Force India drivers Paul di Resta and Adrian Sutil say that the VJM06 proved tricky to drive during practice for the Japanese Grand Prix.
Di Resta was fourteenth fastest during a second practice session that included a spin under braking at the Casio triangle.
“The car was quite difficult to drive today, but we’ve worked hard to try and optimise the balance,” said di Resta.
“After each run, we changed some things and I think we’ve learned a lot as a result. The long run consistency seems reasonable, but we need to make sure that we can deliver the performance with both the medium and the hard compound.”
Sutil set the fifteenth quickest time, a tenth of a second shy of di Resta’s time.
“I always enjoy this circuit, but today the car was not so easy to drive,” he said.
“I was suffering with understeer this morning and oversteer in the afternoon, and it’s hard to find the balance I feel comfortable with. We need to try and solve those issues tonight to give me confidence going into qualifying.”