 Ramba uchinyora ndima iyi - Vatyairi vakamhanyira mumotokari dzakagadzirirwa zvakafanana dzakagadzirwa neboka rimwe chete ravanamakanika mukuedza kuita nhangemutange yacho muedzo bedzi wamano omutyairi. Yakanga ichitungamirirwa neboka duku ravatyairi 12 vakakokwa. Yakasikwa uye yakagadzirwa muna 1972 naDavid Lockton, mugadziri weOntario Motor Speedway, yakatangwa muna 1973, naMark Donohue ari mutyairi wekutanga kukunda mukwikwidzi muna 1974. Motokari dzaishandiswa gore iroro dzaiva Porsche Carrera RSRs. Kukunda kwaDonohue mujaho wechina uye wekupedzisira wemwaka iwoyo kwaive kukunda kwake kwekupedzisira, sezvo akafa mutsaona yeFormula One kuÖsterreichring mukuedzwa kwe1975 Austrian Grand Prix. Nhevedzano yacho haina kumhanyiswa muna 1981, 1982, kana kuti 1983. 