Quote Originally Posted by gotmeaT-5 View Post
Going back to the MBC: What prevents the ECU from sending the fuel out signal from leaving the electronic connector on but diverting the compressor and wastegate pipes to my MBC? Or is my understanding floored on on the TCV/BCS works ?

[My understanding is as follows correct as necessary please: Compressor builds the boost to the desired level, ECU registers this set boost closes the compressor port opening the wastegate port allowing the pressure to act on the wastegate and not as a vacuum keeping the wastegate closed but diverting to the central port going to the fresh air hose]

What is a good baseline figure to start with ? @70mph I'm registering 12-15psi
tbh i'm not quite sure what you mean. But i can clear one part up for you, the ECU doesn't measure boost in any way on 850's. The ECU has a set pattern to open & close the BCS at different rates depending on rpm, load, throttle position etc to raise the boost levels