Williams Duo Hope for More Pace

Both endured a somewhat disappointing practice sessions on Friday, with Heidfeld finishing down in 11th place while Webber was only 15th quickest.

Heidfeld, who had finished in third place in Malaysia two weeks ago, admitted he was not happy with the handling of his car but was confident of making improvements ahead of qualifying.

"My morning session was compromised by a minor drive shaft boot problem," said Heidfeld. "However I wasn't happy with the balance of my car and we made some minor adjustments during the afternoon session, which improved it.

"The balance is still not ideal but we are going in the right direction. Also, as usual on a Friday it's important to collect some good tyre information and I think that we achieved that."

Webber echoed his teammate's thoughts, claiming Williams will need to find more speed for Saturday.

"Unlike last year on Friday, the track was quite quick today and we completed our working programme," said Webber. "Still, we have to find more pace since we are not as strong as we think we can be. We also need to pick the right tyre, which we'll do later on together with our Michelin engineers."