Quote Originally Posted by Gixxer750 View Post
Hopefully you are still an active user in the forums. I came to the HP Tuners forum looking for help with the exact set up that you have just described. I have the 8 wire MAF in a centri configuration. I used my OE 1 bar MAP sensor that i replaced with a 3 bar to support the blower pressure in the intake. So every time i give it some throttle my ambient pressure climbs from the typical 13.9 to 15.9 every time. And the logical solution was to do the breakout. However, Im not quite sure how to set the tune to support this. After just pluging it all in and turn the ign on the ambient pressure is way off. Im can think of a couple possibilities as to why and figured i would just ask instead of tearing into with a DMM. Is my issue that i would need to be adjusting the AAP1/2 offsets? would i be changing the the map sensor config from NA-MAP-TIAP to NA-MAP-BARO?
i wasnt certain if the ambient temp shared the 5v ref and low ref with the pressure sensor circuit so i had just T-taped those 2 wires with a very good (better than most) soldered connection. My method does not break the original wire but the addition of the device could skew the resistance ever so slightly, but enough to cause issues if it is sensitive enough. I strip a section of the jacket and spread the wire strands into two pairs and insert the tape wire threw the middle the twist the wires together and solder. Without the solder, just the twisted pairs makes such a good mechanical connection, you cant pull them apart. then add solder and its as good as if it was meant to be.
You shouldn't need to change anything in the tune for the breakout. Your solder connection seems solid and you used a 1-Bar map, so you might have connected a wrong wire. I wired a breakout myself using your same method and it worked for me.