Which part did Honda spend the most development time on?

Toyoharu Tanabe said last week that changes had been made to the ICE, turbo and ERS to improve engine power and reliability? But what does this actually mean?

"It seems that a huge amount of development has been carried out to improve the configuration of the combustion chambers, in favour of greater thermodynamic efficiency, while at the same time the electrical component has been thoroughly revised," writes the Italian sports newspaper.

Last year Max Verstappen complained several times about not having the full power of his Honda engine at every stage of the Grand Prix. Complex analysis has therefore been carried out of the different ways in which the power unit can be used while the electrical systems remain at full capacity. These extensive analyses should solve this problem.