I want to make a turret able to aim up 80 degrees and down only 20 degrees, I don't think aimRange can take care of it, is there a way to do this without lua?

Not really.

The ini value can only limit it in both directions at once, so you might be able to do some trickery where it's already tilted halfway between those two values but looks like it's upright, but more likely it's easier to do with Lua.