| Author | Message | ||
     Red_chili |
I have a project in mind, to open up the stock muffler yet not end up too loud, and add a spark arrestor as well - to be fully USFS compliant. Anyone have the layout of the internals of the stock can? Photos? Might save me some exploratory surgery only to find I took a wrong turn with the plasma cutter... | ||
| Ulyssesguy |
Here ya go this might shed some light on the subject~ http://www.badweatherbikers.com/buell/messages/142 838/267863.html | ||
| Growl |
yep yep, that's what I want. For sure I'll stay tuned to your channel! | ||
| Teeps |
To be "USFS COMPLIANT" is easier said than done. http://www.fs.fed.us/eng/pubs/html/03511304/035113 04.htm | ||
| Red_chili |
Not at all. Weld-on SuperTrapp, carries the USFS approval. | ||
| Red_chili |
Great link. Similar to what a guy in GB did in '05. No cans on eBay right now, not sure I want the one-way ticket using my stocker, so I will wait and see. The advantage of a weld-on SuperTrapp is that the noise level will be much less - with resulting increases in backpressure - so I need to make sure the can core is pretty free breathing. Totally tunable. Should be relatively quiet with a good tone, and a spark arrestor to boot, and reasonably close to the stock EFI map. Them's the design goals anywho. (Message edited by Red_Chili on August 02, 2007) | ||
| Teeps |
Red_chili Posted on Thursday, August 02, Not at all. Weld-on SuperTrapp, carries the USFS approval. True, and it would add further character to the already character rich Ulysses.  | ||
| Teeps |
Red_chili, I modified a Uly can, and I would not do it again. If you just want/need a project that's great. Otherwise I would consider contacting Spec/ops or Drummer and inquire what they would charge to mod a can to your specs. | ||
| Red_chili |
Odie can barely do production of his normal pipes and Kevin is quite engaged with his regular pipes. And the Spec Ops pipe is just too loud for me, and SA-less. As are everyone's pipes including the stocker. For fun I have been known to remove perfectly good independent front suspensions from trucks and transplant solid axles, move drivelines, swap motors.... resulting in my having some nice toys (plasma cutter, OA welding rig, Miller 175, etc. etc.) which should make it a cakewalk. Of course, in theory, theory and reality are the same. In reality, they are not.  And I am a long way from an acoustics engineer... but what the hey. That's where the tunability comes in. (Message edited by Red_Chili on August 02, 2007) | ||
| Teeps |
You're old enough to know better Red_chili, so there's no saving you now. May the force be with you... | ||
| Bertotti |
Red_chili you never know but maybe even without the insulation the super trapps would limit the sound enough. Would it be illegal to run super trapps on straight pipes? | ||
| Red_chili |
That would be way too loud. Even the SuperTrapps I ran on an R100RS had glass packing ahead of the discs. It would be especially wrong in the forest! There's the rub. I like a bit more soul than stock, but not as loud as SpecOps or even Drummer, and not 'barky'. STs tend to not have as good a sound as, say, my wife's Bub pipes on her R100LS, but we shall see. And yeah, I'm old enough to know better. And old enough to hear the clock ticking! Better get on it!  | ||
| Red_chili |
Used pipe arrived in the mail...  SuperTrapp still not here...  (Message edited by Red_Chili on August 08, 2007) | ||
| Red_chili |
Done did it. I like! I took a look at a Drummer my son's XB9S has with an inspection scope and was surprised. The head pipe basically ends about where the stocker ends internally, then the entire interior of the pipe is open. Drummer lines their can with perforated steel and permanent packing, which contributes to the good tone no doubt. I was going to find some perf steel and do the same thing, but I had an afternoon and some motivation so I decided I could always add it if I didn't like the results. I cut the pipe in thirds, in front of the front 'Jackpoint' marking, and behind the rear 'Jackpoint' marking, capturing the bulkheads in the center section. I then used a plasma cutter to remove the bulkheads and three internal pipes. Interestingly the XB12 can I used had the head pipe terminate in the forward chamber, with the center section pipe just meeting it. I thought they were connected. Nice bonus. Clean. I then plasma cut a rear plate out of some sheet steel more or less the same gauge as the muffler and added a bit of exhaust adapter that fit the Trapp perfectly. Then I stitch welded the whole thing together. Turned out rather well. I left the muffler valve in, though it does very little any more. Results? With 13 discs, the note is less 'blatty' than the Special OPS pipe I had, and quieter, but is a nice tone. Very nice surprise; I have had SuperTrapp systems that just didn't sound all that great. It is not quite as 'deep' as a Drummer, but not quite as loud either. The Drummer is aptly named, it has a thud quality. This is deep, but less percussive. As far as power, I could immediately feel a stronger top end, like it wants to run past redline (this was after letting the ECM relearn the mixture). Not sure if the midrange is changed, but it seems quite strong. I might have to experiment with removing a couple discs - the nice side benefit of a SuperTrapp. And.... it is spark arrested. And dirt cheap. Rolloff leads to less afterfiring than the Spec OPS pipe did, which tells me the pipe has a bit more back pressure than Odie's pipe perhaps - cleaner run with the stock ECM in any event. No noticeable cruise surge either (unlike stock or the Spec OPS pipe, though admittedly this was in the 'barely noticeable' category). What's not to like? I'll have to see how it works with a race ECM when some funds free up. Maybe. |
