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Re: Getting rid or exhaust "drone"
[Re: 360view]
#333398
06/06/09 05:30 PM
06/06/09 05:30 PM
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Joined: May 2008
Posts: 1,131
Thigh-Gap Junction
@#$%&*!
New user name, Same old jerk!
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New user name, Same old jerk!
Joined: May 2008
Posts: 1,131
Thigh-Gap Junction
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Quote:
the noisy resonance depends on the
temperature & pressure of the exhaust gas too
(for geeks: actually the speed of sound for that gas condition)
Good post.
My charger had it bad when it was running lean. Once I got the fuel mix to where the engine was most happy it was much quieter, but not completely gone. I figure the exhaust was cooler and more dense shifting the natural frequency of the pipes.
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Re: Getting rid or exhaust "drone"
[Re: @#$%&*!]
#333399
06/06/09 05:42 PM
06/06/09 05:42 PM
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Joined: Jan 2003
Posts: 549
Bristol, Va
fasteddie
mopar
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mopar
Joined: Jan 2003
Posts: 549
Bristol, Va
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I just changed the exhaust on the Dart. Went from a 2 1/2 inch with an H pipe and Flowmasters to 3 inch with an X pipe and DynoMax Ultraflows. Both dumped in front of the axle.
Picked up 2 tenths and 2 mph but the exhaust note is somewhat quieter and the bass is gone. I miss the bass sound. I guess this is the drone being talked about.
But this is a bracket car. It would probably drive me deaf if it were a car I drove alot.
2003 Bristol Dragway Sportsman Champion
2016 Bristol Dragway Power Hour Champion
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Re: Getting rid or exhaust "drone"
[Re: Junky]
#333401
04/25/10 07:31 AM
04/25/10 07:31 AM
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Joined: Jun 2008
Posts: 10,958
Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,958
Oakdale CT
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Quote:
 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.
I have a Summit system on my Duster (Factory manifolds with 2.5" duals with Summit mufflers & talpipes) and since I changed the rear axle ratio (2.45 -> 3.55) 2 days ago the car drones so bad on the highway after a one hour drive I can't stand it.
Will try a H or X pipe first to see if that changes the frequency point.
One step forward with the gears, 3 back with new exhaust drone, new driveshaft vibration and new alternator howl at cruise rpm.
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Re: Getting rid or exhaust "drone"
[Re: Mike H]
#333402
04/25/10 07:47 AM
04/25/10 07:47 AM
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Joined: Jan 2003
Posts: 2,410
Wichita,KS
Blakcharger440
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,410
Wichita,KS
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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.
A buddy of mine purchased the TTI kit also and it has horrible drone with full exhaust out the back.
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Re: Getting rid or exhaust "drone"
[Re: Dougsmopars]
#333405
04/25/10 08:57 AM
04/25/10 08:57 AM
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Joined: Jun 2008
Posts: 10,958
Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,958
Oakdale CT
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Quote:
I have a stock style 2 1/2 system with Hemi style mufflers. It was surprisingly loud and had a bad drone around 2000 rpm. Installed 4 inch magnaflow glass packs as resonators. Sound is fantastic now. Drone is gone. Nice muscle car thump at idle but not outrageous at WOT. Worked out great.
Wish that was an option for me, darn A-body.
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Re: Getting rid or exhaust "drone"
[Re: rapom]
#333408
04/28/10 07:24 AM
04/28/10 07:24 AM
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Joined: Aug 2004
Posts: 1,960
Kenosha, Wi
GOLDMYN
top fuel
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top fuel
Joined: Aug 2004
Posts: 1,960
Kenosha, Wi
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any chance you can post a pix, I'm unable to get a pix from the link....thanks
Semper Fi
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Re: Getting rid or exhaust "drone"
[Re: Snoopy]
#333415
04/28/10 02:17 PM
04/28/10 02:17 PM
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Joined: Jan 2003
Posts: 1,883
Northern OH
rapom
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,883
Northern OH
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You can supposedly install these anywhere and they will work. Even in front of the mufflers like the truck guys. I have a crossover exhaust on my Trans Am and I had an H pipe on my truck and they still drone. Not sure sure if they are properly located but sometimes you don't have to many location choices.
As I said, the is my wife's car and she wanted in quiet and I wanted a cheap guarranted fix.
Last edited by rapom; 04/28/10 02:21 PM.
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