Giedo van der Garde says Sauber has discovered some set-up directions which should provide the team with a step forward in the Chinese Grand Prix.

Having driven in FP1 in Bahrain last week, van der Garde was back in the car for Sauber again on Wednesday for the second day of the in-season test. After being hampered by a power unit problem in the morning, the team worked on set-up areas in the afternoon and van der Garde said there was some clear progress made.

"We were focusing quite a lot on the long runs towards the end and the good thing is that we found something," van der Garde told Crash.net in Bahrain. "It is very, very positive, so hopefully we can use it in China and make a big, big step again."

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Van der Garde also said the new set-up may be the main area of progress for Sauber in China as new aerodynamic parts have yet to be delivered.

"Towards the end we did a long run and we tried some set-ups. Aero development didn't come yet so hopefully in China we can have a step but if not then for sure in Barcelona. We're pushing hard at the factory, making the car lighter, so were fully on it. Mechanically we tried a few steps and I think we found something very interesting, so hopefully we can use this with this car in China and we will see what the two race drivers find of it. Hopefully we are working in the right direction."

Asked where the biggest gains would be found, van der Garde said: "It'll be a race distance.

"Even if you put this set-up on over one lap in the end I think we can still gain quite a lot of lap time. It was much more consistent, the reliability was better, there was not so much oversteer, the tyre degradation was much better, so I think it was quite a big step."