A pair of new R15 TDI race cars will make their race debut at the Sebring 12-hour race next month, but the highly anticipated Le Mans Prototype has already been seen running development laps.

While Audi will contest the 24 Hours of Le Mans as part of its factory commitment with the new R15 TDI in 2009, Dr Colin Kolles is planning to buy two Audi R10 TDI cars for his racing team.

Audi has tweaked its R15 TDI racing car ready for the 2010 Le Mans 24 hours. Change was necessary as the sport’s new regulations aim to peg back the oil-burning entries that have ran away with ...