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Thread: Adjusting VE idle table

  1. #1
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    Adjusting VE idle table

    Iím looking to lean out my cold start how is that done..I cant seem to get what Iím looking for with the search function. Hereís what I have..B48B96C5-B89E-4C00-A6C0-BA93E3B7FD42.jpg
    Thanks

  2. #2
    Super Moderator Six_Shooter's Avatar
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    Mask, bin, etc that your working with would be good to include, at least mentioning it would be good...
    The man who says something is impossible, is usually interrupted by the man doing it.

  3. #3
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    It’s a chip from fast chips, Ill have to see if I can read it but will it tell me what bin its using?? I’m in the dark here so what ever you can help with will be great. Thanks

    Im guessing $OE or $OD Bin
    Last edited by C2500; 03-08-2018 at 05:26 PM.

  4. #4
    Fuel Injected! dud's Avatar
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    These are the parameters that helped me the most. I had trouble with rich cold starting. Also, when the engine was warm the truck would try to start too fast and cause a "start and stall" situation.

    These parameters are from an $E6 bin. I think $0D and $0E are the same.
    Cranking Parameters.jpg
    Attached Images Attached Images
    Last edited by dud; 03-09-2018 at 11:21 AM. Reason: Forgot Choke AFR.

  5. #5
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    So after getting the VE table acceptable how does that help cold start if there’s an adjustment sort of on these tables??

  6. #6
    Fuel Injected! dud's Avatar
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    As a disclaimer, I have my engine running very well but I've only been doing this for about a year so don't take my word as the definitive answer.

    There are many guys here that are a wealth of knowlege. So I welcome any of them to correct me if I'm wrong on any of this. Just trying to give back a little.

    Studying the "Parameter Comments" for TunerPro settings can be extremely helpful.

    "Crank to Run AFR vs Temperature" is the initial richness the engine needs to get the engine started.

    "Choke AFR vs Temperature" acts as a "choke" to keep the engine running on startup. Acts as a "choke" and "choke pull off" as per the "Parameter Comments".

    "Crank BPW vs Temperture" ; I have "Injector Flow Rate" set at 81lb/hr instead of the stock 61lb/hr because of increased fuel pressure with the stock 5.7 injectors. Changing fuel pressure changes the injectors characteristics some what and I am ASSUMING that's where this comes in. Adjusting this along with "Crank to Run AFR vs Temperature" is the only way I stopped the warm engine stalling problem on startup. I don't know where you would start with this since your using the big block injectors.

    "Choke AFR vs Temperature" is probably what you need to concentrate on the most until you get the Timing and VE tables sorted out.

  7. #7
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    Where did you come up with the numbers you put in there?

  8. #8
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    I probably could say the same about myself in terms of my hands on tuning experience, so I welcome the experts to correct me or throw me a life preserver.

    Those values used can be derived from a fuel injector calculator you can find on the web where you insert your current #/hr, current fuel pressure and new fuel pressure, then you click calculate which returns your new #/hr. With that said, I know somewhere in the venture you had bored out TB w 61#s, talks of running 28 psi spring, BBC throttle body with 45#/74#/80#, had 80#s for sale etc...whatever you are currently running, that bit of information needs to be in the bin. I don't know what dave w did for your starter bin, did he account for the larger displacement as well? All of this needs to be done prior to adjusting any of the VE tables.

    I've neglected to mention that your PCM uses 2 VE tables, off idle and near idle (they may be called other things depends on what they are named in the XDF). Off idle as it name implies is anytime the throttle is opened and that's the VE table that you've been looking at in the other thread you started.

    Anyhoo...the other VE table in which the throttle is closed and you're sitting at idle or decelerating, well these BLMs need to be dialed in as well. This is what I would do to dial in your closed idle is use emulation that your APU1 can provide (another learning curve). I'm not gonna get into the specifics of how to emulate. Important: make sure the bin is setup with the checksum disabled as the first change you make while emulating will send you into limp home. Bring up a dash that displays BLM and INT, incrementally adjust near idle VE table values until your BLMs are at 128. Move on to "no load" spark timing followed by off idle VE.
    Last edited by stew86MCSS396; 03-12-2018 at 01:08 PM.

  9. #9
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    Stew I gave Dave all the specs that I have, Thge injectors are from EBay but who’s to say they are what they are..
    So if injectors are a different size it will sque the results?

  10. #10
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    While it wasn't the correct history table, based on these numbers, you'll be fine.

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