| Author | Message | ||
     Streetgliderx |
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? | ||
| Buewulf |
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! | ||
| Nobuell |
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. | ||
| Buewulf |
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. | ||
| Streetgliderx |
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 | ||
| Etennuly |
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. | ||
| Treefrog |
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. | ||
| Streetgliderx |
thanks fellas! | ||
| Buewulf |
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. | ||
| Streetgliderx |
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? | ||
| Wesman |
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. | ||
| Uly_man |
"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. |
