On March 19, at Sebring, Audi R15 TDI will have its last appearance in a form that had to be modified to comply with the new directives.
The drivers of the two sportscars will be Timo Bernhard/Romain Dumas/Mike Rockenfeller (D/F/D), last year's Le Mans winners, and also Dindo Capello/Allan McNish/Tom Kristensen (I/GB/DK), Le-Mans winners from 2008.
The new LMP1 prototype regulations for new models like Audi R18, which will race for the first time in May, limit engine displacement to 3.7 liters. As an end result, the V10-powered R15 TDI will be obliged to draw air through two intake-air restrictors of 33.5 millimeter (1.31 inches) diameter - 4 millimeters (0.16) less than before.
Also the boost pressure has been restricted by 23% to 2,000 millibar (before 2,590 millibar was allowed). In the same time, the tank can only hold 65 liters and the fuel flow restrictor had been reduced by five to 28 millimeters, 1.1 inches.
Technical Director of Audi Sport Team, Ralf Juttner explains how drivers felt the engine restrictions and the several dozen horsepower in minus.
Two years ago, the R15 made its first appearance at Sebring and celebrated its premiere with a victory, the ninth of Audi at this event in the United States, Florida since 2000.
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