Alpine-Renault A442B 1977

Alpine had been working with increasingly close ties to Renault since 1971, and by the beginning of the A442 project in 1975 the two companies were almost completely merged. Renault finally bought Alpine outright in early 1976, Renault inheriting Alpine's sports prototype program. The A442 was a direct evolution of the successful Alpine A440 and title-winning A441 models. However, unlike the previous cars, the A442's 2.0L Renault-Gordini powerplant boasted a large Garrett turbocharger, pushing power output to 490 bhp (365 kW). Over the next three years this would increase to well over 500 bhp (370 kW), with the A443's 2.2L unit developing 520 bhp (388 kW).

In common with the earlier cars, the engine was suspended inside a relatively small steel spaceframe chassis, which was then clothed in a much longer glassfibre body. The extra length of the body was mostly to be found in the tail section, to improve high-speed aerodynamic efficiency, and hence top speed on the long Mulsanne straight at Circuit de la Sarthe. The bodywork was a conventional open two-seater arrangement. Designed as a "hare", to stretch their Porsche 936 rivals to breaking point, the A443 also incorporated a slightly longer wheelbase. Following wind tunnel testing during the autumn and winter of 1977, the A442B and A443 were introduced in 1978 each sporting an acrylic glass "bubble" partial roof, resulting in an additional 8 km/h (5 mph) in top speed at la Sarthe, but reducing visibility from the driving seat. However, during practice for the 1978 Le Mans race, A443 drivers Patrick Depailler and Jean-Pierre Jabouille complained that the bubble made them feel claustrophobic and trapped engine heat inside the cockpit, making driving conditions intolerable. Therefore, only the A442B ever competed with the bubble in place.

By 1978, Gérard Larrousse had moved up from works driver to manage the Renault Sport team. He laid out the team's priorities: win at Le Mans, then focus all attention on repeating the success in Formula One. Renault ploughed a huge budget into developing the A442 into a Le Mans winner. Many hours were spent in testing, particularly using long airport runways to simulate the mechanical and aerodynamic stresses induced on the long, fast Mulsanne Straight. In addition, Renault's engine department went to work on squeezing as much power out of the five-year-old powerplant as was possible. Capacity was upped to 2138 cc, just short of the theoretical 2142 cc limit for turbocharged cars, and this revamped engine was installed into the new, lengthened chassis, becoming the A443.

In full qualifying trim, with the bubble roof, the A443 achieved a top speed of 236 mph (380 km/h)[1] on the Mulsanne Straight, making it the fastest car ever produced by Renault, a record which still stands today and includes all of Renault's F1 entries.