It seems that Audi and Peugeot's winning ways have not gone unnoticed by the powers-that-be in the assorted racing series in which they compete. Whenever a design does well in racing, you can count on a few things happening, usually either other teams begin using that particular technology, rule modifications are made to minimize its advantage or it gets banned entirely. This seems to be exactly what is taking place with the turbo diesel engines now being used in the Le Mans racing series. The Automobile Club de l'Quest, the sanctioning body of the series, will mandate smaller air-restrictor size and reduced turbo pressure for the hugely powerful oil-burners.
Other changes will be made across all teams and cars, regardless of fuel type, including smaller rear wings, one tire gun in the pits and no tire heaters. These latter modifications are supposed to make the cars a bit slower and make them cheaper to operate. Perhaps Peugeot had an idea that changes might be made when it developed its new hybrid racer. As technology marches on, so must the rules ... and the teams' attempts to stay one step ahead.