F1 Engine Regulations Adjusted for 2027, ADUO Safety Net Expanded

The FIA has confirmed a revision to the power unit regulations for the 2027 Formula 1 season, increasing the share of internal combustion engine power relative to electrical energy. In parallel, the governing body has expanded the ADUO safety net for manufacturers who fall behind, with a new first checkpoint triggered by the cancellation of the Bahrain and Saudi Arabian Grands Prix.

Why it matters:

These changes directly impact the competitive balance for the upcoming regulatory cycles. The 2027 power unit adjustment addresses concerns that the current 50/50 electric/ICE split might skew performance too heavily toward hybrids. The ADUO update ensures that manufacturers like Honda and Audi, who have struggled early in the new era, receive timely support to close the gap to frontrunners like Mercedes and Ferrari.

The details:

• 2027 Power Unit Split: The FIA revealed that the ratio of internal combustion engine to electrical power will be modified to increase ICE output, preserving the traditional engine character while still retaining the hybrid components. Exact percentages have not been disclosed but are expected to shift the balance by several percentage points.
• ADUO Update: The Additional Development and Upgrade Opportunities system now includes a first checkpoint earlier in the season, triggered by the missed rounds in Bahrain and Saudi Arabia. This allows struggling manufacturers to apply for extra development tokens before mid-season, rather than waiting until the end of the year.
• Aston Martin & Honda: One beneficiary of the ADUO system is Honda, which left an AMR26 car behind in Japan after the Suzuka race for vibration testing. Early results suggest the decision has helped resolve issues, though full reliability data is still pending.
• Saudi Arabian GP Decision: The 2026 calendar remains in flux as a decision on reinstating the Saudi Arabian Grand Prix approaches. Bahrain, Las Vegas, and Abu Dhabi are being considered as flexible slots to accommodate the reshuffle.

What's next:

The 2027 regulation changes will be formally ratified by the World Motor Sport Council later this year. Teams and manufacturers are already adapting their development roadmaps to align with the new power split. The ADUO first checkpoint will be evaluated after the summer break to assess which manufacturers qualify for additional testing opportunities. Meanwhile, the calendar discussions for 2026 are expected to conclude within weeks, with Saudi Arabia likely to regain its place but potentially on a new date.