silencer ring, remove or not
 

I took off the tube going to the silencer ring, I was going to remove it after reading some posts about it, then after looking at it, it seems it is designed as a radiused air inlet into the blades for the turbo

I would think removing it might cause some strange turbulence, in effect the same as as an air breather for a carb, one of the things we always did with performance carbs when running anything but a stack was to be sure to have a nice radiused "ramp" so to speak so the air would flow smoothly into the venturi from the air breathers.

like I said I'm not a diesel guy but air flow has to still have an effect into the turbo?

i removed mine, as well as hundreds of others, and there is nothing negative by taking the baffles out. there is also another piece on the tube connected directly to the turbo, and i removed that as well. the turbo is louder, the exhaust is louder, my turbo temps are lower, and it spools faster. didn't notice anything with the mpg, so i don't think it does anything for that.

you can also view this as a free way of making your own cai. if you were to buy after market, the cai that replaces all the tubing from the turbo is wide open, no baffles of anything of the such, so that tells me it's ok.

hope this helps.

yup, but I wasn't talking about the tube as much as the ring, I see where the flow might be helped with the removal of the baffle (maybe not the curved one in the lower elbow as much as the piece that looks like a + with the small holes in there.

The ring that is held in the turbo with the snap ring looks to have been designed to help air flow more smoothly into the turbo, or is everyone talking about just removing the baffles and not that radiused piece? and I'm not dumb enough to have thought otherwise? BTW thanks for help

Some folks have experienced a slight reduction in boost pressure and even turbo bark with the removal of the silencer ring. It helps direct the air over the impellers on the turbo, and the only real advantage of its removal is you hear the turbo sing.

The baffles on the other hand, can go "bye bye". Cut them out or just drop a boost tube in its place .... all they do is muffler the sound of rushing air through the intake.





Kris

What is Turbo bark? and I assume they noticed the loss of boost pressure because they saw it on a gauge? I don't have a boost gauge in my truck, it is all factory so far..... b ut I could see removing the silencer ring causing some loss, BTW thanks!

Tom

People have been removing them for many years...no real negative affects. Supposedly the aftermarket doesn't install them.

I've noticed in two trucks I've owned that mileage in town dropped slightly. I ran the first one 200k and this one has 245k (not all with the ring removed however). I've reinstalled the one in my 04.5, mainly because of the noise during long trips.

thanks, for now I will leave the silencer ring in, although it would be cool to hear the turbo a tad more, I am more into the performance and mpg over noise,

That's just it, the noise. You have to speak up a little more so you can hear each other. I'd rather listen to tire noise, than a whistle. :humm:

If I drove local, I'd probably have it out...but driving for 16 hours at a stretch, and trying to talk on the phone...it sucks.

No gain except a cool noise lol

I've never really heard a difference on a 3rd generation with it removed. Maybe because the straight-pipe covers the noise.
In the 2nd gen., you can definitely hear the difference, though.
As far as a turbulent flow, we were thinking the same...

Turbo bark is best described as being similar to a backfire in a gasser. It's a sudden pressure increase that the wastegate can't get rid of so it tries to come out the way it came in; through the turbo intake.

You'll know if you do it because of how odd it sounds .... like a burp or "bark".




Kris

had the silencer ring removed for bit now love the sound, Even better unload when you going thought a sleepy little town with about 3,000 pounds behind you get some real head turners also i do see gain in towing with shifting and turbo spools faster.

on side note my friend has 07 6.7 cummins intake mod and silencer ring removel good idea or not ? he already hates the truck not the motor but when buy something used it not gonna be perfect need some front work and now he thinks the trans is starting to go but only when it tow car (it's tow truck Chassie Cab DRW) the truck is really nice i would hate to see him get rid of cause little issues, cause i really like the truck myself cause i do get to drive it once in while and i like it cause well you guess it IT'S CUMMINS !!

Drill a few small holes in the ring, about 1/4 inch. 4 or 5 evenly spaced. You will get a bit more turbo whistle, but not too loud compared to not having it. More sound, more holes. Plus, you can still still have the benefits (if any) that the ring incurrs. My next door neighbor did just that this past Sunday after installing his Afe open element CAI. He first pulled the ring and it was way too loud for him. Just for S&G's, he drilled five 1/4" holes in the ring and reinstalled it. I told him i would give him my ring if he didnt like the sound. It Actually worked. Sounds good, but not too loud that it gets irritating. He's happy with it.

I tried both ways with the s&b intake. Could not hear it hardly at all with intake and then removed it and you sure can hear it now. When towing my boat it really sings.

Ya just gotta love the sound:rocking: But even for me it got quite annoying as I drove to, and returned from a 4-day camping trip, 3 hours each way, as I pulled my 28ft travel trailer. Way too loud. So, Im gonna do what my neighbor did with his silencer ring. That is, drill several 1/4 inch holes, evenly spaced, and re-install it. We'll see how it goes.

Well, I did it. I dug up my silencer ring and drilled six(6) 1/4 inch holes, evenly spaced. I installed it and took it for a test drive. The turbo still sings, but its not as loud as it was with out it. I hooked up my travel trailer and went for about a 20 mile drive on the hwy, with the passenger window down. Its a bit louder, under load, but sounds good and not crazy loud as it was before. I like it!! Maybe Im on to something here.:humm: It could be a happy medium...........

I am going to remove mine. Id rather hear the whine then my wife talken any way

Okay...............moving right along................:choochoo:

mines been off for like 30k and i love it!

I took mine out about 100k ago and love the sound, which is all it did nothing else positive or negative

Im not sure about this, so dont quote me but I have been shopping for aftermarket turbos. I was initially reluctant to remove the ring because of the (minimal) negative feedback. Looking at the aftermarket turbos none of which I have seen have a turbo silencer ring. Are you supposed to pull your old one and put it in? Makes me wonder if there are really any negative sides to removing the ring. I would think that if it were essential for correct airflow the aftermarket turbos would come with them as well or require you to use your old silencer.
As for the lower psi I cant explain, but I have heard lowered mpg...but I think thats from a heavy foot wanting to hear the turbo.

BWD

If it bothers you that much, then just leave it in and call it a day. This is a never ending debate on this particular topic. Its been debated over and over on other forums as well. There is no real clear answer to this. DC put in the "silencer ring" to silence the turbo noise, so customers wouldnt hear it. Some people like turbo noise, some dont. I found a happy medium (for me anyway) by drilling six 1/4" holes, evenly spaced, and put it back in. My turbo still sings, but its not crazy loud, especially towing.

I just took the ring out on my lunch break. I only got to drive around the block and never went past 35mph, but I didnt see any difference at all. Maybe after running temp and higher speeds it will be different, if not its going back in. Assuming an aftermarket intake may allow more resonance, but that wont be for a while.

And then there was the TAG...for those of you worried about air flow into the turbo.

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I had a TAG for a couple years. Actually made a difference, especially for towing. But the plastic housing cracked in half, and I threw it away. I think its a great concept, but the housing material, being plastic, is quite substandard. The TAG for 03-07 CTD is not being made anymore. In fact theyre really hard to come by now. Id kinda like to have another one. I searched for a replacement, but finally gave up the search.

Just got to drive her...not impressed. the higher RPM seems to whistle a little louder, or it was just me paying attention more with my foot in the gas...I dont know. However, the spool down whistle is completely gone. Before when I let of the pedal you could hear the turbo spool down and it was fairly prominent...now its gone. Not that I give a crap, I just wanted to see what all the fuss was about with this silencer ring. Im sure different generation trucks are all effected differently and im sure an air intake, injectors, programmer would make a difference...but the ring is going back in for now. This fall I am swapping turbos and adding all my goodies. Leaning toward a compound setup more than the HE351VE with the controller. Not sure at this point. The whistle is 'cool', but I could really care less. I just wanted to see for myself.

BWD

It doesnt bother me, seems to bother other people more. As long as she runs good im happy. I guess if you want your truck to sound like a jet, go get a Dmax or stroke...ill take a Cummins rattler any day

A compound set up would be awsome for sure. You would certainly have bragging rights. I do like to hear a little bit of turbo music, but not too much. Im more concerned about my truck running efficiently, than blowing smoke and burning rubber (thats cool too but its not really for me). Thats why my mods are conservative. I rely heavily on my rig, so keeping it practical works for me. Besides, I have another toy to play with as indicated in my sig.:c: