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Thread: Cobalt SS Supercharged KR question

  1. #21
    Joe (Moderator) joecar's Avatar
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    Hmmm, weird log, for various reasons (some pids are wrong, MAP/RPM/SPARKADV are cycling in sync with HO2S11)...

  2. #22
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    Yea I am finding the pids do some funny things.

    On a side note I have taken the low octane tables and smoothed the idle area (it had a nasty jump in one spot) I copied the high to low in the idle area and then took out like 3 degrees. Only for idle though. This has seemed to smooth it that much more. Maybe its just me.

  3. #23
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    I know that one of the knock pids are goofy I keep meaning to remove the one that is goofy but I forgot.

  4. #24
    Joe (Moderator) joecar's Avatar
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    Spark does have a large effect on idle stability.

  5. #25
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    Yea it did help some but at temp without any load on the electrical it will still begin to surge although not as bad.

    I wish we had a throttle body scaler parameter I think this would cut down the jerky low load area. The bounce that can get going when trying to accelerate from first to second can be quite annoying lol

  6. #26
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    So I know I keep coming back to this but I figure the more documentation the better it will be for myself and for others maybe looking at similar problems.

    I have noticed what I believe is false knock. It jumps from 0 to 6 and then immediately tapers off to 0 thought a few frames..... This is right when pe activates also.

    I am not commanding alot of timing and have a pretty safe setting in comparison to some others in the ecotec community from what I have researched.

    Other times before pe activates it will begin to log kr but it is also an immediate jump up due to quickly changing throttle like it will be 0 in one frame and 3.2 in the next frame but then immediately back right back down to zero over a couple of frames. I have heard that the ecotec engine is famous for this. Should I not be worried about it since it tapers off immediately even though throttle position and load are not changing? as a general rule of thumb?

  7. #27
    Joe (Moderator) joecar's Avatar
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    If you see it when throttle is suddenly increased, then it might be preemptive retard (aka burst knock retard).

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