ESPN rounds up all the reaction from up and down the paddock.
Mercedes
Nico Rosberg: It was a decent morning and we're making progress. It was nice for me to be able to push some more and produce some stronger lap times. We were doing qualifying practice this morning - it's important to practise that as well. And that's when it's all the more enjoyable; taking the car to the limit and really pushing. It's been a good test, reliability has been good, the speed has been there - it's all working to plan.
Lewis Hamilton: It was a great afternoon of running with great mileage. We did a race simulation and after that I feel I'm ready for race one. The car is feeling great and was consistent all day. It's been a monumental effort from this team to get the car to where it is today. I'm truly grateful to everyone for every bit of work they have put in so far.
Ferrari
Kimi Raikkonen: "It is normal to have some little issues during testing like we had with the gearbox today, but I am not concerned as we have time to fix it. That's the purpose of testing, learning new things and trying something different. We still have something to be done of course but it is a normal process this time of the year. It is a different story when we go racing. We will know pretty soon what will happen in Australia but so far the car feels good. I have no idea what the others are doing, lap times may vary with different tyres and fuel levels, but we know what we are doing and we are pretty happy with the way the car is handling. I think we have a very good package, time will tell if it is good enough."
Williams
Valtteri Bottas: It was a good day today. We managed to run without any major issues with the car. It was very interesting discovering more about the FW38 and what kind of set-ups work for this car. I think we managed to make progress. We did some short runs today which I really enjoyed. I still agree with what I said last week - we have improved in the areas where we were weak last year. I am looking forward to tomorrow and continuing testing.
Rod Nelson, Chief Test & Support Engineer: Today was a very good day for us. The car ran faultlessly. We did lots of quite significant tests throughout the day as well as a bit of a qualifying simulation. We managed to get through our planned programme without any major problems, so overall we are really pleased.
Red Bull
Daniil Kvyat: "We had a busy afternoon, which was good. We would obviously have liked to have done some more laps, but there is another day left available to me and I'll try to make that as busy as possible. This morning we had a little bit of an issue with the brake ducts and it took a little bit of time to sort it out, but the guys did a good job and for the rest of the day there were absolutely no issues."
Guillaume Rocquelin, Head of Race Engineering: "Not a fantastic first day back at the track for us, as in the morning we had a brake system issue. It wasn't a major issue - the fault was easy to rectify - but unfortunately there was some damage to one corner of the car and we therefore had to strip the back end, which was quite time consuming. When we got out in the afternoon we got stuck into the programme we had set for the day and we had a good second half to the day. Dany also had a run on the soft tyre. There was no suggestion of chasing lap time, but we just wanted to get a little bit more data. In all, not an ideal start to these final days in Barcelona but we'll keep plugging away.
Force India
Nico Hülkenberg: "It was a good day and we were able to get through a big testing plan. We had quite a few different objectives and specific items we wanted to look at, so to be able to do all that was a positive. We continue to build our understanding of the VJM09 and we explore ways to adapt to its behaviour: it's the usual learning process that takes place when you have a new car and you start developing it for the season. In the afternoon we were able to complete some long runs which were useful to learn about the way the tyres work."
Tom McCullough, Chief Race Engineer: "Another routine day of testing with ideal weather conditions for this time of year. The car ran reliably throughout the day and we covered 121 laps. We dedicated the early morning running to aero data correlation and fitted various test sensors to the VJM09. We then moved on to general set-up work and focussed on long run performance and further understanding of the 2016 tyres. Although the temperatures we see in these winter tests are not especially representative, it still gives us a reasonable idea of what we can expect from the early races. We need to analyse most of the tyre data tonight so that we can continue with the programme tomorrow with Sergio." Images are free for download for any editorial use, please credit Sahara Force India Formula One Team. Commercial use should be approved by Sahara Force India.
Renault
Kevin Magnussen: "It was another strong day with lots of laps completed. There's a positive feeling with this car but equally we know where we need to make improvements and that's what we're working towards. It's great to be able to get so much mileage for myself and the team as we can really make good progress."
Nick Chester, Chassis Technical Director: "A pretty good day for us with the car running reliably and completing 119 laps. We were able to work on both front and rear suspension set up as well as aero data logging which will give us further direction for the remainder of the test. All of today's programme has been completed so there is a satisfying amount of data to process ahead of tomorrow."
Toro Rosso
Max Verstappen: "It was a very good day! We completed plenty of laps and I think we can be very happy. Everything was running smoothly and we were able to go through the whole of our programme, which is always something positive to do. We tested a few parts and it was, all in all, a very productive day. Physically I'm also feeling good and I can't wait to be back in the car on Thursday - that will be my last time at the wheel of the STR11 before heading to Australia!"
Phil Charles, Chief Engineer: "It's been another good day for us. We spent the morning characterising some new aero parts. This is another good job from the factory to get those delivered to us in time after the very busy winter we've had. The rest of the day was a nice mix of set-up work followed by long-runs in the afternoon. We are spending more time on these, building our understanding of the car. There's perhaps still a bit of work to do on the tyres, but all in all we've learned quite a lot and the reliability has been a real positive for today, adding a further 144 laps to the team's tally."
Sauber
Felipe Nasr: "It was a productive roll-out day with the new Sauber C35-Ferrari - with more than 100 laps on the Barcelona Circuit. As usual on the first day of testing with the new car, we focussed on several installation and system checks, on set-up changes and, of course, on data collection. It was an extensive programme, on medium and soft tyres, from which we obtained interesting data to look into. For the following test days there is still a lot of work to do."
McLaren
Fernando Alonso: "After the disappointment of not being able to complete much running at the end of last week's test, it was positive to get so many laps on the board today. "We tested a number of different configurations and spent a lot of time working on the power unit and collecting data from the aerodynamics. It's too early to tell a real difference compared to the engine last week, as we focussed today on shorter runs and adjusting the balance and set-up of the car. "However, today's full day of running has been a good start to the second test, and has provided us with lots of useful data that we can analyse overnight before Jenson continues the programme tomorrow."
Matt Morris Director of Engineering: "After a busy and long weekend for the whole team out here at the track, back at MTC and in Sakura, we started the second test off on a positive note. It's always encouraging to get some good mileage under our belt on the first day. "We spent a good chunk of the day evaluating the power unit functionality, although our attention hasn't yet turned to assessing outright performance. The important thing was to get as many miles on this package as possible, so from that point of view and the amount of data we have collected today, it has been very positive. "We will continue to maximise our track time over the coming days, to work on ironing out reliability niggles and move on to longer runs. We also have some new aero parts arriving overnight, which will be assessed on track tomorrow with Jenson."
Yusuke Hasegawa Honda R&D Co Ltd Head of F1 Project & Executive Chief Engineer: "We had an unexpected control electronics shutdown just before lunch time, believed to be the cause of a software problem. Apart from that, we were able to run a decent amount of laps to finish the first day of the second test in Barcelona. "On the power unit side, we tested many different modes of running to prepare for the race, so it was a busy day for the system engineers. As a package, we were able to test different balances of the car and tyres together with the power unit. "We are looking to perform further detailed checks on the power unit during tomorrow's testing."
Manor
Rio Haryanto: "This afternoon has been really positive, so that has made up for the track time we lost this morning to an oil leak. That's what testing is for though so I'm happy that we quickly identified and got on top of the problem. We managed 43 laps this afternoon and as well as the core programme I worked through some controls procedures including practice starts. Pre-season testing is short so every lap counts but with one more day in the car to focus on race simulation and qualifying preparation, my confidence with the car and team is improving all the time."
Dave Ryan, Racing Director: "We encountered our first significant testing glitch this morning when an oil leak disrupted our programme. The leak itself was pretty straightforward to deal with but the source was difficult to reach and that's where we lost the time. Once fixed, we turned the car around quite quickly and managed to get Rio back out for a lap before the break to make sure we were on top of the problem for the afternoon. Rio responded well to the challenge of playing catch-up and his calm and focused approach contributed to a very smooth rest of day. Although we lost some valuable mileage, we're in a good place for the start of this week's test."
Haas
Esteban Gutierrez: "It wasn't an ideal day as we had some technical issues which we're still investigating. We wanted to do a lot of running and had setup work planned. However, we're working on our solutions and focusing on the next few days so we can get our program completed. Tomorrow is another day. The team is working hard to solve the issues and I'm confident we will. Hopefully, we can have a smoother day tomorrow."
Guenther Steiner, team principal: "Unfortunately in the morning we experienced some problems with the fuel system. We tried to fix it but we were unable to and had to stop running just before the lunch break. We will not be able to run again until tomorrow, so a little bit of a setback. But what makes you suffer makes you stronger. We take a step back, but we hope to make two forward tomorrow."