Porsche 935
From 1976 onwards, the long-distance races for the World Constructors' Championships were raced with so-called production racing sports cars, according to the new Group 5 ruling. This was the signal for Porsche to develop the 911 Turbo (internal designation 930) and create the 935. The experience accumulated with the 911 RSR Turbo could be used to the full in 1974. Compared with the turbo RSR with its spectacular rear airfoil, the shape and size of the rear airfoil on the 935 were limited. They were also not permitted to project from the contours of the car, viewed from the front. The 935 was fitted with an adjustable, horizontal airfoil pivoted between two vertical fins. The design of the spoiler, which had to be modified again later on account of an FIA resolution, was well-suited to accommodate the charge-air intercooling in addition to the air intake and induction air opening.
As no restrictions were placed on the configuration of the front fender, the upper edge was simply cut off, the headlights were also removed and the surfaces were provided instead with a series of narrow slots, by means of which a higher output shaft to the front axle was achieved. The 600 bhp 935 from Porsche was entered in the long-distance races for the World Constructors' Championships in 1976. The premiere was a success: In Mugello as at the next race in Vallelunga, Ickx/Mass drove straight to overall victory and thus, after a five-year break, they were able to bring back a World Constructors' Championship title for Porsche. The 935 numbers among the most successful vehicles in the era of racing sports cars approximated to the production version.