Whereas other races in the World Championship needed their fields bolstered by Group 6 cars “grandfathered” into the entry list, the Le Mans list had very strong support for the new Group C with 33 entries, coming from a wide variety of manufacturers and racing specialists. There were factory teams from Porsche, Ford, Lancia and Mazda; with racecar builders Lola, March and Rondeau bringing works cars. Finally a raft of small privateer specialists brought their own Group C designs. These amounted to 30 "works" entries, the most seen at Le Mans for many years. However, as an interim year, to complete the field the ACO accepted entries from
IMSA in the GTX and GTO categories, and had limited spaces for the former FIA classes. The team had a computer in the pits and digital flow meters in the cars to give them an edge in calculating the fuel consumption. Three cars were ready just in time, run by new team manager Peter Falk.
Jacky Ickx was back out of retirement and a full-time works driver again with
Derek Bell as his co-driver. The second car had
Jochen Mass and
Vern Schuppan while the one-off third car had Barth,
Hurley Haywood and
Al Holbert. The fortunes of Le Mans local
Jean Rondeau had taken a big upward turn, selling several vehicles to customers. This enabled development of a Group C ground-effect car, the M482, and embarking on a full WEC season. Until ready, the team adapted the existing design to Group C spec, as the M382. They had the best possible start, winning the opening round at
Monza with an updated M379C car, and came into the race as the leader in the championship. For Le Mans, three of the M382s were prepared, fitted with the bigger Cosworth DFL: the race-winning chassis would be driven by
François Migault,
Gordon Spice and Xavier Lapeyre. The premier car had
Henri Pescarolo and
Jean-Pierre Jaussaud (with five wins between them) while the third car had Rondeau himself with rally-specialist
Jean Ragnotti. There were also three customer Rondeaux; Christian Bussi had an M382 with a 3.3-litre DFL, while those of Pierre Yver and former team-driver Jacky Haran were older M379Cs with 3-litre DFV engines. Much like at WM, some of the R&D team at
Mercedes-Benz got involved in Group C racing as a sideline. Swiss engineer
Peter Sauber was working with composite-technology company Seger & Hoffmann, stepping up from their BMW M1 collaboration to Group C. They contacted the Mercedes technicians to develop their chassis design and aerodynamics. The resultant
SHS C6 was fitted with a 3.96-litre Cosworth tuned by Heini Mader who got it to 540 bhp. Two were built, and sold to Gerhard Schneider (who had bought a Sauber-tuned M1) and Swiss slot-machine magnate
Walter Brun. Both cars would be managed for the race by Schneider's GS Sport racing team. Brun drove his car with Siegfried Muller Jr, while the other had team-regular
Hans-Joachim Stuck joined by
Jean-Louis Schlesser and
Dieter Quester. With the Porsche 956 not available for customer sale until the next year, both
Joest and
Kremer were given copies of the
Porsche 936 factory plans to build their own replica versions.
Reinhold Joest fitted the new 936CJ with a 2.5-litre turbo engine, and ran it alongside the older 936/77, to give
Bob Wollek the
DRM championship. Purchased by the Belgian Martin brothers, they ran it in the WEC with Wollek, with their red and white
Belga tobacco sponsorship. After they got a third at Silverstone, Philippe Martin crashed the car heavily at Nürburgring. The rebuild gave the engineers the chance to fit a long tail and low-drag nose for the circuit.
March Engineering was already making an impact in the American single-seater
CART series. It entered Group C picking up the BMW M1C design targeted for the IMSA competition. That car was substantially reworked by
Adrian Newey to be able to accommodate any engine into its monocoque chasses. The first choice was a Chevrolet 'small-block' 5.8-litre V8, which put out 550 bhp. The first chassis was bought by
Bob Garretson as GTP-spec, and had performed well in America.
Bobby Rahal and
Jim Trueman had finished second at
Sebring and were joined by Skeeter McKitterick. Two more chassis were sold to American teams while the fourth chassis was entered by the works team for Le Mans, to be driver by
Eje Elgh,
Patrick Nève and
Jeff Wood. The 'privateer' car was sponsored by Aston Martin saviour
Victor Gauntlett's company
Pace Petroleum. Inspired by the achievements of Jean Rondeau, fellow Le Mans resident Yves Courage decided to build his own Group C car. The Cougar C01 had an aluminium monocoque from the same company supplying Rondeau. The chassis was designed by former
Ligier and
Renault engineer Jean-Yves Charles, and it was fitted with a 3.3-litre Cosworth DFL tuned by Swiss engine-specialist Heini Mader. The previous year he had raced with
Jean-Philippe Grand, an agent for Primagaz and they teamed up again with Primagaz sponsorship along with Michel Dubois as the third driver.
Group 6 (2-litre) Although the large Group 6 cars had been superseded by Group C, the FIA allowed the 2-litre cars entry to help keep the fields up (and did not prevent new models from entering). They would not count points towards the Manufacturer's Championship, but could to the Driver's title. Ever the opportunists,
Lancia produced a new, open-top car for the Group 6 class. The
Lancia LC1 had a chassis built by
Dallara, with skirts and ground effects (both banned in Group C). It was fitted with the same 1425cc turbo-engine that was in their Group 5
Beta Montecarlo, which was now tuned to put out 440 bhp. Without the weight limitations or fuel restrictions of Group C it could still reach 300 kp/h (185 mph) and was a genuine contender, having won two of the three rounds outright. However, many in autosport saw it as a cynical exploitation of the rules. The Martini team brought back their regular Formula One drivers for the race:
Michele Alboreto and
Teo Fabi with
Rolf Stommelen and
Riccardo Patrese and
Piercarlo Ghinzani with
Hans Heyer.
Group 5 With Group 5 being phased out, the over and under 2-litre divisions were merged into a reduced class this year. It was dominated by four
Porsche 935s. Dieter Schornstein's Vegla team again worked with Reinhold Joest to run their 935J, while Kremer-kit cars were entered by German Edgar Dören and last year's class winner, Charles Ivey Engineering. The fourth car was Claude Haldi's four-year old 934/5. Against the Porsches there was limited opposition. The only BMW this year came from Hugues de Chaunac's French
ORECA team. The Scuderia Sivama di Galliate had bought a pair of
Lancia Montecarlos from the factory, to by run in the WEC by the Scuderia Vesuvio team of
Daniele Audetto. For Le Mans, they worked with the race-entries of two French privateer regulars,
Thierry Perrier and Jean-Marie Lemerle who would share the driving with the Scuderia drivers. Team manager
Tim Schenken had a Joest 2.6-litre engine to fit for race.
Mazdaspeed was still preparing its Group C project, so in the interim worked with the Mooncraft company to develop the
RX-7. The uprated RX-7 254i was more aerodynamic and its twin-rotaries could put out 320 bhp to reach 275 kp/h (170 mph) Cars were prepared for European racing by
Tom Walkinshaw Racing. Walkinshaw led one car while works driver
Yojiro Terada led the other. Despite a disappointing run the previous year,
Billy Hagan's
Stratagraph team returned with two big
Chevrolet Camaros. Both cars were given smaller engines and front and rear disc brakes. Last year's car (with a 5.7L V8) was an aerodynamic nose and high rear aerofoil. It was raced by
NASCAR veterans
Dick Brooks and
Hershel McGriff. Hagan's car had the 5.4L V8 detuned to 570 bhp and had regular racing bodywork. ==Practice and Qualifying==