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Thread: Newbie tuning saga of my LS Jeep TJ

  1. #46
    Fuel Injected!
    Join Date
    Jun 2020
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    39
    Thanks dave w. I was just looking at B3601 and seeing it is telling the computer to run at 14.68. Hitting 15 didn't seem horrible to me.

    I was curious if I tried setting that a little on the rich side what would happen? I was thinking telling it to try for 14 instead?

    If I watch the AFR closely on the stock OS I see the AFR dip to 13ish and rise slightly above 15 or sometimes 16 briefly while accelerating. Once I'm at cruise speed it settles in pretty close to 14.7 on average.

    I think I'm going to run this for a while and keep watching it. It doesn't feel as powerful as the other OS tune but it idles really good and seems smooth all around.

    I also hope to discover what else I must have missed when I changed the OS to 12212156.
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  2. #47
    Fuel Injected!
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    Jun 2020
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    I ended up driving the Jeep quite a few times this weekend. It seems to be running great and doesn't go lean with the current OS. I'm not sure if I'm going to change the OS back on this computer. I don't really have any need to tune this beyond where it is as far as I'm concerned. It seems to stay very close to stoich under all throttle conditions. And there is almost no exhaust smell. It idles very smooth as well.

    At this point though I am wondering why I need a vss because I can't tell how I would benefit from the GM computer knowing the vehicle speed.
    I am also not understanding why I need a manual transmission OS. This jeep seems to be fine with the original automatic OS with the torque management disabled.

    I will probably update this thread once I have figured out why it was running so lean with the other OS. Or maybe to ask questions about what I find. I am planning to follow through with it mainly as a learning exercise.

    Thank you all for the help with this.

  3. #48
    LT1 specialist steveo's Avatar
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    Aug 2013
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    there may be certain conditions where it will think you're standing still and not enter a certain mode. for example, it shouldn't be stoich under heavy throttle, it should be quite a bit richer as it enters power enrichment. is it going into power enrichment? is there a minimum vehicle speed to enter power enrichment in your application?

  4. #49
    Fuel Injected!
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    It does enter PE. If I stab the throttle it drops to ~12 and never gets above 13 at WOT. If I accelerate slowly it stays close to 14. I should probably make a video to show what it is doing.

    I have PE delay {B3608} at zero and PE Modifier by RPM {B3618} is at default values. I haven't found any vehicle speed reference for PE anywhere under Fuel>Mixture. It is entirely possible I missed it or it is elsewhere though. I do see speed reference under DFCO.

  5. #50
    Super Moderator dave w's Avatar
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    Quote Originally Posted by jeeper View Post
    At this point though I am wondering why I need a vss because I can't tell how I would benefit from the GM computer knowing the vehicle speed.
    I am also not understanding why I need a manual transmission OS. This jeep seems to be fine with the original automatic OS with the torque management disabled.
    It might not be necessary to use a VSS. When the tuning has challenges, adding a VSS is a good plan. There are several parameters that use VSS information, like DFCO.

    dave w

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