Heidfeld: there is more to come

The German, who outpaced Antonio Pizzonia on Friday after gunning for a quick time at the end of the day, has earned praise from the team's technical chiefs and is confident himself that with a bit more work he can be even quicker.

"I think there is a little bit more to come from me, just from adjusting my driving style," Heidfeld told autosport.com. "The car itself is okay - it's very neutral and driveable.

"We have already improved on the car in a couple of areas and there are a few other things that I would like to look closer at the data for to decide what we should do - but the car is very good in the dry."

Heidfeld himself has certainly found his senses have not been dulled after a season racing in the midfield for Jordan - and, although the step up to the Williams has been pleasant, he still admits he wants the car to be even quicker.

"The car is so easy to drive and I did say last week that the engine is so powerful," he explained. "But when you get used to it you just want more. After a few laps, like any driver, you just want more and more power."