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Thread: Strange numbers in knock table

  1. #1
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    Default Strange numbers in knock table

    I made a table for knock with my GM knock pid and it only shows all 0.00. I used the maps supplied in the software for table 5913 and 5914 and get numbers that look like they are the amout of grams it would like to see in the table in the advanced table? In the retarded table they are all 0.00

    I was expecting numbers like 1.0, 3.5 for knock and to subtract those values from the tables but when almost all in log are 33.0 29.0 27.2 it really looks like it is telling me this is the grams it is using not the amount of knock?

    Thanks for any help

    Louis

  2. #2
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    Default Here is a screen shot of my knock map

    I was expecting to see 1.0, 3.5 etc not grams
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  3. #3
    Joe (Moderator) joecar's Avatar
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    Louis,

    Each cell of that map is Spark Avdance in degrees, the rows are indexed by engine speed in RPM, the cols are indexed by cylinder air mass in grams/cylinder (the row/col title/units has a light blue background stripe);

    That map mirrors the spark advance tables B5913 and B5914;

    that map is correct, each cell of that map (and those tables) is the commanded ignition timing (degrees) before any "modifiers" subtract/add from/to it.

    Cheers,
    Joe


  4. #4
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    Default timing table

    Hello and thank you for your reply.

    I am aware what this uses in the column and rows but my question is first do I use these figures to add them into the B5913-B5914 yables and replace the figures that are there?
    Second is I was expecting modifiers to be showing here so I can correct those tables by subtract/add from/to it.

    I made a gm knock table and was assuming this would give me the modifiers if the table above did not but all I got in that gm knock table were all 0.00. I looked everywhere for an example of this to make sure I have the right data but could not find anywhere.

    The pids I used for my gm knock were data = gm knock
    column =airflow grams/cyl-speed density and row=rpm

    PLease explain how I am suppose to see the modifiers if this is wrong.

    Thank you for your time

    Louis

  5. #5
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    Louis, make an exact copy of the map you posted above except replace the data PID with GM.KR instead of DYNCYLAIR_DMA and you should get (assuming you have GM.KR selected for logging in F7) a map that gives you a window into where in the spark table you are seeing knock retard.

    I would be reluctant, though, to simply use that as a modifier because knock isn't a consistent thing. Instead, I'd look at each occurance of KR and see what was happening at that specific moment.
    2004 Pontiac GTO - Quicksilver/red/m6
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  6. #6
    Joe (Moderator) joecar's Avatar
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    The map for KR (gram/cyl vs rpm) is what you subtract from B5913, B5914
    (assuming your AFR at those points was suitably rich; if it's lean, fix it);

    Turn off the AutoVE log filter;

    On the KR map, check which button is pressed:
    - average (x with bar above it)
    - minimum (down arrow)
    - maximum (up arrow)

    Press the maximum button and see if the map shows non-zero KR;

    If KR is still zero (have you turned off the log filter...?), then zero knock must have been "sensed".

    To log the spark modifiers, you have to log some combination of the pids whose names start with "EST_" (as in Electronic Spark Timing").

    Cheers
    Joe

  7. #7
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    Default Here is gm knock map

    I see all 0s, no filters are on and when I hit show min or max values still zeros. I have avg on and these are table fields

    data=retard due to knock
    column=airflow gms/cyl
    row=rpm

    The only pid I see that would relate to this with est in it is est_krb_dma estimated burst knock retard. Not sure if I should be using this or gm-kr retard due to knock?

    Thanks for all the help gentlemen

    Louis

  8. #8
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    Is it possible that you are truly just not knocking? I mean, you really would like to see zero knock retard, right?

    Post a log file, maybe?

  9. #9
    Joe (Moderator) joecar's Avatar
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    Can you hear any knock...?

  10. #10
    Lifetime Member jfpilla's Avatar
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    Here's another way to set it up.
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