Technical analysis: the FIA’s exclusive power to fix engine imbalances under ADUO. The FIA’s ADUO system ensures fair competition in Formula 1 from 2026 to 2030.

The International Automobile Federation (FIA) has introduced a new system for the 2026–2030 Formula 1 seasons aimed at improving on-track action and standardizing performance across all constructors.

This system is called ADUO (read more here) and works as follows: power unit performance will be monitored in three periods throughout the year. Based on the collected data, struggling manufacturers will be allowed to access additional homologations relative to the reference engine manufacturer, depending on the performance gap.

Performance gap thresholds and ADUO rights

Manufacturers with a performance deficit between 2% and 4% compared to the ICE performance index will be entitled to:

• One additional homologation in the current year
• One additional homologation in the following year

Manufacturers with a deficit greater than 4% compared to the ICE performance index will be entitled to:

• Two additional homologations in the current year
• Two additional homologations in the following year

The FIA also specifies that ADUO homologation updates are not cumulative within a season and will only be granted following the first assessment where the PU manufacturer is deemed eligible for ADUO (during one of the three designated periods).

FIA clause limiting imbalances for performance convergence

What drew particular attention is a clause introduced by the Federation. The FIA reserves the right to take corrective actions, at its sole discretion, if upgrades implemented under Article 3.3 create a competitive imbalance. Any such actions will be discussed in good faith with all PU manufacturers.

Clarification on Article 3.3

For clarity, Article 3.3 specifies the following: PU manufacturers meeting the optional homologation criteria may implement ADUO upgrades under these conditions:

1. Only components marked with “a” in the “ADUO” column in the table referenced in Appendix C4 may be included.
2. Submission of an updated homologation dossier is required as specified in Article 1.5 of the Appendix.

Furthermore, the power unit updated under the latest ADUO homologation:

1. Must contain only parts included in that updated homologation dossier.
2. Can be introduced from the first race following the ADUO allocation, in addition to any other specification updates otherwise permitted.
3. Will be available to every F1 team customer of the PU manufacturer.

All ADUO updates will be subject to careful FIA oversight. With this clause, the Federation essentially says “yes” to performance uniformity and a clear “no” to competitive imbalances. In such cases, the governing body will monitor the manufacturers themselves, who will take note of the FIA’s concerns and draw the necessary conclusions.

As the 2026 Formula 1 season approaches, the implementation of the ADUO system therefore marks a pivotal moment in the FIA’s ongoing effort to balance high-level engineering with a sustainable, competitive show. By creating a safety net for manufacturers that fall behind, Formula 1 is effectively moving away from the era of “frozen” hierarchies, ensuring that no team is left adrift in a technical vacuum for years at a time. While the ultimate success of these corrective actions remains to be seen on the track, the governing body’s proactive stance signals a clear commitment to a more unified and unpredictable grid. For fans and teams alike, the next few seasons will be a fascinating experiment in regulatory convergence, where the ability to interpret and maximize these unique homologation windows could very well decide the next world champion.