McLaren left Melbourne with a warning signal: about 50 seconds behind Mercedes, partly due to a second pit stop, but mostly because of a deficit in hybrid management, weight distribution, and downforce. The Woking-based team lacks the technical knowledge of the Silver Arrows, interpreting gear ratios and energy strategies differently than Mercedes.
It’s difficult to talk about major losers after the season opener in Melbourne, but if one had to pick a top-tier team, it would probably be McLaren. Just a year ago, the team celebrated beating the very squad that built that Power Unit, on equal hardware. Yet in a few months, the scenario has changed – and not just because of the Power Unit itself.
The fifty-second gap to Mercedes at the Melbourne finish is substantial, raising questions about the origins of such a wide performance difference. The reality is there isn’t a single cause; it’s the result of several intertwined factors. Twelve months ago, the MCL39 was dominant in aerodynamics and ride-height management, but today the picture looks very different.
Surprised by Mercedes’ hybrid management
McLaren admitted being surprised not just by the final gap but by how Mercedes interpreted hybrid energy deployment in a completely different way – which this year carries greater weight in performance. After all, this is one of the advantages of being a constructor: developing your Power Unit in-house.
Mercedes’ wealth of experience
Having worked on these units for years, Mercedes has developed both software and usage models, tested across different track characteristics. Naturally, this has created an added knowledge base – especially at the start of a new technical cycle – which Mercedes is not obliged to fully share with customer teams.
This mirrors the dynamic seen in Formula E: manufacturers provide the base software and tools, but it’s up to customer teams to optimize and exploit them according to the characteristics of their own car. The same was true in the previous technical cycle, but today, optimizing Power Unit performance is both more important and more complex.
With a battery that charges and discharges cyclically, the difference is no longer just peak power, but also where and how it is deployed, and when it’s more advantageous to recharge using super-clipping and lift-and-coast strategies. Mismanaging these parameters can cost several tenths per lap. As James Vowles, Williams’ Technical Director, said, “what Mercedes is doing with the Power Unit caught us a little by surprise.”
This sentiment is shared by McLaren’s Technical Director Andrea Stella, who likely would have preferred broader data sharing but remains aware of the current deficit. “We were a bit surprised by the differences we see in the data between our car’s speed and that of other cars using the same Power Unit. It’s clear we need to do a better job understanding how to exploit the Power Unit, considering the complexities introduced by the 2026 regulations.”
MCL40 struggles on the straights
Throughout the Australian weekend, McLaren was noticeably less effective on the straights, with qualifying laps showing up to 10 km/h slower in the stretch leading to turn 9. This is a significant gap, worth roughly four-tenths of a second in that section alone. More critically, across all other straights, the MCL40 could not compete with the W17.
Before Australia, Mercedes customer teams suggested they were not on the latest spec, but in Melbourne hardware and software were identical – as required by regulations – giving customer teams access to the same tools as the constructor, assuming no reliability issues arise. Beyond this, teams can still work on certain parameters independently, developing their own Power Unit usage models via dedicated software.
McLaren interprets elements differently
It’s not just about unlocking new maps; McLaren employs hybrid management in a way completely different from Mercedes, and this isn’t the only divergence. For example, the Woking team uses noticeably shorter gear ratios than the Silver Arrows, a choice that affects Power Unit operation.
In Melbourne, McLaren engaged eighth gear earlier than rivals, even where competitors remained in seventh. Beyond the shorter ratios, this meant the MCL40 traversed some sectors in higher gears at lower engine revs than others, changing how the Power Unit is used.
It’s no surprise that Andrea Stella emphasized this as the first real occasion where McLaren, as a customer team, felt distinctly behind the constructor on Power Unit performance. This feeling is amplified by the fact that designing an energy usage strategy is now far more complex than in the past, when energy management had less influence.
Downforce and weight remain critical
On the other hand, Mercedes’ advantage – as discussed in another analysis – is not solely due to the Power Unit but also to other factors, beginning with aerodynamic downforce. The W17 benefits from a strong chassis, allowing higher cornering speeds and complementing its hybrid strategy.
“The performance gap comes from two main areas: one is Power Unit exploitation, the other is more grip through corners – we are lacking downforce. So, there’s definitely work to be done. At the same time, when we analyze GPS overlays, we see Mercedes is faster in some corners. So, as I said, our objectives and priorities are very clear,” Stella added.
It’s clear everything cascades: improving in one area allows efficiency gains in another. Yet there are two connected issues: the MCL40 is currently overweight (on which work is ongoing, as Stella indicated, making it a priority), and there’s also a downforce deficit. Both factors reduce grip for the drivers, resulting in significant tire graining during the race. All of these elements together suggest there’s still plenty of room for performance improvement – but the question remains: how quickly can McLaren close the gap?
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