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ECMLink's boost control mechanism is modeled after the factory implementation provided on 1995+ DSMs and Lancer EVOs. The most notable difference being that ECMLink's implementation provides gear-based control rather than a single curve that applies all the time.
The basic operation goes like this:
This sounds pretty simple and it really is, but once you start picking about the phrases, you'll see there's a bit more involved than it might seem at first.