Link

Is there a way that link g4 can do close loop lambda after the maximum setting of 0.7 bar boost?

And does link do the steady 2-3-4000 rpm like the previous module aem ecu to archive the maximum torgue?

I'm not sure I follow? You can run closed loop control at any boost level you like by setting the maximum MAP to whatever point you choose. I'm also not sure what you're referring to regarding the steady state tuning? It's the dyno that maintains the engine speed, not the ECU.