Davidson says car 'undriveable'

"It's been a difficult day," admitted the Super Aguri driver. "We seem to have two extremes in the car and we can't find the balance at all.

"It was a very 'undriveable' car. It's a tough situation and it's going to take a lot of work tonight to improve the car for tomorrow.

"Hopefully in qualifying set-up the car will be a lot easier to drive, but so far it's been a 'testing' day for everyone," added Davidson, 21st quickest.

Teammate Takuma Sato also had a difficult day, enduring similar problems with his car's handling.

The Japanese driver finished in 19th position.

"We struggled to find a good balance today," he said. "It's so different from our last visit here at the test over a month ago. We didn't maximise or make the most of the tyres for the short or long runs, so I think we need to work quite hard overnight.

"We collected very valuable data, but we couldn't do as many laps as we wanted as our running was quite restricted. I hope that we can improve our performance for us to be able to have a better day tomorrow."