The 2009 set of regulations defined by the Automobile Club de l'Ouest has already come out; it contains the technical regulations for all entrants in the LM P1 and LM P2 prototype categories and LM GT1 and LM GT2 grand touring car categories. This year it is accompanied by the initial measures adopted for the 2011 season regulations.
All races run under the Le Mans label in 2009 (Le Mans 24 Hours, American Le Mans Series in the USA and the Le Mans Series in Europe) will be governed by a single set of ACO regulations. This is why it is so important to publish them well before the first events of the 2009 season so that the entrants can prepare their cars according to the technical specification.
These regulations include the guidelines announced by the ACO at the Silverstone press conference on 13th September: level playing field, safety, cost reductions and sustainable development.
It consists of 5 documents: LM P1 and LM P2 technical regulations, LM GT1 technical regulations, LM GT2 technical regulations, supplementary technical regulations and sporting regulations.
The main outlines of the 2011 regulations
The technical definitions for the 2011 Le Mans 24 Hours concern 4 precise points:
- LM P1 and LM P2 engines: reduction of power, and cubic capacity reduction in LM P1 (diesel, 3.7-litre twin turbo 8 cylinders maximum instead of 5.5 litres, petrol, normally aspirated 3.4-litre 8 cylinders maximum instead of 6 litres, petrol, 2.0-litre turbo 6 cylinders instead of 4.0 litres), in LM P2 (diesel, 4.0-litre turbo 8 cylinders, petrol, 4.0 litres prepared on the basis of 2010 GT2, petrol, 4.5-litre series production). The minimum weight in LM P1 remains at 900 kgs and is increased from 825 to 900 kgs in LM P2.
- Hybrid systems aimed at reducing fuel consumption (free development in compliance with precise rules).
- Fuel tank capacities (75 litres instead of 90 litres for petrol engines, and 68 litres instead of 81 litres for diesels).
- Wheel dimensions unchanged in relation to the 2009 regulations).