Arnoux furthered this in with consecutive wins in Brazil and South Africa, both on high altitude circuits where the Renaults were dominant. Jabouille continued to have problems with retirements, but in his only points finish he emerged victorious in Austria. At the end of the year Jabouille crashed heavily at the Canadian GP and suffered serious leg injuries, which effectively ended his career as a Grand Prix driver. Alain Prost was signed up for . In his three years with the team, Prost showed the form that would make him a Formula One legend and the Renaults were among the best in Formula One, twice finishing third in the Constructors' Championships and once second. Prost won nine races with the team while Arnoux added two more in . Arnoux left for rival Ferrari after 1982 and was replaced by American Eddie Cheever. In , Renault and Prost came very close to winning the drivers' title but were edged out by Nelson Piquet (Brabham-BMW) at the last race of the season in South Africa. After the end of the season, a rival fuel company said that the fuel used by the Brabham-BMWs in South Africa had exceeded the maximum Research Octane Number of 102 permitted under the Formula One regulations. BMW said that this was incorrect and FISA released a dossier supporting their stance. No action was taken.