| Author | Message | ||
     Ratbuell |
My bike (new to me) has the 'trapp exhaust on it, with 12 discs and endplate installed. It sounds OK, but is more raspy than I prefer. I like a deep, low frequency rumble like the SS2R on my S1W, or the old race can I had on my 99 M2 years ago. May not be possible with a disc muffler...but more (?) discs may get me closer? I haven't had the carb open yet to see if there's a jet kit in there, but the bike runs great. Hopefully this weekend I'll get a chance to baseline it with a/f, just to make sure it's in spec. I'm also wondering if there is a recommended "max ambient temperature" for running the lower fairings. I know on my FLHP, they recommend not using the "splash guards" that I can snap into the crash bar over 45 degrees. Will I run into a heat problem with the S2, or do they not impede engine cooling? If I can get the guys to retrofit the frame with some tabs to take Dzus fasteners instead of nuts-n-bolts, I may take 'em off when it's warm out. I like the protection though, in case it rains.... | ||
| Iamike |
If you install an open endcap at the end of the discs it will give you a nice low rumble. Of course, that is for 'race use only' | ||
| Rick_a |
I'm using 18 discs and a custom endcap. I made this up to keep heat off the rear tire while allowing me to get max power/torque without using an excessive amount of discs. It isn't pretty but it works as intended, and happens to make an incredible sound.  | ||
| Ratbuell |
"Open endcap"...as in, not installing the endcap, but just the discs maybe?  | ||
| Rick_a |
I've tried that, too. That is an incredible sound, but kills the bottom half of the useable RPM range. Talk about a torque dip! You can actually hear it come on the pipe past about 4000-4500 RPM. Never tried it on the dyno. Didn't need to. This is what Mike is talking about:  Cheap and effective. | ||
| Not_purple_s2 |
My dad, God bless him he was a Harley guy, took the discs off my supertrapp when I left the S2 with him. (He "took care of it"  when I was in college) It sounded like a harley but yeah it ruined the torque. I switched to a Vance and Hines eBay special and have been very pleased with both the performance and sound. It's almost too quiet at idle but it has a nice deep sound when you rev it. Plus I really like the looks of the V&H better. (Message edited by Not_Purple_S2 on April 25, 2007) | ||
| Djkaplan |
Damn, Rick... that's the most discs I've ever seen on a Supertrapp - I bet it sounds good. Nevrenuf's got a Supertrapp with an open endcap on his M2. I thought it was the best sounding bike at MBIV. | ||
| Sleez |
i ran 21 discs and took that "stock" race only end cap and opened up the hole about another .250 dia. sounded kick ass, and felt great, was not quite as loud as the KT, but close! | ||
| Iamike |
I didn't mention that mine was an IDS, so you have to take the outlet pipe off to get to the discs. You could probably run it without the closed endcap but with little obstruction and lack of backpressure, that is probably what kills the low end. I didn't dyno mine with the changes but went by what others got from their dyno runs. I think that ideal was 8-12 discs. I put my endcap back on because I leave for work at 6:30AM and didn't want to disturb the neighbors too much. | ||
| Eshardball |
I think if you pull the baffle out you may find that the glass matting is burned away. Replacing the matting will lower the tone. I had pulled the baffle (loud is Good) but put a drag pipe baffle in the end of the header to keep from losing the low end pull. I have a Force pipe now which is about the same volume but sounds a bit better. | ||
| Ratbuell |
On my M2 I had the Buell race muffler...otherwise known as a Supertrapp IDS muffler. I ran it with nothing on but the external end cap / spout, jetted it appropriately (don't ask me at this point, it was years ago), and it ran better than it did with the SS2R on it. I'll monkey with the S2 and see what I can get out of it. | ||
| Rick_a |
It actually looks like more than it is. I cut off the "excess material" that shrouds several of the discs. Many iterations were tried on the dyno, and this gave me the best peak TQ and HP numbers without having to sacrifice any bottom end responsiveness. The innards came out of this one after around 10,000 miles and I was disappointed to find that it was perfectly fine. I repacked anyway. | ||
| Oldog |
The newer 'traps have a bag setup after about 8k or so some of the packing was burned out (2 holes about the size of a quarter) | ||
| S2tbolt |
17 discs in mine (w/ jet kit & thunderslide). Sounds good, performs better! Maybe the Thunderstorm kit has a little something to do with that too  | ||
| Easy_rider |
I've got the Buell version as well. I started with a stack of 20-24 discs. It was very deep, but very loud. I could set off car alarms in the parking lot at work! I kept taking a few out and couldn't really tell much difference. I finally took all of the discs out. It's quieter, but sounds rattier, too. I didn't think there was any matting in a supertrapp-style muffler... |
