Day four of pre-season testing in Bahrain as it happened

Text commentary of day four of the second pre-season test in Bahrain where Nico Rosberg finishes fastest.

22 February 2014 Last updated at 06:34

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As it happened

  1. 14:30: 

    That's just about it from me. Thanks for your company and contributions over the last four days. We'll be back next Thursday to bring you live coverage of the third and final test, which also takes place in Bahrain. Until then, it's a very good afternoon from me.

  2. 14:25: 

    Jennie Gow has gone behind the scenes at the second Formula 1 pre-season test in Bahrain. Fancy a peek? Check out the video here.

  3. 14:20: 

    Here's Andrew Benson's report. Keep an eye on the website later today for reaction and analysis from the Bahrain paddock.

  4.  

    Marussia: Today we have experienced a continuation of some component reliability issues. So, we opted for a change of strategy. Instead of persevering, we've been working feverishly to fit some revised parts which had arrived for next week and shake them down today.

  5. 14:16: 

    Well here you go...

    Best times overall during the second pre-season test in Bahrain:

    1. Nico Rosberg (Mercedes) 1:33.283

    2. Lewis Hamilton (Mercedes) 1:34.263

    3. Kevin Magnussen (McLaren) 1:34.910

    4. Jenson Button (McLaren) 1:34.957

    5. Nico Hulkenberg (Force India) 1:36.445

    6. Fernando Alonso (Ferrari) 1:36.516

    7. Kimi Raikkonen (Ferrari) 1:36.718

    8. Felipe Massa (Williams) 1:37.066

    9. Esteban Gutierrez (Sauber) 1:37.180

    10. Valtteri Bottas (Williams) 1:37.328

    11. Sergio Perez (Force India) 1:37.367

    12. Felipe Nasr (William) 1:37.569

    13. Pastor Maldonado (Lotus) 1:38.707

    14. Daniil Kvyat (Toro Rosso) 1:38.974

    15. Daniel Ricciardo (Red Bull) 1:39.837

    16. Kamui Kobayashi (Caterham) 139.855

    17. Sebastian Vettel (Red Bull) 1:40.340

    18. Adrian Sutil (Sauber) 1:40.443

    19. Jean-Eric Vergne (Toro Rosso) 1:40.609

    20. Romain Grosjean (Lotus) 1:41.670

    21. Marcus Ericsson (Caterham) 1:42.130

    22. Max Chilton (Marussia) 1:42.511

    23. Robin Frijns (Caterham) 1:42.534

  6. 14:10: 

    So do you fancy having a look at who was fastest overall this week in Bahrain?

  7. 14:05: 

    A good day for Mercedes, then, who completed a race simulation and ended up with the fastest time of the day. It was not so good for Red Bull who managed just 15 laps. Kimi Raikkonen got 81 laps under his belt, but then he went and stuck his Ferrari in the barriers.

  8. 14:00: 
    CHEQUERED FLAG
    Nico Rosberg

    Mercedes' Nico Rosberg finishes fastest on the final day of the second pre-season test in Bahrain.

  9. 13:58: 

    Drama at the end of testing as Kimi Raikkonen rips the front wing off his Ferrari. The crane is in attendance. The session is effectively over.

  10. 13:56: 
    RED FLAG

    Kimi Raikkonen has crashed his Ferrari!

  11. 13:52: 
    GO! GO! GO!

    We're green! Kimi Raikkonen, Felipe Nasr, Pastor Maldonado, Jean-Eric Vergne, Kamui Kobayashi and Jules Bianchi all pile out of the garage. It's like the start of the final part of qualifying. Eight minutes to go...

  12. 13:50: 

    We're into the final 10 minutes of this test, but we've not got a green flag yet...

  13. 13:45: 

    Jean-Eric Vergne pulls into the pits after the red flag and his Toro Rosso team use the opportunity to practise a pit stop before rolling the Frenchman back into the garage.

  14. 13:42: 
    RED FLAG

    The red flag is out for the sixth time today as Sauber's Adrian Sutil - who has hardly done any running today - comes to a stop out on track.

  15. 13:40: 
    Dan Knutson

    F1 journalist Dan Knutson: "When the cars come into the pits the mechanics have hand-held blowers that they use to blow air onto the brakes to cool them. As you can see from this photo taken earlier today, at Lotus they also attach a hose to the back of the top of the air box and blow air in to that as well."

  16. 13:35: 
    Red Bull

    It looks like Red Bull have shut up shop and gone home...

  17.  

    Williams: 80 laps now for our new test driver #Nasr as he gets some longer runs in this afternoon - his quickest time today a 1:37.569 on medium tyres.

  18. 13:30: 

    Kamui Kobayashi has the track to himself in the Caterham as we enter the final hour of the second pre-season test in Bahrain.

  19.  

    Mercedes: There's a lot of stripping and tweaking going on in the garage as we end the second test. Oh and the car's being worked on too...

  20. 13:22: 

    It's been a disappointing day for Jean-Eric Vergne, the Frenchman managing just eight laps. But he makes that nine when he heads out on track in the Toro Rosso.

  21. 13:20: 

    Kamui Kobayashi gets on the timesheets, the Japanese slotting into ninth, 11 seconds off the pace and eight tenths quicker than Caterham team-mate Marcus Ericsson.

  22. 13:15: 

    Pastor Maldonado sets the fastest time by a Renault-powered car so far during this test when he clocks a 1:38.7, 5.4 seconds off the pace set by Nico Rosberg in the Mercedes.

  23. 13:10: 
    Ferrari

    F1 journalist Dan Knutson: "Kimi Raikkonen is about to drive out of the garage. Moments later his Ferrari engine backfired. The sharp, very loud crack made the mechanics inside the garage and people in pitlane outside the garage jump."

  24.  

    Mercedes: Stoppage on track for @nico_rosberg at turn 3. Car's back and team are looking into it. Not long left now so that's it for our running today.

  25. 13:05: 

    Caterham's hard work has paid off as the team have got the car ready to go. Kamui Kobayashi wastes no time in belting himself in and heading out on track.

  26. 13:00: 

    The Mercedes is back in the pits and the green light at the end of the pit lane has flickered on. Let the final hour of testing begin...

  27. 12:54: 
    RED FLAG

    Mercedes' Nico Rosberg has come to a stop on track for the second time today. This time, he's ground to a halt at turn three.

  28. 12:53: 
    RED FLAG

    We have our fifth red flag of the day, with just over an hour of the session remaining.

  29.  

    Caterham: Engine fired up, floor going on. Will we be back out before the end of day 4? Bloomin' well hope so after the effort put in today.

  30.  

    Mercedes: Back in the garage @nico_rosberg having a spot of food and a chat with Keke! The running programme continues. To the track we go!

  31.  
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    Alex Fretwell: Ferrari might just dominate this year, two best drivers, better facilities, quietly getting good work done.

  32. 12:47: 
    Daniel Ricciardo

    F1 journalist Dan Knutson: "Daniel Ricciardo looked pensive as he sat at a table in Red Bull's hospitality area. But his trademark smile was soon back.

    "He's only done 15 laps today, but he said yesterday that he is sure the RB10 will be a quick car once the team gets it up and running properly."

  33. 12:44: 

    Felipe Nasr sets a new personal best, the Williams third driver getting down into the 1m37s. The Brazilian is still 4.2 seconds off the pace.

  34. 12:37: 

    Kimi Raikkonen is still out on track in the Ferrari, but now he's got the Lotus of Pastor Maldonado for company.

  35. 12:27: 

    Kimi Raikkonen breaks the silence, the 2007 world champion breaking the silence by taking his Ferrari out for a spin.

  36. 12:25: 

    Little to report with regards the track action - because there isn't any.

  37.  
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    Scott Ambrose: We'll be lucky if it's not only Mercedes, McLaren and Williams who finish the race in Melbourne.

  38. 12:21: 
    Red Bull garage

    This is becoming an all too familiar sight outside the Red Bull garage. Barriers up, lots of tinkering with the. The pressure is well and truly on.

  39.   
    BBC 5 live pit-lane reporter Jennie Gow:

    "It looks like the more running Red Bull do, the more problems they find. They have only completed 15 laps today and it's touch and go as to whether they will get back out. This time the problem is not Renault related. Lots of parts need replacing so their test may be finished with one hour and 45 minutes to go."

  40.  

    McLaren driver Kevin Magnussen: I've just arrived at the track. Let's see what's going on.

  41. 12:10: 

    BBC Radio 5 live reporter Jennie Gow reports that Mercedes and Nico Rosberg have finished their race simulation run. Good going from the Brackley-based team.

  42.  

    Sauber: #C33 threw a bit of a tantrum this morning and was incredibly shy. Glad our crew convinced it to get back on track.

  43. 12:05: 
    Esteban Gutierrez and Josef Leberer

    F1 journalist Dan Knutson: "Esteban Gutierrez, who is not driving today, has been monitoring things from pit lane. Here he is chatting with Sauber's trainer Josef Leberer. Leberer has worked in F1 for decades and used to work with Ayrton Senna at McLaren and Williams."

  44. 12:02: 

    Williams' Felipe Nasr continues to pump in the lap times, the Brazilian setting a new personal best time of 1:38.9, but he stays fourth.

  45. 12:00: 

    BBC Radio 5 live pit lane report Jennie Gow reports that the second pre-season test is over for Force India.

    Sergio Perez stopped out on track early in the session with a gearbox issue and they're unable to fix it before the end of play, so they've decided to can it and focus on next week's final test, which also takes place in Bahrain.

  46.  

    Sauber: "Twitter check, twitter check." "Do you all retweet?" Good, because the #C33 just left the garage.

  47. 11:54: 

    The Sauber has finally left the garage, nearly seven hours after the session began...

  48.   
    BBC 5 live pit-lane reporter Jennie Gow:

    "Five laps to go until @nico_rosberg finished a fall race sim for @MercedesAMGF1 - first time the team will make it to the end touch wood."

  49. 11:46: 
    Sergio Perez

    F1 journalist Dan Knutson: Sergio Perez was kicking a football around while the Force India crew worked on the car. During the season, Nico Rosberg does this before qualifying and the race to sharpen his reflexes.

  50. 11:42: 

    McLaren's Jenson Button and Mercedes' Nico Rosberg head back out on track, with Marussia reporting that Jules Bianchi is in the car and ready to get down to work.

  51. 11:40: 
    GO! GO! GO!

    The marshals have cleared the Lotus which means the session can get back under way.

  52. 11:30: 
    RED FLAG

    The red flag is out. Pastor Maldonado in the Lotus is the culprit.

  53.  
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    Andy: "Mercedes are looking very strong in the first two pre-season tests. It'll be very interesting to see how the relationship between Lewis Hamilton and Nico Rosberg holds up if the two teammates are battling for the title. I get the feeling that if push comes to shove there'll be no love lost."

  54. 11:25: 

    Jenson Button is back out in the McLaren along with the Mercedes of Nico Rosberg and the Lotus of Pastor Maldonado.

  55. 11:20: 

    The Williams rejoins the fray with Felipe Nasr at the wheel. The Brazilian has had a solid day so far, clocking up 56 laps on his first time in the 2014 car.

    Nico Rosberg has done the most laps today, his tally at 67 - the same number team-mate Lewis Hamilton managed yesterday - and counting. Two hours and 40 minutes left until the end of the session.

  56. 11:14: 

    Pastor Maldonado might not be getting as many laps in as he'd have hoped at Bahrain, but his Lotus team-mate Romain Grosjean isn't having much luck over at Heathrow Airport.

    The Frenchman tweets that the plane he's scheduled to fly to Moscow on has a technical issue so he's sat around waiting for a new plane to arrive.

  57. 11:08: 

    It's a four-lap run for Jenson Button in the McLaren before he dives back to the pits. The Briton has clocked up 44 laps today, just less than half the total he managed last year.

  58.   
    BBC 5 live pit-lane reporter Jennie Gow:
    Mercedes pit stop

    "So @nicorosberg heads out on a race simulation. It's his second pit stop, from soft to medium. Steering wheel change simulation."

  59. 11:02: 

    As we enter the final three hours of testing, Nico Rosberg continues to lead the way in the Mercedes, 1.6 seconds clear of Jenson Button with Kimi Raikkonen a further 1.8 seconds adrift in third. Sauber and Adrian Sutil have yet to make an appearance.

  60. 10:55: 

    It's an improvement for Pastor Maldonado, the Venezuelan clocking a 1:41.5 to move into seventh, 8.2 seconds off the pace in the Lotus.

  61.   
    BBC Sport's chief F1 writer Andrew Benson:

    "It looks like there is going to be a tweak to qualifying this year, to prevent the scenario of some teams not running in the top 10 shoot-out in order to save tyres for the race. F1's strategy group - the new rule-making body, effectively - has proposed that those in Q3, as it is called, get an extra set of 'option' tyres for use only in that session.

    "Drivers will now have to start the race on the set of tyres on which they set their best time in the second part of qualifying. The teams' sporting directors were asked if there were any major problems with the idea and when they met on Friday they agreed that while they had a couple of minor comments, there were no big issues and it would do what was intended. So expect that to be formally adopted as a rule at the next strategy group meeting on Friday."

  62.   
    BBC 5 live pit-lane reporter Jennie Gow:

    Thanks @MercedesAMGF1 & @rocketf1 for lunch. It's Schumacher pasta - what he loved to eat all the time at the team.

    Check out a picture of the pasta here.

  63. 10:48: 

    Pastor Maldonado is busy out on track in the Lotus. It's just him and Nico Rosberg's Mercedes out there at the moment.

  64. 10:43: 

    Force India's Sergio Perez stopped out on track just over two hours ago and it seems we won't be seeing the Mexican back on track any time soon as the team have not got to the bottom of the problem.

  65. 10:38: 

    Red Bull's Daniel Ricciardo heads back out on track, just as Ferrari's Kimi Raikkonen pits. The Australian will have Nico Rosberg for company, the Mercedes driving busy clocking up the laps.

  66.   
    BBC Sport's chief F1 writer Andrew Benson:

    "There has been a lot of talk in the media in recent days that former Peugeot rally boss Olivier Quesnel was to join Lotus to replace team principal Eric Boullier, who is now at McLaren. But this is not going to happen. Lotus chairman Gerard Lopez and CEO Matthew Carter are running the team on a temporary basis at the moment. Lotus will eventually need a replacement for Boullier but there is not one on the horizon for now, and whoever it is, it certainly won't be Quesnel."

  67. 10:31: 
    Bahrain paddock

    F1 journalist Dan Knutson: "With the sun shining and just a few cars out on the track - and making a lot less racket than last year's V8s - the paddock has a laidback peaceful feel about it this afternoon.

    "Lots of birds are chattering away happily in the palm trees and are not being drowned out by the engine noise. Bernie Ecclestone would NEVER allow forklifts to be parked in the paddock during the day on a grand prix weekend!"

  68. 10:26: 
    Felipe Massa and his son

    If you squint, you can see Felipe Massa at the top left of this picture leaning up against the side of the pit wall with his son watching as the Marussia peels into the pits. The Brazilian has been given a day off today with the third driver Felipe Nasr carrying out the duties for Williams.

  69. 10:20: 

    Felipe Nasr is back out on track in the Williams. He's soon joined by Nico Rosberg in the Mercedes and Ferrari's Kimi Raikkonen.

  70. 10:15: 

    You might also want to use this quiet time to read a piece on our Winter Olympics index which looks at how McLaren have helped the British bobsleigh team's medal bid in Sochi through a technology partnership.

  71.  
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    Jenni from Newtownards: Here's hoping that Mercedes and McLaren can deliver competitive cars right from the beginning of the season. We'd all love to see Lewis and Jenson going wheel-to-wheel for the F1 Drivers Championship. That's my one wish for the new season.

  72. 10:10: 

    With the lull in the action, now seems like a good time to round-up the day so far. Nico Rosberg is flying, the Mercedes driver clocking the fastest time set all week on the soft tyre.

    Williams are giving their new third driver Felipe Nasr a run out. The Brazilian, who has completed nearly 50 laps, will be in action in five first practice sessions during grand prix weekends this year.

    Lotus and Red Bull have only completed a handful of laps.

  73. 10:06: 

    The track has gone quiet. Perhaps the teams are enjoying a spot of lunch...

  74. 10:00: 
    Lotus

    F1 journalist Dan Knutson: "Looks like Lotus has started a programme to train its pit crew at a very early age!"

  75.   
    BBC Sport's chief F1 writer Andrew Benson:

    "McLaren are under pressure to improve after a disastrous 2013, and the early signs are promising. The car has looked quick and has generally been reliable so far. Jenson Button said the team were confident they were back in the general ballpark. 'We know we are not the quickest,' he said.

    "'We know we are not slow either, and the great thing is that we have a lot of laps under our belt. We can do a race distance. That is promising and I think it just shows how tough last year was for us. The guys have done a fantastic job. The guys are so pumped for this year, after such a bad year. It's good to see the buzz is back at McLaren.'"

  76. 09:55: 

    Kimi Raikkonen is back out in the Ferrari, the Finn improving on his personal best but remaining third fastest behind Nico Rosberg and Jenson Button.

  77. 09:53: 
    Felipe Nasr

    Williams' new third and reserve driver Felipe Nasr is doing a good job, the Brazilian clocking up 47 laps in his Mercedes powered car.

  78. 09:48: 

    Pastor Maldonado pits which leaves just Felipe Nasr and Jules Bianchi on track at the moment. However, I'm hearing Red Bull and Daniel Ricciardo are preparing to head out on track.

  79. 09:42: 

    Lotus' Pastor Maldonado gets his name on the timesheets with a 1:44.2 which is 10 seconds off the pace.

  80.   
    BBC Sport's chief F1 writer Andrew Benson:

    "How are the new generation of Formula 1 cars different from last year's? Lewis Hamilton says the answer is simple. 'We have a lot more power than we did last year,' he says. 'There is less grip so less braking capability. You can't go flat out in the high-speed corner here for example. There is lot more movement in the car but generally speaking the biggest difference is the power.' Hamilton, incidentally, added that he was already feeling more comfortable with the braking in the new Mercedes than he had last year, when some of you may remember braking feel- which is critical to his ability to take the car to the limits with his driving style - was a consistent complaint. But he says he still has plenty of work to do to get on top of the complexities of the new cars. He is back next week; team-mate Nico Rosberg conducts the final day of this week's testing for Mercedes."

  81.  

    Lotus: Just waiting for the instruction: 'we're going full throttle' - no no, no no no no, no no no no, no no, there's no limits...

  82. 09:35: 

    Pastor Maldonado is back out in the Lotus with the Venezuelan tasked with running through a variety of settings and programmes in his early laps. The former Williams driver has yet to set a lap time today.

  83. 09:31: 
    Felipe Massa and Valtteri Bottas

    Williams' Felipe Massa and Valtteri Bottas are soaking up the sun and having a chat on the pit wall while the team's new reserve driver Felipe Nasr does the hard work in the car.

  84. 09:26: 

    Marussia's Jules Bianchi makes it back to the garage after a single installation lap. Providing all is well with the car, the Frenchman should be out again soon to start data gathering.

  85.   
    BBC Sport's chief F1 writer Andrew Benson:

    "Before the start of pre-season testing, all the teams were agreed on one thing - it would be impossible to tell who was in best shape until the cars ran in Melbourne at the first race. Except it has not turned out that way. Seven days into pre-season testing, and one thing seems abundantly clear - Mercedes are in formidable. McLaren's Jenson Button alluded to this when he said: 'No-one knows who's going to be on pole in Melbourne. (But) I think I have a good idea.'"

  86.   
    BBC 5 live pit-lane reporter Jennie Gow:

    "Ferrari have generally run reliably in pre-season testing so far but they hit problems with Kimi Raikkonen on Friday. They owned up to a failure of the 'data connection with the telemetry', but there were other issues too. Watching from trackside, an engineer from a rival team said fuel was getting into the exhaust on both the works car and the Ferrari-engined Sauber, causing it to misfire. It is a new problem - it was not happening at the first test in Jerez.

    "Engineering director Pat Fry said after running on Friday that Ferrari's problems were 'small issues' that took a long time to solve because of the complexity of the cars. And he sounded confident about reliability: 'If you were to say we had to go and do a race distance tomorrow, I don't think it would be a problem.' He added that there were no major upgrades at this test, just parts they were trying to check the correlation between track and wind tunnel."

  87.  

    Caterham driver Marcus Ericsson on Instagram: Happy to get the chance to drive again this AM. But unfortunately we had a problem after four laps which meant end of the day for me.

    Now the guys @caterhamf1 are pushing hard to get the car ready for the PM session when @kamuikobayashi is in the car. Still I have now done over 100 laps and I have learned so much! Can't wait to drive again next week!

  88. 09:15: 

    The Marussia breaks cover for the first time today as Jules Bianchi heads out to complete an installation lap. The team say the plan is then progress towards short runs.

  89. 09:12: 

    Ricciardo is followed back into the pits by everyone else so the track falls silent. We've yet to see the Sauber or Marussia in action today, while Lotus and Red Bull have done very little running.

  90. 09:07: 

    Daniel Ricciardo gets down into the high 1m39s as he brings his lap count into double figures before diving back into the pits.

  91. 09:03: 

    Daniel Ricciardo lapping in the 1m40s early on. I suspect the Australian will simply be delighted to be driving at all. Every lap is crucial as he looks to get comfortable in his new car having left Toro Rosso for Red Bull.

  92.  

    Marussia: We've spent the morning so far resolving a systems problem and now we're aiming to be back on track very soon

  93. 08:56: 

    Red Bull's Daniel Ricciardo heads out on track, followed by Kimi Raikkonen, Felipe Nasr and Jenson Button.

  94. 08:54: 

    What's that in the Red Bull garage? Is it an engine being fired up? Why yes it is.

  95. 08:52: 

    Force India have the car back in the garage and are investigating the problem. I'm told it'll be a while until Sergio Perez is back out on track.

  96. 08:48: 
    GO! GO! GO!

    The marshals have cleared the Force India and we're back under way at the Bahrain International Circuit.

  97.   
    BBC Sport's chief F1 writer Andrew Benson:

    "Such are the problems at Renault and Red Bull, who have done something like a sixth of the mileage of Mercedes, that outside the team people are already beginning to assume they cannot possibly be competitive at the first race. Red Bull's Daniel Ricciardo did not disagree with the framing of a question along those lines on Friday, but he did say: 'Even if the first four or five races didn't go to plan and then we go and win the next 10, who cares? We want everything to go well in Melbourne and we will stay optimistic until after the race.'"

  98. 08:39: 
    RED FLAG

    Force India's Sergio Perez brings up the third red flag of the day as the Mexican grinds to a halt on track.

  99. 08:36: 

    Marcus Ericsson's Bahrain test is over. The Swedish Caterham driver stopped out on track this morning and the team are still working on fixing the problem. So they've decided to call it a morning and get the car set up for race driver Kamui Kobayashi to take over this afternoon.

  100. 08:30: 
    Kimi Raikkonen

    Ferrari's Kimi Raikkonen sets a new personal best, but he's still third on the timesheets, 4.3 seconds off the pace.

  101. 08:28: 

    Marussia haven't been out this morning, but I'm told it won't be long until we see the black and red car out on track.

  102. 08:25: 

    Nico Rosberg nips out for just one flying lap - but it's a good one, the German clocking a 1:33.2 on the soft tyres.

  103. 08:20: 

    Sergio Perez makes it seven drivers to have set a lap time, the Mexican clocking a 1:39.2 in his Force India.

  104. 08:15: 
    Nico Rosberg

    F1 journalist Dan Knutson: "At Jerez, there were a total of 16 red flags - four, three, six and three respectively over the four days. Here we've had four on day one, four on day two, three on day three, and two so far on day four. Mercedes and Rosberg caused the second red flag. The Mercedes mechanics are using screens to try keep their car hidden as it is lifted off the flat bed truck."

  105. 08:10: 

    Nico Rosberg sets the fastest time of the week with a 1:33.6 to extend his lead over McLaren's Jenson Button two three seconds.

  106. 08:06: 

    We've yet to see the Sauber or the Marussia with Red Bull managing just the single lap before heading back to the garage.

  107. 08:02: 

    With just over two hours of the session gone, Nico Rosberg leads the way in the Mercedes, two seconds clear of Jenson Button in the McLaren.

    Kimi Raikkonen is third fastest, with Felipe Nasr fourth, Jean-Eric Vergne fifth and Marcus Ericsson sixth. No other times have been set.

  108.  

    Force India: Ten laps and our aero work is complete. Checo steps out of car as we get it ready for today's baseline set up programme.

  109. 07:58: 

    Jenson Button is out and about in his McLaren as is Felipe Nasr in the Williams. They're soon joined by the Mercedes of Nico Rosberg.

  110.  
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    Rachel T: Just eavesdropping on the kids - they are testing each other on how to spell F1 drivers names! Haha! The season needs to start SOON.

  111. 07:53: 

    Mercedes fans can breathe a sigh of relief after Nico Rosberg stopped out on track. The team tweet: "No problems with the car, just a stall following a practice start at the end of the pit lane. We'll be back out again soon." Rosberg might be slightly embarrassed, mind.

  112. 07:51: 
    GO! GO! GO!

    We're back to green flag conditions, with Ferrari sending Kimi Raikkonen out straight away.

  113.  

    Ferrari: Two red flags so far today. Each time you lose about 20 minutes of time. 12 days of testing per team. 6 per driver. Will it be enough?

  114.  

    Lotus: Install done, data collected. Time to strip off the data-collection kit before the next run.

  115. 07:45: 

    With Pastor Maldonado in the Lotus for the final day of the test, team-mate Romain Grosjean's work is done. "Flying to Moscow today for the Moscow Ice Race with @RenaultSportF1," he tweets. "I guess I'll loose about 50 degrees Celsius from @BAH_Int_Circuit."

  116. 07:40: 
    RED FLAG

    Nico Rosberg has come to a stop out on track in his Mercedes so out comes the red flag.

  117. 07:35: 

    Pastor Maldonado manages two laps before peeling back into the pits. His Lotus team report that the delay in getting out was because parts from their factory arrived and were fitted overnight and the work was finished off this morning.

  118.   
    BBC Sport's chief F1 writer Andrew Benson:

    "It would be fair to say that things are not going that well over at Lotus. They skipped the first pre-season test because the car was not ready, and in Bahrain this week they have achieved a grand total of 52 laps over three days following a succession of problems - both with the car and that pesky Renault power-unit. Even worse, they are unlikely to be out first thing because the parts they need to fix the gearbox problem that ended Pastor Maldonado's day on Friday have to be flown in from England. But trackside operations director Alan Permane said he was 'very confident of a good day and a step in performance' on Saturday. With only four days of testing remaining after this one, they really, really need it."

  119. 07:30: 

    It looks like we'll be seeing the Lotus pretty soon as the team are firing up the E22, with it's "twin-tusk" nose, ready for their first run of the day, 90 minutes after the session started.

  120. 07:25: 

    Mercedes' Nico Rosberg clocks a 1:34.8 on the medium tyres to extend his advantage at the top of the pile to 2.2 seconds.

  121.   
    BBC 5 live pit-lane reporter Jennie Gow:

    "I'm out on the track watching at Turn Eight, a slow right-hand hairpin. There's no doubt the new engines are different from the old V8s we had become used to. While the V8s were ear-splitting, with the new turbos you can still hold a conversation even when a few cars come around together. The engines have a really guttural sound - a bit like a spin cycle on a washing machine! - as all the energy-recovery systems do their work. But on the straight they sound like jet fighters. And we can hear birds tweeting overhead. It's quite serene, really."

  122. 07:15: 

    Marcus Ericsson brought out the first red flag of the day earlier this morning, with the Caterham team now busy trying to work out what went wrong.

    "The car's back, the bodywork and floor are off and investigations continue into the cause of the issue. More information when we have it," they tweet. "Testing is testing, that's why it's called testing."

  123.  

    Mercedes: Happy Birthday chairman Niki, 65 today #HappyBirthdayNikiLauda

  124. 07:10: 

    Nico Rosberg is the early pace-setter, with just over an hour gone of the first test. The Mercedes driver clocks a 1:36.2, eight tenths quicker than Jenson Button manages in the McLaren. Kimi Raikkonen slots into third, two seconds adrift in the Ferrari.

  125.   
    BBC Sport's chief F1 writer Andrew Benson:
    Daniel Ricciardo

    "Red Bull ended their running early on Friday after discovering a 'mechanical gremlin', which it turns out was a gearbox failure. The idea, said Daniel Ricciardo, was to 'get a full day' on Saturday. If they do, it would be a major breakthrough, but even if they do, don't expect scintillating lap times.

    "Engine partner Renault is still a long way behind rivals Mercedes and Ferrari, and the power-unit is running some 100-150bhp down at the moment. 'We knew coming here it was probably going to take a bit of time,' Ricciardo said. 'We are making the steps we expected to make, it's still not enough, but we're getting there.'"

  126. 07:07: 

    Here come the big guns - and based on current form, that doesn't include Red Bull - with Mercedes' Nico Rosberg, McLaren's Jenson Button and Ferrari's Kimi Raikkonen crossing the line to start their first flying laps of the morning.

  127. 07:03: 
    Who is Felipe Nasr?

    For those unfamiliar with Felipe Nasr, let me enlighten you...

    The Brazilian started karting when he was seven before progressing up the ranks and winning the Formula BMW Europe title in his first season with seven wins in 16 starts.

    Two years later, he won the British Formula Three title, after securing seven wins. In 2012, he had his first season in GP2, the feeder series to F1, and was the second-highest rookie. Last year, he finished fourth overall.

    Nasr, who names fishing as one of his hobbies, said: "I'm really happy to be joining the Williams family. They have a great history in the sport and some of the greatest Brazilian drivers of all time have driven for the team, so it's an honour to join names such as Piquet, Senna and Massa."

  128. 06:59: 

    Felipe Nasr, Williams' new reserve driver, has headed out on track for the first time and immediately gets down to business, clocking the second fastest lap of the morning.

    Next time around, he improves to a 1:40.0 which moves him to the top of the charts, ahead of Jean-Eric Vergne and Marcus Ericsson.

  129. 06:55: 
    Get involved

    I can't believe we're almost at the end of the second pre-season test already. Eight days of testing almost done and dusted, just four left to go before the new season is upon us.

    What can we expect in Australia? Who is your dark horse for the early part of the year? What are you most looking forward this season? You know the drill.

    Tweet us using the #bbcf1 hashtag or text 81111 (UK only), remembering to put your name on those SMS messages.

  130.   
    BBC Sport's chief F1 writer Andrew Benson:

    "This final day of running in Bahrain this week marks the two-thirds point of pre-season testing 2014. After this, there are only four days next week - again in Bahrain - for the teams to hone their cars on track before they go to Australia for the first race. All of the teams have a mountain of work to do in that time, but some are starting from a better point than others. Mercedes will use this final day to keep on with preparations after a good week; McLaren and the other Mercedes-engined teams, too. Ferrari don't look in too bad a shape either. But the Renault teams - and particularly Red Bull and Lotus - remain in all sorts of trouble. Can they finally get their programmes properly on track - so to speak - in the next eight hours?"

  131.  

    Force India: First task on the job list in Bahrain is some aero work. @SChecoPerez out on track now. Lots of very short runs planned.

  132. 06:50: 
    Jean-Eric Vergne

    We're back under green flag conditions now, though, with Jean-Eric Vergne going fastest with a 1:41.7 in the Toro Rosso.

  133. 06:48: 
    RED FLAG

    We've also had our first red flag of the day, Marcus Ericsson rolling to a stop in his Caterham. Not the ideal start for the Swede.

  134.   
    BBC Sport's chief F1 writer Andrew Benson:

    "There's a distinct Brazilian flavour to Williams this season, with the arrival of Felipe Massa from Ferrari as driver and attendant sponsorship. That has now become even more the case with their signing of another Brazilian Felipe - Nasr - as reserve driver. The 21-year-old will do three of the four in-season tests and take part in five first practice sessions through the season, as well as help with development in the simulator."

  135. 06:42: 

    Wondering why Felipe Nasr is in the Williams? Ah, well there has been a bit of news overnight....

  136. 06:40: 

    Here's who we can expect to be in action on the fourth and final day of the second pre-season test in Bahrain.

    Red Bull - Daniel Ricciardo

    Mercedes - Nico Rosberg

    Ferrari - Kimi Raikkonen

    Lotus - Pastor Maldonado

    McLaren - Jenson Button

    Force India - Sergio Perez

    Sauber - Adrian Sutil

    Toro Rosso - Jean-Eric Vergne

    Williams - Felipe Nasr

    Marussia - Jules Bianchi

    Caterham - Kamui Kobayashi

  137. 06:36: 

    No they weren't. It took 18 minutes before Daniel Ricciardo managed to turn a wheel. Kimi Raikkonen, Jenson Button, Nico Rosberg, Marcus Ericsson and Sergio Perez have all completed installation laps.

  138. 06:33: 
    Kimi Raikkonen

    Hello everybody and welcome to our live text commentary of the fourth and final day of the second pre-season test in Bahrain. The session is already under way. Were Red Bull able to head out on time?

  139. 06:30: 

    Lewis Hamilton set a searing pace in the Bahrain heat on Thursday, but his Mercedes team struggled with reliability in the afternoon, much like their rivals Red Bull and Ferrari. Only McLaren clocked up a decent haul of laps, with Jenson Button completing 103 and the second fastest time. What does day four hold for the 11 teams?

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