What is power unit architecture (2026) in Formula 1 (Technical)?

Verdict

1.6 L V6 turbocharged ICE retained; MGU-H removed; MGU-K output tripled; 50/50 ICE-to-electric split (target ~750 kW combined peak power); Energy deployment limits: 4 MJ per lap from MGU-K (up from 2 MJ)

Why people argue about this

People often assume that the tripled MGU-K output means a significant increase in top speed for F1 cars, which they mistakenly believe will lead to more overtaking opportunities. However, the actual impact of this rule is on managing energy recovery systems rather than raw performance, so it won't necessarily translate into faster lap times or easier passes.

Send this to your friend — argument over.

Section 5: Rules of Play

Power Unit Architecture (2026)

1.6 L V6 turbocharged ICE retained; MGU-H removed; MGU-K output tripled
50/50 ICE-to-electric split (target ~750 kW combined peak power)
Energy deployment limits: 4 MJ per lap from MGU-K (up from 2 MJ)
Fuel flow rate cap: 3000 MJ/h (energy-based, replacing 100 kg/h mass-based cap)
Compression ratio (Article C5.4.3, as amended by Issue 19): no cylinder may have a geometric compression ratio higher than 16.0, and any component, assembly, mechanism, or integrated arrangement designed or functioning to increase the compression ratio beyond 16.0 in operating conditions is prohibited. Following pre-season and Barcelona/Bahrain test findings that some designs behaved differently once heat-soaked, Issue 19 requires the compression ratio to be measured both at ambient temperature and with the engine heated to 130°C from 1 June 2026 through 31 December 2026, closing a measurement loophole; from the 2027 season the check reverts to the 130°C operating-condition measurement only.
Boost mode and wet/low-grip running (Issue 19): after early-season concerns that full driver-selected "boost mode" torque delivery could cause loss of control on a wet or low-grip track, the FIA amended the regulations so that in wet or low-grip conditions with poor visibility, boost mode is available only in a restricted form that prevents a reduction in power output without permitting any increase above the harvested-energy baseline. In the same wet/low-grip conditions, the driver-operated "overtake mode" push-to-pass function is disabled for safety.

Aerodynamics

Active aerodynamics: driver-operable wing-flap actuators (front + rear) — Z-mode for cornering downforce, X-mode for straight-line drag reduction
Ground-effect Venturi underfloor retained from 2022-onward regulations
DRS (Drag Reduction System) replaced by the active rear-wing element

Materials & Construction

Composite chassis must pass FIA crash tests (front impact, side intrusion, rear impact, rollover)
Power unit elements limited per season (penalties for exceeding allocation — covered in Sporting Regulations)

Section 5: Rules of Play

Power Unit Architecture (2026)

1.6 L V6 turbocharged ICE retained; MGU-H removed; MGU-K output tripled

50/50 ICE-to-electric split (target ~750 kW combined peak power)

Energy deployment limits: 4 MJ per lap from MGU-K (up from 2 MJ)

Fuel flow rate cap: 3000 MJ/h (energy-based, replacing 100 kg/h mass-based cap)

Compression ratio (Article C5.4.3, as amended by Issue 19): no cylinder may have a geometric compression ratio higher than 16.0, and any component, assembly, mechanism, or integrated arrangement designed or functioning to increase the compression ratio beyond 16.0 in operating conditions is prohibited. Following pre-season and Barcelona/Bahrain test findings that some designs behaved differently once heat-soaked, Issue 19 requires the compression ratio to be measured both at ambient temperature and with the engine heated to 130°C from 1 June 2026 through 31 December 2026, closing a measurement loophole; from the 2027 season the check reverts to the 130°C operating-condition measurement only.

Boost mode and wet/low-grip running (Issue 19): after early-season concerns that full driver-selected "boost mode" torque delivery could cause loss of control on a wet or low-grip track, the FIA amended the regulations so that in wet or low-grip conditions with poor visibility, boost mode is available only in a restricted form that prevents a reduction in power output without permitting any increase above the harvested-energy baseline. In the same wet/low-grip conditions, the driver-operated "overtake mode" push-to-pass function is disabled for safety.

Aerodynamics

Active aerodynamics: driver-operable wing-flap actuators (front + rear) — Z-mode for cornering downforce, X-mode for straight-line drag reduction

Ground-effect Venturi underfloor retained from 2022-onward regulations

DRS (Drag Reduction System) replaced by the active rear-wing element

Materials & Construction

Composite chassis must pass FIA crash tests (front impact, side intrusion, rear impact, rollover)

Power unit elements limited per season (penalties for exceeding allocation — covered in Sporting Regulations)

Power Unit Architecture (2026)