Brazil Friday quotes: Force India

Tonio Liuzzi - 16th: "Overall it went pretty well today over the two sessions. We still need to understand a bit more about the set-up as this is a difficult track to get right with the long straights and then the twisty middle section - you need to get the right compromise between the downforce levels. We also had an issue with the switchable rear wing in the morning but we sorted it for the afternoon. We could go some way into understanding the tyre performance but we've got a bit of work to do on the balance to get everything right, although on the positive side we know there's still more to come from us."

Dominic Harlow, chief race engineer: "A trouble free day for both cars, well executed programmes and good quality data. We've a few decisions to take overnight with respect to set up and some of the aero changes we evaluated today. The rest of the weekend will be tactically an interesting challenge for us with compromises for qualifying and the race to be weighed up."