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Thread: Filtering DFCO Cells

  1. #1
    EFILive Crew Site Admin Tordne's Avatar
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    Default Filtering DFCO Cells

    Anyone know of a PID that can be logged that indicates when DFCO is active. I have looked and there doesn't appear to be one... I was hoping there may have been a State PID or something.

    Because of the way in progressively comes in and out I am finding it quite had to filter out cells where DFCO is in effect. The effect of DFCO on BEN factors is obviously huge cause it shuts the fuel and the WB pick this as a sever lean condition

    Can a State PID be created if it doesn't already exist?

    Cheers,
    Andrew
    EFILive Crew


  2. #2
    Joe (Moderator) joecar's Avatar
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    Is DFCO indicated by {GM.FTC} == 21 ...?

  3. #3
    EFILive Crew Site Admin Tordne's Avatar
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    DFCO will occur in FT Cell 21, but so will other driving conditions, for example cruising and maintaining 60km/h say. So simply removing FT 21 cells won't do what I want.

    I am commanding 15.4:1 AFR in low MAP cells as well, so I'd like to be able to remove the DFCO affected cells and just tune those cells that were actually used in non DFCO conditions.

    I have tried a number of things to try and remove DFCO cells, like:
    - Removing low TP% cells
    - Removing cells with low spark advance (DFCO removes and reintroduces spark as it comes into and out of effect)
    - Low Injector Duty Cycles, cause it basically shuts off the injectors
    - Filter out high AFR's > than say 17.5

    All of these do help to some degree, but there are still enough DFCO affected cells to pollute the BEN factors.

    I was hoping that there was going to be a State PID tat I could simply log to e like a Boolean switch for DFCO active/inactive.
    Andrew
    EFILive Crew


  4. #4
    Forum tyhee Site Admin GMPX's Avatar
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    Look at the MAP/RPM value it kicks in and filter the log for any numbers below that, afterall, you don't need to get that area right as the fuel is off!.

    Cheers,
    Ross
    Need official EFILive help, please go here.
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  5. #5
    EFILive Crew Site Admin Tordne's Avatar
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    Thanks Ross,

    I still find though that there are cells in the log below the DFCO enable map etc. that are valid and DFCO was not active. I'd like to be able to filter out all cells where DFCO was active or becoming active/inactive.

    I can send you a log if you like?

    Cheers,
    Andrew
    EFILive Crew


  6. #6
    EFILive Crew Site Admin Tordne's Avatar
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    Quote Originally Posted by joecar
    That makes sense.

    Is this overdoing it:
    MAP < 20kPa and TPS == 0% and DTC == 21
    I have tried that and more, but it is a real prick to get rid of all the cells, without losing ones you still want to retain. That is why it would be good to have a State PID tat is a simply Boolean value.

    I can hear people saying "just turn DFCO off", but it has a couple of benefits IMO. One is obviously fuel economy, and at today's fuel prices that is good (just paid NZ$107 to fill with 98 octane - ouch). The second thing I like is the engine breaking effect when the fuel and spark is cut.
    Andrew
    EFILive Crew


  7. #7
    Joe (Moderator) joecar's Avatar
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    Originally Posted by joecar
    That makes sense.

    Is this overdoing it:
    MAP < 20kPa and TPS == 0% and DTC == 21
    I somehow deleted my post (...I'm having a day...).

    (just paid NZ$107 to fill with 98 octane - ouch).
    Ouch.

    Yeah, a state pid or bit would be nice.

  8. #8
    EFILive Crew Site Admin Tordne's Avatar
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    Quote Originally Posted by joecar
    I somehow deleted my post (...I'm having a day...).

    Ouch.
    Given that I drive my car that gas will probably last 6-7 days, then ouch again :( The price here is not nearly as bad as in the UK. They are really loaded with taxes.
    Andrew
    EFILive Crew


  9. #9
    Joe (Moderator) joecar's Avatar
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    It's sad that governments have to load people down with high taxes.

    Joe

  10. #10
    Forum tyhee Site Admin GMPX's Avatar
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    Worst part is most of the Australian Government cars are Statesman's with LS1's in them!!, who cares when someone else pays!!.

    I don't think there is a fuel state PID, I'll take a look anyway.

    Cheers,
    Ross
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


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