Overview
- Stakeholders reached the compromise on June 10 to move the power split from 53/47 toward 58/42 in 2027 and 60/40 in 2028 by increasing fuel flow, raising ICE peak power and lowering continuous electric motor limits.
- Key technical changes include a 5% fuel flow rise in 2027 (13% in 2028), ICE max power lifting from 400kW to 420kW then 450kW, a reduced continuous MGU‑K limit of 300kW with Overtake Mode retained, and higher energy harvesting caps.
- The agreed amendments will be presented to the World Motor Sport Council for formal approval on June 23 in Macau to lock in the 2027 and 2028 rule changes.
- A separate controversy remains over a provisional ADUO assessment that reportedly named Red Bull the ICE benchmark and allocated upgrade allowances to Mercedes, Ferrari, Audi and Honda, but the FIA is rechecking sensors and data after Red Bull’s request so the results are not yet published.
- Paddock critics say the ADUO system is flawed because it measures only ICE output while permitting development of electrical parts, which creates a measurement‑to‑upgrade mismatch, strategic timing risks for upgrades and practical lead‑time and cost challenges for manufacturers.