McLaren admits being 'on the back foot' with Mercedes F1 power unit

McLaren team principal Andrea Stella has openly admitted his team feels "on the back foot" for the first time in its renewed partnership with Mercedes, struggling to extract the same performance from the power unit as the works team. This admission follows a dominant display by Mercedes in Australia, where George Russell took pole by a large margin and led a one-two finish, while McLaren's lead car finished over 50 seconds behind.

Why it matters:

This highlights a significant and potentially widening performance gap between a works team and its customers in F1's current era. For a championship-contending team like McLaren, which won titles as a Mercedes customer in 2024 and 2025, an inability to fully understand and exploit the power unit's potential is a major competitive handicap. It raises questions about the balance of information and technical collaboration in customer-supplier relationships at the pinnacle of motorsport.

The details:

• The performance delta was stark in Melbourne. Mercedes' George Russell secured pole position by 0.862 seconds over McLaren's Oscar Piastri and went on to win dominantly.
• Stella revealed the issue is rooted in a lack of predictive knowledge. Unlike the normal F1 process of simulating and planning, McLaren has been forced to react on-track, describing their approach as: "'Oh, this is what we have. Good. Now let's react to what we have.'"
• Analysis Points to Underperformance: McLaren's technical review, comparing data with Mercedes and other competitors, indicates the team is not fully exploiting the available power unit potential. Stella stated, "it looks like more is available."
• A Knowledge Disparity: Stella acknowledged it is "fair enough" that the works Mercedes team has a more advanced understanding from deeper collaboration. He framed McLaren's situation as being "earlier in its progression" on the necessary learning journey.
• The Path Forward: The team plans to "intensify the collaboration" with Mercedes High Performance Powertrains (HPP) to access this perceived "low-hanging fruit." A key task is determining if the shortfall is due to controllable parameters or more systemic factors limited to customer teams.

What's next:

McLaren's immediate focus is on closing this knowledge gap through enhanced collaboration with HPP. The team's ability to quickly learn and adapt will be critical to maintaining its position at the front of the grid.

• The coming races will serve as a test of whether this intensified technical dialogue can translate into tangible performance gains on track.
• This situation also puts a spotlight on the other Mercedes customer teams, Alpine and Williams, who are reportedly similarly confounded by the works team's performance, suggesting a broader challenge within the HPP ecosystem.