Jolyon Palmer has admitted that his Renault engine is not as powerful as Mercedes and they will start the season on the back foot.

The rookie has replaced Romain Grosjean for the new season, but the team, who have taken over from Lotus, appear undercooked in pre-season testing.

Palmer accepts Mercedes will be out front on their own, but has praised the Renault technical team for making improvements.

"There's a difference," said Palmer. "It's not as powerful as the Mercedes engine, you can feel that.

"There are obvious benefits in that the driveability is good. The Renault engine guys have been working really well. We've been working with them over the winter.

"They've a good handle on procedures, and as I say the driveability of the engine, but at the moment they are definitely behind Mercedes on power."

Renault also supplies engines to former champions Red Bull.

The new season starts in Australia next month.


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