BOMB'd Silencer Ring? - Need your Input

[boonsur]

When I had the stock air intake, I removed the silencer ring and liked it. After upgrading to a new airbox / K&N RE0880, the noise increase was too much (hearing loss time). I put the silencer ring back in; now it's too quiet. I want to be able to hear it working, but don't want the ear-piercing, shrill whistle.



I'm thinking of a modified silencer ring, which would make the noise "just-right". I have a couple of ideas:



Turing the I. D. bigger (not sure how much bigger).



Putting a series of holes/slots along the taper (not sure of quantity/configuration (one big slot, or a series of small ones, located at certain angles)).



Cutting (grinding) the back side on an "angle" (so one side would be "full-width", tapering to narrow strip 180* away).



????? Does anybody have any input ?????:



Have you tried this/does it seem like it would work?



Does anybody have extra rings, they could send me to experiment with?



Is there a way to do a test rig, using cardboard, etc. to determine the best ring geometry? I'm thinking of some sort of air turbine (such as a hair dryer). I would not want to run cardboard through my turbo, but the idea would save cost/time.



Please let me know what you think.

 

[RACE427]

silencer ring

How much could the silencer ring cost ? I would think just making it's diameter larger a little at a time would give you the sound you desire. I would cut out a little bit, maybe a 1/8 of an inch, and stop when it sounds good. Just a thought. Tony G

 

[DennyDay]

Silencer Ring

There were a whole string of posts on this subject several months ago. One of our members machined a replacement ring to cure this problem. Maybe some on will post with the info from the past

Denny

 

[.44 mag]

Just looking at the way things sit, I'd think you would have better performance with the ring in place. Am I nuts, or doesn't seem that air flow would be smoother with the ring funneling the air in rather than having all the exposed square edges with the ring out?

I pulled out my ring just to see what would happen. I don't really hear much change from the way it sounded with it in. What's the deal??



Hank

 

[boonsur]

Denny, I remember the post, but I thought the author was doing something different (silencer for bigger turbo, etc. ). I will do a search.



Hank, I believe there have been tests done, determining there is no performance gain/loss with/without the silencer ring. It is such a short length, there is no "pipe-flow restriction". It simply keeps the airflow away from the ends of the turbine blades, to prevent excessive turbulence (noise) from that area. The noise difference is not real noticeable with the stock box, because there isn't much air-flow anyway. Also, the cowl-fed airbox puts the noise right where you notice it. It sounds WAY good at low boost, but can get real obnoxious pulling a load at highway speeds.



ANOTHER ANGLE - Has anyone tried a piece of foam, etc. placed on the cab-side wall of the cowl to absorb some of the noise near the inlet tube? (before it bounces into the cab vents).

 

[DennyDay]

Silencer

Hank and Boonsur --- I think you are both right. I've had some more noise (whine) but no change in operation from the silencer ring removal. There is a bit of noise, probably air rushing over the sharp edges of the box. Again no noticable gain or problem.

The menber that was playing with the silencer ring mod went to a lot of trouble and cost to machine a replacement. Work caused me to lose track of the outcome of the project. I do know the member put alot of time into this.

Maybe he will come foreward again and provide an up date.

My BOMBING days are on hold following the fiasco of the sport headlight change over!

Denny

 

[EMDDIESEL]

Maybe you could try and use some think foam insulation on the portion of the firewall?. Dynamat has a type available that is 1/2" thick. That should cut the noise down a little. I always have the radio on, so i dont notice the turbo whine much at all. The only whineing i hear is my girlfriend.

 

[Archive]

I don't know if he is the only one, but I know he has done it, cause I saw it.



Cdaleh... old forums name.



Diesel Freak... new name.



Search for his posts... he even posted some pics.

 

[nixter]

trick silencer ring

Roadwarrior has this in his truck. Sounds great from outside of truck. He said it wasn't cheap or easy, maybe he'll respond with details. I forgot who took the pic, either nemies or dieselboy. (Just trying to credit photographer. )

 

[Paul]

Here are somw photos of the one I made.

 

[boonsur]

What is the big advantage of these plugs? Do they smooth out the flow better than the silencer ring, for some performance gain? Is the I. D. bigger than that of the stock silencer ring?



How do they sound? Is it the in-between noise I'm looking for?



How are they retained in the turbo housing? Is there a friction device, or does the hose trap it?

 

[SteveE]

Here's is what I had made for mine, I just wanted to smooth out the air flow in front of the turbo.

It started out as a piece of 6061 T-6 4" X 2. 5" barstock

Set screw holding it in place.

I can hear the sucking sound of air on acceleration .

Seems to have better low end, spools up quicker.

 

[Paul]

It is held in with a setscrew thru the turbo housing into the ring. I used a venturi design as in a velocity stack. As steveE has mentioned it seems to have improved low end response and has more of a "wooshing" sound when you jump on the GO pedal.

 

[SixShooter]

Another item to BOMB. Can Roadwarrior give some details on the specs for that contraption. I would like to make one since I have access to my own excellent machine shop near me. I think those would work better than no silencer ring. Just my opinion though. I like a wooshing sound.