FIA tightens Monaco Grand Prix regulations with Rev1 engine map and fixed aero rules to control F1 speeds
The Monaco Grand Prix is set to undergo one of its most significant technical overhauls in recent years, with the FIA introducing a series of targeted regulations designed to improve safety at Formula 1’s most demanding street circuit. Alongside restrictions on aerodynamic activation, a new engine mapping system will also be deployed to control top speeds and manage the behaviour of the hybrid power units.
Monaco has always represented a unique challenge in the Formula 1 calendar. Over more than seven decades, the Principality’s narrow streets have tested the precision and bravery of the world’s best drivers, and this season the event takes on an even more complex technical dimension as the sport continues its regulatory evolution.
While the driver remains central to performance in Monte Carlo, the latest rule changes introduced under the new regulations are expected to have a major influence on both race strategy and car setup, particularly in relation to safety margins and energy deployment.
FIA removes active aerodynamics for the Monaco Grand Prix
One of the most significant changes confirmed by the FIA is the full restriction of active aerodynamics throughout the Monaco weekend. For the first time this season, drivers will not be permitted to open movable aerodynamic elements at any point during qualifying or the race.
This includes the start/finish straight, where previous seasons allowed limited activation of adjustable aero systems. The decision reflects a broader FIA strategy aimed at reducing risk in high-speed zones where stability and driver control are critical.
Under FIA guidelines, DRS-style activation zones are typically only allowed in areas where cars are not operating at the absolute limit of grip. This means sections where lateral or traction loads are lower, such as straight-line acceleration zones rather than corner exits or high-load cornering phases.
To ensure safety, any activation window must also meet a minimum duration threshold of over three seconds, preventing overly short activation zones that would add operational complexity without meaningful performance benefit.
Why Monaco requires additional safety restrictions
In previous seasons, the rear straight at Monaco allowed cars to reach speeds approaching 290 km/h with limited aerodynamic assistance for just over five seconds. However, with the introduction of more powerful hybrid systems delivering up to 350 kW from the MGU-K, acceleration phases have become significantly more aggressive.
This has reduced the relative benefit of aerodynamic opening phases while increasing the risk of excessive speed heading into heavy braking zones such as Sainte Dévote, where elevation changes and a bump under braking already make stability a critical factor.
As a result, the FIA has opted to restrict straight-line aero usage entirely, prioritising braking stability and driver control over marginal top-speed gains.
Rev1 engine map introduced to control MGU-K performance
Beyond aerodynamic restrictions, Monaco will also feature a bespoke power unit configuration known as the “Rev1” engine map. This system introduces an alternative MGU-K power curve specifically designed for high-risk street circuits.
The objective is twofold: first, to reduce peak speeds on long acceleration zones such as the start/finish straight, the climb toward Casino Square, and the tunnel section; and second, to moderate approach speeds into critical braking areas where run-off space is extremely limited.
Although maximum MGU-K output remains unchanged at 350 kW, the way that power is deployed across the speed range is significantly altered.
Under standard conditions at other circuits, the MGU-K can deliver full power up to around 290 km/h before gradually reducing output, eventually dropping to zero beyond approximately 345 km/h depending on energy strategy and team settings.
In Monaco, however, the Rev1 map modifies this behaviour substantially. Full deployment of 350 kW is only available up to 200 km/h. Beyond that point, power reduction begins earlier and more aggressively: around 270 km/h output drops to roughly 100 kW, and by 300 km/h the MGU-K contribution is fully phased out.
Impact on overtaking and race strategy
The FIA has also adjusted the overtaking (“overtake mode”) configuration to align with the Rev1 mapping system, although the principle differs from standard circuits.
At most tracks, overtake mode allows drivers to extend the 350 kW deployment window beyond the standard limit, improving acceleration and allowing higher top speeds for a longer period before energy cut-off.
In Monaco, however, the structure is different. While the initial 350 kW limit still ends at 200 km/h, as in standard Rev1 conditions, the rate of power reduction is softened in overtake mode, allowing drivers to retain a more usable level of electrical assistance for longer during acceleration phases.
In practical terms, this means that at around 260 km/h, drivers may still have close to 100 kW more available compared to standard mapping, improving responsiveness without increasing peak speed risks.
Safety-driven engineering decisions at the heart of the changes
The FIA’s primary motivation for these adjustments remains safety. Monaco is one of the most unforgiving circuits in Formula 1, where even small misjudgements can result in contact with barriers due to the lack of runoff areas.
With modern hybrid systems delivering instant torque and significantly improved acceleration performance, managing energy deployment has become a key factor in controlling speed increases across critical sections of the lap.
Importantly, the FIA has confirmed that teams were informed of all operational parameters in advance. This includes details on aerodynamic activation zones and engine mapping configurations, typically communicated at least four weeks before the event to allow teams to prepare simulator models and race strategies.
These pre-event technical briefings ensure that teams such as Ferrari, with Lewis Hamilton and Charles Leclerc, alongside rivals across the grid, can fully optimise their setups while operating within clearly defined safety boundaries.
Monaco as a test case for future regulations
The introduction of the Rev1 mapping system and full aero restrictions at Monaco may also serve as a reference point for future regulatory decisions in other high-risk circuits on the Formula 1 calendar.
As Formula 1 continues to evolve its hybrid power units and increase electrical performance, balancing speed with safety remains a central challenge for the FIA. Monaco, with its unique layout and minimal margins for error, provides an ideal environment to test such targeted interventions.
If successful, these measures could influence how the FIA approaches engine mapping, energy deployment and aerodynamic activation in other street circuits moving forward.
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