The cancellation of two Middle Eastern race weekends has done more than shorten the calendar — it has upended the engine development timeline for several manufacturers hoping to close the gap to Mercedes.
The cancellation of the Saudi Arabian and Bahrain Grands Prix, prompted by the conflict in the Middle East, carries consequences that stretch well beyond the race schedule. While the cap on power unit components is expected to remain unchanged despite the reduction from 24 to 22 races, the disruption has significant implications for a key mechanism in the 2026 regulations: the ADUO system.
ADUO — Additional Development and Upgrade Opportunities — is a framework designed to prevent any single manufacturer from establishing an unchallenged technical advantage over the course of a season. It operates across four evaluation windows per year, each triggered after every sixth race, at which point a specific performance index is used to compare the relative output of each power unit on the grid.
The system was built with the understanding that not all manufacturers will arrive at the start of the 2026 season on equal footing. Any manufacturer found to be more than two percent behind the benchmark power unit is granted access to additional development and upgrade opportunities beyond the standard allowance.
Crucially, the evaluation does not assess peak power output in isolation — it draws on a broader performance index that reflects the overall effectiveness of the unit across a race weekend.
How might the ADUO affect the 2026 F1 World Championship?
Under normal circumstances, each manufacturer is permitted one upgrade per component per year. For those falling short of the two percent threshold, however, the regulations become considerably more permissive. A deficit of between two and four percent unlocks an additional upgrade for both the current and following season.
Should the gap exceed four percent, the number of authorised upgrades doubles. Beyond extra components, disadvantaged manufacturers are also granted increased dyno time and enjoy some relaxation of the cost cap as it applies to power unit development.
The original calendar had the Miami Grand Prix — scheduled for early May — falling as the sixth race of the season, which would have triggered the first ADUO evaluation window. With Saudi Arabia and Bahrain now removed from the schedule, that milestone is pushed back to the Monaco Grand Prix in early June, delaying access to the system for anyone hoping to use it quickly to address a power deficit.
The urgency is most acute for Audi, who have publicly acknowledged a significant gap in their power unit performance and are counting on the ADUO mechanism to accelerate their development trajectory. Ferrari, too, is closely monitoring the opportunities available.
Following the Chinese Grand Prix, principal Frédéric Vasseur was explicit about Ferrari's intention to use ADUO upgrades to close the performance gap — while also acknowledging that narrowing the deficit in engine performance is a far more laborious process than developing the chassis, given the extended lead times required for new power unit components.