Well doesn’t a A/F controller and piggy back computer control ignition timing?
Yes but not effectively. An A/F Controller takes readings from your MAF/MAP sensor and alters them trick your ecu into reading a different signal. And since all your maps are tied in together, your MAF/MAP sensor signal also will move where your ecu reads its ignition timing on the map. your MAF/MAP is not only used to maintain air/fuel, but its also used by the ecu to determine load, and load is used for determining timing advance, this has the side effect of fooling the ecu into advancing timing beyond what is safe. These readings will also effect where your cam angle is, which more then likely will not be at the optimal angle for your boosted application.
