The 2026 Formula 1 season has introduced one of the biggest technical revolutions in the sport’s history, with both chassis regulations and power unit rules undergoing sweeping changes at the same time. With such a dramatic reset, one major concern quickly emerged: what happens if a single engine manufacturer gets it right immediately and dominates for years?
To avoid that scenario and help keep the championship competitive, Formula 1, the FIA, teams, and manufacturers introduced a new mechanism called ADUO — Additional Development and Upgrade Opportunities. The system is designed to give struggling power unit manufacturers a structured path to recover lost performance, both technically and financially, even after engine homologation.
Here is a full breakdown of how the ADUO system works in Formula 1.
1. What is ADUO in Formula 1?
ADUO stands for Additional Development and Upgrade Opportunities. It is a mechanism built into the 2026 Formula 1 technical regulations that allows underperforming engine manufacturers to continue developing their power units after homologation.
Normally, homologation significantly restricts engine development, but ADUO creates specific exceptions designed to help manufacturers that fall behind close the performance gap. The FIA’s stated objective is to preserve competitive balance and prevent a repeat of long-term technical domination by a single supplier.
2. How does the FIA decide who qualifies?
The FIA continuously monitors the internal combustion engine performance of each manufacturer through a dedicated ICE Performance Index. This assessment considers several technical parameters, including crankshaft input torque, engine speed (RPM), and MGU-K power contribution.
If a manufacturer’s engine is measured at least 2% behind the benchmark power unit, that manufacturer becomes eligible for ADUO support.
3. Is ADUO basically a Balance of Performance system?
No. The FIA has been clear that ADUO is not a Balance of Performance system similar to what is used in some endurance racing categories.
As FIA single-seater director Nikolas Tombazis has explained, the governing body will not artificially slow leading manufacturers by altering parameters like fuel flow or limiting outright performance. Instead, ADUO simply gives struggling manufacturers additional development freedom and extra spending allowances. Success still depends entirely on how effectively those manufacturers use those resources.
4. How much extra can manufacturers spend?
The financial support sits outside the normal Formula 1 cost cap and depends on the size of the performance deficit:
- 2%–4% gap: up to $3 million
- 4%–6% gap: up to $4.65 million
- 6%–8% gap: up to $6.35 million
- 8%–10% gap: up to $8 million
- More than 10% gap: up to $11 million, plus (for 2026 only) the option to bring forward an additional $8 million from future budgets
5. When are performance checks carried out?
The 2026 season is divided into three evaluation windows.
The first monitoring phase was originally supposed to cover six races, but due to calendar changes following the cancellation of the Bahrain and Saudi Arabian Grands Prix, it now covers the first five events: Australia, China, Japan, Miami, and Canada.
The FIA will publish the first performance ranking within two weeks of the Canadian Grand Prix. The remaining monitoring windows cover races 6–11 and 12–18 respectively.
6. How many engine upgrades are allowed?
The number of additional upgrades depends on how large the performance gap is.
Manufacturers with a deficit between 2% and 4% receive one additional upgrade for the current season and one for the following year. If the gap exceeds 4%, that increases to two extra upgrades for the current season and two for the next.
Once official approval is granted, those upgrades can be introduced as early as the next race weekend.
7. Can manufacturers save upgrades and use them all later?
Not within the same season if those allowances come from separate evaluations in that same year.
However, if a manufacturer qualifies in consecutive seasons, the bonuses can stack. For example, if a manufacturer earns two bonus upgrades for 2027 based on 2026 performance and then qualifies again in 2027, the total available upgrades for that season could rise to four.
8. What happens if an upgrade is not used?
Unused ADUO upgrades expire.
If an upgrade allocated for the current season is not homologated and introduced before the final race of that championship, it is permanently lost. Teams cannot simply carry unused upgrade opportunities into the following year.
9. Which parts of the power unit can be modified?
Although eligibility is based only on internal combustion engine performance, the permitted upgrade scope is much broader. Manufacturers can modify the ICE itself, exhaust components, the turbocharger, the ERS package (including cooling systems), the MGU-K, control electronics, and even supporting fluids or ballast-related elements. In practice, ADUO offers significant technical flexibility rather than narrowly targeting one component.
10. What if a manufacturer is already competitive?
If an engine manufacturer remains within 2% of the benchmark after the first two evaluation windows, it becomes permanently ineligible for ADUO support for the final monitoring period of that season. This rule ensures the system is reserved for manufacturers facing genuine competitive difficulties, rather than those experiencing only isolated weak weekends.
Why ADUO matters in Formula 1
The ADUO system could become one of the most important competitive balancing tools of Formula 1’s new era. Rather than artificially equalising performance, the FIA has created a mechanism that allows struggling manufacturers a realistic path back into contention without undermining the engineering competition that defines the sport.
With the first official performance assessment due after the Canadian Grand Prix, attention will soon turn to which engine manufacturers may be first to benefit.
The ADUO system therefore strikes a crucial balance in Formula 1’s modern era, offering a lifeline to engine suppliers caught on the back foot without resorting to artificial race-weekend handicaps. By opening up specific windows for financial flexibility and technical development, the FIA aims to create a more level playing field over time, ensuring that the relentless engineering race at the heart of F1 remains both fiercely competitive and sustainable under the cost cap.
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