Giancarlo Fisichella was 'encouraged' by the initial results from the VJM01, having finished sixth on the timesheets at Barcelona on Tuesday.
It was Fisi's first run in Force India's 2008 challenger and produced some encouraging results.
The Roman clocked the sixth fastest time, finishing 1.5secs off Lewis Hamilton's P1 time.
"It was a good day. We did over 100 laps and worked through all the schedule," the former Renault driver said.
"I was struggling with the front locking at first, but then we understood what the problem was and made a change so the car was back to normal and at the end I was comfortable and confident and able to improve my lap times.
"I am happy with the new package, it is better with more downforce and has more stability, but we have still got something more for the first race so it looks quite encouraging."
Chief technical officer Mike Gascoyne added: "Again a very productive day of testing.
"We had no major reliability issues and despite the numerous red flags, we were able to work through the whole programme, with both drivers doing set up work in the morning and then race distances in the afternoon with pit stop practice.
"That went very well on both cars, so it was overall a good day."
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