Kammala jumla mai zuwa: A matsayin dan wasa daya, Coulthard ya lashe lambar azurfa a 1977 Golden Spin na Zagreb da kuma taken kasa na Australia a lokacin kakar 1979 <unk> 1980. Ta gama 28th a gasar zakarun duniya ta 1979 a Vienna, Austria, kuma ta 24th a
1980 Gasar cin Kofin Duniya a Dortmund, Jamus ta Yamma. Ostiraliya ta zaɓi kada ta aike ta zuwa wasannin Olympics na 1980, wanda ya kai ta ga yanke shawarar canzawa zuwa horarwa.