Hi all first post on this forum so here goes:

Right iv bought a s2 erst (mostly standard) and im still learning about these engines i have a rough idea of how to tune them but im still abit confused...
I know the ecu controls the spark and boost limit what else does it control? how do you change the fuel mapping if you say put in a ported head and cam and up the boost?

thanks, il get some pics of my rs up aswell