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Thread: 2000 4.3 (test and learn truck)

  1. #171
    Lifetime Member blindawg's Avatar
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    I started out this thread with a V6, but swapped a 2004 5.3 into it, so it is a V8. Lol. Sorry about that.

    Does what you said in your post still apply?

    I do enjoy algebra, but not too sure about the phisics half. I'll give it a look all the same.

    Thanks for the help Joe,
    Branden

  2. #172
    Joe (Moderator) joecar's Avatar
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    Ok, if you have a V8 then the constant in the equation is 15 (actually it's 120/N where N is the cylinder count).


    The problem is that the VE is calculated too high, it might be because DAT is incorrect; DAT should be somewhere between IAT and ECT, and never outside of these.

    Lol, in Physics uses algebra, but you include the units of each term , the units multiply and divide as if they were variables (for example x grams flowing in t seconds results in the flowrate x/t [g/s]).
    Last edited by joecar; January 18th, 2012 at 03:25 PM. Reason: fixed typo

  3. #173
    Joe (Moderator) joecar's Avatar
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    Hi Branden,

    Which build version is your V7 software (do Help->About from the tunetool)...?

  4. #174
    Lifetime Member blindawg's Avatar
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    V7.5.7 Build 180

  5. #175
    Joe (Moderator) joecar's Avatar
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    Ok, good, I'm just making sure

    (a calc_pids.txt bug was fixed a few build versions before build 180).

  6. #176
    Lifetime Member blindawg's Avatar
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    Ok, if you have a V8 then the constant in the equation is 15 (actually it's 120/N where N is the cylinder count).
    Is 120/N in the code you posted earlier? If not, where does it come in at?



    The problem is that the VE is calculated too high, it might be because DAT is incorrect; DAT (Should?) be somewhere between IAT and ECT, and never outside of these.
    How do I go about fixing this?

    once the Problem above is fixed, and the CALC.VET is done, will it fix the backfiring and jerking in the higher RPMs?

    Thanks for the continued help Joe,
    Branden

  7. #177
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by blindawg View Post
    Ok, if you have a V8 then the constant in the equation is 15 (actually it's 120/N where N is the cylinder count).
    Is 120/N in the code you posted earlier? If not, where does it come in at?
    It comes in as the constant 15 (for 8 cylinders) in the equations.

    The problem is that the VE is calculated too high, it might be because DAT is incorrect; DAT (Should?) be somewhere between IAT and ECT, and never outside of these.
    How do I go about fixing this?
    Look at the attachment to post #9 here: Dynamic-Air-Temp-PID-shows-up-as-invalid
    You will have to use the values from your B4901 table (if they are different);
    you have to graft in this new calc pid into your calc_pids.txt file.

    once the Problem above is fixed, and the CALC.VET is done, will it fix the backfiring and jerking in the higher RPMs?
    I don't know, it depends on if the backfiring/jerking is caused by fuel/air problems or by something else.

    Thanks for the continued help Joe,
    Branden
    No worries.

  8. #178
    Lifetime Member blindawg's Avatar
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    Quote Originally Posted by joecar View Post
    Look at the attachment to post #9 here: Dynamic-Air-Temp-PID-shows-up-as-invalid
    You will have to use the values from your B4901 table (if they are different);
    you have to graft in this new calc pid into your calc_pids.txt file.
    I got it grafted in fine, but I'm lost as to what I'll have to do with the B4901 table?

    Thanks,
    Branden

  9. #179
    Joe (Moderator) joecar's Avatar
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    Hi Branden,

    Post your calc_pids.txt file here.

    the pid you grafted in (consists of two items to paste into the calc_pids.txt file, and a rename of the dynamic air temp pids used in the VEN equation) contains a lookup table (consisting of a number of pairs of values)...

    if those pairs of values are different than your B4901 then you have to edit those to be the same as your B4901.

    Post your B4901 here.

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