I must admit to a feeling of quiet satisfaction whilst watching the Australian Grand Prix. From the Friday practice data, Ferrari and Lotus looked to be at least as fast as the Red Bull over a race stint, and the Lotus looked good on its tyres. So I was looking to see what the Ferraris and Lotuses were doing when we got to about lap four. And sure enough they started catching the Red Bull in front. By the time Kimi went long in the second stint, the die was cast – there was only going to be one winner.
The difficulty with the Friday data is that you don’t know the fuel loads exactly, and there are times when a team is much faster (or much slower) in the race. However, after doing the analysis for the Spanish Grand Prix last year and (wrongly) assuming that the fastest car (Maldonado) must have been running light, I did a little work to check how well the Friday times stack up against race pace. And it suggested that there are occasionally significant differences (for example Red Bull did run heavy on the Friday in Korea), but in general the Friday pace is a very good indicator of the Sunday race pace. I didn’t want to miss another Maldonado, and although Raikkonen was less of a shock, it looks like most people talked themselves out of suggesting that Lotus might win even with their fast Friday pace. I decided that I wasn’t going to do that.
And so, on to Sunday, where there were some things which were quite different from last year and from practice. First, the degradation in the race was much closer to the degradation in the race last year (with the exception of the ‘graining phase’) then the degradation seen in Free Practice. Secondly, the race pace was slower (just) than last year, despite the indications (not definite as FP3 and qualifying itself were damp) being that the qualifying pace is faster, which must be all to do with the new Pirelli tyres – and the fact that the ‘golden lap’ is very significant.
What I will do in this post is to highlight a few features of the race using the race history charts (which I will try to make clearer…). I will follow-up with a post giving the underlying pace for each car on each tyre type.
From the opening 20 laps of the race, we can see a few interesting pointers on the way the cars use the tyres. The chart below shows the progress of the first five finishers (plus Sutil) during the opening laps. Each line represents a car – cars ahead appear above cars behind, and the steeper the line, the faster the car is going.
The first thing to note is that Vettel’s pace on new tyres is fast for both his stints. This confirms that in terms of pure pace, the Red Bull is the fastest car, but this is not the case over a stint.The change in gradient in Vettel’s curve shows that he has used the best of his tyres by lap 3, and then he settles to a new pace – which is what I curve fit for the stint pace. My understanding is that this slower pace is caused by the tyres graining (balls of rubber forming on the surface as the tyre slides across the track). This effect is also seen in the data from the other cars, and caused the initial pitstops.
The Mercedes cars lasted longer into the stint before they saw the pace drop-off, but they kept going through this phase (Hamilton coping much better than Rosberg) and were rewarded as the tyres cleaned up and showed good pace again. Very interesting is the fact that the impact on Raikkonen was very small – Lotus clearly have a car which is good on tyres, and this seems to be more effective the softer the tyres.
Sticking with the first four cars, the chart below shows the way the race panned out.
Once the cars had made the first stops, it only took a few laps to come across Adrian Sutil going long on the harder tyres. This slowed the pace, and showed Raikkonen’s hand. He easily has the pace to catch the cars ahead, but he sat back until Sutil had stopped. Then he showed his real pace (which is roughly the same as the Ferrari/Red Bull pace – although he may have had some in hand) on the harder tyre – the difference being that he could keep the tyres alive much longer. Once he was on two stops, he was clear to win.
Key to Alonso beating Vettel was his pace at the end of the third stint. Not only had he successfully undercut Vettel at the beginning of the stint, but after having looked after his tyres well at the start of the stint (the undercut is powerful enough to tyre preserve and gain places), he was then able to unleash pace at the end of the stint – Vettel tried to go with him, but didn’t have the tyres left.
And one last thing from this chart. Alonso ahead of Massa – Ferrari favouritism, better strategy, pace? Well, without the strategy, Alonso may well not have passed Massa, but once past, there is no question that Alonso was the quicker Ferrari driver in the race. The curve fits are quite conclusive.
So what to make of it all? Let’s hope that the performance of the tyres continues to play a role in the races, because at the moment we have an ideal situation where the pecking order on pure pace is Red Bull, Ferrari, (Mercedes), Lotus and the race pace order is Lotus, Ferrari, Red Bull. Could make for some fun races.
aaaaaaaa
March 18, 2013
good job on predictions, bookmarking and will check again this friday!
Ricardo
March 18, 2013
The big mistake by FM/Ferrari was the second lap they took after SV pitted, from there on all was lost.
intelligentf1
March 18, 2013
I don’t think that was key – Vettel would still have come out ahead. If they has pitted Massa the lap after Alonso, they would have got ahead of Vettel. However, Vettel was faster than Massa, so he might not have stayed there…
Ricardo
March 18, 2013
I’d put that in a 50/50 basis… We will never know 😉
Magicabe
March 20, 2013
Vettel (and Sutil) pitted one lap after Alonso, do you think they had such advantage on pit stop that they had cleared both?
intelligentf1
March 20, 2013
This is all undercut. The new Pirellis have two fast laps, then settle to a slower pace, as far as I can make out from the laptimes. So the undercut on new tyres is very powerful. I think that this was worth about 2s.
Magicabe
March 20, 2013
There wasn’t any lap to do that undercut. Alonso pitted on lap 20, Vettel and Sutil on lap 21.
intelligentf1
March 20, 2013
So on lap 21 Alonso was on new tyres, Vettel/Sutil on old. The difference is around 2s – can’t be exact as they are in/out laps, but I think that is an undercut.
Magicabe
March 20, 2013
Yeah, I was talking of Massa’s pit stop options. Ferrari had one shot to do undercut and gave it to Alonso. When Sutil and Vettel tried to cover that, Massa didn’t had any other option left then stay out on track. I can see why Massa think his 2nd place was robbed there.
Seems like Ferrari didn’t even had “plan B” for two stop race. Would have been obvious choice to take, splitting strategies and trying to cover and slow down Kimi.
intelligentf1
March 20, 2013
OK, I understand. I think that Ferrari would have expected Massa’s pace in clear air (after Vettel/Sutil pitted) to be faster than it was. He was hardly faster than Sutil had been on the first lap – but better on the second. They tried to stop Massa early for the next stint – but he was too far behind as Vettel passed Sutil, and he didn’t and his shot at the undercut failed.
Alonso’s third stint does make it look like they had a chance at a two-stop, but we can’t be sure.
Knuckles
March 18, 2013
Thanks again, and congratulations for the accurate Friday prediction. Are you planning to have a look at the slower cars in Melbourne as well? Perez seemed to have decent pace in the second half of the race. Was this just because he had pitted later, or was that genuine pace because the car found its window or whatever?
intelligentf1
March 18, 2013
Team-by-team underlying pace analysis is on its way…
Perez was OK in second half – faster than Button – but McLaren were not fast.
john from CA
March 18, 2013
Looks like this year the strategies are going to more spread out. 2 stopper cars like Sutil slow down 3+ stoppers; hopefully it keeps Vettel from pole position to checkered flag. If you wear out options in quali to get front row pitting earlier and getting stuck in traffic. Might keep some teams from running in q3.
john from CA
March 18, 2013
Oh yes, great read too.
intelligentf1
March 18, 2013
I was surprised that no-one (especially Button) went for primes in Q3. Seemed an obvious call for those looking at being places 8-10.
Surely we’ll see it if the options are struggling in Malaysia.
Magicabe
March 20, 2013
Starting on primes gave also “rain card”, if it had started to rain you dont have to run options at all. And you can take longer shot on this using primes on 2nd stint, witch Perez didn’t took.
intelligentf1
March 20, 2013
Can’t figure why Perez went onto options at the first stop. It meant another quick stop and dropped him into traffic.
In fact, having put this scenario into the model, prime-prime-prime-option could have seen Perez finish right behind the Force Indias based on the pace he showed. He would have had to pass Di Resta on track to make it work, though – otherwise he would be back in 11th…
Brian
March 18, 2013
Just found your site last week, great work, will be visiting regularly.
MelB
March 18, 2013
Thank you! Very interesting and insightful reading!
J-Dubya
March 19, 2013
Strong work.
HUI Chung yYing
March 19, 2013
Thumbs up! Very glad to have found this blog!
RichL
March 20, 2013
Great site – wish I had discovered it sooner! Can you explain why the shape of the 2 graphs above is different for the laps and cars that they have in common (i.e. top 4 cars for first 20 laps)? Are they normalized to a different reference lap?
intelligentf1
March 20, 2013
Exactly. In order to show as much detail as possible, I adjust the normalisation for each plot – I can adjust the normalisation to any lap for any driver (and I can remove the effects of safety cars too).