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Thread: CALC VET Summary Notes

  1. #1
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Default CALC VET Summary Notes

    In-Memory-of-Shawn-Sankey


    Tuners Checklist:
    Mechanical-Issues-that-prevent-Good-Tuning

    I. Validate Pids:

    1. Connect Scan Tool to your Vehicle (Select Controller)
    2. Turn Ignition Key to 'On'
    3. Scan Tool>>Info>>Validate Pids


    II. Scan Tool Set-Up

    1. Creating Pids
    http://download.efilive.com/Tutorials/Interactive/How to Create a PID List.htm


    2.
    Creating Maps
    http://download.efilive.com/Tutorials/Interactive/How to Create a Map.htm

    Please also do this: on each of the Data, Row, Col tabs checkmark Show Units.

    3. How to copy and paste.

    http://download.efilive.com/Tutorials/Interactive/How to Copy and Paste with AutoVE.htm

    4.
    Map Filters
    http://download.efilive.com/Tutorials/Interactive/How to create a filter.htm


    Note: when copying a map from the scantool, always use copy-with-labels, and then in the tunetool use paste-with-labels or paste-multiply-with labels (whichever is appropriate) to modify the target table.

    III. CALC.VET Tuning Tips

    1.
    B0701: Disable Catalytic Converter Protection
    Insures accurate stoich and PE mode/WOT Fueling

    2.
    B0120: Change RPM Threshold for Airflow Calculation from 4000 to 400
    Eliminates any Airflow Correction/Contribution from the VE Table
    (if your transient filter is sufficiently wide, it will filter out VE contribution)

    3.
    B3308: Disable DFCO: Change B3308 (M6) to 140C Change B3313 to 140C
    Accurate fueling computations

    4.
    B4105: O2 Switch-points to 450 Millivolts
    Smoother MAF & VE Table

    5.
    B3618: PE Modifier Based on Rpm: EQR 1.16
    Safe adequate Fueling regardless of Fuel Type

    6. B3616: PE Enable: make sure PE enables as load becomes significant
    (e.g. below 60% TP below 3200 rpm, 35% TP above 3200 rpm).

    7. B3608 and B3609: PE Delay: set these to zeros.

    IV. Logging Techniques:

    45-60 minute log is best. Allow Engine to warm to normal operating temperatures before logging. Include Idle, cruise, acceleration, deceleration, and WOT. Apply as much steady throttle as possible. Avoid 'jackrabbit' starts and rapid braking. Use lower gears to hit higher Rpms and lower Maps if desired.

    PE Mode/WOT:

    PE Mode is best performed utilizing 100% TPS (WOT). This is because a number of Fuel Dynamic Parameters are kept steady and constant (evaporation, cylinder wall-wetting, etc). Also, a steady 100% TPS insures accurate computation of the MAF Airflow. Avoid part-throttle PE Mode Tuning.


    V. Blend MAF and VE Tables

    The first time you are Tuning via CALC.VET you will be pasting your new Values into B0101. You must 'blend' those values into your existing VE Table. Manual smoothing is superior to 'computer' smoothing. However, the first few logs it may be appropriate to utilize the
    EFILive 'Smoothing' Tool. You may also smooth using the 'Smooth cells without decreasing the min/max range' Smoothing Tool alone or in combination with the above Smoothing Tool.

    Tips for VE Table Smoothing:

    1. Adequate Cell Count (45-60 minute log).

    2. Proper Data Filters
    3. Steady State Throttle
    4. Driving techniques.
    5. VE Table Values generally rise as Rpms, MAPS increase. The peak VE Values will mimic your Torque curve. For a LS1 highest VE Values are generally found at 4800-5200 Rpms.
    6. Eliminate Spikes.
    7. Manually interpolate for areas you can not hit. This is essentially important for RPMs' below Idle (400) and above 6400 Rpms..

    Blended VE Table B0101
    :
    Normalized to 100%.

    Note: General VE Table Smoothing Rule: VE Values almost always increase with RPM/MAP

    MAF Table Smoothing:


    Normally the MAF Curve will slope exponentially from 1500-12,000 Hz in a smooth fashion. You can view this on the Two-Dimensional chart found on Table
    B5001. Occasionally when logging SELBENS the MAF Curve can become a little jagged. You might want to manually 'smooth' those cells using the two-dimensional graph. You want to eliminate spikes and keep the curved function relatively smooth.

    The second technique is average your existing
    SELBENS over the entire curve. This insures a natural slope and will produce better results.

    Blended MAF Table B5001




    Note: Keep this MAF Curve as smooth as possible. No jagged points or spikes.
    You must extend the MAF Curve to 12,000 Hz for accuracy.

    Closed-Loop MAF Tuning/Blending (No Wideband):

    When performing a Closed-Loop MAF Calibration, normally only those MAF frequencies below 7000-8000 Hertz are adjusted. This leaves the MAF Frequencies above 7000-8000 Hertz totally 'uncalibrated'. A technique to estimate the upper portion of the MAF Curve is to add the Average of the LTFT1 and LTFT2 Banks (LTFTAVR), and apply that percentage to the upper portion of the MAF Curve.
    If done correctly the entire MAF Curve will have the same slope from 1500-12,000 Hz.

    Table B5001 Example




    Note: Keep this MAF Curve as smooth as possible. No jagged points or spikes.
    You must extend the MAF Curve to 12,000 Hz for accuracy.

    VI. Refining your CALC.VET Tune

    1. Reset LTFT Trims:Connect Scan Tool to Vehicle >>Ignition Key On>>Calibration>>Long Term Fuel Trim Cells>>Reset

    2. Eliminate Positive Trims:
    The PCM will add Fuel to PE Mode/WOT if LTFT's are positive. You can eliminate them by adding +1 to +2.5% to All Values in the MAF Curve. Then Tune PE Mode/WOT using SELBENS.

    3. Eliminate Knock Retard:
    Best to use Dyno to find optimum spark and eliminate KR. For street, eliminate KR by reducing Spark to a value -2 below KR threshold.
    Example LS1 Spark Table:
    Idle-Tips-amp-Tricks

    4. Idle:
    See LS1 Idle Tips & Tricks:
    Idle-Tips-amp-Tricks


    VII. Additional Notes

    Calc.VET vs Calc.MAFT
    Mode Relationships
    Semi-Open Loop Mode
    IFR Calculations


    ( those are contained in this thread: Summary-Notes )
    Last edited by joecar; December 3rd, 2015 at 12:10 PM. Reason: Added section VII
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  2. #2
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    The following is from post #29 of
    Summary-Notes


    Serial wideband:
    anywhere that a BEN is required, use this as the new BEN: WO2BEN = {GM.EQIVRATIO}*{EXT.WO2LAM1}
    (i.e. change any BEN maps to use this and save with new filename).

    Analog wideband:
    you have to modify the WO2BEN pid to use the analog wideband lambda, e.g. WO2BEN = {GM.EQIVRATIO}*{CALC.AFR_LC11}/14.7
    (i.e. change any BEN maps to use this and save with new filename).

    Shawn's Calc.VET Tutorial and Calc.MAFT Tutorial contain calc_pids.txt files that define WO2BEN for serial wideband
    (and they also show how to define WO2BEN if you're using analog wideband).


    Explanation/comparison of various tuning procedures:

    AutoVE:
    - disable CL/LTFT,
    - disable MAF (make sure MAF DTC is present),
    - set PE safely rich to protect motor,
    - capture log,
    - create a WO2BEN map that matches B0101 (hint: copy the VE table, then in the map row/col properties click Paste Label),
    - apply transient filter to map,
    - paste-multiply map to B0101.

    AutoMAF:
    - disable CL/LTFT,
    - enable MAF (make sure DTC goes away),
    - set B0120 to zero to disable VE,
    - set PE safely rich to protect motor,
    - capture log,
    - create a WO2BEN map that matches B5001 (hint: copy the MAF table, then in the map row/col properties click Paste Label),
    - apply transient filter to map,
    - paste-multiply map to B5001.

    Calc.MAFT:
    - same as AutoVE (corrects VE) but also simultaneously calculates MAF (from corrected VE),
    - can be done with or without CL/LTFT,
    - create a map for CALC.MAFT and paste this into B5001.

    Calc.VET:
    - same as AutoMAF (corrects MAF) but also simultaneously calculates VE (from corrected MAF),
    - can be done with or without CL/LTFT,
    - create a map for CALC.VET and paste this into B0101.

    Note:
    when you do Calc.VET or Calc.MAFT be aware that positive trims are added during PE,
    this has the effect of making the wideband correction ineffective,
    so you may want to add the trims to the table that is being corrected (only for PE)
    --> I'm going to make a calc pid which will add positive trims if I can figure out how to detect PE in the log.

    Shortcut: while doing AutoVE, log GM.DYNAIR, and make a B5001-like map of GM.DYNAIR, multiply it by WO2BEN, apply the transient filter, paste into B5001 as an initial MAF estimate (but note that Calc.MAFT and Calc.VET will do a better job).

    Relationships:
    - AutoMAF is a special case of Calc.VET.
    - AutoVE is a special case of Calc.MAFT.

    Note: Calc.VET and Calc.MAFT can be done with CL/LTFT disabled (in which case you use strictly WO2BEN).

    SELBEN:
    SELBEN is a combination of LTFT and WO2BEN, but you can restrict it to only WO2BEN as long as you disable CL/LTFT.

    WO2BEN:
    WO2BEN is the wideband BEN, you use this with disabled CL/LTFT.

    Concept/Intent (what they do):
    -
    Calc.VET corrects MAF and calculates VE from corrected MAF (with VE disabled).
    - Calc.MAFT corrects VE and calculates MAF from corrected VE (with MAF disabled).

    Note:
    - the thing being calculated has to be disabled,
    - the thing being corrected has to be enabled
    .

    The word "corrects" indicates "corrected by multiplying by BEN factor".
    The word "calculates" indicates "calculated using the physics equations".

    Calc.MAFT is aka Reverse Calc.VET (you can see this when you compare the pids CALC.VEN and CALC.MAFN).

    Pay careful attention to:
    - is PE safely rich to protect motor,
    - is PE enabled correctly to activate at significant load,
    - is CL/LTFT enabled/disabled,
    - is MAF enabled/disabled,
    - is VE enabled/disabled,
    - what pid is being used for BEN,
    - do units match between scantool and tunetool,
    - was the transient filter applied,
    - avoid using GM.AFR for anything other than display,
    - keep pid channel count at 24 or less (to maintain fastest frame sampling rate).

    Check that post for any updates.
    Last edited by joecar; August 13th, 2013 at 02:03 PM. Reason: fixed joe's typos
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  3. #3
    Joe (Moderator) joecar's Avatar
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    Everyone/Anyone: please take the time to read the Summary Notes... they will save you from getting into a hole.
    Last edited by joecar; January 23rd, 2013 at 01:55 PM.

  4. #4
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    Just copied post #1 in it's entirety into a Word document ... into the tuning binder it goes ...

    Thanks to WeathermanShawn and Joecar for conceptualizing / developing / implementing this tuning method.


    Cheers,
    Taz

  5. #5
    Joe (Moderator) joecar's Avatar
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    Thanks to Weatherman for thinking it up, putting it down in writing, and refining the written materials

  6. #6
    Joe (Moderator) joecar's Avatar
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    The relationship between Calc.VET, Calc.MAFT, AutoVE, AutoMAF is in this thread: AutoVE-questions

  7. #7
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Joecar, I liked your Summary so much, I put it post 2 of the CALC.VET Summary Notes: http://forum.efilive.com/showthread....l=1#post145259

    Perhaps the next project would be a Thread/Summary: Which Tuning Method do I use..AUTOVE, AUTOMAF or CALC.VET..it could have a description of each Tuning method..advantages, disadvantages, etc..Then an user could have more information to help decide.
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  8. #8
    Joe (Moderator) joecar's Avatar
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    Shawn, thanks I knew you would like it

    I saw people asking what is the difference between all the tutorials so I needed a summary to explain everything
    [ notice I applied what we learnt about PE ]

    I edited post #2 to correct some typos

  9. #9

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    Quote Originally Posted by WeathermanShawn View Post

    I. Validate Pids:

    1. Connect Scan Tool to your Vehicle (Select Controller)
    2. Turn Ignition Key to 'On'
    3. Scan Tool>>Info>>Validate Pids
    [/COLOR][/SIZE][COLOR=black]
    Help please for a newbie from the UK... I get as far as 3. but my flashscan V2 has no >> info

    my options are

    F1 Select Pids
    F2 Data Logging
    F3 Scan Options

  10. #10
    Lifetime Member wesam's Avatar
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    Could any body tell me why to
    avoid using GM.AFR for anything other than display
    ?
    EFILive Tuner

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