Pirelli’s new C6 tyre made its maiden look as a part of the race-weekend at Imola however left everybody, together with the tyre provider itself, baffled when rivals struggled to make it final over a single lap. The 2 Aston Martin drivers and Mercedes’ George Russell set their finest laps in qualifying on the C5, which is the medium tyre choice for the Imola GP.
What’s all of the extra shocking is that after Friday’s two observe periods, the primary significant check of the brand new tender compound, many of the feedback have been constructive.
Pirelli claimed it supplied a noticeable step up in grip from the C5 and the distinction in laptime between the 2 was even larger than its simulations had steered – as much as half a second a lap moderately than 0.2-0.3s.
However this positivity evaporated on Saturday as each group discovered the C6’s efficiency dropped off dramatically over the course of a push lap except it was managed completely.
This was what pushed Mercedes to ship Russell out on the C5 for his last Q3 run, compromising his obtainable tyre choice for the race. It emerged that Aston Martin had already taken the choice to make use of each the C5 and C6 in qualifying on Friday night time.
Talking after qualifying however earlier than all the information had been analysed, Pirelli motorsport supervisor Mario Isola admitted that the explanations for the C6 not working as anticipated weren’t but clear.
Fernando Alonso, Aston Martin Racing
Photograph by: Sam Bagnall / Motorsport Photos by way of Getty Photos
“I consider, and the overall feedback from drivers is that at the moment [Saturday], they skilled extra understeer in contrast with yesterday, and this might clarify the rationale the observe was not faster,” he stated.
“Should you have a look at the lap instances, not a lot faster than yesterday. We had little or no observe evolution, and along with the understeer they stated it was troublesome to extract the efficiency from the C6.
“So, the C6 was tougher to make use of, most likely the preparation lap was troublesome. We can not discover a clear development within the sector instances to say that there was a degradation from sector one to sector three.”
Though the expectation was that the C6 can be as much as half a second faster per lap, when pushed on Saturday it proved to be much less predictable and constant than the C5 – which accounts for why many drivers who tried the medium in FP3 and qualifying have been capable of go quicker than they have been on the tender.
A number of groups additionally noticed that their drivers have been capable of extract a greater lap time from a C6 that had already been used.
Pirelli’s rationalization for this was that the used tyre’s efficiency peak was decrease, however extra predictable and simpler to entry.
Mario Isola, Racing Supervisor, Pirelli Motorsport
Photograph by: Mark Sutton / Motorsport Photos
“If we contemplate that this compound may be very tender and, as typical with a tender compound, you’ve got a curve of grip with a peak that is a little more sharp,” stated Isola.
“Then clearly when you give a warmth cycle to the brand new tyre, you’ve got a barely completely different curve of grip with much less peak, and which means it’s a bit simpler to make use of a tyre like this.”
Much less simply defined was the shift in the direction of understeer. Pirelli had dropped the minimal stress for the rear tyres by one psi in a single day however this in itself wouldn’t be more likely to account for such a change in steadiness.
Typically groups dial in understeer to guard the rear tyres – but when it was a deliberate setup selection it appears counter-intuitive to complain about it.
“It isn’t clear why they have been complaining about this extra understeer in contrast with yesterday as a result of there are not any parts to help this,” stated Isola.
“We did not have any rain in a single day or something unusual, however the observe appeared to be slower in contrast with yesterday – and everybody, generally as a mean, we had this remark of further understeer in contrast with yesterday.
“Yesterday the limitation was the rear, at the moment plainly was extra the entrance.”
Lando Norris, McLaren
Photograph by: Zak Mauger / Motorsport Photos by way of Getty Photos
What makes the change much more puzzling is that the climate situations have been largely constant from each day, although the wind had modified path.
Using completely different engine energy modes for qualifying can also be unlikely to account for the shift, because the C6 was additionally problematic in Saturday’s third observe session.
“We all know that one psi in each instructions, when you improve otherwise you go down, shouldn’t be actually altering the steadiness,” stated Isola.
“It by no means occurred earlier than so I can not think about that. There’s something greater that we have not found but that was going to alter this steadiness.”
Additional evaluation will point out whether or not groups’ setup decisions did have an affect. The size of Imola’s pitlane naturally steers groups in the direction of a one-stop technique as a result of the time loss is within the order of 28 seconds.
Defending the tyres as a lot as potential due to this fact turns into crucial – so it’s potential that, having noticed the rear axle to be a ‘limitation’, groups intentionally dialled in additional understeer to guard the rear tyres. It’s frequent observe however, working with an unfamiliar tyre compound, they might have gotten extra understeer than they anticipated.
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Regardless of this weekend’s stumble, Pirelli intends to push on with its plan to roll out the C6 at extra races and doubtlessly ‘skip’ compounds in its tyre choice – basically constructing in a disincentive to run one-stop methods.
For the reason that whole tyre household is homologated for the 12 months and can’t be modified, that’s the solely possibility on the desk: discover a resolution utilizing the tyres that exist already.
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