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Thread: O2 Sensor Clamping with Closed Loop systems

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    Arrow O2 Sensor Clamping with Closed Loop systems

    I was talking to Witt on the phone and he was talking about very late PE Delay like what the j-bodies ECOTEC experience and he brought up O2 Sensor clamping. He also showed me this link from a AEM forum:

    http://forum.aempower.com/forum/inde...html#msg103527

    Does it also have an O2 sensor signal remapper?

    It is very common with modern cars ECUs and piggyback for the two sometimes to fight in a closed loop. I.e. you're just going under boost but in some cases the main ECU still wants to keep the fuel mixture at stoich for some extra time. So, you add more fuel on the piggyback side, the piggyback extends the stock ECU fuel injector open pulses, but the main ECU sees the mixture getting richer (by the O2 sensor) and fights back by shortening its injector pulses. It happens quite a lot with piggybacks in new cars (for emission reasons they get programmed stock to stay much more in closed loop), expecially in transition from cruising to acceleration/boost.

    So, some piggyback controllers (to avoid such lean condition during transition to boost and prevent momentary lack of power/pinging) have the feature to clamp the O2 signal fooling the main ECU that the fuel mixture is still at stoich levels so the main ECU doesn't fight back ...

    Does the new AEM fuel controller have such feature (usually called O2 sensor clamp)? It is very important thing.


    Examples of other brands fuel controllers currently popular on the market you'll be joining:

    Greddy e-Manage Ultimate - look for the feature called "O2 feedback":
    http://www.greddy.com/products/displ...SubCategory=47

    PowerCard Pro - the feature is called "O2 simulated closed loop":
    http://www.powercardtuning.com/produ...pro/index.aspx

    ELF - the feature is called "O2 clamp":
    http://www.stageonetuning.com/index....PROD&ProdID=11
    Thought some of you would have liked to look into this incase you wanted to run a piggyback unit with the J-body or another vehicle with a major PE Delay issue.

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    *Bump*

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    Interesting.....



    If you were premium you could see this...


    Oh & my wiener is bigger than Cheesecake's

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    Hmmm... interesting...


    You're not a real tuner until you blow the fuck out of an ecotec
    bc3tech Quoted Post

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    I am still confused on how PE delay works and how it is degrading performance, i understand that hpt can adjust it.
    2004 Chevy Cavalier FS Complete Part out
    http://www.ecotecforum.com/forums/sh...Out&highlight=

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    I am still confused on how PE delay works and how it is degrading performance, i understand that hpt can adjust it.
    D Rock Z75 Quoted Post
    Power Enrichment Delay is just what it is...it's a delay in your computer system giving richer air/fuel mixtures.

    With a car running a closed loop system, the computer is constantly reading back and forth between the MAF/MAP and the O2 Sensor trying to constantly maintain a 14.7 a/f ratio. When you hit power enrichment, it's supposed to ignore (I believe) the O2 sensor feedback and give richer mixtures. The problem is that the delay is a matter of seconds but those seconds of you running 14s a/f can be a matter of your engine blowing if you're running forced induction. Power enrichment is supposed to occur when you get pass a certain throttle position (it might differ between each vehicle).

    Hopefully I said that correctly.

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    Ah I remember that phone call.

    The AEM FIC (the original post quoted that forum) can not only o2 clamp but skew o2 signals to correct fuel trims. This allows tuning stoich conditions without worrying about MAF compatibility or MAP-MAF correlation errors for the electronic throttle guys.

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    Ah I remember that phone call.

    The AEM FIC (the original post quoted that forum) can not only o2 clamp but skew o2 signals to correct fuel trims. This allows tuning stoich conditions without worrying about MAF compatibility or MAP-MAF correlation errors for the electronic throttle guys.
    Sounds really cool

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    GM Reflash yay.lol

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    with HP tuners you can lower PE to whatever RPM threshold you want to start at .i think it starts at 6200 stock but you can drop it down to 0 if you want to .i set mine to go in to PE at 2500 RPM , thats where i start making high boost .works well .

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