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TNT Mufflers

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TNT Mufflers

Post by milspec6 on Sat Jul 09, 2016 5:13 pm

I need to replace my muffler on my TNT. I was looking over options and find this frustrating.

Standard turbo mufflers are horribly loud and very tinny in sound....not acceptable.

I tested out a Thrush Welded turbo muffler with dual chambers and the tone was far improved...deeper instead of tinny, but the flow rate is a concern. Thrush doesn't list the flow rate, but their muffler is actually a China clone of the old Flowmaster 40 turbo muffler which is around 352 cfm for a 2.5 pipe.

If I am not wrong, the TNT uses blowers with cfm ratings of 376 - 395 depending on whether yours has the Roots 45 or the Sutobilt 4M. If those numbers are correct, then the Thrush / Flowmaster would be choking the blower a little. I don't want to do that either.

The other option would be a Dynomax Ultra-Flow welded muffler which flows up to 1,000 cfm, but tends to drone at high rpms. I don't really care for that either although I have not tested one yet to see what the tone would be like.

I would rather install a used silencer that I have left over from my Butler repairs, but it weighs almost 100 lbs and would need to be mounted above the machine instead of under the cargo box due to routing issues. It would greatly lower the sound, but the negatives to that set-up make me want to keep this simple.

What mufflers are you guys using out there and are my numbers correct on the blowers? I would really like to go with the Thrush / Flowmaster 40 at this point, but I am open to ideas.

I might have to test these two out and run cfm tests on them to see if my understanding is correct.
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Re: TNT Mufflers

Post by ACE Services on Sat Jul 09, 2016 7:27 pm

Try looking at a truck muffler that is a flow threw instead of turbo. Should be a larger diameter and longer which should give it a deeper tone. Never tried it just a thought.
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Re: TNT Mufflers

Post by milspec6 on Sat Jul 09, 2016 7:51 pm

Not a bad thought, but I tried that on my Butler before going back to a silencer. I had the shop install the largest truck muffler that they could fit...it was off a semi and was 4 feet long.....it was horrible! The sound level was okay at 88 db, but the pitch was so bad that I was getting complaints.

That Thrush / Flowmaster 40 are dual chambers so it would be like having 2 universal turbo mufflers in-line with each other which I hear works well and it did sound deeper with the one that I tried.

It is just the cfm issue that concerns me.
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Re: TNT Mufflers

Post by ACE Services on Sun Jul 10, 2016 5:07 am

Maybe just easier to just order one from Les, at judson
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Re: TNT Mufflers

Post by Mo on Sun Jul 10, 2016 6:21 am

When I was at ICE a couple of years ago the TNT Les had on display had a truck muffler on it. I would call Les get that part number from him and compare the specs with the one that you tried to see if there are any differences.
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Re: TNT Mufflers

Post by milspec6 on Sun Jul 10, 2016 11:52 am

I tried that actually. The response I got from Les was to just run dual turbo mufflers inline with one beneath the truck. He said that was the best way to go these days.

I think I am on my own with this one.....trial and error time.
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Re: TNT Mufflers

Post by ACE Services on Sun Jul 10, 2016 5:22 pm

Ok, I've got two tnt units to service this week I will look at the mufflers and see if there are any numbers on them
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Re: TNT Mufflers

Post by ACE Services on Mon Jul 11, 2016 4:44 am

Lol it just hit me this is what got me in trouble on another board. Trying to be helpful giving free information at no charge. Dang hope I'm not in trouble again HONESTLY.
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Re: TNT Mufflers

Post by ACE Services on Tue Jul 12, 2016 6:19 am

https://search.yahoo.com/search;_ylt=A0LEVz9l7IRXtMEAMIdXNyoA;_ylu=X3oDMTE3Y2g5Y2YwBGNvbG8DYmYxBHBvcwMxBHZ0aWQDQjIyNDJfMQRzZWMDcXNzLXFydw--?ei=UTF-8&fr=yfp-t-828989-s&fp=1&p=dynomax+17733+muffler&fr2=12642
This is the muffler assy that came on the tnt unit I am working on. Dynomax 17733.
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Re: TNT Mufflers

Post by milspec6 on Tue Jul 12, 2016 11:28 am

That is the one that is on mine as well.  I think there is room for improvement.

(BTW, those flow at 700 cfm)
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Re: TNT Mufflers

Post by milspec6 on Tue Jul 12, 2016 11:54 am

I contacted both Thrush (Dynomax owned) and Flowmaster to find out the specs. I know that both mufflers have been known for lower flow rates than most turbo style mufflers so they may not work.

What specs I do find for similar products are around 375 cfm which will not cut it. I am hoping for 500 cfm or greater, but I suspect that it will be well below 400 cfm.

I may not have any options available in the end and will just have to deal with the noise.
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Re: TNT Mufflers

Post by ACE Services on Tue Jul 12, 2016 1:50 pm

That is the factory installed muffler on the tnt both are the same. Checked the noise of both and its around 85 dB for both walking around the van about 5 to 6 ft away all the way around.
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Re: TNT Mufflers

Post by milspec6 on Tue Jul 12, 2016 2:27 pm

Thanks ACE, mine is a little louder than that, but it might be leaking at the connections as well....it doesn't look very tight.
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Re: TNT Mufflers

Post by Ryan S on Thu Jul 14, 2016 5:35 pm

Did you guys see my video on the blower restriction on the blower intact from the waste tank?

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Re: TNT Mufflers

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