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Thread: Calc.VET: correcting MAF and calculating VE (in single log)

  1. #361
    Joe (Moderator) joecar's Avatar
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    Ok.

  2. #362
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    Just done done a Calc VET and things look good except my Idle, my idle is rich when cold, around 12.5 then goes up to around 14.5 when warm. I've also noticed that when slowing down my revs drop quite low but the motor doesn't stall. I didn't think a Calc VET would affect idle since you filter out cells below 800 rpm, I do see one cell at 800rpm-60kpa. Do I need to re tune Idle, I've also attached a copy of my Calc VET log.

    Thanks!!
    Attached Files Attached Files
    Last edited by pormgb; September 11th, 2011 at 11:31 AM.

  3. #363
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    Default Newb question

    I must be doing something completely wrong.

    6. Update Calibration, steps:

    8. Select all cells in the table by clicking in the extreme top-left grey cell, then right click and select
    Copy with labels (Shift+Ctrl+C).
    9. Switch back to the EFILive Tuning Tool.
    10. Open calibration {B0101} "Main VE Table".
    11. Right click on any cell and select Paste->Paste with labels (Shift+Ctrl+V).


    When I follow step 11, it completely jacks up my VE table because it replaces the VE values with the values from the CALC.VET map.

    My CALC.VET map looks similar to the example shown on page 1.

    Click image for larger version. 

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    My VE table looks like this.

    Click image for larger version. 

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ID:	11891

    Please tell me I just overlooked something very simple.

    Thx.
    Last edited by wcj; September 8th, 2011 at 06:09 AM.

  4. #364
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    You must use the same unit g*/kpa or % in the tun ve table and in the log table.

  5. #365
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    Quote Originally Posted by tor1965 View Post
    You must use the same unit g*/kpa or % in the tun ve table and in the log table.
    So if I understand it correctly, my VE is in % while my CALC.VET map is in g*/kpa? Does it require a relog or would a map change correctly adjust the necessary map values?

  6. #366
    Joe (Moderator) joecar's Avatar
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    A relog is not required (the reason being that calc pids are involved, these can be edited and recalculated on the same log).

    You could either of these:
    - change the map data pid to CALC.VET.%,
    - change the tunetool to display VE in g*K/kPa (see Edit->Properties).

    If you use % units, you also have to enter engine displacement (see Edit->Log File Information)(be sure to save file after entering displacement in cc).

  7. #367
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    Ok, gotcha! Got it sync'd now. Thanks!

  8. #368
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by pormgb View Post
    Just done done a Calc VET and things look good except my Idle, my idle is rich when cold, around 12.5 then goes up to around 14.5 when warm. I've also noticed that when slowing down my revs drop quite low but the motor doesn't stall. I didn't think a Calc VET would affect idle since you filter out cells below 800 rpm, I do see one cell at 800rpm-60kpa. Do I need to re tune Idle, I've also attached a copy of my Calc VET log.

    Thanks!!
    Ok, you will have to work thru idle tuning to fix the rev stalling:


  9. #369
    Member MadMaxHSV's Avatar
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    Anyone tried this with an E38?

    Few tweaks would be require to the method of course...

  10. #370
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    The AutoVE and AutoMAF techniques work well with the LS1-B PCM - the CALC VET and CALC MAFT techniques are an extension of these. You may have success in using the AutoMAF technique to dial in the MAF on an E38. Both LS1-B and E38 MAF tables could be described as two dimensional - Frequency & Air Mass Flow.

    However the VE tables are very different. These both appear as three dimensional tables - RPM & Manifold Pressure & VE. The LS1-B PCM uses a basic mathematical equation to calculate predicted airflow. The E38 uses a highly complex algorithm to do the same.

    When viewing an LS1-B VE table you can easily conceptualize what the cell values mean (especially if set to display in percent). In the E38 VVE table the cell values are at best conceptualized as placeholders - with no immediate mental conversion to VE.

    Even when using Swingtan's VVE Tutorial technique - you will have noticed that using a BEN factor may fail to yield the desired results - and some manual manipulation of the VVE table (based on accurately interpreting logged data) is often more productive.


    Regards,
    Taz

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