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FIA’s Controversial ADUO Engine Ruling Set to Stay Firm
Highlights
- FIA to explain Red Bull’s top engine ranking in ADUO system
- Red Bull’s data suggests Mercedes may have superior engine power
- FIA review affirms Red Bull’s engine 2% ahead of Mercedes
- Final ADUO announcement expected before Belgian Grand Prix next month
- Ferrari and Audi have already introduced performance upgrades this season
- Red Bull’s upgrade chances depend on Mercedes’ future engine improvements
The FIA will brief Red Bull on why its engine leads F1’s ADUO ranking, with the verdict expected to stand before final confirmation ahead of the Belgian Grand Prix.
Red Bull has questioned the methodology, arguing Mercedes shows stronger power in team data from early races, highlighting ADUO’s focus on the internal combustion engine rather than hybrid deployment.
In response, the FIA re-examined data up to the Canadian Grand Prix, with sources indicating no change likely after teams received signed notices during Monaco.
The ruling places Red Bull’s internal combustion engine roughly two percent ahead of Mercedes, a position that restricts its eligibility for immediate upgrade opportunities under ADUO.
FIA data puts Red Bull’s internal combustion engine about 2% ahead of Mercedes.
The governing body plans to share extensive justification with Red Bull, while protecting rival data under confidentiality agreements outlined during the initial ADUO review conducted earlier this month.
A formal update is targeted before Spa, with further clarification expected after recent FIA-Red Bull discussions about how the ranking is derived.
Final ADUO announcement is planned before the Belgian Grand Prix.
Elsewhere, Ferrari deployed its first ADUO step in Austria, Audi added drivability tweaks in Barcelona, and Honda targets an opportunity around the summer break, possibly at Spa.
Red Bull’s path to upgrades depends on relative order in the second review window, which spans Monaco through Hungary and monitors internal combustion gains.
If Mercedes advances its ICE performance, the hierarchy could change, potentially giving Red Bull access to development slots currently unavailable to the top-ranked manufacturer.
If Mercedes focuses elsewhere, Red Bull could remain locked out of ICE upgrades.
Should Mercedes prioritise other power unit elements, Red Bull may stay top and remain locked out of ICE changes for an extended period.
The gap between on-track impressions and the FIA’s result reflects ADUO’s narrow scope, which assesses ICE output separately from battery and recovery deployment, a point raised in recent critiques of the ADUO evaluation.
That methodology sits within the wider regulatory framework, alongside ongoing FIA rule changes that influence how performance is equalised and policed.
Visual Summary
FIA: Red Bull’s Engine Ranked Fastest
?
Red Bull
+2%
FIA’s No.1
⭐️
Mercedes
Base
?
Red Bull blocked from ICE upgrades (for now)
Red Bull blocked from ICE upgrades (for now)
?
Ferrari: Used ADUO upgrade ?? Austrian GP
?
Audi: Drivability update ?? Barcelona
?
Honda: Summer upgrade expected ?? Belgium?
Red Bull’s upgrade fate now depends on whether Mercedes powers up for the next ADUO review.
Despite Red Bull’s protest, the FIA maintains their engine leads by 2%—for now.
Full data explanations are coming, but upgrade doors stay shut unless Mercedes overtakes.
ADUO drama could decide F1’s engine power race in 2026…
Full data explanations are coming, but upgrade doors stay shut unless Mercedes overtakes.
ADUO drama could decide F1’s engine power race in 2026…
Daniel Miller reports on Formula 1 Grand Prix weekends with race-day analysis, team-radio highlights, and point-standings updates. He explains power-unit upgrades, aerodynamic developments, and driver rivalries in straightforward, SEO-friendly language for a global F1 audience.
