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Buell Forum » Big, Bad & Dirty (Buell XB12X Ulysses Adventure Board) » BB&D Archives » Archive through September 28, 2012 » Exhaust idea... what do you guys think? « Previous Next »

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Streetgliderx
Posted on Thursday, September 13, 2012 - 11:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

so i was thinking,... the stocker is growing on me, BUT i would like it to have the option of growling more at idle...

so here is what i propose and you guys help me iron out the details and i'll try it.

i wanna build an exhaust that will sound louder at idle than at speed... i had a boat with 454's and they had silencer type exhaust that were basically strait at idle but got quieter as you got the rpms up.

then maybe add a switch that would put it in quiet mode full time for town cruising or sneakin in late?

i need to know what the logic is on the exhaust valve, as in when does it open, what does the ecm need to see for it to open/close. or is this thing a simple it opens at X=rpm closes again at X=rpm?

basically a cut out for the bike but working opposite of the valve now?
what do you guys think of this idea?
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Buewulf
Posted on Friday, September 14, 2012 - 09:11 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I know it can be disabled, but I don't know if the knowledge is out there or not on what to change in order to set a new transition point for the valve opening. Hopefully, someone here knows.

Just a thought, but you could adjust the cable so that the valve is slightly cracked open when the motor is closed so it doesn't seat all the way. That may give you a little more burble at idle. Whether or not it affects performance in a noticeable way, I don't know. I bet not, but the only way to know is to try!
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Nobuell
Posted on Friday, September 14, 2012 - 09:13 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Just watch that the cable isn't to tight. You do not want the actuator stall due to the valve reaching the end of the stroke.
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Buewulf
Posted on Friday, September 14, 2012 - 09:22 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

You do not want the actuator stall due to the valve reaching the end of the stroke.

Excellent point, though if I remember correctly, there are still several degrees of rotation available to the valve once the motor reaches the end of its stroke. Definitely check it though.
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Streetgliderx
Posted on Friday, September 14, 2012 - 03:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Well I think I'm on a new direction,.... Another port in the pipe operated by an electric valve like a cut out? Put it on the tail of the pipe like a dual outlet? Then the factory valve will do its part and the aux valve will open it up
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Etennuly
Posted on Friday, September 14, 2012 - 05:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My Uly is an '06. I found a nice sound by adding a right tail pipe in the rear chamber. I cut a hole in the upper side of the rear chamber in front of the idler pulley, then welded a curved 1 1/2" diameter tail pipe on it. It is louder at idle and when riding slowly. At speed I do not even hear it.

I can get you a picture later.
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Treefrog
Posted on Friday, September 14, 2012 - 05:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Shoot Ourdee a pm. He had a cut out switch in the exhaust servo circuit. He may be able provide answers to some of your questions.
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Streetgliderx
Posted on Friday, September 14, 2012 - 05:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

thanks fellas!
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Buewulf
Posted on Friday, September 14, 2012 - 06:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Looks like someone may have had your idea...

http://www.buellxb.com/Buell-XB-Forum/Do-It-Yourse lf-Buell-Mods/I-installed-an-exhaust-cutout-on-my- XB12STT.
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Streetgliderx
Posted on Friday, September 14, 2012 - 07:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

yeah i seen that but i think i want the cut out at the rear of the bike... i think that will yield loudest sound at idle?
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Wesman
Posted on Saturday, September 15, 2012 - 11:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Back pressure is an important part of engine function. You may sacrifice smooth drive-ability if you do this. (think popping and stuttering). It may also devalue the bike at time of sale.
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Uly_man
Posted on Monday, September 17, 2012 - 01:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

"Back pressure is an important part of engine function." The valve/can system on this bike was fitted to improve low rev noise and the mid range revs.

I fitted a Remus can on my 06 bike and a have a Stealth can on the 2010 bike. I have had no "mid range" (or other) flat spots, smooth drive-abilty, pinging, stuttering, back fires, idle or other problems on either bike. On the 06 bike I even wired up the cable on the stock can and it was still fine.
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