A typically taciturn Kimi Raikkonen had remarkably few positive things to say about his performance during free practice for the Chinese Grand Prix, despite going quickest during FP2.

Heading up a somewhat unexpected Ferrari 1-2 ahead of Sebastian Vettel at the end of second practice, Raikkonen stopped the clock at 1min 36.896secs as the SF16-T gave a glimpse of its anticipated pace around the favourable Shanghai International Circuit.

However, this came despite Raikkonen complaining repeatedly over the team radio of car balace, a view he maintained even after he turned in the quickest lap of the day.

"It's been quite a tricky day," he said. "I don't know if it's the conditions or the wind or something but I was sliding a lot and obviously not feeling very nice. Once we put the supersoft tyres on we have more grip from the tyres and that helps.

"For whatever reason we've been quite struggling apart from the supersoft tyre. Our car is nice but it's just the other tyres are very difficult to get any grip from. But I had a pretty OK lap and the long run on the supersoft was OK."

Indeed, though the result raises hope over a pole position challenge for the Scuderia, Raikkonen was keeping expectations in perspective particularly as rain is forecast for qualifying.

"It's Friday so you never know what the others are doing. I think overall it was a tricky day with the conditions but at least the feeling was pretty OK in the end and we will see what the weekend brings."