Carlos Sainz admits that Honda power upgrade at the Japanese Grand Prix two weeks ago is a worry for Renault. Honda introduced its new engine at its home event, with progress evident after both Honda-powered Toro Rosso’s made it into the top ten in qualifying.

The Red Bull junior squad failed to hold onto the points positions however, with Sainz coming across the line to bag a point for Renault. Despite getting the better of the Toro Rossos during the race, the Spaniard says Renault should be worried about Honda’s recent progress.

“We have taken the biggest hit from the engine side,” said Sainz.

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