"We had another good day with the R27 as we started looking at some set-up changes, and understanding the handling," said Fisichella. "We made improvements through the day, and the progress confirmed the potential I could feel in the package during our reliability work yesterday.
"I think we have had a very encouraging week so far, although there are still some problems to fix, like with any new car. But that is what winter testing is all about: every problem we find here, is one that we don't have to worry about in Melbourne in two months' time."
On Friday the team's will continue testing in Jerez. Takuma Sato will replace Anthony Davidson.
Pos Driver Team Time Laps
1. Davidson Super Aguri-Honda (B) 1:19.628 145
2. Fisichella Renault (B) 1:19.766 61
3. Rosberg Williams-Toyota (B) 1:20.059 75
4. Kovalainen Renault (B) 1:21.029 52