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Re: Getting rid or exhaust "drone"
[Re: Mike H]
#333384
05/30/09 08:41 PM
05/30/09 08:41 PM
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Joined: Jul 2005
Posts: 1,624
qc
mxbeep
top fuel
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top fuel
Joined: Jul 2005
Posts: 1,624
qc
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Quote:
I have the same problem with a 440-6 69 Roadrunner, factory cast iron manifolds, new TTI exhaust system for the rest. The system resonates inside the car so badly you almost cannot drive it. I was told to replace the mufflers with "hemi mufflers", whatever that means. When I restored my Challenger (383, stock), I promised myself to never do the TTI thing again. I used a stock system from Accurate Exhaust. Beautiful. Sounds like it did originally. When I get around to re-doing my Roadrunner, that TTI crap will go in the trash in favor of a stock muffler and resonator system.
I used tti kits on both our b-body 440+6 cars and have no drone whatsoever, 1 car even as headers and mopar 528 cam.
I can barelly ear the exhaust noise from inside the car
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Re: Getting rid or exhaust "drone"
[Re: hemibeep]
#333386
05/30/09 10:08 PM
05/30/09 10:08 PM
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Joined: Aug 2003
Posts: 869
Avondale AZ
Prodart440
super stock
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super stock
Joined: Aug 2003
Posts: 869
Avondale AZ
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I had the same problem on my 71 cuda 440. As soon as I took the manifolds off and put the headers on the drone was gone. It was much faster, and much nicer to drive.
Aaron
68 Roadrunner 383/AT
69 Dart GT Conv. 383/AT
05 Dodge Ram 4x4 Cummins
06 GoManGo R/T Daytona #757
68 Coronet 440
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Re: Getting rid or exhaust "drone"
[Re: OA5599]
#333389
05/31/09 11:35 PM
05/31/09 11:35 PM
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Joined: Sep 2004
Posts: 6,906
IL, Aurora
ademon
master
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master
Joined: Sep 2004
Posts: 6,906
IL, Aurora
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Most of the problems are when using the factory exhaust manifolds my hand built system with factory manifolds, x pipe, dynomax Hemi mufflers 20" case, flowmasters tailpipes to tips, did the same thing as the original poster describes, i installed magnaflow resonators made of SS with SS packing, now very quiet !!
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Re: Getting rid or exhaust "drone"
[Re: ademon]
#333390
06/01/09 05:34 AM
06/01/09 05:34 AM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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exhaust drone is actually a resonance, where the whole system is allowing the sound waves to basically "build up" and create the drone...kinda like blowing air over the top of an empty coke bottle.
and, every car combo is different! only way to figure it out yourself, is to experiment, change the length of the tail piples if you want, change the mufflers, add an H or X pipe, if you already have one, then try it without...
**Photobucket sucks**
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Re: Getting rid or exhaust "drone"
[Re: 70Cuda383]
#333391
06/01/09 08:10 AM
06/01/09 08:10 AM
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Joined: Apr 2005
Posts: 4,980
new berlin wisconsin
Mr T2U
master
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master
Joined: Apr 2005
Posts: 4,980
new berlin wisconsin
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on my 72 road runner, 572 hemi TTI big tube headers hooker areo chamber mufflers 3" X pipe exhaust, i had a exhaust drone. i changed the 3" tail pipes to 2 1/2" and now it sounds perfect. i put the car on a chassis dyno to measure hp loss. i lost 2hp with the change, but it was also 10 degrees warmer when i dynoed it the second time, so in my opinion there was no loss of hp with smaller tail pipes.
perception is 90% of reality
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Re: Getting rid or exhaust "drone"
[Re: 70Cuda383]
#333392
06/01/09 10:09 AM
06/01/09 10:09 AM
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Joined: Jan 2003
Posts: 5,186
Wherever I am.
Junky
master
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master
Joined: Jan 2003
Posts: 5,186
Wherever I am.
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Quote:
exhaust drone is actually a resonance, where the whole system is allowing the sound waves to basically "build up" and create the drone...kinda like blowing air over the top of an empty coke bottle.
and, every car combo is different! only way to figure it out yourself, is to experiment, change the length of the tail piples if you want, change the mufflers, add an H or X pipe, if you already have one, then try it without...
 I had that somewhat even with an H-pipe. Switched to an X-pipe. That fixed it.  I like the tone now, too. Can hardly hear the exhaust from within the car at cruise.
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Re: Getting rid or exhaust "drone"
[Re: 6T6Cuda]
#333395
06/02/09 12:16 PM
06/02/09 12:16 PM
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Joined: Jan 2003
Posts: 9,838
Detroit, Michigan, USA!
peelerboy
master
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master
Joined: Jan 2003
Posts: 9,838
Detroit, Michigan, USA!
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Quote:
So does the exhaust drone come from the "sound" or from the "sound" resonating the pipes.
If from the latter then I need to modify the mount points to change the node points, if from the former changing the muffer or something should make a difference.
Anyone know what is the root cause cause of the "drone"??
Please see 70Cuda383's post:
Quote:
exhaust drone is actually a resonance, where the whole system is allowing the sound waves to basically "build up" and create the drone...kinda like blowing air over the top of an empty coke bottle.
and, every car combo is different! only way to figure it out yourself, is to experiment, change the length of the tail piples if you want, change the mufflers, add an H or X pipe, if you already have one, then try it without...
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