With the MGU-H gone from the 2026 regulations, a problem that Formula 1 managed to engineer away a decade ago has quietly crept back onto the agenda.
A new technical challenge has emerged ahead of the 2026 Formula 1 season, and it is one that threatens to complicate the lives of teams and drivers alike: turbo lag. One of the most consequential rule changes for this year is the significantly expanded role of the MGU-K, which now contributes half of the car's total power output — a dramatic shift from previous hybrid configurations.
The removal of the MGU-H was driven largely by its cost and mechanical complexity, but its departure has left a meaningful gap. Beyond storing additional energy, the MGU-H played a crucial role as an electric motor that kept the turbocharger spinning between throttle applications, effectively eliminating turbo lag. Without it, that familiar problem could return in force.
Turbo lag, for those unfamiliar, is the delay between a driver pressing the throttle and actually receiving the boost generated by the turbocharger. The turbine requires a brief moment to spool up to the high rotational speeds needed to produce meaningful power, because exhaust gases alone cannot instantaneously deliver the pressure required.
In a racing context, this manifests as a sluggish response when accelerating out of slow corners, followed by an abrupt surge of power as the turbo comes fully online on the subsequent straight. In the hybrid era, the MGU-H solved this problem by acting as a buffer — keeping the turbocharger at speed during braking and coasting phases. With that solution now regulated out of existence, the issue is back on the table for 2026.
Why is turbo important in F1?
It is not without historical precedent. During the 1980s, turbo lag was a significant and dangerous characteristic of Formula 1 machinery, eventually contributing to the ban on turbocharged engines in 1989 amid concerns over their power, unpredictability, and cost.
Red Bull is among the teams that has openly acknowledged difficulty with the problem in the current development cycle. There are even reports that turbo lag played a role in Isack Hadjar's accident during the pre-season shakedown in Barcelona.
Lando Norris addressed the issue directly in his analysis of the 2026 regulations for BBC Sport: "The biggest challenge is recovering the batteries as well as possible, which depends on using the gears correctly and hitting the right engine speeds. We do experience some turbo lag now, which wasn't really noticeable before".
"These small details have come back, but I don't think they'll dramatically change how you drive. In an ideal world, maybe I'd prefer fewer complications in the car — but this is Formula 1, and there will always be new challenges to face."