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Stage 2 is P&D control, stage 3 is P&I. Stage 2 intent is to control the final approach to target, if you are overshooting target it is usually stage 2 settings. Stage 3 intent is to keep the boost on target once the target has been reached. In laymans terms, Proportional is how much the ecu adjusts the DC based on how much error there is. Too little P = slow to reach target(or never reach target), too much P = overshoot or oscillation. Derivative effect I find easiest to imagine as how quickly the ecu pulls back the DC when the boost is getting close to target (kind

Aah, I shall do so. Thank you. Edit: Bingo !! All good. Thanks Adam/Vaughan.

Update: The car is running very well and idles perfectly, I never wired up my BAC (Idle Air Control Valve) on the car, and I remember when creating the base-map I set it up to run with ISC control not sure if that was from the FD base-map but my intention from the beginning was to utilize the BAC anyways. The car starts with ease, better than ever (even better than the stock ECU lol). I thought I'd share this for people intending to run a Link on their FC RX-7, I'm no expert tuner but this could help anybody in my situation. Details on my setup: - Stock Port S4 NA Engine (9:4: