McLaren's Stella Urges Delay in F1 Engine Tweaks to 2028 to Address Power Unit Imbalance

Andrea Stella, McLaren team principal, has urged Formula 1 bosses to delay planned power unit hardware changes until 2028, arguing that the current timeline for 2027 is too tight to implement modifications that could address a fundamental performance imbalance.

Why it matters:

The 2026 regulation overhaul introduced a 50-50 split between internal combustion and electrical power, but teams have discovered that the aggressive depletion of battery energy leads to significant performance drops. Stella believes that increasing fuel flow and battery capacity could solve this, but the power unit manufacturers need more time to redesign hardware.

The details:

• Stella proposes raising the electrical harvesting limit from 350 kW to 400-450 kW and increasing fuel flow to the ICE to boost overall power.
• This would require larger batteries and engine architecture changes, which cannot be completed by 2027 given current lead times.
• The pre-Miami rule tweaks already allowed super-clipping to 350 kW, but Stella argues that further adjustments are needed for a lasting solution.
• He urges a decision before the summer break to enable a 2028 implementation, emphasizing that the conversation must conclude soon.

What's next:

The FIA and teams will need to balance the desire for more exciting racing with the practical constraints of development. If Stella's proposal gains traction, it could reshape the technical direction of F1's new power unit era, but any delay risks disrupting the carefully planned introduction of new manufacturers like Audi and Cadillac.