The 2026 Formula 1 power-unit regula-tions introduced a roughly even split between internal-combustion and electrical power, with a 350 kW MGU-K and a 4 MJ usable battery whose recharge per lap iscapped by the FIA. After the first three races of theseason (Australia, China, Japan), driver and team feed-back pushed the FIA to publish a refinement packageeffective from the Miami Grand Prix on 1–3 May 2026.This note treats those refinements as a discrete delta ontop of the as-raced 2026 regulations and quantifies theirfirst-order effects with closed-form energy arguments and aone-degree-of-freedom point-mass straight-line model. Theheadline results are that the 250 → 350 kW superclipcap shortens the time required to refill the battery byroughly 29 %; the 8 →7 MJ qualifying recharge cap costson order 0.05–0.1 s per lap depending on circuit type; andthe +150 kW boost cap reduces worst-case attacker-versus-defender closing speeds relative to the original full-poweroverride.
Ghoussoub et al. (Mon,) studied this question.