CHEMMINS 10+ year member
CarAudio.com Veteran
A 220 amp alt is almost 3x the size of the one you have now. And remember that 80a alt you have is not at idle. No factory alt is. So guesstimating your alt is only running 45-60 amps at idle or less. A 220 amp alt will idle at 120ish.
And an amp that is efficient still pulls power.
And an amp that is efficient still pulls power.