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Thread: Seeking XB9 ECM Suggestions

  1. #11
    Senior Member 34nineteen's Avatar
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    Quote Originally Posted by Cooter View Post
    I'm a carb guy from way back as well IMO the Buell DDFI2-3 fuel injection system is rock solid and still works well, but remember it was designed 20 years ago! It gets a bad rap because of poor motorcycle maintenance, *unqualified modifications, and just being old tech in the time of i-phones now.

    Since the ECM was jailbroken and 10,000 rookies got to mess with "tunes" it's been a ****show. Even worse "My bike sat for 5 years and now it runs like crap when I jumped it and went WOT down the street, I need to tune the injection to fix it!". NO dammit... FIX it, THEN tune it. (Sigh)

    I can't begin to explain EPA regs for clean running in this post. Simply that it's not "running lean". That would make terrible emissions as well (HC). 95% of the time your bike is running in Closed Loop "part throttle cruise" where the ECM adjusts to keep the mixture perfectly stoic many times a second. Not lean, not rich, and the pipe won't matter because its not at max power. The ECM is adjusting constantly, many times a second, and well within the ECM's adjustment parameters.

    In order for an engine to run "clean" it's not about using less gas (remember, lean=bad emissions). It's about:

    1) Adding/subtracting gas slowly, so that most of it is burned in the engine and not sent out the tail pipe (bad emissions).
    2) Using the minimum about of gas for acceleration (and WOT), so that most of it is burned in the engine and not sent out the tail pipe (bad emissions). Less gas than max power is what "they" mean by 'running lean, EPA BS...' but it isn't technically "lean".

    Of course neither of these things is good for rapid engine speed changes or maximum power, so the solution is to change the Open loop fuel map for more gas on acceleration and more gas at WFO. In carb speak, it would be a bigger accelerator pump and bigger power valve. The main jets (Closed loop/cruising) stay the same, and cruising is unaffected. You are looking for an accelerator pump and power valve Map, lol.

    *Oversimplification warning!* and I should mention that some believe tuning the Closed Loop targets richer (bigger main jets) help it running. I've pulled out too many black sooty plugs to believe that, and why would you need to add too much gas when you're just cruising?

    Hope that helps!
    CoOter,

    You have been warned about this before. Riders must purchase a special tool to determine this. Its $410.00USD+ship+sales tax.

    I will grant you a pass this one time with a firm warning. No funny business or other subterfuge will be tolerated.

    34nineteen
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    34nineteen@verizon.net
    Last edited by 34nineteen; 05-06-2021 at 10:46 PM.

  2. #12
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    @cooter
    thanks for the wisdom, very helpful

    iím going to get the bike now and hopefully an android within the next few days. will let ya know how it looks once i have the droid. but until then iíll be gone riding))

  3. #13
    Senior Member Cooter's Avatar
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    Quote Originally Posted by 34nineteen View Post
    ...subterfuge...
    Says the guy that invented stalking!

    rkdw: Have fun, these are super awesome machines and I'll always have a spot in my garage for one Please post some nice pics in the Pic thread, we love pics here and 34:19 probably owned it at one time in the past.
    If you don't mind a suggestion:
    As a new-bike-to-you don't let the excitement of a new toy make you forget the basics. Wash it, really well! That will get you familiar with it and up close enough to notice little things, like pitted fork shafts or leaks. Pushing it around can show you bad wheel or stem bearings, brake issues, belt issues.
    Check air pressure, tire date codes, battery date code, flush the brake fluids (because NO ONE does that!), check the brake pads, brake light, signals, air filter (or buy a KN from me), adjust the suspension to factory starting point for your weight (then look up Dave Moss on You Tube to dial it in). LOTS of stuff to do before getting in the electronics of a "well running" bike.

  4. #14
    Senior Member 34nineteen's Avatar
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    Quote Originally Posted by Cooter View Post
    Says the guy that invented stalking.
    Donít hate the playa, hate the game!

  5. #15
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    Thanks guys. Finally, today is my garage day. Heading out to clean her up and do all pre-checks Will post some pics once it's shining))

  6. #16
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    So Ive put about 200 miles on the bike already and wow..best thing that money can buy.

    Today I finally got an Android so I could check on that AFV like Cooter mentioned. It read 86.9 after riding about 50 miles today in 65F @ 1300FT. That seems especially low since the bike has Exhaust/K&N/breather mod, doesnt it? I was kind of expecting to see something like 110. The bike runs fine. I have nothing to compare it to really, but there are no problems, never stalls or hard starts..it does backfire a good bit on closed throttle engine braking, but that seems to be pretty common from reading here. I did nothing other than connect and read through the values. No changes or resets.

    Any suggestions on things to check for that may cause a low AFV? Possibly other values in ecmdroid that could indicate something?

    PS. Bike was previously titled in MN, @34ninteen was that you?
    Last edited by rkdw; 05-17-2021 at 04:28 AM.

  7. #17
    Senior Member Barrett's Avatar
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    That seems especially low since the bike has Exhaust/K&N/breather mod, doesnt it?

    yes
    thread commenced with "i believe.....stock mapping". you'll never know till you confirm. you have no base-line to work with.

    it does backfire a good bit on closed throttle engine braking, but that seems to be pretty common from reading here.
    not as common as the internet has lead you to believe. address that. it's annoying and unnecessary.
    pull fuel from "decel".....closely and competently check entire exhaust system for loose fittings...cracks...broken clamps...broken front hanger mount...crack at O2 sensor bung. air leak anywhere in this system exacerbates after-firing.

    O2 sensor performing its swan-song

  8. #18
    Senior Member 34nineteen's Avatar
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    Quote Originally Posted by rkdw View Post
    34ninteen was that you?
    I think all of my ex-bikes currently live in AZ or CA. I see them pop up for sale from time to time.

  9. #19
    Senior Member Cooter's Avatar
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    ...for more money...

  10. #20
    Senior Member 34nineteen's Avatar
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    Yeah, a lot of them have been put back up for sale for more money than I sold them for.

    When I sold my first 1125CR, the guy told me some sob story about how he always wanted one and all he had was $xxxx. I bought his story and sold him the bike at his lowball price. Not even a week later he had it back up for sale for $500 more than I had it originally listed at. So, yeah...lesson learned.



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