The ACO and FIA endurance commission will introduce a revised set of sporting and technical regulations in the LMP1 class which could open the door to a shake up between Porsche, Audi and Toyota.

The revisions - aimed to maintain the 'thrills of endurance racing' while producing 'a stable, cost-controlled championship' with the highest safety standards - will see energy per lap reduced by 10MJ (7.5% less) with fuel flow reduced by a similar proportion, while at Le Mans the hybrid power is only restricted by 300kw.

The capping of power, as well as reductions on in-season testing and wind tunnel restrictions, may see closer competition between the manufacturers in LMP1 after Porsche's power advantage was evident in 2015 as the German marque claimed six wins, including Le Mans 24 Hours, in eight events.

Audi, WEC title winners in 2012 and 213, look to fight back this year with a new R18 e-tron Quattro with redesigned and lightweight aerodynamics, a modified hybrid system with lithium-ion batteries and a more efficient engine.

Porsche's 2016 efforts keeps the primary concept of the world-conquering 919 Hybrid with tweaks to its hybrid system and gearbox.

Toyota, winners in 2014, also has a new challenger to roll out, the TS050, with a fresh livery and under the paintwork it has worked on a new monocoque and upgrades to its engine and hybrid system.

To reduce costs and make the LMP1 an even playing field changes to homologated bodywork pieces will be cut from three to two in 2017. New safety measures are also set to be introduced with additional head protection padding for drivers and wheel arch vents made 25% large.



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