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Thread: NRHS Stage 2 for 07 XB12R

  1. #61
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    Quote Originally Posted by upaero View Post
    Why tune to 14.7 to accommodate a narrow band O2 sensor? It will run cooler and have better throttle response at about 14.2. Plus, those sensors are not the most trust worthy. I only keep the O2 sensor active to sense and report a lean condition with a CEL in the event something mechanically goes south. In CL the ECM will just compensate for a problem without you knowing about it (with the factory CL settings anyway). Add a baro sensor for air pressure compensation. Using a NB O2 sensor for sensing elevation is a terrible idea. You have intake air and engine temp sensors to adjust for temperature. What else would the ECM be able to (and need to) adjust for in CL?

    This is an interesting write up, even though it's about Harleys: https://www.drdyno.com/AIM_2010-07.html
    A lot of people disagree with you on this. Makes sense to me though.

  2. #62
    Senior Member outthere's Avatar
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    I've been running open loop for a few years using wideband O2 sensor and never an issue. AFV set to 103. Bike not street ridden though.
    Attached Images Attached Images
    Last edited by outthere; 03-26-2021 at 04:36 PM. Reason: we all like pics

  3. #63
    Senior Member 34nineteen's Avatar
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    lunatic_fringe is ___________ my spirit animal
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    I can see why more knowledgeable riders like upaero and outthere run their bikes that way. They appear to both be extremely knowledgeable and well versed in the operation of their bikes and able to troubleshoot and resolve problems if and when they arise.

    For the rest of us, myself included, running like that is like giving a machine gun to a monkey. I can figure out *most* but not all issues on my own, but even I know that I can easily get in the weeds when given too much control over the tuning. I know just enough to be dangerous, and would need a lot of patience and hand holding if I ran my bike in that configuration. Pre-canned tunes are best for me.

    YMMV. Just my $0.02.

    On another note....hey outthere, what exhaust is that? It looks like you married a Force to a SS Drummer? I like it!

  4. #64
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    Quote Originally Posted by outthere View Post
    I've been running open loop for a few years using wideband O2 sensor and never an issue. AFV set to 103. Bike not street ridden though.
    Mike check this out. Shaved 4.5 lbs off the drivetrain with this setup. You need it.


  5. #65
    Senior Member Cooter's Avatar
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  6. #66
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    Did you guys change your timing at all from stock? I have left mine stock but Hammer Performance suggested Harley stock maps may be too aggressive for the big bore kits due to the higher compression.

  7. #67
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    Quote Originally Posted by mike lowary View Post
    Mike check this out. Shaved 4.5 lbs off the drivetrain with this setup. You need it.

    What primary is that? And do the do multiple ratios?

  8. #68
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    Quote Originally Posted by lawdog View Post
    Did you guys change your timing at all from stock? I have left mine stock but Hammer Performance suggested Harley stock maps may be too aggressive for the big bore kits due to the higher compression.
    Yes the ignition timing maps were changed. The stock and race timing maps are ok up to a certain point. What’s your compression ratio now? Did you get the 30 degree reverse dome pistons?

  9. #69
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    Should have blown up the pic before asking. Thatís what I get for looking at stuff on my phone.

  10. #70
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    Quote Originally Posted by cvc View Post
    What primary is that? And do the do multiple ratios?
    Evolution industries billet clutch assembly and engine sprocket. As far as ratios go, they make engine sprockets with many different tooth counts. You can go up or down one tooth on the engine sprocket and still use the stock primary chain.



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