Hart continued as Toleman's engine partner until the team's purchase by Benetton and later supplied engines to RAM, Haas Lola and Tyrrell in the 1980s, as well as Jordan and Arrows in the 1990s.
Hart continuou como compañeiro de motor de Toleman ata a compra do equipo por parte de Benetton e máis tarde forneceu motores aos equipos RAM, Haas Lola e Tyrrell na década de 1980, Jordan e Arrows na década de 1990.