The ADUO is one of the key talking points of this long spring break in Formula 1.
Much has been written and discussed about its nature, whether it represents a disguised form of Balance of Performance, how it is allocated, and in what ways it allows modifications to the power unit.
However, one fascinating and crucial aspect remains to be explored: the curious “friendship” between the ADUO and the chassis.
The ADUO, a tool that can be revoked
The fundamental difference between a system like the ADUO—short for the rather elaborate “Additional Upgrade and Development Opportunities”—and the Balance of Performance lies in the very nature of the two tools, which ultimately share the same final objective.
We know that in a championship like the WEC, Balance of Performance acts on weight and torque curves to equalise performance between cars that differ significantly in concept, potential, and architecture. Does this mean that BOP alone determines victory or defeat? No, of course not. It does not mask the strengths or weaknesses of a project. However, an increase of 30 kg in minimum weight has a lap time effect that is simply… unavoidable.
By contrast, the ADUO intervenes indirectly on the performance of a single Formula 1 power unit.
The concept is similar to Aerodynamic Testing Restrictions (ATR), which limit wind tunnel and CFD usage based on Constructors’ Championship position. The further a team or engine manufacturer is behind in performance, the more resources it is allowed to dedicate to development and upgrades.
ATR and ADUO provide resources, not solutions: an engineering group that designs poorly will continue to do so even with more hours in the wind tunnel or on the dyno. Conversely, a team capable of identifying weaknesses can correct them and close the gap to rivals at the front.
The differences discussed so far are anything but marginal, yet the core objective of both BOP and ADUO remains identical: achieving performance balance. Several elements within the structure of engine concessions highlight how their primary goal is to bring different power units within the famous 2% performance window between the best and worst units.
For example, technical regulations limit ADUO eligibility only to manufacturers that fall within specific development periods, between race 1 and race 12. In simple terms, this prevents a situation where a dominant engine—like the Mercedes one—deliberately reduces performance after Miami in order to re-enter the system between race 13 and race 18.
Even more important is the final clause of paragraph 4 of the ADUO appendix: the FIA reserves the right to implement corrective actions, at its sole discretion, should upgrades introduced via ADUO create a competitive imbalance. These actions will be discussed in good faith with the manufacturers involved.
This sentence is far from trivial: at any time, the FIA can partially or fully revoke ADUO concessions, whether in terms of upgrades themselves, budget cap increases, or additional dyno hours. These few lines clearly confirm the legislator’s intent when designing the system: allow struggling manufacturers to recover, but only within the 2% performance window.
To put it simply, if Ferrari’s V6 engine is around 30 horsepower behind Mercedes—therefore more than 4% down—and benefits from two upgrades in 2026 plus another two in 2027, then caution is required. These concessions are not guaranteed to remain permanently with Maranello.
In the best-case scenario for the Tifosi, if the updated V6 introduced in July manages to close most of the gap—reducing the deficit to around 10 horsepower, for example—the FIA could begin reducing Ferrari’s remaining ADUO benefits.
How? In any way deemed necessary to ensure that these concessions do not turn into a BOP-like springboard—a launch system powerful enough to automatically make the Italian power unit the strongest on the grid. For example, extra 2027 upgrades could be removed entirely or partially, dyno hours could be reduced, or even only one upgrade could be allowed for 2027, cancelling the second development step in order to keep concessions within the 2–4% performance band.
Without such a mechanism, the FIA would find itself in a dead end, with the risk that by 2027 the current benchmark—Mercedes—could fall behind due to lacking ADUO in 2026, while others benefit from concessions and then leap ahead in performance, repeating the cycle.
The outlook: ADUO brings the chassis back into focus
Once it is understood that the FIA’s objective is to keep all engines within roughly ten horsepower of each other, it becomes clear that what currently makes a 2026-spec car competitive may not necessarily do so in the future.
At present, Mercedes’ greatest strength lies in longitudinal stability, especially under traction. The W17, as has been written multiple times, is designed to avoid sliding at all costs, even if that means sacrificing speed in certain corners, in order to maximise the performance of its powerful power unit.
The closer power unit performance becomes across manufacturers, and the more rivals learn to exploit energy recovery and deployment strategies, the more lap time will once again depend on chassis quality.
And this is where one of the most fascinating implications for the 2026 season emerges: as power unit performance converges, will the W17’s concept remain the benchmark? Will McLaren’s expected Miami upgrade package challenge a car that currently appears unbeatable but has yet to reveal its true behaviour at the limit?
Will ADUO bring Ferrari close enough in horsepower to further unlock a chassis that has already managed to score podiums with a deficit worse than what Alpine experienced last year, suggesting enormous untapped potential—one might consult the entry for “Latin dances” to understand the rhythm of its development…?
These are the questions that 6 cylinders will attempt to answer this week.
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