Pirelli: Red Bull and Aston Martin were running with lower pressures

Red Bull and Aston Martin were running with lower pressures than expected in Formula 1’s Azerbaijan Grand Prix, Pirelli said on Thursday, but did not break any rules.

Pirelli: Red Bull and Aston Martin were running with lower pressures

While F1’s tyre supplier had previously been cryptic in suggesting in a statement that ‘running conditions’ had been behind the tyre failures suffered by Max Verstappen and Lance Stroll in Baku, it has now elaborated further on what triggered the blowouts.

And while Pirelli confirmed that both Red Bull and Aston Martin had followed the regulations with the minimum starting pressures and maximum blanket temperatures, it says that things deviated from what it expected once the cars were running.

Pirelli normally sets a starting pressure based on an expectation that the pressure will then raise further once the tyres are running out on track.

However, it appears that the tyres on Aston Martin and Red Bull did not experience such a raise in pressure in Baku and were therefore running at a lower level than Pirelli anticipated.

By running below the pressure that Pirelli expected, it meant the standing waves being caused by the high speed Baku corners were enough to trigger the failure on the inside shoulders of Verstappen and Stroll’s left rear tyres.

Read Also:

Speaking to media at the French Grand Prix, Pirelli's head of F1 and car racing Mario Isola confirmed that both teams were running with tyres outside of what Pirelli had expected.

“What happened in Baku is simply that the running conditions expected were different compared to the actual running conditions - and that created the failure,” he said.

“When you have a lot of energy going into the tyres, with the pressure that is lower compared to the expectation, the result is that on the sidewall you have what we call standing waves.

“Standing waves are putting a lot of energy into the inside shoulder of the tyre. And at a certain point, the tyre breaks. That is what happened, and the reason why we had this situation in in Baku.”

Isola said that the issue was not totally down to the tyre pressures at those two teams being below what was expected.

Another contributing factor was that Pirelli’s predictions for car performance over the weekend, based on data that teams had supplied, were not in line with how they really fared out on track.

“When we prepare the prescriptions [for minimum pressure], we receive the simulations and we consider margins,” he said. “The expected loads, the downforce or the speed, are simulated, so it is not exactly the value that we find on track. And in this case in Baku, we also found some parameters that were not exactly what we found on track.”

He added: “We assume that they are running at a certain pressure, and a certain camber. And with a margin on it, of course, we run in a condition that is okay for the tyre.

“In that case, we didn't achieve these conditions, not because teams were doing something against the regulations, but because they were looking as usual for performance, and that created a different scenario to what we were expecting. And the different scenario was that mainly the tyres were running at a lower pressure compared to expectation.”

Lance Stroll, Aston Martin AMR21

Lance Stroll, Aston Martin AMR21

Photo by: Zak Mauger / Motorsport Images

Isola said that the teams had not done anything against the regulations because there is no minimum running pressure that needs to be adhered to.

However, that is changing for next year when teams must run with a standard pressure sensor as part of F1’s new rules era.

“If the regulation is not written that there is a running pressure that you have to respect, I cannot say that they were doing something against the regulation in their search of more performance," continued Isola.

“If they respect the starting pressure, they are complying with the regulation. If the same happens next year when we, with the standard sensor, impose a running pressure, in that case they are against the regulations. But this is not the case this year.”

Isola said it was not really a surprise that teams were pushing the margins on tyre pressures, as he suggested the spread between teams on running pressures in Baku was more than one Psi.

“Each team is looking for performance,” he said. “They are here racing, they are not here just to cruise on track. And that means that, looking for performance, we know that if you go with a bit lower pressure, you get some performance."

Although there have been suspicions about teams playing around with pressures in recent races, Isola said Baku was the first time that it had been picked up in such a way.

“We check every time the running parameters when we receive the telemetry data from the race," he said. "We check everything on all the teams, of course, and also because it's an indication for the following race and its prescription, so we use the data. “

shares
comments

Related video

Perez: O’Ward can race the very best drivers in the world
Previous article

Perez: O’Ward can race the very best drivers in the world

Next article

Juan Manuel Correa returns to Sauber young driver academy

Juan Manuel Correa returns to Sauber young driver academy
Load comments
What Ferrari still needs to improve to return to F1 title contention Prime

What Ferrari still needs to improve to return to F1 title contention

After a disastrous 2020 in which it slumped to sixth in the F1 constructors' standings, Ferrari has rebounded strongly and is on course to finish third - despite regulations that forced it to carryover much of its forgettable SF1000 machine. Yet while it can be pleased with its improvement, there are still steps it must make if 2022 is to yield a return to winning ways

How F1 teams and personnel react in pressurised situations Prime

How F1 teams and personnel react in pressurised situations

OPINION: The pressure is firmly on Red Bull and Mercedes as Formula 1 2021 embarks on its final double-header. How the respective teams deal with that will be a crucial factor in deciding the outcome of the drivers' and constructors' championships, as Motorsport.com's technical consultant and ex-McLaren F1 engineer Tim Wright explains.

How getting sacked from Benetton made Mercedes' Allison Prime

How getting sacked from Benetton made Mercedes' Allison

He’s had a hand in world championship-winning Formula 1 cars for Benetton, Renault and Mercedes, and was also a cog in the Schumacher-Ferrari axis. Having recently ‘moved upstairs’ as Mercedes chief technical officer, James Allison tells Stuart Codling about his career path and why being axed by Benetton was one of the best things that ever happened to him.

Formula 1
Nov 28, 2021
The remarkable qualities that propelled Kubica’s F1 comeback Prime

The remarkable qualities that propelled Kubica’s F1 comeback

It’s easy to look at Robert Kubica’s second Formula 1 career and feel a sense of sadness that he didn’t reach the heights for which he seemed destined. But as Ben Anderson discovered, performance and results are almost meaningless in this context – something more fundamental and incredible happened…

Formula 1
Nov 27, 2021
The humbling changes Ricciardo made to deliver for McLaren Prime

The humbling changes Ricciardo made to deliver for McLaren

From being lapped by his own teammate in Monaco to winning at Monza, it’s been a tumultuous first season at McLaren for Daniel Ricciardo. But, as he tells STUART CODLING, there’s more to the story of his turnaround than having a lovely summer holiday during Formula 1's summer break...

Formula 1
Nov 26, 2021
The potential benefits of losing the F1 constructors' title Prime

The potential benefits of losing the F1 constructors' title

As the battle continues to rage over the F1 2021 drivers' championship, teams up and down the grid are turning their attentions to the prize money attributed to each position in the constructors' standings. But F1's sliding scale rules governing wind tunnel and CFD use will soften the blow for those who miss out on the top places

Formula 1
Nov 25, 2021
The invisible enemy that's made Hamilton's title charge tougher Prime

The invisible enemy that's made Hamilton's title charge tougher

After winning his past few Formula 1 titles as a canter, Lewis Hamilton currently trails Max Verstappen by eight points heading into the final double-header of 2021. Although Red Bull has been his biggest on-track challenge, Hamilton feels that he has just as much to grapple with away from the circuit

Formula 1
Nov 24, 2021
Why F1's inconvenient penalties have to stay Prime

Why F1's inconvenient penalties have to stay

OPINION: Quibbles over the length of time taken by Formula 1's stewards over decisions are entirely valid. But however inconvenient it is, there can be no questioning the importance of having clearly defined rules that everyone understands and can stick to. Recent events have shown that ambiguity could have big consequences

Formula 1
Nov 23, 2021