@Fritz: I'm not sure sound can be linked directly to power - if anything noise is wasted energy and these power units are about using energy efficiently. However, there will be many updates to the Honda engine before it is homologated at the end of February. This test is more about getting the car and engine working together.
@Arvind: At this stage, no.
Raikkonen is on a quick lap at the moment...
He kicks up a bit of spray at the final corner and crosses the line to set a 1:33.022. The fact that's over 10 seconds off the pace from yesterday tells you all you need to know about the track conditions.
@SpittingCobra: But if a car leaves the pits and returns on the same lap then it won't complete a full lap. Even if it stays out for an extra lap and comes in then it still hasn't done one whole lap.
@thari81: They say they are waiting for the track to dry a bit before sending Button back out.
@Laudasredcap: Nate has just arrived and will take over comms any second. So get your team-mate battle predictions lined up.
I'll be taking over from Laurence for the time being. Hamilton the only man out on track as it stands.
So far the morning is taking a familiar flavour for McLaren, they're at the bottom of the pack in both lap time (without a time set) and mileage.
One coming up for you now....
The team is "investigating". As soon as we know the issue, we'll let you know.
Hamilton lowers his time to a 1:26.998 as some tell-tale noises start coming from the McLaren garage....
Raikkonen has just put Ferrari top, however, with a 1:25.441.
@altaf: We don't know the fuel loads in each car in this test or any test, for that matter. That is why quick times and slower times need to be taken with a pinch of salt because often you are second guessing what sort of fuel run the teams are doing.
@MK: Yes, he'll be keeping the number 44 on his car this year rather than number one.
Verstappen is out there on slicks. He's cut his time down to a 1:27.423, good enough for third.
@Jay: Vettel chose the number 5 to accompany him for the rest of their career. When they win the championship, drivers have the choice between number one and their career number.
Raikkonen is still pumping out the quick laps, the latest a 1:25.011.
We have a Lotus on track as Grosjean comes back out on the medium tyre.
Grosjean slots into fourth position with a lap of 1:29.526. You'll notice the lap times are dropping rapidly now as the track is now dry.
@Snow: I think he's referring to 2007, when Hamilton and Alonso's bitter in-house feud at McLaren allowed Kimi in to steal the title. Hamilton binning the McLaren in the gravel in China certainly helped Kimi's cause.