All you need to know about the revised FIA ADUO framework

The FIA has formally updated the regulatory framework governing the Additional Development and Upgrade Opportunities system — better known as ADUO — confirming revised evaluation dates for the 2026 season and introducing a new support mechanism for power unit suppliers facing the most severe performance deficits.

A System Built for the New Power Unit Era

The ADUO system was introduced for the 2026–2030 power unit cycle and is designed to monitor performance gaps between manufacturers, allocating additional development freedoms to those falling behind. Its architecture relies on three formal evaluation windows distributed across the season, with the FIA issuing assessments based on the ICE Performance Index — the metric used to quantify combustion-engine competitiveness relative to the class leader.

The cancellation of the Middle Eastern races had already prompted significant logistical and commercial discussion across the paddock — and its impact on the ADUO regulatory structure has now been formally resolved.

Revised Checkpoints Across the Season

The updated wording of Article 4.2 of Appendix C5 provides long-awaited clarity. The first ADUO period will now cover rounds one through five, with the initial FIA communication to be issued after the Canadian Grand Prix on 24 May.

The second evaluation has been moved forward to follow round eleven, shifting the next assessment to the Hungarian Grand Prix on 26 July, rather than the originally planned Dutch Grand Prix in late August. The third and final review remains unchanged, still set to be published after the Mexican Grand Prix on 1 November.

With these adjustments confirmed, teams and manufacturers can now plan their development strategies around defined, unambiguous checkpoints — a significant practical benefit in a season already disrupted by calendar upheaval.

New Threshold and Extra Resources for the Most Disadvantaged

Beyond scheduling, the FIA's amendments carry substantial sporting weight. The governing body has introduced a new performance threshold targeting manufacturers whose internal combustion engines fall more than ten percent short of the benchmark.

Any supplier meeting that criterion will receive an additional 230 hours of dyno testing — a significant allocation designed to accelerate recovery for the most disadvantaged projects in the field. As detailed in the FIA's approved engine rule changes, the wider package of support measures has been specifically structured to prevent any manufacturer from falling irretrievably behind during this critical early phase of the new regulatory cycle.

The revised framework also expands the financial concessions available under ADUO. Manufacturers more than ten percent down on the benchmark will gain an additional $11 million in development budget, while those operating between eight and ten percent behind will receive an extra $8 million.

Although the FIA does not name specific manufacturers in the amended regulations, the paddock consensus is clear: this provision is widely understood to be particularly relevant to Honda, broadly believed to be facing the steepest challenges of any supplier in the opening phase of the 2026 engine cycle.

Protecting Competitive Balance in a Radical Regulatory Cycle

The measures collectively reinforce the FIA's determination to prevent excessive performance divergence during what is arguably the most technically demanding regulatory transition in recent Formula 1 history. The 2026 power unit concept — defined by its 50/50 split between electric and combustion output and far stricter energy-management constraints — has already demonstrated its capacity to produce wide performance gaps between manufacturers.

By tightening the ADUO calendar around the revised race schedule and introducing a new layer of targeted support for the most disadvantaged suppliers, the governing body is sending a clear signal: competitive convergence is not merely a desired outcome, but an actively managed priority.