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Old 10-15-2012, 11:35 AM   #11
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Re: Got a Flowmaster Series 70 - DRONE!!

Bringing this thread back up, because I think I might have found a very affordable solution.

I have a E350 7.3 EB50 SMB with the 4" turbo back Diamond Eye exhaust without a muffler.

Noticeable drone for about 400 rpm. Usually under load. I use ear plugs to retain what little hearing I have left.

Did some research and came across:
http://www.ftediesel.com/store/pc/viewP ... category=7

All the truck guys on the Cummins forum use it with rave reviews. I just got off the phone with Wally, the owner of FTE. Good dude, usually has resonators in stock and ships right away. He makes his stuff in OH and not from China.

I'm not a great note taker but here's the gist:
Drone (sound and vibration experienced inside the van) is caused by the turbulence from the airflow through your exhaust, causing vibration and our van floor and van cabin act as a speaker for this vibration. Vibration = sound similar to a tuning fork. With his resonator it smooths out the flow of air and thus causes less vibration and sound inside the van. Turbulence starts as soon as air leaves the turbo so he recommends installing the resonator as close to the front as possible. He said his product doesn't do much for sound outside the van. That's what mufflers are for. Also, that's not my concern either. I love how my exhaust sounds outside the van, not so much inside.

Excited to try this out. Will report back once its installed.
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Old 10-19-2012, 04:50 PM   #12
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Got a Flowmaster Series 70 - DRONE!!

I'm guessing 80% reduction of in cab noise with the resonator installed. Well worth it.

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Old 10-19-2012, 07:03 PM   #13
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Re: Got a Flowmaster Series 70 - DRONE!!

Do you measure EGTs? I'm wondering if there's a before and after difference?


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Old 10-20-2012, 10:42 AM   #14
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Got a Flowmaster Series 70 - DRONE!!

Quote:
Originally Posted by BroncoHauler
Do you measure EGTs? I'm wondering if there's a before and after difference?


Herb
I totally forgot to check the before egt.

Ftediesel is the manuf and their claims is that egt and back flown pressure remains unchanged.

No one seems to comlpain about this piece on the Cummins forum.
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Old 11-27-2012, 06:22 PM   #15
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Re: Got a Flowmaster Series 70 - DRONE!!

Take a tip from my man Bub Rub, install a whistle tip... for decoration, that is. The drone goes away

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Old 11-29-2012, 09:20 PM   #16
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Re: Got a Flowmaster Series 70 - DRONE!!

Oh, thanks! Let just add more road rage. I hope those idiots don't move east about a hundred miles Makes me think of Arlo Guthrie
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Old 11-30-2012, 09:19 AM   #17
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Re: Got a Flowmaster Series 70 - DRONE!!

Quote:
Originally Posted by daveb
Oh, thanks! Let just add more road rage. I hope those idiots don't move east about a hundred miles Makes me think of Arlo Guthrie
Dave, that was shared in good fun...

that KTVU news report is about 10 years old I think, yet the way my mind works, anytime someone brings up exhaust note, I think back to that absurd channel 2 'whistle tip fad' news report. Wrong on so many levels I know, but makes me belly-laugh none the less. "The whistles go whoo-WHOOOOOO!"

Sorry for the thread high-jack
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