Toyota Racing has pulled the wraps off its 2015 World Endurance Championship challenger, the TS040 Hybrid, as it aims to defend its two world titles.

2014 marked a fantastic season for the Japanese company as it claimed the drivers' title with Anthony Davidson and Sebastien Buemi along with the manufacturers' crown, winning five of the eight WEC events in the process.

Toyota has unveiled an updated version of its successful 2014 car with a redesigned aerodynamics and suspension package as well as a revised front end. The team say they have also made significant weight savings which will help the car go easier on its tyres.

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"We have put huge effort into upgrading the whole car, including the powertrain, where we have made improvements in most areas," Hisatake Murata, general manager of Toyota's motor sports division, said.

The TS040 Hybrid has also been given an improved powertrain which the team is confident will produce a maximum power output of over 1,000PS, and the car will continue to compete in the 6MJ Hybrid category

"The performance of the powertrain has been considerably enhanced. Our development means we will achieve the maximum hybrid energy more consistently than last season," Murata added. "Therefore we fully expect to see a performance improvement from the hybrid system, especially over race distances, and at every circuit."

The team will test two aerodynamic packages - designed with different levels of downforce to suit different tracks - at the WEC's Prologue at the Paul Ricard circuit on the 27-28 March.

Toyota Racing's technical director Pascal Vasselon says as the regulations have stayed largely similar for the new season, the team saw no completely review the car and opted to make small improvement on certain areas.

"The updated car is no revolution but it's an evolution almost everywhere," Vasselon said. "It looks like it is from the same family, nevertheless we have redesigned roughly 80% of the parts.

"This season we will have high and low downforce packages, for the usual reason that Le Mans has very different requirements compared to most other tracks.

"The current regulations favour more subtle changes between these packages to keep the drag reasonably low, such as modifications to the rear wing, engine cover and front end."