Red Bull's Christian Horner says Renault engine performance is 'unacceptable'

Red Bull boss Christian Horner says the performance of the team's new Renault engine "isn't acceptable" after the season-opening Australian Grand Prix at Melbourne's Albert Park.

Red Bull lost a car before the start, with Daniil Kvyat stopping on his installation lap with gearbox trouble and failing to make it around to the pits.

Meanwhile Daniel Ricciardo ended the race in sixth, and admits it will be "hard" to improve on the car before the next race in Malaysia.

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Formula 1