Formula One supremo Bernie Ecclestone says he will try to make new-look machines sound "more like racing cars" after organizers of the season-opening Australian Grand Prix threatened to sue for breach of contract.

The sport is pushing the boundaries of hybrid technology this year with 2014's F1 machines running races on 35 percent less fuel than last season.

Turbocharged engines are back for the first time since 1988, with last year's 2.4-literV8s replaced by 1.6-literV6s.