Williams continued to struggle for pace in Shanghai with the Grove team completing Friday's timesheets along with Marussia and Caterham.
Valtteri Bottas: "We tried lots of things in FP1 and saw some positive results. In FP2 I had a problem at the start but the team did a great job to fix it in time for me to still complete three runs. I feel we have moved a little bit forward since Malaysia, but we'll see tomorrow where we are compared to the others in qualifying set-up. We need to work hard to maximise what we have here."
Pastor Maldonado: "We will see tomorrow in qualifying what steps we have made as it's too early to say. The car felt like we had made some improvements during FP1, but we struggled this afternoon so we need to analyse the data to see how best to move forward."
Jules Bianchi: "It has been a good day today and it is very pleasing to see clear progress since the first two races, not just in terms of the results, but the way we have revised our working methods to ensure we get the best out of the package. It seemed a long time since I was last in the car but straight away I can feel the benefit of the development work which has been carried out in the break, so this is a nice feeling as we know we have to keep pushing hard in the early part of the season in particular. This morning the track was very dirty and it was quite difficult in places, but it wasn't so long before I was up to speed and by the end of the day the conditions were improving. Generally a good day and I am happy so far."
Max Chilton: "For a day that started so positively this morning, it is disappointing to have suffered such a setback in the afternoon session. This morning I was really pleased with the car balance and I could feel the benefit of the updates we have here. I was less than a tenth from Jules after FP1 and feeling that we had a nice rhythm going for FP2. Unfortunately that was short-lived as I'd completed just four laps before the engine cut to protect itself and I had to pull over on track. I have to pay credit to the guys for turning the car around so quickly to try to get me out again. Clearly we hadn't quite got the full measure of the problem, but it was a great effort nonetheless. Tomorrow will be quite a challenge so a big night ahead with the engineers comparing data and doing everything we can to hit the ground running for FP3 ready for qualifying."
Giedo van der Garde: "Both practice sessions for me were ok but we've had issues all day that have held us back a bit. This morning we had a KERS issue that meant we were running without KERS for the whole session, and that obviously didn't help, and then in the afternoon I overcooked it going into turn one on one of the medium sets and that meant we had to cut short the FP2 plan so we didn't use up another set of tyres. Despite that we have a lot of good data on the medium tyres from both sessions and the performance run on the softs went ok. Degradation levels are going to be big here, particularly on the softs which had pretty much gone by the end of the long run we did on them, so we'll have to look closely at how we deal with that on Sunday. We know this isn't going to be a particularly easy weekend for us but I still think we can fight tomorrow and on Sunday. The atmosphere in the team is good and if we can repeat the sort of race performance we had on Sunday in Malaysia we'll be ok."
Charles Pic: "I sat out FP1 for Ma and was then back in for FP2. It didn't start all that well as it felt like I had a hydraulics problem early on the first run but we took a look at it in the garage and managed to sort it out pretty quickly. However, that problem did mean we lost enough time to miss one of the runs and that was important for giving us enough options on car setup. Despite that we got on with the normal program, running a couple of setup options on the medium tyres, then onto the performance run on the softs and finishing with a long run on the softs to see how they hold up over a longer distance. The quickest laptimes seem to be on the first lap on the softs but I didn't have a clean lap on my fastest run and that hit my time, but we've completed a lot of mileage today and have a couple of setup options to look at for tomorrow so we'll look for areas to improve tonight and hopefully we can push on tomorrow."