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 a 28th a
1979 Gasar Cin Kofin Duniya a Vienna, Austria, da 24th a Gasar Cin Kofin Duniya ta 1980 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.