The performance of the Audi and Peugeot turbo-diesel prototypes will be pegged back for 2009, it was announced on Saturday.
The Automobile Club de l'Quest, which sets the rules for the 24 Hours and the series that take its name around the world, announced new engine rules for 2009 at the Silverstone Le Mans Series event.
The ACO revealed that it will cut the diameter of the engine air-restrictors for diesels by 10 percent at the same time as reducing turbo pressure.
The move is designed to restore what the ACO labeled 'sporting equity' between petrol and diesels at the same time as increasing lap times at Le Mans. It does not want LMP1 prototypes to lap under the 3:30 barrier during next year's 24 Hours, whereas this year the Peugeot 908s regularly lapped in the low 3:20s during the race.
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