ADUO Grades the ICE but Permits Broader Power-Unit Work

The allowance is public; the fit is not

The FIA's August 26 ADUO announcement published a clean list of development allowances. Mercedes received one extra homologation in 2026 and one in 2027 after landing in the two-to-four-percent deficit band. Audi, Ferrari and Honda received two in each season after exceeding four percent. Red Bull received none, and the second review period added no new grants.

Competitors now have to spend those opportunities well. Fans have to understand what the allowances say about the engineering contest. Both groups run into the same problem: the index grades internal-combustion-engine performance, while a successful grade opens work across a much broader range of power-unit components. A catch-up rule can be generous or strict. It should first be coherent about the deficit it claims to correct.

One ruler, a much larger workshop

The index is not a casual glance at a speed trap. The FIA says it uses ICE performance, input-shaft torque, engine speed, MGU-K power and lap-time weighting. On-car variables are captured without correction. Even after that work, the governing body's own explainer says the result is not representative of the full power unit because the energy-recovery system remains crucial to total performance.

The permission is far wider. An ADUO grant can cover the ICE, exhaust, turbocharger, electrical systems and sensors, ERS and cooling, MGU-K, control electronics, hydraulics, fluids and ballast. The rule brings a precise ruler to one part of the contest, then hands over the keys to nearly the whole workshop.

That does not make every upgrade unfair. It makes the connection between diagnosis and remedy difficult to defend. If the index deliberately excludes part of power-unit performance, its result cannot double as a complete ranking of the machinery available to drivers. Formula 1 already asks viewers to separate the driver from the car at racing speed; the regulation should not make that judgment murkier by grading one scope and rewarding another.

Ferrari makes the scope visible

Ferrari has already supplied the useful example. Motorsport reported that its ADUO upgrade for Monza revises the combustion chamber and turbocharger and introduces new fuel. The Italian Grand Prix cannot isolate every effect inside that package, but the package makes the regulatory scope tangible: an ICE-based allocation has enabled coordinated work beyond the ICE alone.

The public results support an inference that Red Bull remained the ICE benchmark. They do not establish that Red Bull had the best complete power unit, and The Race noted that the published bands do not reveal smaller movements within them. Motorsport likewise identified energy-management factors outside the narrow ICE measurement. Turning the ADUO table into an all-purpose power-unit hierarchy would give the numbers a certainty the methodology rejects.

The defense wins the 2026 argument

ADUO's strongest defense is better than a shrug. An ICE index is auditable, protects confidential manufacturer data and avoids turning championship position into a subjective balance-of-performance judgment. The manufacturers agreed the system, and an extra homologation is permission to attempt an improvement, not an improvement delivered in a crate. Each recipient still has to design something that works.

The FIA also says its analysis is robust while keeping the detailed methodology confidential. That limit is legitimate in an engineering contest. Public disclosure cannot become a guided tour through every manufacturer's proprietary data. Simplicity and confidentiality explain why the 2026 framework uses the index it does.

They also settle the immediate remedy. Red Bull challenged the result, but a challenge should not erase allocations made under a manufacturer-agreed process. Keep the 2026 grants. Reopening them because the first published result drew an objection would replace a structural mismatch with improvised governance.

Make the 2027 rule answer one question

For 2027, the FIA and manufacturers should align the two sides of the rule. They can broaden the index toward full power-unit performance and retain the broad upgrade menu. Or they can keep an ICE-centered index and narrow the eligible work toward the deficiency that index actually identifies. The FIA says the methodology may evolve; this is the proportionate evolution.

The third review period runs from the Netherlands through Mexico City. Yet a manufacturer with no ADUO after the first two periods cannot qualify through the final period, which leaves Red Bull outside the 2026 allowance. That boundary separates the remaining 2026 review from the 2027 rule choice; it does not invite the current season to be re-litigated after every result.

Monza should therefore be evidence, not a referendum. Watch what Ferrari changes, then ask whether the development freedom addressed the deficit the FIA measured or reached performance the index never graded. By the next allocation cycle, that question should have one intelligible answer. If Formula 1 wants its engineering contest to leave room for the driver's contribution to remain visible, it cannot keep using an ICE verdict as a key to a wider power unit.