 Sage stayed with Renault until the end of 1987, when it stopped supplying its turbo engines to other teams.After Renault, Sage went to manage the running of Ferrari F40's in the IMSA GT series through 1989 and 1990 with even Jean Alesi racing for the team.Into his later life he remained an active Ferrari collector and competitor in classic racing events, before his death on October 8, 2009.