The FIA has completed its review of the power loss that disrupted the start of the Bahrain Grand Prix in Malaysia on 4 October, setting out changes to wet-weather software and its testing.
Formula 1's race report recorded several cars struggling to maintain speed on the formation lap at Sepang. Lewis Hamilton stopped on the start/finish straight before getting moving again, and race control suspended the start procedure so the problem could be addressed.
What the investigation found
In its findings published on 8 October, the FIA says some cars at low engine revs suffered a greater-than-intended loss of power in sectors where a 250kW reduction applied. That loss could not be recovered within those sectors.
The configuration established at Sepang will be reinstated for the Singapore Grand Prix if similar weather conditions are expected. A further wet-weather software update is planned for the United States Grand Prix on 25 October.
Testing and verification
The governing body says teams and power-unit manufacturers had validated the package in simulations before it was run in first practice at the Belgian and Dutch Grands Prix.
The FIA also plans stronger validation through independent assessment, team and manufacturer feedback, and input from the standardised electronic control unit supplier.