High Quality Content by WIKIPEDIA articles! The 1986 World Sports-Prototype Championship season was the 34th FIA World Sportscar Championship season. It was a series running under the Group C formula, running cars in two classes known as C1 and C2. An invitational GTP class was also run for IMSA-spec cars. It ran from April 20, 1986 to October 5, 1986, and was composed of nine races.