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Thread: Reversion Elimination Tuning

  1. #1
    Join Date
    Nov 2017
    Location
    United States
    Posts
    2

    Default Reversion Elimination Tuning

    I searched but was unable to find anything specific, so I'll ask here.

    Build details:

    2000 Buell M2
    1250cc
    Andrews N4 Cams
    Ported and polished Thunderstorm Heads
    Polished intake
    Mikuni HSR42
    Buell Race Ham can

    At RPMs above 5000, I'm getting reversion pulses back through the intake. The result is gas soaking the K&N filter and black soot in the intake/airbox. I can also hear the pulses at that RPM range.

    I currently have the SuperTrapp IDS Slip-on muffler with stock exhaust with 15 disks installed.

    Looking for guidance on tuning to reduce/eliminate the reversion pulse waves.

    Should I add disks or add disks?

    Thanks.

    20171001_130110-1612x784.jpg

  2. #2
    Join Date
    Jul 2007
    Posts
    407

    Default

    15 discs with closed cap, this might not be enough flow. You may be choking the flow causing the issues?

    You can verify this easily, remove the discs complete and try it. With no restriction from the discs, you should eliminate the issue. If it sill happens, you have some other issues!



    Quote Originally Posted by FTBSTRD View Post
    I searched but was unable to find anything specific, so I'll ask here.

    Build details:

    2000 Buell M2
    1250cc
    Andrews N4 Cams
    Ported and polished Thunderstorm Heads
    Polished intake
    Mikuni HSR42
    Buell Race Ham can

    At RPMs above 5000, I'm getting reversion pulses back through the intake. The result is gas soaking the K&N filter and black soot in the intake/airbox. I can also hear the pulses at that RPM range.

    I currently have the SuperTrapp IDS Slip-on muffler with stock exhaust with 15 disks installed.

    Looking for guidance on tuning to reduce/eliminate the reversion pulse waves.

    Should I add disks or add disks?

    Thanks.

    20171001_130110-1612x784.jpg

  3. #3
    Join Date
    Nov 2017
    Location
    United States
    Posts
    2

    Default

    Remove all disks and the inside end cap?

  4. #4
    Join Date
    Jul 2007
    Posts
    407

    Default

    Quote Originally Posted by FTBSTRD View Post
    Remove all disks and the inside end cap?
    Yes, eliminate any restriction in the muffler by trying it with no discs and no internal end cap.

    If it still has the issue, then you have other problems.

    If the issue gets better or is resolved then you need more discs (and make sure they are not overtightened).

    Simple elimination.

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