ahh long writing again..but then i'll try to shorten a bit kekekeke
basically the idea in this so call anti-lag-system or bang-bang-system is opening the throttle plate (butterfly) by a little degree (maybe 10-20deg..can't remember) and make sure air still entering the engine and exhaust still flowing through turbine blades BUT to keep rpm lower when u off-paddle, it have to retard the ignition timing and getting low rpm RICHER.
then, when exhaust valve open...unburn exhaust going out though the exhaust valve and the ignition so late that will explode the a/f mixture that rich. this explosion causes the turbin blades spin faster and fire comes out of exhaust tip/muffler