As it happened: Test day four
By Jonathan Noble, Edd Straw, Glenn Freeman, Ben Anderson, AUTOSPORT staff and Jamie Klein
The live commentary has ended. No further updates will be posted.
| FASTEST TIMES
|| Kimi Raikkonen||Ferrari|| 1m20.841s|
|| Marcus Ericsson||Sauber|| 1m22.019s +1.178|
|| Lewis Hamilton||Mercedes|| 1m22.172s +1.331|
|| Max Verstappen||Toro Rosso|| 1m22.553s +1.712|
|| Felipe Massa||Williams|| 1m23.116s +2.275|
|| Romain Grosjean||Lotus|| 1m23.802s +2.961|
|| Daniil Kvyat||Red Bull|| 1m23.975s +3.134|
|| Jenson Button||McLaren|| 1m27.660s +6.819|
|All timing unofficial. Updated: 15:36 GMT
| CURRENT WEATHER
||12°C / 54°F
But Nasr was first to suggest that the Mercedes runners aren't showing their hand yet.
After yesterday's damp start, it's sunny and relatively clear.
Mercedes - Lewis Hamilton
Red Bull - Daniel Kvyat
Williams - Felipe Massa
Ferrari - Kimi Raikkonen
McLaren - Jenson Button
Toro Rosso - Max Verstappen
Lotus - Romain Grosjean
Sauber - Marcus Ericsson
"Hopefully a bit of dry running later on will allow us to see just how quick it is - and whether Honda and McLaren can really deliver on their winter optimism."
AUTOSPORT asked Maldonado if he had a message for his team-mate overnight based on his experience of the car, but unfortunately all we got in response was: "No message, just work through the programme." Disappointing.
However, Renault's problems at this test, caused by a 'stupid part', have prevented either of its teams from doing particularly long runs. Perhaps Toro Rosso will push the boundaries on that front a bit more today, given the mileage it has racked up.
@SauberF1Team: "The track is still damp in some places therefore hardly any cars out there. #ME9 in the garage."
@MercedesAMGF1: "Quiet start to the day: a tad greasy out there but the sun's out & there's dry lines appearing...#StayTuned"
Verstappen - 18
Ericsson - 17
Hamilton - 11
Kvyat - 8
Grosjean - 5
Massa - 4
Raikkonen - 3
Button - 1
Hamilton - 36
Verstappen - 28
Ericsson - 21
Raikkonen - 21
Grosjean - 8
Kvyat - 8
Massa - 4
Button - 1
Hamilton - 43
Verstappen - 39
Raikkonen - 30
Ericsson - 25
Grosjean - 23
Massa - 10
Kvyat - 8
Button - 4
* Hamilton brings out red flag with spin at the chicane
* Limited running again for Red Bull as Kvyat stops on track
* Raikkonen fastest for Ferrari on medium tyres
* McLaren-Honda completes only four laps so far
Marussia closes on surprise return for 2015
CRAIG SCARBOROUGH: "To create the springing effect of the suspension you can use metal springs (coil spring or torsion bars) or a hydraulic spring.
"Both can be tailored to create the ideal spring effect. Metal springs are simpler, less ‘tunable’, but reliable, whereas hydraulic springs can be packaged elsewhere on the car and can be tuned in situ, but risk unreliability.
"I doubt either is a huge performance differentiator."
@redbullracing: "It looks like an ERS problem... The Team are on the case and looking to get Dany back on track soon. #F1"
Hamilton - 52
Verstappen - 52
Raikkonen - 49
Grosjean - 42
Ericsson - 33
Massa - 27
Kvyat - 8
Button - 7
Raikkonen puts Ferrari back on top
Stefan Smit asks: "What are 'unmarked Perelli-tyres'? Are they experimenting compounds, or just want to keep a secret?
CRAIG SCARBOROUGH: "They are research tyres of slightly different compound/construction to the usual race tyres."
"Looks positive on turn-in but less under control in terms of the rear later in the corners."
At least he's getting some mileage now - 18 laps completed after ruining his first day in the car with that off and suffering an ERS problems this morning.
CRAIG SCARBOROUGH: "When off the throttle there’s a lot of engine management going on to minimise turbo lag and thus make power delivery smoother when the driver picks up the throttle again.
"This sounds like the odd mappings used when team’s blew the diffuser with exhaust gases.
"Ironically, what was good for exhaust-blown diffusers was largely based on anti-lag technology."
The Toro Rosso STR9 was heavily lampooned for its proboscis nose design in 2014, but has a more elegant solution on the new STR10.
Technical chief James Key says we can expect this to change again before the first race in Melbourne.
"You could race this [nose] tomorrow, but we want to start off with a car that runs because we didn’t get any mileage last year and we want to maximise it so this is a launch-spec car.
"We will have a race-spec car in test three that will look very different to this. Stuff at the front of the car will change. We are still in the windtunnel for Melbourne now so we are pushing the limits."
"The Merc looks really strong. Hamilton is committed into the chicane and able to get back on the throttle positively."
Morris added that McLaren is doing aero work this afternoon.
Hamilton - 78
Verstappen - 72
Raikkonen - 61
Ericsson - 53
Grosjean - 53
Massa - 41
Kvyat - 35
Button - 31
1 Raikkonen 1m21.516s
2 Verstappen +1.0s
3 Ericsson +2.0s
4 Hamilton +2.0s
5 Massa +2.1s
6 Grosjean +2.2s
7 Kvyat +2.7s
8 Button +6.1s
CRAIG SCARBOROUGH: "Ferrari has turned a corner, it just needs to catch up the last stretch to Mercedes. The car looks a lot more stable, improved engine power and drivability is helping balance in the turns and the aero looks far more sorted than last year.
"An image of the diffuser covered in flow-viz showed really good flow lines, compared to the disturbed air passing through last year's underbody.
"McLaren is harder to predict as it hasn't run as much. But if its 'size zero' rear end cools as well as it looks aerodynamically, then it could be a similar position to Ferrari after a half a season of on-track development."
@karunchandhok: "@BenAndersonAuto - Damon races : Silverstone 93 & 94, Suzuka 94, Monaco 96, Budapest 97. 2 races here he was leading superbly till DNF"
The other F1 engine manufacturer in trouble
BEN ANDERSON: "His two-year spell at Jordan was not generally Hill's finest chapter, but scoring Jordan's first win in Formula 1 was a special moment in a race fraught with crashes in atrocious conditions."
BEN ANDERSON: "Monaco was not as kind to Damon as it was to his father Graham. After Michael Schumacher crashed on the opening lap, Hill led superbly in the wet until his engine let go."
BEN ANDERSON: "Hill was generally poor in the FW17 and ended up getting sacked because of it, but Hungary was a rare occasion where he totally delivered: pole, win and fastest lap."
BEN ANDERSON: "Hill chose this GP as the 'race of his life' in AUTOSPORT. Beating Michael Schumacher in a straight fight in the wet was an exceptional feat."
BEN ANDERSON: "This is the race that made every Damon Hill fan's jaw drop. Qualified third, passed Schumacher's Ferrari to take the lead, and would have won easily but for a late hydraulics problem in the generally rubbish Arrows-Yamaha. The drive of a champion."
Hamilton - 101
Verstappen - 88
Raikkonen - 79
Ericsson - 76
Massa - 63
Kvyat - 56
Grosjean - 53
Button - 35
@Lotus_F1Team: "An early bath for us after 53 laps today. The data suggested something was amiss with the Power Unit. Productive first test nevertheless."
@McLarenF1: "We're not going to complete that fuel pump change before the chequer, so that's our running over for this test."
@SauberF1Team: "#ME9 made a check of the fuel system and ran out of fuel, as a result."
Credit to Sauber for being more honest than some other teams who have performed similar "checks" earlier this week and made a bad job of covering them up!
By contrast, McLaren drivers Jenson Button and Fernando Alonso sit bottom of the pile in terms of laptime and distance completed at this test.
Mercedes can leave here very happy - Nico Rosberg and Lewis Hamilton lead the way in the 'laps completed' column.
REPORT: Raikkonen fastest for Ferrari on final day
Starting this evening, we'll have news and analysis of what we've seen this week on autosport.com, with plenty more to come later in the week including the 10 key things we learned here, plus the thoughts of ex-F1 designer GARY ANDERSON.
We'll be back with live coverage from the next test at Barcelona, which starts on Thursday February 19. See you then!