Renault Sport F1's chief technical officer Rob White says the engine manufacturer is "paying the price for a late change of tack" this season.
Red Bull and Toro Rosso have both suffered numerous reliability issues in 2015, with Daniel Ricciardo set to use the fourth of his four permitted power units at the Spanish Grand Prix. However, with engine suppliers allowed to develop their power units in-season using a token system, White says Renault made a last-minute change to its specification which has been the root cause of its problems.
"It’s true to say that we are paying the price for a late change of tack, a late arrival of the spec for the start of the season, taking account of some of the things in the environment that moved on – we all know the story about tokens that moved on just before Christmas," White said. "That’s part of it, not the whole story.
"We must keep our head down and deliver the solutions to the issues that were encountered earlier on but honestly a lot of the direct consequence is to do with the lateness of the arrival of the spec. We’re still on track delivering the solutions to the earlier problems. We’ll continue those."
While reliability remains a problem, White believes a number of the crucial performance issues have been addressed already.
"Obviously in Australia the big word was driveability and I think we’ve eliminated that from our vocabulary and now we’re hoping to be in a proper situation for Monaco, where of course it’s very important.
"We’ve got performance improvements in the pipeline for delivery later in the season, again taking into account the token situation. And the game now is to fold into the plan the consequences of the failures, which clearly puts the whole supply chain under a lot of pressure. So that’s the way the land lies going forward."
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