The 2005 Tranzam Sports Sedan Series was a national motor racing series sanctioned by the Confederation of Australian Motor Sport and open to drivers of: * Sports Sedans complying with CAMS Group 3D regulations * Transam cars complying with National Australian Sports Sedan Association regulations * TraNZam cars complying with TRG of New Zealand regulations * Australian Tranzam cars complying with National Australian Sports Sedan Association regulations The series was contested over a five round series. * Round 1, Phillip Island, Victoria, 22 May * Round 2, Queensland Raceway, Queensland, 3 July * Round 3, Eastern Creek Raceway, New South Wales, 24 July * Round 4, Oran Park Raceway, Sydney, New South Wales, 18 September * Round 5, Wakefield Park, New South Wales, 13 November (en)