Audi has revealed the revised R15 TDI that it will use to try and reclaim the Le Mans 24 Hours title this summer.

Changes to the regulations for this year have forced Audi to modify the front of the car, with the 'R15 plus' featuring a new split nose for the year ahead.

The car also features new bodywork for improved efficiency and a modified cooling and fuel tank system, while tweaks have been made to the diesel engine due to a reduction in the size of air restrictors and reduced supercharging pressure.

"This year, the Le Mans regulations prescribe air restrictors with a smaller diameter and reduced supercharging pressure for diesel-powered vehicles," Dr. Martin M?hlmeier, Head of Technology at Audi Sport, said. "Due to the reduction of engine power as a result of the regulations we have tried to make the car's aerodynamics even more efficient than before and to improve the Cd value and downforce parameters.

"After Le Mans 2009, our specifications for the R15 plus listed about 20 key items. Efficiency and reliability were at the top of the list but we also looked at details like improved night time lighting of the track. We were able to meet this wish of the drivers with a new headlight concept."

The car has already had a roll-out in Germany and is now in America for two weeks of running before the testing programme returns to European soil.

Entries are planned into the LMS events at Paul Ricard and Spa prior to Le Mans itself.