Official FIA decision: tighter controls on compression ratio
The 2026 Formula 1 regulations are still evolving, despite the championship set to begin in less than a week. Teams and the FIA are continuing to evaluate and vote on changes related to race starts, energy management, measurement procedures for specific components of the new-generation cars and many other technical factors.
Meetings have been frequent, as have the proposals under discussion. Mid-season regulatory tweaks are not unusual in Formula 1, but in this year of major technical revolution we could even witness more radical adjustments – such as a reduction in usable battery energy or an increase in MGU-K recovery power to limit the so-called “super-clipping” phenomenon currently being observed with these cars.
For now, however, after several rounds of meetings, discussions and political back-and-forth, the FIA has officially amended the 2026 regulations with some significant updates. The most important changes concern the new power trains.
Compression ratio control officially approved
The amendment to the compression ratio monitoring procedure has now been formally approved. A political battle involving Audi, Ferrari, Honda and finally Red Bull against Mercedes – played out through meetings, letters, proposals and counter-proposals – has ultimately led to a final solution that has been voted on and is now officially written into the rulebook.
From 1 June 2026, the compression ratio will continue to be checked through static “cold” tests, as is currently the case, but will also be subject to a new “hot” test at 130°C. The aim is to close any potential regulatory loopholes and prevent solutions that push to the limit – or beyond – of the technical regulations.
The compression ratio must never exceed a value of 16:0 under any circumstances.
Other 2026 regulation changes: Q3 extended, Monaco rule removed
Two additional regulatory modifications have also been highlighted. The first is a one-minute extension of the Q3 qualifying session, which will increase from the familiar 12 minutes to 13 minutes. This is clearly a procedural adjustment, evaluated according to team requirements linked to the characteristics of the new 2026 cars.
On the other hand, a novelty that had only been approved a few months ago has now been scrapped. At the Monaco Grand Prix, a second mandatory pit stop will no longer be required. The sport therefore returns to tradition, leaving it to the circuit, the drivers and the new-generation cars to create the spectacle, rather than artificially increasing the number of compulsory pit stops—at least for the time being, pending real-world feedback.
The FIA’s decision to implement “hot” compression testing by June is therefore a clear victory for the manufacturers challenging Mercedes’ early technical interpretation of the 2026 power unit rules. By standardizing measurements at 130°C, the governing body is effectively neutralizing any advantages gained through thermal expansion or materials science that might have allowed for a higher effective compression ratio during peak operating conditions. This move, combined with the extra minute in Q3 to manage the unique battery deployment cycles of the new cars, suggests that the FIA is prioritizing technical transparency and competitive parity as the sport enters this uncharted territory.
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