So what exactly does a tune do?

coyfish

Member
I understand the basic concept of a tune. Adjusts the ECU for your mods. Other than changing the A/F ratio though what exactly does it do?
 
Besides smoothing out the AFR and leaning it out, adjust boost and timing advance ... up to a point this can be done before you start to get too much temperature increase in the cylinder which could cause knock.
 
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