Da Groj

I'm looking for something that I can add on to a straight pipe exhaust to quiet things down for running in areas that LOUD exhaust can be a problem. Anyone have any experience with SuperTrapp products? This looks like it would fit and is short enough that I would not have to fab up any additional supports. I just don't know how much effect on sound these have.

http://cgi.ebay.com/ebaymotors/SuperTra" onclick="window.open(this.href);return false; ... dZViewItem


Other ideas welcome!!

That will do the trick.

Supertrapps arent' "quiet", but you can usually cut enough noise with one to be okay. More discs = more flow and more noise. You'll have to remove discs to make it quieter.

Thanks. I am going to give one a try.

Ordered the Super Trapp today. I also heard from a couple folks who had used them on their Vee's who said that they had to go down to three plates in order to lower the volume enough. This created some 'choking' of the engine. In an attempt to lower the sound some in another way so I will not have to remove so many plates, I installed a baffle.

My hope is to not create as much back pressure by combining the baffle with the Super Trapp.

There was only a small spark arrestor in the pipe which I removed:


The baffle was too long for the collector tube, but easy to cut:


Wrapped the cut down baffle in the supplied Fiberglass cloth:


Installed using the same holes the spark arrestor used:


It made a difference. I don't know if this combo method will result in less back pressure or not. But that is what I'm hoping for. Super Trapp sells combo units, but not as a 'shorty' with a 3" intake.

Anyone have a DB meter?

Scott

you could weld in a 27 inch resonator that would make your car really quiet or try and 18 inch one.

sccanissan wrote:you could weld in a 27 inch resonator that would make your car really quiet or try and 18 inch one.

Ended up going that direction. The baffle seemed to really choke the engine down. So, I went with a Vibrant 12 inch resonator and a Supertrapp. Just the resonator made a huge difference. Maybe even enough for the 'quieter' venues. With the Super Trapp on as well, it is quiet enough that I can run up and down our street without drawing any attention at all. Even with no disks removed! Kind of a Stratotanker look, but it will work when needed.

They are pretty respected on enduro bikes, back in the day. Also had this adjustable feature adding or subtracting baffles
engine size might be the limiting factor, I dunno if the bike muffler will cut it on a real big motor

A simple 90 degree "downturn" can work wonders too, it causes zero backpressure and forces 100% of the noise to be "reflected" off the pavement. which while hard, your still going to get a significant wavelength loss.

Scott, I assume you were running the open exhaust at Brooksville, right? You'll definitely need to button it down for Lakeland. I believe the site is right in a residential area.

Yes, I am bringing a resonator with a SuperTrap tip. Much quieter.

I also picked up a supply of disposable ear plugs to give the starters in 'non-noise' restricted venues.

Thanks for the heads-up.

Yes I would have to agree that some noise control may need to be used at the Lakeland site. it is pretty close to to residential area (but only on one side nad not much closer than St Pete) and if we can not get unwanted attention from the start will make it some place we can still use in the future if we dicide that we like it there.