BMW duo hindered by track conditions

Both men are tipped as dark horses for a shock result, following BMW Sauber's strong form at last year's Italian Grand Prix.

But the pair were left complaining about a lack of grip after Friday's first practice sessions, although they remain upbeat having spent the day focusing on race set-up.

Kubica said: "We were testing here last week, so we know a bit about the car's balance and other things, and that was why we didn't run a lot in first practice.

"However, it looks like the condition of the track is pretty different, and the braking stability, especially, is worse than it was in testing.

"In the second free practice we did many long runs, comparing the tyres, and these were looking quite good. I think we have quite a lot of data to look at and analyse."

Heidfeld added: "I think in general our configuration is good. Both sessions were trouble free. However, my lap times on the long runs are less consistent than I would like.

"The balance of the car changes, with it being better during the test, so we now have to analyse the data. But I still hope we can come close to Ferrari."