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Thread: Help! '94 3.4L Datalogging

  1. #31
    RIP EagleMark's Avatar
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    Quote Originally Posted by RobertISaar View Post
    possibility. i don't know enough about the concept to be certain.
    here is what they look like raw:
    3.4

    3100


    now, the 3100 got significantly better heads, yet is shown with smaller values. they both use the same injectors even. there is no conventional BPC value in the calibration either(or injector flowrate or cylinder size or......), but there is one that seems to be hidden in the algorithm, i believe it is also a 16 bit value, even though it's the same between a 3.4 and 3.1.

    these, if you were to use the normal X*(100/255) VE% conversion come out to 400+% range...

    i just look at the logs and change each cell by a number that i feel is safe to get them in line.
    In the end if you make changes by percent it usually works out no matter what the VE table is based on.

    Like an EFI Live VE Graph table based on "Grams*Kelvin/kPa"
    lokks the same as a
    TunerCat Graph table based on "Grams Per cylinder".

    The values is this table are expressed in grams per cylinder per second. These values can be converted to %VE which was used in earlier calibrations using the following formula:

    %VE = 0.2871 x VE / CV

    where VE is the value from the table and CV is the volume a one cylinder in liters.
    And if you use conversion of just VE %? The table in Graph view still looks the same. So no matter what it is based on? It's still just VE!

    I got stuck on EFI Live VE table based on "Grams*Kelvin/kPa" because it was easier to use with Scan Tool PIDS. Originally I changed preferences to VE% that I was used to using but then had to build PIDS for it...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  2. #32
    Electronic Ignition!
    Join Date
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    So....what's E-side and T-side? Haha!


    I've done a little tweaking in the Main VE table with tunercat...that table shoes empty with tuner pro. I didn't feel like copying and pasting a thousand times so I just used TC to see how the PCM responds to different changes in the VE values. Seems to idle better, I bumped the whole table up by 2%. I'm going to find a guy with a dyno this week to see if my "tuning" has done me any good or if it's just hurting it.


    That is, after I replace all those stupid sensors!

  3. #33
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    official terms from GM were "event" and "timing" sides..... but they also happen to correspond to engine and transmission as well.

    shouldn't show as empty in TP.... BIN loaded correctly?
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


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