Sebastian Vettel insists that Red Bull is still learning about the new RB9 going into the Chinese Grand Prix this weekend in Shanghai.

Vettel tops the championship standings on the back of his controversial victory in Malaysia last month while Red Bull also leads the constructors' title race thanks to the 1-2 finish it secured at Sepang.

The Milton Keynes-based outfit therefore heads into the third race of the year expected to challenge at the head of the field once again, although Vettel said it was difficult to know what to expect before the cars hit the track.

"We learned quite a bit from the first two races but China will be different again," he said. "It's a different circuit, different climate so I think we are still in the learning process. Obviously the first two races helped a lot and I think it was very obvious for everyone to see that working with the tyres and trying to make them work was crucial. It determines your strategy, the race and then your result.

"I think we have still got a lot to learn but I think we made some improvements. We tried to tweak the car a little bit to help that, but on the other hand we will still have to come to China, set the car up on Friday, see how long the tyres last and go from there."