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Thread: E38 VVE Setup Guide

  1. #91
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by jmsmotorsport View Post
    Also once in OL does the engine run only in the low octane spark table like the ls1?
    No, it runs from both (adaptive knock retard).


    EDIT: BUT in SD it runs from the LO spark table only, regardless of CL/OL.
    Last edited by joecar; February 10th, 2016 at 04:00 AM.

  2. #92
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by jmsmotorsport View Post
    You say mafless you just leave the maf failed? I'm still able to be mafless and run my LTFT and STFT is this correct?
    Yes, correct.

    So would this make it a CL SD Tune?
    Yes, correct, CLSD or SDCL.

    And by being in CL with STFT active will account for IAT temp changes? Sorry if this seems dumb.
    VE is a combination of cylinder actual-fill airmass normalized for temperature and pressure (using the Ideal Gas Law from Physics class)...

    and the VE table is looked up and/or calculated using MAP as one of the parameters...

    so, if injector tables are correct, and other things line up, then SD tune will work when pressure and temperature change...

    now, in the real world, sometimes it does not work for various reasons... but there are many instances of various people's SD tunes working fine, even with altitude change.

  3. #93
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    Quote Originally Posted by joecar View Post
    No, it runs from both (adaptive knock retard).
    Ok so when tuning timing I only need to alter the high octane table and leave the low octane only as a safe guard.

  4. #94
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    Quote Originally Posted by joecar View Post
    Yes, correct.


    Yes, correct, CLSD or SDCL.


    VE is a combination of cylinder actual-fill airmass normalized for temperature and pressure (using the Ideal Gas Law from Physics class)...

    and the VE table is looked up and/or calculated using MAP as one of the parameters...



    so, if injector tables are correct, and other things line up, then SD tune will work when pressure and temperature change...

    now, in the real world, sometimes it does not work for various reasons... but there are many instances of various people's SD tunes working fine, even with altitude change.
    I have found that the IAT temp doesn't cause to much AFR drift until around the 53 degree up range so I am going to sort this out first before going any further with my VVE tuning. Initially when checking this at the start I could only get the IAT to 50 through heat soak and didn't think it was an issue but after a hotter day and higher IATs it's become an issue.

  5. #95
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    Ok have started doing the IAT correction, it swung out to 15.40/15.50 and commanded is 14.55 @ 60 degrees c so I applied the correction and am fine tuning but I noticed while watching the w02 that when I turned the AC on or off it changed my AFR buy around .5 so the question is do I correct the IAT with AC on or off?

  6. #96
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by jmsmotorsport View Post
    Ok so when tuning timing I only need to alter the high octane table and leave the low octane only as a safe guard.
    I should have been more precise:
    OL: runs adaptive spark (i.e. both HO/LO tables).
    SD: runs LO table only (for LS1B you would need a COS to run HO/LO).


    If you're running MAF then yes edit the HO table only.
    If you're running VE/SD then copy HO to LO and edit LO.

    If you're running a COS (LS1B), then VE/SD uses HO/LO.

    I don't know how this is handled in E38/E67 (there's no COS).
    Last edited by joecar; February 10th, 2016 at 04:01 AM.

  7. #97
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    Cheers for clearing that up joe.

    Now my IAT tuning, commanded is a fair bit off actual AFR while idling away heat soaking but since modifying the Injector factor the AFR doesn't creep as IAT temp rises, I understand that is now fixed, correct? And now I have to dial my VE in to get it back to commanded?

  8. #98
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    Original - Don't mined the huge jump at the start, turned AC on. But you can see as IAT was rising the AFR marginally drifted.

    Updated - After ECT came to temp and Commanded AFR settled at 14.55 the AFR never drifted from 13.30 as the IAT rose.

    I will need to check this all again once temps cool down, start up IAT is already at 34. But at this stage I am satisfied that IAT temp wont affect me BEN MAP while logging out on the road to dial my VVE in.
    Attached Files Attached Files

  9. #99
    Joe (Moderator) joecar's Avatar
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    I should have been EVEN more precise:

    - runs HO/LO adaptive spark when there are no MAF DTC's, regardless of CL/OL.
    - runs LO table only when MAF DTC's are present (and possibly other DTC's), regardless of CL/OL.

    so then:
    OLMAF and/or CLMAF: runs adaptive spark (i.e. both HO/LO tables).
    OLSD and/or CLSD: runs LO table only.

    for LS1B, in SD, to run HO/LO adaptive spark, you would need a COS.

  10. #100
    Joe (Moderator) joecar's Avatar
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    Also, does the pid SAE.LAMBDA work...?

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