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Thread: Supertrapp with open or closed end caps

  1. #11
    bschultz Guest

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    Quote Originally Posted by p-p View Post
    No no, I don't have the same amount of discs. I had 21 discs in each muffler with closed end caps and i have now 12 discs with open end caps. I took 9 discs away...
    On the internal disc system, with 3" discs, the open end cap is equal to the flow of 6-7 discs (9-10 on the 4" systems). You may want to try adding a couple of discs (w/open end-cap) and see if the seat of the pants feeling comes back.

  2. #12
    bschultz Guest

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    Quote Originally Posted by CAPTNAVYRET View Post
    The bike was tuned by an "certified" PC service center. The bike was tuned with no end plate in place. If I leave all 12 plates in place and add the endplate, should I have a very poor running machine...very rich?
    Adding the "closed" end-cap will restrict the exhaust flow and should cause the machine to run richer and will most likely affect performance.

  3. #13
    CAPTNAVYRET Guest

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    Quote Originally Posted by bschultz View Post
    Adding the "closed" end-cap will restrict the exhaust flow and should cause the machine to run richer and will most likely affect performance.
    As a "rule of thumb," if I need to put the endplate on to i.e. pass state inspection, how many discs should I remove to be equivalent to the open end with 12 discs?

  4. #14
    p-p Guest

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    Quote Originally Posted by bschultz View Post
    On the internal disc system, with 3" discs, the open end cap is equal to the flow of 6-7 discs (9-10 on the 4" systems). You may want to try adding a couple of discs (w/open end-cap) and see if the seat of the pants feeling comes back.
    Tanks, I will try with 14 or 15 discs and open end cap !

  5. #15
    CAPTNAVYRET Guest

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    Quote Originally Posted by bschultz View Post
    Yes it's possible, if you are running the same amount of discs.
    The open end-cap is equivelent to more discs.
    Generally speaking;
    More discs, more flow, more sound, more top-end...leaner running
    Less discs, less flow, less sound, more low-end...richer running
    What is the equivalent in discs when one uses the endcap? If it is equivalent to 10-12 discs on the 5" system (V5), it would seem to me that if an open system with 12 discs was a tad rich that a closed system (endcap on) with 8-10 discs should work a little better (slightly leaner). Now Sir Guru, am I all wet or ???

  6. #16
    p-p Guest

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    Quote Originally Posted by p-p View Post
    Tanks, I will try with 14 or 15 discs and open end cap !
    I tried with 15 discs and open end caps. It works great !!! I don't know if it is possible to do better, but I won't try !!!

    Thanks a lot Bschulz for your help !!

  7. #17
    bschultz Guest

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    Quote Originally Posted by CAPTNAVYRET View Post
    What is the equivalent in discs when one uses the endcap? If it is equivalent to 10-12 discs on the 5" system (V5), it would seem to me that if an open system with 12 discs was a tad rich that a closed system (endcap on) with 8-10 discs should work a little better (slightly leaner). Now Sir Guru, am I all wet or ???
    More discs, more flow, more sound...leaner running
    Less discs, less flow, less sound...richer running

  8. #18
    DavidHD Guest

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    Hello!:

    p.p. your tests is great help for me. But I have one cuestion for Guru. Appears p.p find the best performance with 15 discs and end cap open. Its the same for TC96 on Street Bob? I want in my bike the best torque. I understand the recommended conbination is 12 discs and end cap openned?

    Thank you very much.
    Last edited by DavidHD; 09-24-2007 at 09:16 AM.

  9. #19
    p-p Guest

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    Quote Originally Posted by bschultz View Post
    More discs, more flow, more sound...leaner running
    Less discs, less flow, less sound...richer running
    If I understand well :

    - more I add discs, bigger should be the main jet ?

    - less I have discs, smaller should be the main jet ?

    A friend of mine tells that it is the opposite. He tells that if you open the pipes, you have to put a smaller jet...

  10. #20
    bschultz Guest

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    Most likely.

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