6 Cylinders: F1 2027, will the chassis be a bigger challenge than the Power Unit?
As the FIA prepares to reduce the aerodynamic downforce of the 2027 Formula 1 cars, and discussions surrounding next year’s Power Units remain deadlocked, engineers are entering a period filled with uncertainty.
Traditionally, June is the month when most teams begin shifting a significant portion of their resources toward the following season’s project. Once the overall targets and design objectives of the new car have been established, attention turns to finalising components with the longest development timelines — the chassis, gearbox and several mechanical parts — while aerodynamic departments begin studying and testing new concepts in the wind tunnel and through CFD simulations.
These are crucial weeks for evaluating completely different solutions, particularly for components such as the front wing, which ultimately dictates the entire downstream airflow structure of the car.
This year, however, the work of Formula 1 teams has been made considerably more difficult by the political storm surrounding the new regulations. The inevitable question is whether the competitive order we will see nine months from now is actually being determined right now.
The 2026 F1 cars? Too fast
The latest developments point to a deadlock that appears increasingly difficult to break. Everyone agrees that some form of intervention is necessary, yet finding common ground on both timing and implementation remains extremely challenging.
Running alongside these discussions, the FIA has made its intentions clear: aerodynamic downforce levels must be reduced for 2027.
So far, Formula 1 has delivered races where cars have been able to follow each other closely without suffering major limitations from dirty air. Many overtaking opportunities have been created through Power Unit energy management, but the ability of the cars to remain close together has undoubtedly helped, if not amplified, the spectacle.
At the same time, however, the cars are proving to be too fast, while the aerodynamic freedoms available under the current regulations have encouraged a rapid proliferation of solutions and appendages designed to shape airflow and, above all, direct it away from the car.
The FIA fears that leaving teams with complete freedom could quickly result in massive downforce gains, accompanied by a significant deterioration of the wake left behind the cars. The consequences would be immediate and familiar for any driver attempting an overtake: less grip, greater tyre overheating and a much smaller window in which to complete the move.
There is also another concern. Greater downforce inevitably comes with higher drag, creating additional challenges for teams trying to manage the limited energy available from the Power Units. Over time, even the Pirelli tyres could suffer from excessive aerodynamic loads. In that scenario, the resulting increase in tyre pressures would further reduce grip, creating a vicious cycle that is clearly undesirable.
A comparison between the qualifying lap times of 2025 and 2026 reveals only one event — Melbourne — where the new-generation cars performed exactly as expected.
In Australia, the 2026 cars were approximately three seconds slower than their 2025 counterparts. The gap between the pole positions of Lando Norris and Kimi Antonelli stood at 3.4 seconds, while the new cars were also around one second slower than the 2022 machines, the first generation of the ground-effect era.
As the season progressed, however, the deficit stabilised between one-and-a-half and two seconds. Shanghai produced the smallest gap of all, with just 1.4 seconds separating Oscar Piastri’s 2025 pole lap from Kimi Antonelli’s 2026 benchmark. Suzuka delivered the largest difference, with 1.8 seconds between Max Verstappen’s outstanding 2025 pole position and Antonelli’s effort this season.
Track characteristics naturally play a role, as does the energy deficit currently affecting the 2026 Power Units. Nevertheless, the overall trend is clear. The 2026 cars gain performance mainly through traction and in the first half of straights, where speeds are already extremely high.
They perform reasonably well in slower corners, particularly where rapid changes of direction are required. George Russell, for example, carried a higher minimum speed through Montreal’s final chicane in 2026 than in 2025. However, the cars struggle significantly in the sections where Power Unit energy recovery traditionally takes place: at the end of long straights, through sequences of fast corners and during the short acceleration zones found in slower sectors, such as Miami’s famous toboggan section.
Yet the fact that the performance gap remains below two seconds at virtually every circuit demonstrates that these limitations are still relatively contained. This means that if engineers were allowed to design the 2027 aerodynamic packages under the current regulations, cornering speeds could quickly return to levels similar to those seen in 2025, limited only by energy recovery requirements.
While such a development race would undoubtedly create a fascinating technical battle, Formula 1’s much-discussed raceability — the ability of cars to follow each other closely — would almost certainly suffer.
Power Units and chassis: an incredibly complex relationship
It becomes easy to understand why the FIA wants to intervene on wings, floors and various aerodynamic devices in order to slow the relentless pursuit of downforce. The reasoning is difficult to dispute, especially because if the 2026 regulations deserve credit for one thing, it is undoubtedly the ease with which cars can race closely together.
Ferrari’s Flick Tail Mode is a perfect example of the type of solution that quickly attracts regulatory attention. The FIA has never been particularly fond of using exhaust gases to generate downforce, and the system has proven highly effective at producing additional rear load. Eliminating it prevents an expensive development race that could quickly undermine the objectives of the rule makers.
The situation becomes considerably more complicated when engine performance enters the equation, particularly with the 2027 Power Unit regulations still being discussed.
While it now appears almost certain that fuel tank capacities will remain unchanged — allowing several teams to retain much of their 2026 chassis architecture — the uncertainty surrounding engine performance is creating major challenges for aerodynamic departments.
The Ferrari SF-26 is a perfect example of a car conceived around the expectation of significantly more horsepower than the Scuderia’s Power Unit has delivered so far. More power would be required to compensate for the car’s high drag levels, which are themselves the result of a very aggressive downforce philosophy adopted during the design phase.
At present, the FIA and the engine manufacturers are discussing whether and how to add as much as 70 horsepower to the internal combustion engine. The electric contribution is less significant at the very highest speeds, where aerodynamic drag becomes the dominant factor. For engineers defining the concept of the 2027 cars, however, this is a crucial variable.
Designing a chassis with sufficient flexibility, together with an aerodynamic package capable of quickly recovering downforce even after FIA-imposed reductions, will be essential. The same flexibility will also be required to adapt to an engine that could ultimately produce twenty, thirty or even forty horsepower more or less than currently anticipated.
At the same time, teams hope for a simpler energy recovery system, while the ADUO mechanism could help reduce performance differences between manufacturers. If that happens, chassis design and aerodynamic efficiency would once again become decisive factors in determining overall competitiveness.
The result is a complex web of interconnected regulations, but also one that could prove decisive. The teams that adapt their projects most effectively may find themselves holding a strong hand when the 2027 season arrives.
Engineers will therefore need to demonstrate extraordinary flexibility, while team leaders will hope that the political discussions ultimately guide the FIA toward decisions that make the task more manageable.
After all, the 2027 Formula 1 season has already begun.
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