The FIA has finally provided official clarification on how the ADUO system will function under Formula 1’s 2026 power unit regulations, putting an end to widespread speculation surrounding what struggling manufacturers will actually be allowed to do if they fall behind. The explanation makes one point particularly clear: no manufacturer, including Ferrari, will be permitted to scrap its original concept and design an entirely new engine from scratch once homologation is complete.
ADUO—short for Additional Development and Upgrade Opportunities—has been introduced as a mechanism designed to support power unit manufacturers that find themselves at a competitive disadvantage during the new regulatory era. However, the FIA’s clarification confirms what many technical observers had already suspected for months: the system is intended to allow targeted development of an existing homologated power unit, not a complete technical reset.
This clarification is especially significant given the recent speculation surrounding Ferrari and reports suggesting the Scuderia’s 2026 power unit may be facing development concerns.
Why the “return to the 2025 engine” theory never made technical sense
Earlier in the season, some reports suggested Ferrari’s difficulties were so significant that the team might need to “go back” to a 2025 engine specification. From a technical perspective, however, that theory always contained major contradictions.
The 2025 and 2026 Formula 1 power unit regulations differ fundamentally in several critical areas, including the overall engine architecture, hybrid management philosophy, total system weight, auxiliary systems, chassis-power unit integration, and—perhaps most importantly—the entirely new approach to electrical energy deployment. The 2026 power unit has been developed through multiple progressive design stages during its engineering lifecycle. If problems emerge, a manufacturer could theoretically revert to an earlier internal version of its 2026 concept, but it could never simply return to an engine built under a completely different rule set.
For that reason, the idea of Ferrari directly reverting to a 2025-spec power unit never had genuine technical credibility.
How the ADUO system will actually work
The FIA will continuously monitor engine competitiveness using several measurable performance indicators. These include delivered torque, engine top speed, MGU-K power output, and the overall lap-time impact generated by the power unit package.
If a manufacturer’s power unit is judged to be at least 2% behind the benchmark engine on the grid, that manufacturer may become eligible for ADUO support. However, the system is not designed as an automatic performance equaliser. As FIA single-seater director Nikolas Tombazis has explained, the goal is to give struggling manufacturers additional development flexibility without artificially manipulating competitiveness.
Financial support tiers under the regulations
The regulations establish several support levels depending on the performance deficit recorded.
A gap between 2% and 4% would allow access to up to $3 million in additional development flexibility. A deficit between 4% and 6% increases that figure to $4.65 million, while a 6% to 8% shortfall would unlock up to $6.35 million.
Manufacturers trailing by 8% to 10% could receive up to $8 million in support, while those more than 10% behind may access up to $11 million, along with further special allowances during the 2026 season.
In practical terms, ADUO functions as a form of partial engine cost cap relief, allowing more dyno hours and greater freedom for technical development.
No new engines allowed
The most important clarification from the FIA concerns the scope of what can actually be changed.
Manufacturers will not be allowed to create an entirely new power unit. Only updates to the already homologated engine package will be permitted.
Those permitted development areas include internal combustion engine components, the turbocharger, exhaust systems, wastegate valves, sensors, the MGU-K, ERS systems, cooling architecture, control electronics, hydraulic systems, and associated fluids. This confirms that the 2026 Formula 1 engine regulations will remain heavily locked down once the original homologation process is completed.
How many upgrades will be allowed?
The FIA has also clarified the maximum number of update opportunities available to struggling manufacturers.
Teams with a performance deficit between 2% and 4% will be permitted one upgrade during the current season and one additional upgrade in the following campaign. Manufacturers falling more than 4% behind will be allowed two upgrades in the current season and two more in the next. These upgrade opportunities will not accumulate over time. If a manufacturer fails to use its allocated development windows within the FIA’s defined timeframe, those opportunities will be permanently lost.
Final analysis
The FIA’s clarification effectively dismantles the theory that Ferrari—or any other manufacturer—could completely rebuild its 2026 engine concept after homologation. The new rules permit evolution, not reinvention, reinforcing a much stricter technical philosophy than in previous Formula 1 eras.
That means the biggest challenge of Formula 1’s next regulatory cycle will be getting the concept right from day one. Under these regulations, there will be far less room for dramatic mid-cycle recovery. Any manufacturer that misjudges its initial concept risks carrying those weaknesses for years.
The FIA’s clear-cut boundaries regarding the ADUO framework therefore completely dismantle the paddock narrative of an emergency engine redesign waiting in the wings at Maranello. By locking down the baseline architecture of the 2026 power units, the governing body is enforcing a rigid technical environment where teams must live or die by their initial engineering choices. In this unforgiving era of Formula 1, the safety net is designed only to soften the blow for those who miss the mark, rather than offering a reset button. Consequently, hitting the ground running from the very first rollout remains the ultimate differentiator, as correcting a fundamental conceptual flaw could now take years of painful, incremental development.
