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The Split Second controller is connected to the intake manifold and in my system I only need it to read up to 10 PSI, although I'm sure that it has been designed to read much higher boost than that. It does not come into the equation until I'm under boost, therefore no, it does not operate when the car is in closed-loop.
None of my turbo related components deal with the OEM ECU in any form, and this includes ignition timing. Retarding is not necessary until one runs more boost (or lower octane) than the system was designed for and the car starts pinging and for those dreaded moments I have an MSD ignition retard controller at my finger tip in the cockpit. I can also increase the W/M injection volume, but that takes stopping the car and popping open the hood and re-adjusting the W/M boost-dependent electronic controller, or the pump pressure.
Programming a map is where I am at at this point. I know how it works, but I've never actually tweaked a car myself. And yes, I do realize that I'm at the point where I should get the car tuned with the help of a knowledgeable person. This Aussie guy (I believe in this Forum) mentioned that he tunes it by "feel" driving and adjusting fuel back and forth until it "feels right". Like I said before, time to shell out another $700 to the local tuner.
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