Daniel Ricciardo says he remains 'optimistic' heading into the Malaysian Grand Prix despite a disappointing start to the 2015 Formula 1 season on home soil.

The Australian finished sixth and a lap down on the leaders in the Red Bull RB11, Ricciardo complaining of driveability issues from a Renault power unit that also came into substantial criticism from Christian Horner after the race.

Nonetheless, Ricciarrdo says he is focused on bringing the RB11 up to speed, beginning with the Malaysian Grand Prix in Sepang.

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"I'm feeling good coming into Malaysia, I know we have a lot of things to improve on and I'm optimistic that we can achieve some of those in Malaysia, which will give us some more performance. I'm just hanging out waiting to drive now, but it's good.

"The season has started now and I think if anyone had any first race jitters they're gone and I think Malaysia should run a lot smoother for everyone."