The ADUO acronym is one of the most significant innovations introduced in Formula 1’s new power unit regulations. Additional Development and Upgrade Opportunities is a mechanism designed to allow manufacturers to upgrade their power units during the current season and the following one. The goal is to accelerate the natural convergence of performance levels between engine suppliers.
There has been extensive discussion about ADUO, both before the start of the season and in recent weeks. At the conclusion of the next race, the Canadian Grand Prix, the FIA’s evaluation process will officially begin for the first time, creating a performance ranking of all engine manufacturers. As is often the case when major regulatory changes are introduced, some aspects are immediately straightforward, while others require closer interpretation.
“It is important to clarify that ADUO is not a Balance of Performance (BOP) system,” explained FIA Single-Seater Director Nikolas Tombazis. “A team or manufacturer will not suddenly receive more fuel or less ballast. This is a cost cap relief mechanism, where a power unit manufacturer that meets the ADUO criteria has the opportunity to develop its engine through reduced financial restrictions. A manufacturer will still need to build the best engine possible in order to win. It is not a magic solution or a bonus; it simply provides additional room to develop the power unit within the limits established by the Technical Regulations.”
One of the first aspects set to attract major attention in the coming weeks will be the calculation of the internal combustion engine performance index. This evaluation is based on several technical parameters, including crankshaft torque, engine rotational speed, and MGU-K power output.
A manufacturer whose ICE performance index is at least 2% lower, but less than 4% behind the best-performing internal combustion engine, will be entitled to one homologation upgrade during the current season and an additional upgrade in the following campaign. Manufacturers with a deficit of 4% or more will instead be eligible for two extra upgrades in the current season and two more in the following championship.
This is combined with specific cost cap relief dedicated to development. Any manufacturer with a performance gap between 2% and 4% will receive up to $3 million in additional spending room. For deficits between 4% and 6%, the allowance increases to up to $4.65 million. Between 6% and 8%, it rises to $6.35 million, while an 8% to 10% shortfall unlocks up to $8 million. Any manufacturer suffering a deficit of 10% or greater will receive up to $11 million for each ADUO period, plus the one-time opportunity—limited to the 2026 season—to bring forward up to $8 million of future cost cap allocation.
The monitoring periods have been revised following changes to the 2026 calendar. The season has now been divided into three evaluation windows. Initially, the first period was expected to cover races one through six, but after the calendar revision it was reduced to the opening five rounds: Melbourne, Shanghai, Suzuka, Miami, and Montreal. Results must be communicated within two weeks of the Canadian Grand Prix. The second evaluation period will cover races six through eleven, from Monaco to Budapest, while the third will run from round twelve at Zandvoort through to the Mexico City Grand Prix.
Once the results are published, eligible power unit manufacturers will receive separate notification with details regarding their specific ADUO allocation, allowing upgrades to be introduced as early as the following race. Any unused upgrade entitlement that remains unclaimed by the final round of the season will be forfeited. For example, if a manufacturer receives one upgrade allocation for 2026 and another for 2027 after the Canadian Grand Prix review, the 2026 upgrade must be used before the end of that season, while the 2027 allocation remains available for the following year.
ADUO upgrades cannot be stacked within the same season and are granted only the first time a manufacturer falls within the FIA’s qualifying thresholds. However, upgrade allocations awarded for the following year can be combined with any additional entitlements gained through later evaluations.
In a scenario where a manufacturer receives two upgrades for 2026 and two for 2027, then qualifies again for ADUO after the first review period of 2027, it could potentially have four upgrades available to introduce during the 2027 Formula 1 season.
Engine manufacturers qualifying for ADUO will be permitted to modify a broad range of components, as outlined in Appendix C4 of the Technical Regulations. Eligible areas include internal combustion engine elements, the exhaust system, turbocharger, wastegate/pop-off valve, electrical components, sensors mounted on the engine and exhaust, the ERS and its associated cooling circuits, the MGU-K, vehicle control electronics, as well as selected hydraulic components and fluids.
This regulatory framework represents the FIA’s most significant effort yet to ensure the 2026 engine era doesn’t become a one-sided affair. By allowing trailing manufacturers to outspend the budget cap specifically for performance recovery, F1 is betting on a faster convergence that will keep the championship battle tight through the end of the decade. All eyes now turn to the data coming out of Montreal to see which manufacturers will be the first to unlock these extra development tokens.
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