Formula One’s governing body has formally updated the regulatory framework surrounding the Additional Development and Upgrade Opportunities (ADUO) system, confirming revised evaluation dates and unveiling a new support mechanism aimed at manufacturers facing the steepest performance deficits.
The amendments, approved by the FIA World Motor Sport Council, were triggered by two converging factors: the early‑season cancellation of the Bahrain and Saudi Arabian Grands Prix, and the need to provide additional assistance to power unit suppliers whose 2026 projects are currently more than ten percent down on the benchmark.
The ADUO system, introduced for the 2026–2030 power unit cycle, is designed to monitor performance gaps between manufacturers and allocate extra development freedoms to those falling behind.
Its structure relies on three evaluation windows spread across the season, with the FIA issuing formal assessments based on the ICE Performance Index, the metric used to quantify combustion‑engine competitiveness relative to the class leader.
Originally, these assessments were scheduled after rounds six, twelve and eighteen of the 24‑race calendar. But the loss of the opening two events forced a recalibration of the timeline and created uncertainty over how the ADUO periods would be interpreted.
That ambiguity has now been resolved. The revised wording of Article 4.2 of Appendix C5 confirms that the first ADUO period will cover rounds one through five, meaning the initial FIA communication will be issued after the Canadian Grand Prix on 24 May.
The second evaluation will now 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 and will still be published after the Mexican Grand Prix on 1 November. With these adjustments, teams and manufacturers regain the clarity required to plan their development strategies around the updated checkpoints.
What are the further changes?
However, the FIA’s amendments extend beyond scheduling. The governing body has also introduced a new performance threshold designed to support manufacturers whose internal combustion engines are significantly off the pace.
Under the updated rules, any supplier operating with a power deficit greater than ten percent compared to the benchmark will receive an additional 230 hours of dyno testing, a substantial increase intended to accelerate recovery for the most disadvantaged projects.
Although the FIA does not name specific manufacturers, the paddock consensus is that this provision is particularly relevant to Honda, widely believed to be facing the steepest challenges in the early phase of the 2026 engine cycle.
The revised framework also expands the financial concessions available under ADUO. Manufacturers more than ten percent down will gain an extra 11 million dollars in development budget, while those between eight and ten percent behind will receive an additional 8 million dollars.
These measures reinforce the FIA’s determination to prevent excessive divergence in engine performance during a regulatory era defined by a radically different power unit concept, with its 50/50 split between electric and combustion output and far stricter energy‑management constraints.
