they both

squeeze
bang
blow

the only diference is one sucks and one is forced,

as long as detination isnt ocuring an engine is fine watever AFR's are,

it does my head in when people go on about AFRS when mapping etc,

its all about the timing and detting that killes the engines


you could run a turbo engine with 14.5:1 AFR and not melt it, but it wouldnt have muh power at you would have hardly any advance timing in the map