[1] The cars best result was a 6th-place finish at the 1982 1000km of Monza, being driven by Roger Dorchy, Guy Fréquelin, and Jean-Daniel Raulet.
[2][3][4] It was powered by a Garrett twin-turbocharged, 2.7 L (160 cu in), Peugeot PRV, V6 engine, producing between 600–890 hp (450–660 kW) @ 8300 rpm, depending on boost pressure, which drove the rear wheels through a 5-speed manual transmission.
The chassis design was constructed into an aluminum monocoque, and the car weighed approximately 900 kg (2,000 lb).
The WM P83 was developed by Welter in 1983 so that the prototype could take part in the 24 Hours of Le Mans that same year.
The chassis was already based on the monocoque construction and the body was pulled down well over the rear wheels, a typical feature of Welter racing cars.
Gérard Welter, who worked as an aerodynamicist and vehicle designer at Peugeot, was able to draw on wind tunnel tests.
The WM P86 was one of the fast racing car prototypes that Gérard Welter developed in the 1980s with financial support from Peugeot and entered and used in the 24 Hours of Le Mans.
1986 drove Jean-Daniel Raulet, Michel Pignard, and François Migault the car with the starting number 41, which was reported in the C1 class and failed after 132 laps driven to engine failure.