F1 Engine Upgrade System: Why Manufacturers Chose Simplicity

F1 power unit manufacturers rejected a more complex system for ranking engine performance last year, opting instead for a simpler horsepower-based metric that will now determine which teams receive crucial development allowances. The FIA's final ranking under the new Additional Development and Upgrade Opportunities (ADUO) system is imminent, setting the stage for a pivotal phase of in-season engine development.

Why it matters:

The ADUO system is designed to help engine manufacturers who are lagging behind catch up, but the method of measuring that deficit is critical. Choosing a simple power output metric over a more holistic assessment of engine installation and design philosophy could significantly impact which teams get extra development tokens and resources, potentially influencing the competitive order.

The details:

• The FIA offered manufacturers a more nuanced evaluation method in early 2025, considering factors like turbo pressures, diameters, and plenum temperatures.
• A Unified Rejection: All power unit manufacturers unanimously rejected the complex proposal, advocating to "keep it simple" with a focus solely on internal combustion engine (ICE) horsepower.
• This decision sidelines contentious design trade-offs, such as Ferrari's choice of a smaller turbo for better driveability or its exhaust wing's impact on back pressure.
• FIA Single Seater Director Nikolas Tombazis confirmed the current metric is appreciated as a straightforward horsepower measurement, a parameter agreed upon from the start.

Between the lines:

The debate highlights a fundamental tension in F1's attempt to balance competition. A simple metric is transparent but may not account for teams who intentionally compromise peak engine power for overall car performance. Red Bull's Laurent Mekies pointed to the "objective complexity" of such an evaluation, noting the difficulty in fairly judging different technical philosophies. Tombazis himself expressed personal openness to a more complicated parameter set, but the manufacturers' collective preference for simplicity prevailed.

What's next:

The FIA is set to announce the engine performance ranking in the coming weeks, triggering the ADUO allowances.

• Tombazis downplayed the system's potential to dramatically shake up the order, clarifying it is not a "balance of performance" tool but rather provides additional development opportunities within the financial and sporting regulations.
• The coming weeks will reveal which manufacturers are deemed behind the benchmark and how they utilize their granted upgrades to close the gap, all under the constraints of the simple power metric they themselves chose.