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Thread: EE open loop idle

  1. #1
    Fuel Injected! steveo's Avatar
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    EE open loop idle

    so far there's no way known to force an open loop idle in EE, besides a shitty hack to the integrator that causes it to error and set a lean code after idling for a little while (which apparently clears itself once you get going again)

    seems corrupt o2 readings from overlap at low rpm tend to shove the o2 towards lean, making open loop idle something i find necessary

    i'll start picking away at it, any pointers? how is it done in other similar platforms?

  2. #2
    Fuel Injected! mmigacz's Avatar
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    If i'm understanding the question correctly, you don't want the IAC to make step corrections at idle, right? Somebody might have a better suggestion, but if you went to scalers and lowered the:

    IAC - TPS Percent for Closed Throttle

    to something unattainable (like 0%), it would stay in open loop idle (or never go into idle mode), right?
    1986 ski centurion boat, 351W, gt40P heads, edelbrock performer rpm, 1227747 ecm, 72 lb/hr injectors (@18 PSI fuel pressure), .490/.490 lift, intake 278 duration, exhuast 282 duration, 112 lobe separation

    1969 camaro, 355ci, performer RPM intake, camel hump heads, 1227747 ecm, 454 throttle body (@18 PSI fuel pressure),

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  3. #3
    Fuel Injected! steveo's Avatar
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    there's so much wrong with that, i'll just say... no,thats not what im talking about

  4. #4
    EFI GearHead ! EagleMark's Avatar
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    That's kind of the way it's done in other masks ... but differant code. Like $42 uses Open Loop RPM Threashold so there is a Idle on and Idle off RPM, has to go above Idle off to enter CL and below Idle on for OL. There are other settings for open loop idle as well like TPS% and MPH. But this mask was designed to have some cals run OL idle, like all BB engines.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
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  5. #5
    EFI GearHead ! EagleMark's Avatar
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    I did find and old trick in my notes that may work for Open Loop Idle, that is what is is titled?

    In "%TPS Threshold For WOT Vs. RPM (High Cool) " and drop the WOT setting below 1200 RPMs to 0

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  6. #6
    Fuel Injected! steveo's Avatar
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    woah i never considered that!

    that will go into PE mode at idle; so i could even use the PE tables to screw with idle mixture

    nice trick! i wonder if there are any other side effects. i can't think of many; all the tables that deal with PE mode could pretty much be zeroed out below 1200rpm or whatever.

    i'll test 'er out

  7. #7
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    is there no idle a/f ratio v's coolant temp table?im no good at finding stuff in a dissasembly but i did have a quick look LOL

  8. #8
    Fuel Injected! steveo's Avatar
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    no ee is supposed to be CL idle only, and in OL you just get ve or maf, but there is a closed throttle mult (that closed loop just trims out, of course..)

  9. #9
    EFI GearHead ! EagleMark's Avatar
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    Quote Originally Posted by steveo View Post
    woah i never considered that!

    that will go into PE mode at idle; so i could even use the PE tables to screw with idle mixture

    nice trick!
    Hadn't had any issues with it? When goes PE it goes OL, so I tried it and Poof, OL Idle, guess something else has to enable to go PE like an RPM setting? Was a long time ago and I wrote some notes on cheats with $EE because of all missing stuff and what guys had done over the years.

    Best one most cars have is the split BLM at idle and half a turn either way on throttle blade setting get's it closer, as you turn in and out you can see the split change side to side and get the mioddle! Then the infared heat gun temps on each header tube and adjust idle fuel per cylinder so they all match. Trick to that is start after a drive and then let idle and adjust. Poof no more split BLMs. But that won't be an issue with OL Idle... hope it still works as I have no other notes as to something else that needs done...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  10. #10
    Fuel Injected! steveo's Avatar
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    I know how to do per-cyl balance but damn bud lets see those notes! I'm planning on making an advanced EE tuning site sometime they might really help

  11. #11
    EFI GearHead ! EagleMark's Avatar
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    There's nothing left that I had not already added to the $EE you started with and then this OL Idle thing and it's been so long I hope my notes were right. I got no secrets...

    Every time I tune a different mask in person I try things and make notes if I can verify they are correct then add them to the XDF. If you want to see the most complete descriptions of most parameters look over my $42, most of it transfers to other masks.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  12. #12
    EFI GearHead ! EagleMark's Avatar
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    Remember to do the Low Cool parameter as well or it may be CL when cold.

    Since your working on the $EE XDF I thought I'd give you this one. It has a combined MAF table so in 2D view you can see all the MAF tables and make sure you have smooth transitions. I'm not sure if it had it in the one I was working on, which IIRC you started with. It had lots of descriptions already done as well. The last one I saw you worked on was sweet improvements!

    I was up to version 3.6 so I added that as well.
    Attached Files Attached Files

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  13. #13
    Fuel Injected! steveo's Avatar
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    my maf table def is all one table, I had the same idea, but; unfortunately tunerpro wont zoom in a 2d graph...? so its useless without a monster monitor..

    have suggested zoom on the tp forum

  14. #14
    Fuel Injected! steveo's Avatar
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    i have to report back and say that this PE trick was sketchy in my case. i dialed in correct target AFRs by using both the rpm and coolant table. the first few runs were great, right from cold start on a freezing cold day to hot idle, with no drivability problems and some good clean datalogs, and i got the target AFR i wanted. of course i also patched in the blm locker.

    it started misbehaving, though. on a cold morning, it would start perfectly, then immediately surge a few times and die.

    i waited a while, tried to start it again, and it was good to go.

    then it happened again.

    i've gone back to CL idle and nothing has happened since, so i don't think it's a mechanical issue.

    weird stuff, but i'd hold off if anyone wants to try it until i investigate more.

    i will look into 'why' when i get another spare PCM, i think im running on borrowed time on this one, since i'm thousands of flashes in.... i dont want my daily driver to fail a flash without a backup.

  15. #15
    EFI GearHead ! EagleMark's Avatar
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    Maybe a little more air over throttle blades to lesson IAC counts?

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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