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Thread: Custom OS to get rid od VVE table tuning

  1. #1
    Lifetime Member Boost's Avatar
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    Default Custom OS to get rid od VVE table tuning

    Is this possible? Looking at a 07.5 2500 gasser. Would like to flash an OS into it to allow for easier adjustments without the virtual stuff. Thanks
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  2. #2
    Forum tyhee Site Admin GMPX's Avatar
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    No we never went down that path. HPT initially did but then I think they stopped that and now switched back to VVE as well. Yeah it is harder to deal with but the system is better in some ways than just a plain old VE table.


  3. #3
    Lifetime Member Tre-Cool's Avatar
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    yep and if you open up a efilive vve tune with hpt's vve it's completely messed up as they are using simplified kpa arrangements.

    hell, you dont even need to make a change to the tune, just reflash with hpt and the car will run rich as. lol

  4. #4
    Joe (Moderator) joecar's Avatar
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    lol.

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    Quote Originally Posted by Tre-Cool View Post
    yep and if you open up a efilive vve tune with hpt's vve it's completely messed up as they are using simplified kpa arrangements.

    hell, you dont even need to make a change to the tune, just reflash with hpt and the car will run rich as. lol
    That seems really strange unless they silently change data in the cal after opening.

  6. #6
    Lifetime Member Tre-Cool's Avatar
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    thats what i thought. but could repeat it on an e67. soon as i flashed the same tune back with efilive. start up and mixtures are spot on.

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    did you try flash it with HPT, then read out with EFILive and compare?

  8. #8
    Lifetime Member Tre-Cool's Avatar
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    nope. we did it because the owner of the car had a hpt cable and mentioned that the car was running real rich after he made a small change. so once i was done tuning it with efilive. i read it out with his cable. flashed it back. car was running .87 lambda everywhere.

    flashed it back with efilive. spot on at 1. until pe was required.

  9. #9
    Forum tyhee Site Admin GMPX's Avatar
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    Reverse calculating the VVE is pretty hard and we do ours in a way that works around a bug GM have in the E38 & E67 VVE code.


  10. #10
    Lifetime Member minytrker's Avatar
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    I tuned my VVE in my G8 and a couple C6 Z06's (E38) in EFI Live then read it out in HPT, then made changes in HPT and read it out in EFI. I used whatever I happened to have out and never had an issue going between the two. HPT makes its have a LS1 style looking VE which seems easier for some people started out but EFI VVE has always worked awesome for me.

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