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    safc neo problem

    i have a safc neo and i have come to find that if i have the o2 sensor plugged in that the ecu just adjusted itself when i try to add or subtract fuel. so the safc doesnt really seem to do anything unless i unplug my o2. then i can do what ever i want without the ecu correcting it. i was wondering if any of you have had this problem. o ya i have a innovate motorsports wideband if that makes a difference.
    92 pro

    #2
    how did you come to the conclusion that the ECU what compensating for the piggy backs adjustment from the O2 sensor?

    many people have worked various piggybacks without this issue on our cars so imn alittle curious as to the details
    "Discontent is the first necessity of progress."
    -Thomas A. Edison

    "There is a fine line between ballin' on a budget, and dreamin' on an empty wallet."


    *Junked* 92 mx3, BP swap- milage whore, beaten up and down the east coast
    *Junked* KLZE powered 323 on Megasquirt 1
    172.60HP & 156.93 TQ with only headers and short ram intake. back under the knife for a BPT swap.
    New Daily stock 1.6L 1999 Mazda Protege LX

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      #3
      i watch my wideband. with the o2 plugged in at idle I will richen it to say 12.5:1 or lean it out which ever way with the safc then after say less then a minute the afr will return to 14.5 or so. if i unplug the 02 sensor i can set the afr where ever and it will stay there. the way i look at it is that with the o2 unplugged the ecu has to go off the info that it is given from other sensors. but when it IS plugged in the o2 sensor has the final say in what to do with the fuel.
      92 pro

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        #4
        so is the o2 sensor anygood its not just stuck or moving slowly?
        92 protege lx-

        94 protege lx-

        95 escort gt-ms2e/ms2extra pre3.3alpha5 gslender v2.8-e85-vj23@12lbs----dead--

        are you a thinker, or a believer?

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          #5
          ya the wideband is brand new it is working properly. it has a hook up for a narrowband o2 sensor
          92 pro

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            #6
            Let me clarify this.

            The stock ECU during non WOT (high load) conditions will compensate fueling (either add or reduce) such that the car runs stoich. This is desireable. You don't want the SAFC to interfere with this function as it is working properly. However, under high load conditions the stock ECU no longer listens to the O2 sensor. This is where you want to perform your tuning such that the ECU is fooled by the VAF signal modified by the SAFC and you have some room to play with on the fuel side of things.

            So leave the O2 plugged in the stock harness, stoich under low load conditions is what you want.

            Also note, there is a limit to what the stock O2 can do. If you modify the VAF signal too drastically, it will go into open loop at low load conditions and either run very rich or very lean.

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              #7
              cool thanks i will check this out. i am getting ready to turbo my car this weekend so i needed to know that i was gunna be able to control my fuel.
              92 pro

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                #8
                i tried it and it is working the way you said. idle and really low throttle i cant control but beyond that i can. thanks again for the info
                92 pro

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                  #9
                  Originally posted by tylerroy View Post
                  i tried it and it is working the way you said. idle and really low throttle i cant control but beyond that i can. thanks again for the info
                  No problem, glad to help.

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