exhaust system

Discussion in 'Airheads' started by darmahman, Mar 4, 2013.

  1. Les_Garten

    Les_Garten Been here awhile

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    #41
  2. Uncle Pollo

    Uncle Pollo Long timer

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    170 mj of mikuni will not work
    #42
  3. Les_Garten

    Les_Garten Been here awhile

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    @BoxerBoy81

    Do you do requests?

    How about one fully warmed up?

    I really am liking the sound of those pipes compared to the alternatives.
    #43
  4. boxerboy81

    boxerboy81 Stay Horizontal

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    :lol3 Requests!

    If I get time today, I'll take it out for a spin.
    #44
  5. boxerboy81

    boxerboy81 Stay Horizontal

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    Something slightly bigger than what is in the Mikuni should do it. The BING went from 160->170 mj.
    #45
  6. Les_Garten

    Les_Garten Been here awhile

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    Thanx!
    #46
  7. boxerboy81

    boxerboy81 Stay Horizontal

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    Well, I took it out but the vid was rubbish...different camera, poor res..
    I won't get a chance for a few days now.


    I did have lots of exhaust popping on overrun, which was something I had last time too, but it seems more now. The only difference is the 2.68 needle jets and new needles, verses the old 2.66 and well used & worn needles. Second spot for the needles.

    The system is as tight as I can get it.
    #47
  8. Les_Garten

    Les_Garten Been here awhile

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    Thanx, I'd just like to hear it idle and rev while warm.


    RE, the burbles
    My experience with EFI is that burbling and what not are from being rich on over run.

    Carbs not so simple maybe. There may be some back feeding of air from the tailpipe end when the throttle is closed due to reversion from the opening.

    When you slam the butterfly shut, you cut the air, so the natural initial reaction would be rich.

    On an EFI system, you make a setting in the computer to turn the injectors off when the throttle body closes.

    My Porsche 930 burbles and coughs flames about 3 feet long on over run. Then I just click and say shut off injectors on over run and it's dead quiet, /Flame off

    Are your plugs a little dark or black? How do they look?
    #48
  9. boxerboy81

    boxerboy81 Stay Horizontal

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    I haven't looked at the plugs recently, but they were carbon coated on the outer collar. The firing electrode area seemed ok, not white, more a light grey.

    With the JC pipes back on, initially I had the new 2.68 NJ's and new needles at the second notch. I had removed the old 2.66's and needles.

    The overrun noise was too much however, so I replaced the 2.68's with new 2.66's and slightly tweaked the mixture screw a little leaner. That helped quite a bit.

    So now the setup with the JC's is K&N air filter, 2.66 NJ's and new needles @ the 2nd notch.

    Now I just need to get the cables synched just a tad better and I'll be happy.
    #49
  10. darmahman

    darmahman "Illogically Deluded"

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    FWIW- I put ~ 75 miles on my bone stock 82 R100 after I installed the JC's.
    I am at 5000" and it runs perfect. Some pop on overrun but nothing I don't like.:evil The more miles I put on it the quieter it gets...
    Definate SOTP power improvement. I feel like a 62 year old hoodlem when I ride it...


    #50
  11. darmahman

    darmahman "Illogically Deluded"

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    #51