in 1970 and 1971. Powered by the Type 912 flat-12 engine of 4.5, 4.9, or 5 litres, the 917/30 Can Am variant was capable of a 0-62 mph (100 km/h) time of 2.3 seconds, 0–124 mph (200 km/h) in 5.3 seconds, and a top speed of up to 240 mph (390 km/h).
The handling problems were investigated at a joint test at the Österreichring by the factory engineers and their new race team partners John Wyer Engineering and after exhaustive experimentation by both groups, a shorter, more upswept tail was found to give the car more aerodynamic stability at speed.
Porsche 917K in the distinctive Gulf Oil livery.
Porsche p-917 19
The 917K, and the special Le Mans long-tail version (called the 917 Langheck, or 917L), dominated the 1970 and 1971 World Sportscar Championships.
The 908 originally was a closed coupe to provide low drag at fast tracks, but from 1969 on was mainly raced as the 908/2, a lighter open spyder
A more compact 908/3 was introduced in 1970 to complement the heavy Porsche 917 on twisty tracks that favored nimble cars.
The 1968 24 Hours of Le Mans were postponed from June to the end of September due to political unrest in France, setting the stage for a showdown between the 908s and the GT40s.
The Porsche 908 LH Long Tails were the fastest in qualifying and the early stages of the race, but it showed that Porsche had not taken advantage of the additional time to improve the 908. Troubles with the alternator caused delays and even disqualifications as the new Porsche team leaders had misinterpreted the repair rules. Once again, a V8-powered Ford won, and a 907 Long Tail came in second in front of the sole surviving standard 908.
For 1969, the Group 6 prototype rules were changed, and Porsche lowered the weight of the Porsche 908/02 Spyder by 100 kg (220 lb),
removing the roof and the long tails. Aluminium tube frames were used, with air pressure gauges to check them.
Compared to the outgoing 997, the 991 is slightly larger, with the wheelbase increased by 100 mm (3.9 in) to 2,450 millimetres (96.5 in), and the overall length up by 70 mm (2.8 in) to 4,490 millimetres (176.8 in).
A new transaxle was developed so that the rear wheels could be moved 76 millimetres (3 in) backward in relation to the position of the engine, which significantly improves the weight distribution and cornering performance of the new 911.
Porsche introduced the first production turbocharged 911 in 1975.
Although called the 930 Turbo (930 being its internal type number) , the body shape incorporated wide wheel-arches to accommodate the wide tires, and a large rear spoiler often known as a whale tail on the early cars (modified from the original 1974 IROC design). They were initially fitted with a 3.0-litre engine 260 PS (190 kW; 260 hp) and four-speed gearbox.
Ferdinand Porsche founded the company called "Dr. Ing. h. c. F. Porsche GmbH" in 1931, with main offices at Kronenstraße 24 in the centre of Stuttgart.
The 356 was built in four distinct series, the original ("pre-A"), followed by the 356A, 356B, and then finally the 356C.
The Porsche 911 (pronounced Nine Eleven or German: Neunelf) is a two-door, 2+2 high performance sports car made since 1963.
Model year 1974 (G Series. Aug. 1973 to July 1974 production) saw significant changes: the engine size was increased to 2687 cc achieving higher torque.
the use of K-Jetronic CIS Bosch fuel injection in two of the three models in the line up— the 911 and 911S models, retaining the narrow rear arches of the old 2.4, now had a 2.7-litre engine producing 150 PS (110 kW; 150 hp) and 175 PS (129 kW; 173 hp), respectively.