Adding a second nitrous map would be difficult, for me, not impossible though.I don't know if this is what you are looking for but, a little while back, I was working on ECU nitrous control.Basically the A/C button arms the system.When armed and certain conditions are met (load,rpm,speed,TPS etc), the ECU will switch on the A/C output(now hooked to nitrous solenoids), fire the nitrous while retarding X amount of timing.The amount of timing pulled could be loosely based on load, maybe a few different retard values to go with a few different load points.
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