FIA greenlights fourth pre-season test day and engine rebalance for 2027 season

FIA ratifies fourth test day and power unit rebalance at Macau council meeting

The FIA's World Motor Sport Council (WMSC) convened in Macau on Tuesday 23 June 2026 and formally approved a package of regulatory changes covering both the remainder of the current season and the 2027 and 2028 campaigns. The headline decision for teams: pre-season testing will expand from three to four days beginning in 2027. ^[1]

One extra day, one clear reason

The FIA cited car complexity as the direct driver of the change. ^[1] The 2026 regulations introduced a sweeping overhaul of both aerodynamics and power units, and the additional day is intended to give teams more time to calibrate machinery before the opening round. ^[4] The four-day block is expected to be held in Bahrain, which is also set to host the 2027 season opener. ^[3]

The move ends a situation in which teams operating a three-day schedule were forced to share at least one day between both race drivers, a compromise that restricted meaningful mileage and complicated run plans. ^[2]

Engine rebalance locked in for 2027 and 2028

Alongside the testing change, the WMSC ratified previously proposed amendments to the power unit formula. ^[4] The council approved a staged shift away from the current 50:50 split between internal combustion engine output and electrical energy recovery, targeting a 60:40 ratio by 2028. ^[2] Specifically, ICE output will rise while maximum MGU-K power is reduced, fuel flow limits will increase by 5 percent in 2027 and 13 percent in 2028, and teams will gain greater flexibility in energy management strategies. ^[1]

The changes follow widespread driver complaints in the opening months of the 2026 season that the existing energy balance made qualifying and racing feel artificial. ^[4] The FIA said the revisions are intended to allow more flat-out running in qualifying and to reduce the need for energy management during races. ^[4]

First issue of 2027 technical regulations also ratified

The WMSC also rubber-stamped the first issue of the 2027 Technical Regulations, described as a broad package of structural, wording and targeted technical updates designed to improve clarity, consistency and enforceability, incorporating learnings from the 2026 season. ^[2]

Additional measures agreed at the same meeting cover power unit supply arrangements, reconnaissance lap management and race distances at selected circuits, as well as financial regulatory changes linked to the 2027-28 technical and sporting package. ^[2]

:::analysis The fourth test day is a pragmatic concession to the demands of the new regulatory era. Three days was a tight window even before the 2026 cars arrived with their complex active aerodynamics and reworked hybrid systems; four days at Bahrain, with both drivers able to log a clean two-day split, should give engineers genuinely usable long-run data before the pressure of a race weekend. The power unit rebalance is arguably more consequential in the long run: shifting fuel flow upward while reducing peak electrical deployment changes the character of every lap, not just the qualifying phase. Whether a 58:42 split in 2027, hardening to 60:40 in 2028, resolves the fundamental driver concern about artificial energy management will only become clear once the cars turn a wheel under those new parameters. :::

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