Spain Friday quotes: Force India

Tonio Liuzzi - 12th: Overall today was good. In the morning we had a bit of a problem as I got a flat spot on my front right tyre on my first run. As we only use one set of tyres in this session, it affected the second run as it changed the balance of the car and we couldn't really set a representative time or test too many things. In the afternoon though we did some good work on each of the runs with a few different settings with different fuel levels, so the way we need to go is quite clear. We are suffering a little with understeer so we have some changes to make for tomorrow but in general it's not too bad. I think we will perform well in qualifying tomorrow.

Paul di Resta - 13th: Having had the experience of the first three races and having got more familiar with Adrian's car, I think I started where I left off in China. I feel this time it didn't take too long to get up to speed and we got some productive running, particularly in the early part of the session, which is when the track was slightly quicker. I got a better impression of the circuit and we ran through the schedule as planned, which included some baseline work and tyre comparisons: it was a good morning session.

Dominic Harlow, chief race engineer: This weekend will be about qualifying position and the way the weather turns out to be on Sunday. Today's programmes with Paul, Tonio and Adrian were trouble-free, and apart from relatively low grip levels we have had no significant problems. We tested some developments for future events together with the updates we have brought here, and once we've completed our usual analysis will carry this forward to tomorrow.