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Thread: XB12SCG '08 /w performance exhaust & filter -> running RICH! Help!

  1. #1
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    XB12SCG '08 /w performance exhaust & filter -> running RICH! Help!

    I have had the bike about 2 yrs now.
    It has Sebring exhaust (same as Remus?) and BMC airfilter (open airbox + breather re-route mods done).
    To my knowledge the ECM has never been previously touched -> should be stock.
    I feel that the bike runs fairly well with this setup.
    But I have been worried that I am doing harm to the engine by running it with "stock" tune but having performance parts.
    To my understanding this kind of setup would lead to LEAN running condition, since air is more "easily available".

    So, I got the Buelltooth+ECMDroid and first thing I had a look at the AFV -> It was 84%.
    This was already quite strange to me since I would have expected the system to try to ENRICHEN the mixture.
    So the first question is: How can it be that the system (with the performance exhaust and filter) is running so RICH that
    the ECM has to take 15% of the fuel?! This just doesnt't seem logical to me...
    I also recorded a log and analyzed in Megalogviewer -> o2 seems to be fluctuating rapidly around the 0,5V point,
    so it should be working correctly (assuming that the sensor is OK).

    Ok, then I tried to run the bike with the tune-file (.xpr) I got from from Buelltooth for this setup.
    The recommedation was to run it in open loop an so I did.
    --> it ran like crap, sluggish acceleration and gas smelling. So I think it was running very RICH.

    Then I went back to the stock tune and tried to run it in open loop as well, resetting AFV to 100%.
    --> not running well, and gas smelling again...
    Also I did a log with this setup and the o2 sensor confirmed that it was RICH, signal around 0,7V.

    In my opinion, all these findings suggest that the bike is indeed running very RICH.

    Does anyone here have an idea what could be the casue of this?
    And how to fix it?
    I am out of ideas...

    Thanks!

    XB12scg 2008
    BUEOD
    Buelltooth+ECMDroid
    MegalogviewerHD

  2. #2
    Senior Member Silverrider's Avatar
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    What do your plugs tell you ?

  3. #3
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    simply upgrade to HellFire "One-Percenter" complete exhaust system with wrap. it will cure all your ailments. 0:30 mark i start gettin' down to business for ya!

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    Last edited by user_deleted; 08-04-2018 at 01:45 AM.

  4. #4
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    Hell fire 1%er for life !!!! 👍🇺🇸

  5. #5
    Senior Member Cooter's Avatar
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    Haha, Lunatic

    Hey Jesserontu: I would highly recommend fixing the bike before you continue to mess with the ECM.
    The AFV the low is not a sign of a bad tune in a stock ECM, it's a sign you have a problem that needs to be fixed.
    If you are able to get it to run well by doing that (unlikely) you will just be masking the problem that caused it in the first place.

    Your next question will be "What could cause that", and the answer is a LOT of things. Hard to diagnose an unseen bike one thing at a time invariable jumping from one guess to another...

    You can find the service manual for free at the same website you bought the Buelltooth, or at Buellmods.com. Follow the diagnosis flow chart for how it runs at 100 AFV.
    Last edited by Cooter; 08-04-2018 at 02:18 AM.

  6. #6
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    I rec the before mentioned Hell fire 1%er exhaust mated with a MAGA tuner. Great job Lunatic. 👍🇺🇸.

  7. #7
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    HellFire "One-Percenter" complete exhaust system with wrap
    Haha that's insane!
    I see how that is able to cure all the problems in the world...

    What do your plugs tell you ?
    Haven't seen them yet, unfortunately.
    I know it would give valuable information on this but I have also understood they are very difficult to get to...
    Is that true by the way? Haven't had time to look into that yet...
    I think I must do that next..

    The AFV the low is not a sign of a bad tune in a stock ECM, it's a sign you have a problem that needs to be fixed.
    If you are able to get it to run well by doing that (unlikely) you will just be masking the problem that caused it in the first place.
    Yes I agree, thanks for the verification.
    And I also understand I might have a complex task ahead of me
    But yes, my plan is to get to the bottom of it like you proposed.
    I know there are many possible influencing factors in the ECM+sensors, but how probable do you guys consider a problem with the fuel pressure or injectors? To me those would be the simplest (mechanical) reason for too RICH mixture (too much fuel getting through with certain injector pulse width).
    How frequent are these kinds of problems in these components?

  8. #8
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    I am *not a knowledgeable tuner, but have you talked with Dave at Buelltooth about your issue? There is a fairly common issue with certain 'race' configuration tunes where the closed loop area of the fuel table is richer than it should be. This causes the bike to pull fuel and results in the wholesale reduction of fuel cell values, often into the lower 80s, read as a percentage, across the entire fuel table.

    It might be wise to talk with him since supplied your usb interface and tune. He has talked at length with me about this very phenomenon, so your question won't be coming out of left field for him.

    As Cooter said, if you have an issue with the bike, you need to fix that before worrying about tuning; however, if you turn out to be like me - with a mechanically sound bike that still insisted on dropping the AFV to the mid 80s no matter what, you might be in the situation where you are literally fighting with your tune as a result of a region within your closed loop fuel values. Drop Dave a line. He really helped me out in this area, and my bike is running wonderfully as a result.

  9. #9
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    There is a fairly common issue with certain 'race' configuration tunes where the closed loop area of the fuel table is richer than it should be. This causes the bike to pull fuel and results in the wholesale reduction of fuel cell values, often into the lower 80s, read as a percentage, across the entire fuel table.
    Yes, I have heard about this problem.

    Actually I forgot to mention that, when I ran the bike with the "matched" tune from Buelltooth, I ran it open loop AND fixed the AFV to 100%. Thereby the system is not able to do the "reduction of fuell cell values across the map".
    But like mentioned, it ran like crap...

    So I think this further verifies that there is something wrong in the basic working of the bike, mechanical or in the DDFI system.

    Do you guys have any idea what are the most common causes in Buells to have RICH mixture?

  10. #10
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    And yes, I will try to contact Dave...



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