The biggest change, though, was a ban on warming tyres in direct sunlight before a session.
The practice is common in Supercars, which doesn't use tyre blankets, to bring the temperature and pressure up so it can be bled back below the minimum limit without contravening the rules.
The knock-on effect of a lower real PSI is reduced degradation, particularly for the super soft tyre that is designed to lose grip rapidly.
However the tyre baking rule has been scrapped before it was formally introduced, with teams still free to have tyres sitting in direct sunlight.
But they have to be in designated areas, namely the tyre tent or the garage, and can't just lay around the paddock as was the case in the past.
Motorsport.com understands the ban was reversed due to concerns from teams over how it would be policed and penalised.
The other rules will remain in place for at least the Darwin and Townsville events.
