Renault F1 chief Cyril Abiteboul has admitted there is something wrong with correlation of data between the Viry-Chattilon factory and the race track.
The French marque is struggling to get to the bottom of a fundamental problem in the area of its piston design that has led to multiple failures in 2015.
"On the dyno the engines are reliable," Abiteboul said, "but when we come on track they are not. Obviously there is something wrong in our validation process, from dyno to track."
"It's just like aerodynamics, when the wind tunnel is not telling the truth; it's exactly the same in the engine world," he told F1's official website.
But the Frenchman said Renault is working hard to solve its problems, and keen to race away from earlier suggestions it might split with Red Bull or even quit F1 altogether.
"We are living through a tough moment," said Abiteboul. But "this marriage has all the reason in the world to last. So we have to do a better job on-track, but we also have to a better job off-track."
Renault have once again irked Red Bull as a result of a well below par Spanish Grand Prix weekend, in which the former world champions were inundated with problems during qualifying which saw them on the back foot all weekend.
To add insult to injury, were lapped in the race where Daniel Ricciardo and Daniil Kvyat finished seventh and tenth respectively.
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