Adrian Sutil continued with his pre-season testing of the new VJM04 and put more than 300km with a best time of 1:21.780, the sixth quickest on the second day here at the Jerez de la Frontera circuit in southern Spain.
With a good foundation set-up established yesterday, Sutil evaluated the different tyre compounds available before moving onto more performance work.
The car ran reliably throughout the day, allowing the team to push on with its programme for the week.
"Today was really the start of testing for us as yesterday was principally a shakedown to make sure the systems all worked correctly. It went well, with a lot of laps completed. The car has a good balance and I think for the first real day of running we did a reasonable lap time," said Sutil.
He, however, added that there was a reoccurrence of yesterday's problems with the floor and it could only be corrected by sending it back to the factory.
"We had a reoccurrence of yesterday's problems with the floor and we know what the issue is, but to get a permanent fix we'll have to go back to the factory. I'm already looking forward to seeing how it goes in Barcelona with the KERS and the moveable rear wing, which should both give some extra performance."
Sutil will now hand over to Paul di Resta for his first-ever laps in the VJM04 tomorrow.
"Paul will get his first opportunity to drive the car tomorrow and will pickup the programme where we left off this afternoon," said Dominic Harlow, circuit engineering director.