Tweecer/Tuner guys, help with A/F at idle

Discussion in '1994 - 1995 Specific Tech' started by zenboy99, Jan 20, 2006.


  1. zenboy99

    zenboy99 Founding Member

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    Well, it looks like you guys were right, it was the MAF transfer. I changed the MAF values and its down to 14.5-15.0 at idle.

    I looked back over my different MAF transfer functions and it seems the low values at idle didn't change very much over the course of the datalogs that I ran. I wonder why my car wasn't adapting to a lean idle? could it be that it was so lean that it was beyond the computer adapting? Everything is dead on driving around though.

    This is a great website, you guys always seem to help me see the whole picture of things and give an alternate view. And everytime something bad like this happens, I learn a little more about my car.
  2. Black95GTS

    Black95GTS Active Member

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    Yeah, I have to say, I was thinking about this and I realize its basically the same thing. I guess I looked at it my way, as an advantage, because I could see the LAMBSE straight away while you had to run it a bit to take the K values. But yes, we are going to arrive at the same result.

    Thanks for the compliment, that means a lot coming from a vet like yourself!:D

    I consider myself somewhat knowledgable.... but this spring time, I will be adding a 75mm TB, 80MM MAF, and 30lb injectors to handle a 125 dry shot. I will be bugging the heck out of you! So get ready! I want to have a 12 second car before I do heads and a cam. After I do H/C, I want to have a mid to low 11 second runner on 93 pump gas and a TwEECer tune!

    To Zenboy99: Congrats on figuring the problem out! The MAF transfer is an amazingly powerful function. I haven't had the (dis)pleasure of having to figure it out since my mods aren't beefy enough to warrant it. But pretty soon I'll be posting similar threads to yours! Good luck and good driving!

    Adam
  3. final5-0

    final5-0 Mustang Master

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    Things are gonna change BIG TIME with those upgrades :rlaugh:

    Your gonna have a good time :nice:

    and

    Most Definitely learn a new trick or two :D

    Grady
  4. final5-0

    final5-0 Mustang Master

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    Hey Mr. Chad

    How much did you have to change the maf points?

    Grady
  5. VibrantRedGT

    VibrantRedGT "STANGNET'S PENGUIN SMACKER" Super Mod

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    Even though I'm a PMS user this thread is a great read. Glad it all worked out.
  6. zenboy99

    zenboy99 Founding Member

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    Stock values from my flowsheet were:
    0.7998---26.40
    1.0000---35.204

    Over a dozen datalogs and the 0.79 value never changed in EEC analzyer even though I was idling at ~0.85 volts.

    New values:
    0.7998---32.0
    1.0000---37.5
  7. zenboy99

    zenboy99 Founding Member

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    Just posting this up for more info.

    I've been playing with the lower MAF transfer function all week. Now that I have the idle running about normal, the KAM's are changing at idle. So maybe my problem before was that the car was so lean that the KAM values weren't changing at all? The computer couldn't/wouldn't adapt to the lean idle? I have another local friend who said he experienced the same thing.
  8. final5-0

    final5-0 Mustang Master

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    No maybe to it at all Chad

    If you are too far out of range, as far as fat or lean, the adaptive does not behave as it should.

    Now you are getting in the range, here are a few things to consider that can effect closed loop operation. :)

    slopes
    breakpoint
    offsets
    maf point
    tb air flow
    neutral idle air flow

    there are others to be sure
    but
    those are the biggies that come to mind right off the bat :D

    :banana: good to see you making progress :banana:

    Grady
  9. zenboy99

    zenboy99 Founding Member

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    I'm a Tweecer junkie. My wife told me that in the last week I've spent more time in the garage with my car than with her. I told her its better than me dishing out attention to a hooker, sometimes your car needs some lovin' too.

    Speaking of car lovin', I just got my first ever allignment 179,000 miles then a new coil-over strut install screwed things up pretty good. Wow is the car nice to steer now.
  10. final5-0

    final5-0 Mustang Master

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    :lol: :lol: :lol:

    No doubt about ........... you're hooked now :rlaugh:

    You suddenly realize ...... Look at all this data I've gathered

    Then you start to ask yourself Q's that always begin with these words

    I wonder if ...........

    Yep .......... You've crossed the point of No Return :eek:

    No Turning Back Now for You Chad :D

    Grady
  11. blksn955.o

    blksn955.o Founding Member

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    ya dude your ***t.:D

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