Derrick Walker's team originally planned to run Will Power and Simon Pagenaud under the Team Australia banner in Champ Car this year. Team boss Derrick Walker was also one of the most vocal supporters of the merger with the IRL.
Walker couldn't raise the required budgets to get the Indy Car programme off the ground and officially withdrew at the weekend, leaving both drivers currently without a seat this season.
The team would have received free IRL chassis and engines, and $1.2 million per car, from IRL boss Tony George if they could have contested the full season. However, Walker told SpeedTV.com that it would take another $3.5 to 4 million per car to run the entire season.
Derrick Walker still plans to field cars in Champ Car Atlantic this season, although the future of that series is also uncertain, and he hopes to be able to join the IRL next season.
Antoine L'Estage and his codriver Alan Ockwell of the Yokohama Canada Rally Team won the 2014 edition of the Rallye Defi by winning every stage of the rally.