Touring cars had often been a support category for Australian Grands Prix prior to 1985, but it was not until 1985 that the Australian Grand Prix joined the Formula One World Championship. In the 1980s, as well as racing in the ATCC, many teams and drivers entered in a range of non-championship exhibition races, as well as in other championships such as the Australian Manufacturers' Championship, which had all adopted the FIA's international Group A regulations for the 1985 season.