Formula racing
In 1991 new rules were established and the races were disputed in double rounds on the weekends, with two drivers per car, but the series continued to lose ground with the public, sponsors and television networks to other championships with many manufacturers involved, such as Campeonato Brasileiro de Marcas e Pilotos that included the involvement of Chevrolet, Fiat, Ford and Volkswagen, as well as the always popular Formula racing championships.