 The decision to use the A23 as the base chassis for the team's debut car was in part because the team was disallowed from using BAR's 2005 F1 car (BAR being Honda's predecessor team).From the A23, the car used a new monocoque, new aerodynamic package and rear end engine parts.The SA05 was driven by Takuma Sato, whose firing by the works Honda team had played a significant role in creating the team, and also was driven by inexperienced Japanese rookie Yuji Ide and long-term Renault test driver Franck Montagny.