High-Altitude Struggles Trigger Double DNF in Mexico
The punishing environment of the Autodromo Hermanos Rodriguez, sitting 2,286 metres above sea level, posed catastrophic reliability challenges for Honda and Aston Martin during the Mexico Grand Prix weekend. Leading into the event, technical personnel were already wary of extreme turbo lag—a lingering symptom from Singapore—alongside cooling hurdles. However, the operational reality proved far harsher for drivers Fernando Alonso and Lance Stroll.
After Alonso was forced to retire his car in the Foro Sol section during qualifying, race day brought zero relief. Both Aston Martin entries were officially parked after completing just five laps on Sunday afternoon. The team initially cited “abnormal pressure levels in the PU systems,” highlighting the critical vulnerabilities exposed by the thin atmosphere in Mexico City.
Honda Explains MGU-K and ERS Cooling Faults
Speaking during media sessions ahead of the upcoming Sao Paulo Grand Prix, the concluding round of Formula 1’s American triple-header, Honda’s chief engineer Shintaro Orihara broke down the mechanics behind the operational breakdown.
“I can’t explain it in too much detail, but I can give you some ideas. In the race, we have the laps to the grid, that is a kind of unique point. And also in qualifying, we have a tyre preparation lap. We have the same laps in practice, but always in different situations.
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“So in those special circumstances our engine behaved a little bit abnormal, not as expected. We got some stress on our ERS cooling from the engine, and then we got some failure on our MGU-K that happened in qualifying and during the race in these special circumstances”, Orihara explained.
“That’s because of the high-altitude condition in Mexico. Here in Brazil, it’s not the same as in Mexico, but still high altitude. So we are bringing some countermeasures for this event, not only on the hardware side, but also on the software side to improve our robustness in that condition.”
Aston Martin’s Pre-Race Resignation
Aston Martin’s chief trackside engineer Mike Krack provided further context, revealing that the team was already braced for an unavoidable failure long before the race lights went out.
“Yeah, we knew that a bit earlier than Sunday morning.”
Despite being fully aware of the impending mechanical crisis, the engineering collective attempted multiple mitigation strategies to keep the cars moving on track for as long as possible.
“I think you need to be realistic when you prepare, you need to discuss what are the possibilities that you have in the race. There are not many, but there are still a few, so we discussed together what the different levels of escalation could be”, Krack said.
“The first one is obviously free air, but then you also have gear usage, you can also turn the power down, there are many options that you have to discuss. We have discussed those thing, but we didn’t get that far”, Krack said, referencing the five-lap stint of both cars. “You have a list of options that you can pull, but we quickly realised that they were insufficient, and then there is nothing you can do.”
Why This Matters
The severe setbacks encountered in Mexico highlight the sensitive operating thresholds of modern hybrid power units when subjected to non-standard atmospheric conditions. While the Autodromo Jose Carlos Pace in Interlagos also features elevated terrain, it does not reach the punishing extremes of Mexico City. Nonetheless, the rapid deployment of hardware modifications and software calibrations is vital for Aston Martin to prevent further retirements as they contest the remaining rounds of the championship.
Looking further down the road, the issues in Mexico serve as a key technical reference point. Honda is working tirelessly to refine component durability across all operational envelopes, balancing current-generation fixes with its future engine platforms.
“That was a hard race for Honda’s side, so I understand how frustrated that event was for the drivers. The learning point is that our engine, in special circumstances, there’s some lack of robustness”, Orihara admitted.
“So we can always learn something from that type of problem and we bring these learnings back to the factory, to see how we can prevent those things from happening again in the future.
“At this moment our factory is focusing on the 2027 power unit, so we can apply this experience to improve our robustness of next year’s engine. That was a tough race for us, but we bring those experiences into next year’s engine.”
Frequently Asked Questions
What specific component failures caused Aston Martin’s retirements in Mexico?
High ambient altitude strained the internal cooling for the Energy Recovery System (ERS), which subsequently triggered MGU-K failures during low-speed tyre preparation laps and formation laps.
Did Aston Martin attempt to manage the issue during the race?
Yes. Aston Martin and Honda explored managing clean air, altering gear usage, and reducing overall engine power outputs. However, the countermeasures were insufficient to prevent total failure within the opening five laps.
How is Honda addressing the problem for the Sao Paulo Grand Prix?
Honda has introduced a blend of hardware and software countermeasures tailored for the elevated conditions in Brazil to bolster engine reliability and avoid repeat failures.
