How Have the 2026 F1 Engine Changes Affected the Teams So Far?
2026 F1 engine changes meant that Formula 1 entered 2026 with new power units, new aerodynamics and some very bold promises.
The cars would be lighter. Electrical power would become far more important. Advanced sustainable fuel would replace fossil-based race fuel. Meanwhile, new energy controls would create more strategic overtaking.
As Formula 1 heads into its summer break, we no longer need to ask what might happen.
We can examine what the changes have actually demanded from the teams.
The answer is more complicated than simply building a better engine. The first half of 2026 has shown that power generation, energy recovery, active aero, vehicle set-up and driver decision-making are now inseparable.
In 30 Seconds
The 2026 F1 engine changes retained the 1.6-litre turbocharged V6 but removed the MGU-H. Electrical output from the MGU-K increased from 120kW to 350kW, with a target of producing approximately half the car’s power electrically.
However, the biggest shared challenge has been managing that electrical energy. The opening races exposed excessive harvesting, inconsistent acceleration and potentially unsafe differences in closing speed. The FIA responded with rule changes from the Miami Grand Prix onwards.
The first half of the season has therefore been less about one new engine component and more about making the entire car work as one energy system.
Key Takeaways
- The 1.6-litre V6 remains, but the balance between combustion and electrical power has changed dramatically.
- The MGU-H has gone, while the MGU-K is almost three times more powerful.
- Energy harvesting became the first major shared problem of the new regulations.
- The FIA altered recharge, deployment, Boost and race-start rules after the opening three events.
- Active aero, braking, electrical deployment and driver strategy must now be managed together.
- Advanced sustainable fuel has introduced another significant development challenge.
- Further changes to the balance between combustion and electrical power are already being considered for 2027.
What Changed in the 2026 F1 Power Units?
Although most people call them engines, modern F1 cars use power units.
The internal combustion engine is only one part of the system. It works alongside the turbocharger, energy store, control electronics and Motor Generator Unit-Kinetic, better known as the MGU-K.
The main changes for 2026 are substantial.
| Previous Generation | 2026 Generation |
|---|---|
|
1.6-litre turbocharged V6 |
1.6-litre turbocharged V6 Retained |
|
MGU-H and MGU-K |
MGU-H Removed |
|
120kW MGU-K output |
350kW MGU-K output |
|
Approximately 20% electrical power |
Target of approximately 50% electrical power |
|
E10 fuel |
Advanced sustainable fuel |
|
DRS overtaking assistance |
Active aero, Boost and Overtake modes |
|
Less energy recovered per lap |
Far greater energy recovery requirement |
The MGU-H previously recovered energy from exhaust gases. It was extremely clever, extremely complicated and had little relevance to road-car development.
Removing it made the regulations more attractive to new power unit manufacturers. However, it also placed far more responsibility on the MGU-K.
The new MGU-K can deliver 350kW to the rear wheels. That is almost three times the 120kW available under the previous regulations. It can also recover energy during braking, coasting, throttle lift and even while the car remains at full throttle.
On paper, that creates enormous potential. On the circuit, it created an enormous energy-management puzzle. Formula 1’s official power unit guide explains how recharge, Boost and Overtake modes now interact.
What Has Been the Biggest Shared Challenge for the Teams?
Before the season began, much of the discussion focused on engine performance and reliability.
However, the first major issue shared across Formula 1 was energy harvesting.
A 2026 car must recover enough electrical energy to deploy up to 350kW through the MGU-K. Braking alone cannot always provide everything required. Therefore, the cars can also recharge when the driver lifts off, uses part throttle or remains on full throttle towards the end of a straight.
That last process is known as super clipping.
During super clipping, the car remains on full throttle while the electrical system harvests energy. This can change the car’s rate of acceleration before the driver reaches the braking zone.
It may make sense from an energy perspective. However, long periods of harvesting can produce strange-looking laps, increase driver workload and create significant speed differences between cars.
After reviewing data from the first three races, the FIA acted.
From Miami, the maximum permitted recharge during qualifying was reduced from 8MJ to 7MJ. Peak super-clipping power was increased so that the necessary harvesting could happen over a shorter period.
The target was to reduce super clipping to approximately two to four seconds per lap.
Electrical deployment was also restricted in certain parts of the circuit. The full 350kW remains available in key acceleration and overtaking zones, while deployment is limited to 250kW elsewhere.
Boost was capped to reduce sudden differences in speed between attacking and defending cars. The FIA’s April amendments were specifically intended to reduce excessive harvesting and encourage more consistent flat-out driving.
That tells us something important about the scale of the change.
The power units were working. The challenge was controlling how, where and when their electrical energy was used.
Why Does Every Circuit Create a Different Energy Problem?
A power unit cannot use the same energy strategy at every race.
Circuits with long straights, heavy braking zones and slow corners create very different harvesting opportunities from flowing tracks with fewer major braking events.
Teams must calculate:
- How much energy can be recovered under braking.
- Where additional recharge will be required.
- Where the driver will need maximum deployment.
- How much energy should be reserved for attacking or defending.
- How electrical deployment affects tyre grip and vehicle balance.
- How the chosen strategy interacts with active aero.
The FIA has also increased the number of events where lower energy limits may be used. This allows the regulations to respond to different circuit characteristics.
Therefore, teams are not simply developing one effective power unit map. They are developing and refining energy strategies for every type of track.
How Have the Changes Affected the Drivers?
Much of the system is automated through engine maps prepared by the teams. However, drivers now have more control over energy use.
They can use Boost defensively or offensively. They can recharge through throttle lift. They can also qualify for Overtake Mode when they are within one second of another car.
This makes energy a form of racing currency.
Use too much too early and the driver may have less power available later in the lap. Save too much and they may become vulnerable. Recharge in the wrong place and they could lose more time than the recovered energy is worth.
If that sounds like a lot to coordinate at more than 300km/h, that is because it is.
Pre-season feedback suggested that drivers enjoyed the smaller cars and stronger initial acceleration. However, energy management was already identified as an area requiring further evaluation before the opening race. The FIA and Formula 1 began reviewing it during pre-season testing.
How Do the New Power Units Interact with Active Aero?
The 2026 power unit rules cannot be separated from the aerodynamic regulations.
The new cars use moveable front and rear wing elements. In Corner Mode, the wings produce more downforce. In Straight Mode, they reduce drag and allow the car to travel more efficiently at high speed.
This system is available to every driver in designated areas. It is not, by itself, the replacement for the overtaking advantage previously provided by DRS.
Instead, the old DRS function has effectively been divided into two parts:
- Active aero changes the aerodynamic configuration of every car.
- Overtake Mode gives an eligible following car access to an additional electrical energy profile.
There is another complication. If a driver lifts off to recharge, the active aero system is disabled. During full-throttle super clipping, Straight Mode can remain active.
That means a decision about electrical recharge can immediately alter the car’s aerodynamic state. The engineers responsible for the power unit, aerodynamics, control systems and race strategy all need to solve the same problem together.
What Difference Has Advanced Sustainable Fuel Made?
Every 2026 F1 car runs on Advanced Sustainable Fuel.
It can be produced from sources such as captured carbon, municipal waste and non-food biomass. It contains no crude-oil-derived fuel, although the cars still produce carbon dioxide when the fuel is burned.
The regulations now focus on the amount of energy entering the engine rather than simply measuring the mass of fuel flowing through it. The permitted energy flow is limited to 3,000 megajoules per hour.
This places fuel chemistry at the centre of power unit development.
Fuel suppliers must balance energy density, combustion behaviour, efficiency and reliability. Meanwhile, power unit manufacturers must calibrate their engines around the characteristics of their chosen fuel.
The sustainable fuel change has attracted less attention than electrical harvesting during the season. That does not make it less significant. Its effect is buried deep inside combustion efficiency, engine mapping and fuel formulation rather than presented as an obvious new button on the steering wheel. Formula 1’s sustainable fuel guide provides more detail on its composition and regulation.
Have the 2026 Engine Regulations Continued to Change?
Yes.
In addition to the energy-management changes, the FIA amended how the maximum 16:1 compression ratio is measured.
From 1 June 2026, compliance has been checked in both cold and operating conditions. This ensures the limit applies when the engine is running, not only when it is inspected at ambient temperature. The change was approved unanimously before the season began.
More fundamental changes are also being considered for 2027.
One proposal would increase internal combustion engine power by approximately 50kW while reducing maximum ERS deployment by a similar amount. The proposal has not yet become a final regulation.
However, its existence shows that Formula 1 is still assessing whether the original balance between combustion and electrical power delivers the intended racing.
Have the 2026 Changes Delivered Better Racing?
There is no single, simple answer.
The new cars have created different attack and defence options. Drivers must now think about energy availability as well as tyre condition, track position and aerodynamic performance.
However, the FIA’s early intervention shows that the first version of the energy rules did not always produce the intended result.
Too much harvesting could interrupt flat-out driving. Large differences in electrical deployment could create excessive closing speeds. Low-power race starts also required additional detection systems and automatic deployment safeguards.
The revised rules introduced at Miami were later reported to have reduced excessive harvesting without creating material new safety concerns. That is encouraging, but the framework is still developing.
The fairest mid-season verdict is that the changes have created a genuinely different technical challenge. Whether that consistently produces better racing will take longer to judge.
What Should F1 Fans Watch After the Summer Break?
During the second half of the season, watch how the cars behave rather than only looking at their top speeds.
Pay attention to:
- Where drivers recharge during a lap.
- How long electrical deployment continues along major straights.
- Whether a car appears to stop accelerating before the braking zone.
- When drivers save Boost for attacking or defending.
- How Overtake Mode changes the speed difference between two cars.
- Whether different circuit layouts require further FIA adjustments.
These details reveal how successfully the teams are integrating the new power units with the rest of the car.
What Has the First Half of 2026 Taught Us?
The 2026 regulations have not simply replaced one engine with another.
They have changed how an F1 car generates, recovers, stores and uses energy. They have also connected power unit strategy more closely with aerodynamics, braking, fuel chemistry and driver decision-making.
That has affected every team, regardless of its position in the championship.
For the wider motorsport engineering and supply chain, the lesson is familiar. A major regulation change in one area creates new demands throughout the car. Lower mass, tighter packaging and changing performance loads place even greater emphasis on precision, repeatability and dependable component performance.
The first half of 2026 has shown that Formula 1’s new hybrid era is not a finished technical formula.
It is still being engineered in public.