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Thread: wideband logging

  1. #16
    RIP EagleMark's Avatar
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    Quote Originally Posted by steveo View Post
    i think that's a good sign. or maybe i need new tires.
    To much HP is a good sign and even tires won't help on wet roads...

    I don't know why the LT1 $EE is so much harder to do with NB, but it is way easier with others ECM/PCM/Masks. With aftermarket cams the idle and low RPM are usually more human work then data in all to get it right, following the slope of accurate mid range data into your 3d graph.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
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  3. #18
    LT1 specialist steveo's Avatar
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    thing is, even with my o2 median voltages set at 500mv, once the trims stabilize, it's still ~15.0:1 long average on the wideband in most operating ranges.

    this sucks because when i was running pure open loop at 13.5:1 to get a good reference point for scaling tables, it was running so smoothly, and now you can feel it's just not quite in the right territory...

    i think i might just make sure PE is always active when the thing isn't cruising, and tune PE to get my targets.

    or should i try cranking the o2 voltages up a bit more? i bet it'll get pretty unstable if i push it too far. i at least want to get it closer to 14.7 under light accel..

    or, maybe there are more parameters hidden somewhere that could be leveraged to force it into open loop during some ranges?

  4. #19
    RIP EagleMark's Avatar
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    Did you ever find the Stoich AFR parameter? This could be the issue running E10 fuel? They are all set to 14.68 to 1 AFR. The first thing I do in a tune is set to 14.1 for E fuel and usually fuel trims go away.

    The Stoich AFR Parameter is the first thing the fueling calculation looks at!

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  5. #20
    LT1 specialist steveo's Avatar
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    i dont think EE even has that parameter? you could be right...

    where i live, we're E5, not E10, but that's 14.4 or so, and that's still just over 1% i think (just math in my head right now)

  6. #21
    LT1 specialist steveo's Avatar
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    you know, thinking about it, i guess i actually dont mind it running a bit lean in closed loop. kind of a lean cruise feature. i just need to get it the hell out of closed loop when im not cruising, and that's doable. i already have idle, i'll just turn down TPS% to get into PE, and dial the enrichment into a range that i like.

  7. #22
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    Quote Originally Posted by steveo View Post
    i dont think EE even has that parameter? you could be right.
    It would be the only GM ECM/PCM without it?

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  8. #23
    LT1 specialist steveo's Avatar
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    damn i wish i was better with disassembly. i'll look for it, though. i've found some misc. parameters before but this might be a bit out of my realm.

    either that or im going to owe robert a whole ton of beer...

  9. #24
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    Quote Originally Posted by steveo View Post
    damn i wish i was better with disassembly. i'll look for it, though. i've found some misc. parameters before but this might be a bit out of my realm.

    either that or im going to owe robert a whole ton of beer...
    You and every other LT1 owner already owe him a ton of beer! Don't know if you did so but a message of thanks to him in your XDF or writeup would be in order.He's very modest and overlooked at all the work he has done for the DIY Tuning community! I'd bet he already found it on the V6... if you had that address or algorythm it would be a good place to start looking with TP 2d tools and use his Parameter. Then test... does LT1 show commanded AFR in data? Like when entering PE...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  10. #25
    LT1 specialist steveo's Avatar
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    no, i'm almost certain it does not have any datastream value for commanded AFR, i've been all over every byte of that damn datastream in my datalogger project.

    as far as credits go, i do have an edited note of thanks as follows in my current xdf header (not uploaded yet, still finishing a few other changes up):

    Special thanks to:
    robertisaar for his amazing disassembly work finding the new o2 parameters, the gearhead-efi.com crew for their major contributions to this project, and to Mark from Tunerpro for his foundational work in the EE platform.


    it's very hard to pay back peoples help into useful compensation other than the odd thank-you.

    i know this very well, i also contribute many hundreds of hours online helping people with their car problems without recieving even a thank you most of the time. but, you know, if you dont enjoy doing it, then dont do it.

    as far as my fbodytech site goes, nah, no credits. there are too many sources. i dont even give myself credit :P
    Last edited by steveo; 02-18-2014 at 06:48 AM.

  11. #26
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    Again, if found in dissasembly it can be swapped in place os something else. But not really needed as you could find the Stoich by testing with WB.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  12. #27
    LT1 specialist steveo's Avatar
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    you know what, i think i've tuned my way around having that value available to a certain point, if i had it available, im not sure i'd even change it... but wow would it be awesome to have in my xdf.

    i think when im done wideband tuning my PE mode stuff (when the roads dry out) i'll dig a bit more into it and see if i can get it. i need the practice.

  13. #28
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    follow the BPW calc far enough back and it will most certainly be involved..... may be faster to find working forward though, since the airflow calculations are pretty well understood. once airflow is calculated, the ratio of fuel to mix with the air shouldn't be too far after.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  14. #29
    LT1 specialist steveo's Avatar
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    makes sense, i'll try!

    i'd expect a fairly obvious branch somewhere, where it either does a lookup on the open loop fueling table, or based on (this variable), then scales it with all the closed loop stuff, right? i assume it'd check the closed loop enable bit itself as its sole condition

    i think i can chase it based on those assumptions.

  15. #30
    LT1 specialist steveo's Avatar
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    also the assumption that 0.10X+0 on one byte seems to be the conversion for most other cals when AFR is specified, including the open loop target table in EE, so it's more than likely i'd be looking for 0x93, right?

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