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AFR gauges

Discussion in 'EFI Maps and Tuners' started by Lugnut, Jan 31, 2015.

  1. Lugnut

    Lugnut Active Member

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    Have the opportunity to use an AFR reader that you attach to end of tailpipe. Belongs to a buddy in Texarkana & all I have to do is show up & buy'em a burger.
    My question is, are they accurate or put me in the "ballpark" on AFR?
  2. baggerpaul

    baggerpaul Well-Known Member

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    Sample should be taken close to tje exhaust port as possible .
  3. Lugnut

    Lugnut Active Member

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    I can go as far as the collector. I might have a curveball thrown @ me. I examined the baffle & I can't see shoving a sniffer past the baffle & into collector area. I spy a small opening @ end of convergence, but it's small & I don't know the dia of sniffer tube.
    Could be a problem.... IMG_1464.JPG
  4. hotroadking

    hotroadking Super Moderator Staff Member

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    yeah thats gonna be a problem
  5. JohnnyBiker

    JohnnyBiker Well-Known Member

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    Can one take the muffler off and take the sample from an open pipe?
  6. baggerpaul

    baggerpaul Well-Known Member

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    Nope it will throw the afr off it would show lean do to very high exhaust flow. What i did on my thunder header was take a long drill bit and right in the center of baffle made a very small 3/8 hole .and i ran the 3/8copper tube into the pipe . Worked for me and did not effect the sound or power.
  7. FLHTbiker

    FLHTbiker Moderator Staff Member

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    Looks like there might be a small hole already right in the center. Might need to be enlarged just a bit.
  8. hotroadking

    hotroadking Super Moderator Staff Member

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    Drill baby drill
  9. bambidee

    bambidee Active Member

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    Lugnut, Please take this in good humor. To be really scientific to the extreme you could check the front and rear cylinder each and drive yourself crazy chasing your tune-up. Ride it like you want to, check the plugs for peace of mind and listen for any death rattle. In other words ,enjoy the ride.
  10. JohnnyBiker

    JohnnyBiker Well-Known Member

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    Lugnut, it's your rude brother so do whatever you please with it and post it too so we can actually have conversations motorcycle related.;)

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