Renault Sport has revealed the extent of its changes ahead of the 2015 F1 season, claiming it has undergone a 'refresh' behind-the-scenes in an effort to avoid the repeat of last year's struggles.

Having powered Red Bull Racing to four consecutive F1 titles between 2010 and 2013, Renault had difficulties getting a grasp on the new V6 power units introduced for 2014, struggling for speed and reliability against the dominant Mercedes-powered teams.

Those difficulties have prompted a significant number of changes being introduced to both the power unit and the structure of the company, with a focused effort on bridging the deficit to Mercedes for 2015.

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"We knew what we had to do over the winter and we know what we have achieved" said managing director Cyril Abiteboul. "We believe we have made a very big step in performance and will be more reliable. We do not know where the others will be: we may not have erased all the gaps, but we are confident that we have gone a long way to making up the deficit of last season.

"Our objective is to close the gap as much as possible and give Red Bull Racing and Scuderia Toro Rosso a more competitive car on most circuits, independently of their characteristics and sensitivities.

After campaigning successfully for an amendment to the engine freeze regulations, Renault Sport confirmed it has already used the majority of the upgrade 'tokens' available to it, but has saved some to use over the course of the season.

"We have used the majority of the tokens for the first race and our use of tokens during the course of the season will be relatively modest," said repositioned chief technical officer Rob White. "It then becomes a matter of strategy about when you introduce the remaining tokens; whether to introduce at the start of the season when the technology is relatively immature but could give greater relative performance, or later in the season when the part has had more testing miles but the impact on performance will be potentially less.

"We can still make changes for reliability under the sporting regulations. We have therefore prioritized token spend to make as much headway as possible with performance.

In addition, Renault Sport has undergone 'fundamental' changes to its operation, with Abiteboul claiming it must use its resources more effectively.

"F1 constantly moves forward at a very fast rate. The sport evolves, technology evolves and the competition never sleeps so Viry needs to evolve at the same rate. Viry needed a refresh. We did not suffer from a lack of resources or finances in 2014, it was simply that the resources were not joined up in time or used to their optimum.

"In the short gap between seasons we have therefore taken a number of steps forward. First and foremost we have implemented a new organizational structure. There is a numerous of changes in this new structure. I'll underline three of them to indicate where the focus will be in 2015.

Changes include a new development department headed by Naoki Tokunaga, while Remi Taffin will takes on an expanded factory role.

Furthermore, Renault Sport will only supply two teams - Red Bull Racing and Scuderia Toro Rosso - in 2015 after Lotus defected to Mercedes and Caterham's future remains unclear.