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Exhaust Drone #1245338
06/04/12 04:05 PM
06/04/12 04:05 PM
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Michigan
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AnRT4Me Offline OP
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After restoring my 1970 Dodge Coronet RT Convertible a few years ago, I installed a complete 2 1/2 inch TTI H pipe exhaust system on my car. It came with DynoMax Turbo mufflers. They are oval, and the body of them is 20 inches long. The engine is a stock 440 4 bbl, auto trans. with stock exhaust manifolds on it. When cruising between 25 and 45 miles per hour the drone is deaffening!!!!! Once I hit 50 miles per hour and up, it fades into a nice tolerable rumble. But upon letting off the gas pedal and the speed hits 45 MPH and lower, the drone comes back. I called the tech. dept. at DynoMax and they told me it is a 3 chamber muffler and the quietest one they make. Anyone else out there in Mopar Land that has dealt successfully with this problem? Any other mufflers out there that would have a LIGHT RUMBLE WITHOUT the DRONE? Thanks for any and all replies!

Re: Exhaust Drone [Re: AnRT4Me] #1245339
06/04/12 04:45 PM
06/04/12 04:45 PM
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Lincoln Nebraska
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RapidRobert Offline
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in addition add a pair of glasspack type muffs alongside the leaf springs to act as resonators


live every 24 hour block of time like it's your last day on earth
Re: Exhaust Drone [Re: AnRT4Me] #1245340
06/04/12 05:02 PM
06/04/12 05:02 PM
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Northern OH
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rapom Offline
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Do a search on Moparts. Lots of info on this topic. Just look back one week and you will find stuff. https://board.moparts.org/ubbthreads/show...e=3#Post7227740

Last edited by rapom; 06/04/12 05:06 PM.
Re: Exhaust Drone [Re: RapidRobert] #1245341
06/04/12 05:04 PM
06/04/12 05:04 PM
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Grand Haven, MI
patrick Offline
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this is probably your best bet, as the drone RPM/speed has to do with the resonant frequency of the pipe, which is dependent on it's length (think of a church organ) another option might be to try the dynomax VT series mufflers...


1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
Re: Exhaust Drone [Re: patrick] #1245342
06/04/12 05:13 PM
06/04/12 05:13 PM
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Kent, Wa
340SHORTY Offline
Truck Nut
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Kent, Wa
If I said it once Ive said it a hundred times

HOOKER AERO CHAMBERS


I am truckless..
Re: Exhaust Drone [Re: 340SHORTY] #1245343
06/04/12 05:24 PM
06/04/12 05:24 PM
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North Carolina, USA
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Silverbullet2 Offline
mopar
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North Carolina, USA
Yeah I've got the 3 inch system with 4.10 gears and it is nasty. It's about a zero loss muffler though... I considered the resonator idea. That would probably tone it down.

Re: Exhaust Drone [Re: AnRT4Me] #1245344
06/04/12 07:20 PM
06/04/12 07:20 PM
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Santa Cruz, California
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Lefty Offline
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Quote:

It came with DynoMax Turbo mufflers. They are oval, and the body of them is 20 inches long




That's strange to me as my 66 Coronet convertible w/440 RB; Dougs 2" headers and 2.5" exhaust has no drone whatsoever. I wonder if the 3" pipes is a factor? Or maybe how their hung under the car?

I've been recommending these mufflers since I put them on the car thinking they were the best, but maybe not...

These are they -

http://www.jegs.com/i/Dynomax/289/17749/10002/-1?parentProductId=

Re: Exhaust Drone [Re: 340SHORTY] #1245345
06/04/12 07:26 PM
06/04/12 07:26 PM
Joined: Jan 2012
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Harm City Md.
Dan Halen Offline
top fuel
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Quote:

If I said it once Ive said it a hundred times

HOOKER AERO CHAMBERS




Y-E-S!!!!!! I love aerochambers!!

Re: Exhaust Drone [Re: Lefty] #1245346
06/04/12 07:29 PM
06/04/12 07:29 PM
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Iowa State fan
kilroy Offline
super stock
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Iowa State fan
Ive been wondering if some of the drone we all are fighting is the actual muffler is acting like a drum. Maybe by wrapping some fireproof blanket of whatever and then putting some band clamp that you can tighten TIGHT around the muffler to take the high (low?) frequency vibration out.

I havent found a big enough fiberglass blanket yet to try it myself.


1973 Charger, former SE, former auto

I'm not trying to be difficult, it comes naturally....
Re: Exhaust Drone [Re: kilroy] #1245347
06/04/12 08:28 PM
06/04/12 08:28 PM
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Answering the call of the wild
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ThermoQuad Offline
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Answering the call of the wild
Many times drone is caused by the car's state of tune, which typically means the car needs tuning.

Re: Exhaust Drone [Re: kilroy] #1245348
06/04/12 08:35 PM
06/04/12 08:35 PM
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Michigan
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AnRT4Me Offline OP
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Michigan
Thanks for all of the replies so far, as I will be trying some of these suggestions to get my exhaust OUT OF THE DRONE ZONE!!!!!

Re: Exhaust Drone [Re: AnRT4Me] #1245349
06/04/12 09:25 PM
06/04/12 09:25 PM
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Lost and Spaced
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bboogieart Offline
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Do your pipes extend passed the rear bumper?


I have mechanical Aptitude.
I can screw up anything.
Re: Exhaust Drone [Re: bboogieart] #1245350
06/05/12 09:19 AM
06/05/12 09:19 AM
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Here and now
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jeebis44 Offline
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I have the same problem in my '66 300 w/ 383 and 2.25" straight duals. Mine do come out a few inches past the rear bumper... would adding an x-pipe crossover help?

Re: Exhaust Drone [Re: jeebis44] #1245351
06/05/12 02:05 PM
06/05/12 02:05 PM
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Carson City, NV
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babarracuda Offline
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I have TTI 3" X pipe exhaust through the super turbo mufflers and 2 1/2" tail pipes. I bought Summit 12" glass packs to cure the drone. If I had more money, I would have bought ultra flows instead of glass packs. I am an old racer and hate giving away any performance.

Re: Exhaust Drone [Re: babarracuda] #1245352
06/10/12 11:48 PM
06/10/12 11:48 PM
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Posts: 43
Michigan
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AnRT4Me Offline OP
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Michigan
My exhaust has the stainless TTI tips that extend out under the rear bumper at least 2 inches. I found a set of 10 inch long stainless steel resonators on ebay which I hope to get early this week and install them just in front of the rear tips. I will post the results once I put them on. Thanks again for all the help and suggesstions. MOPARS RULE!!!!!

Re: Exhaust Drone [Re: AnRT4Me] #1245353
06/11/12 12:32 AM
06/11/12 12:32 AM
Joined: Dec 2003
Posts: 36,840
South San Francisco, Californi...
MidPenMopar Offline
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South San Francisco, Californi...
I just put on these sidepipes after taking off the 3 inch TTI with Dynomax mufflers and no more drone! Yea!!!

Re: Exhaust Drone [Re: AnRT4Me] #1245354
08/12/12 12:21 AM
08/12/12 12:21 AM
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mnguy55 Offline
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Quote:

Thanks for all of the replies so far, as I will be trying some of these suggestions to get my exhaust OUT OF THE DRONE ZONE!!!!!




I wish I had seen this post before I bought my TTI system. I have a 70 Charger R/T. I just put on the same system you have and it's exactly the same, terrible drone at about 40 MPH. I called TTI and they said they had never heard of a issue with drone with this system. Apparently I'm not the only one.

Have you tried anything yet? I replaced the Dynomax Super Turbos with Thrush Turbos. Same size but different internals. It helped a little but not enough.

Re: Exhaust Drone [Re: mnguy55] #1245355
08/12/12 12:27 AM
08/12/12 12:27 AM
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Memphis
HemiRick Offline
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Memphis
I've noticed the last few times I've driven my Challenger that used to drone, that it has stopped.
Nothing has changed in the TTi 2.5 x pipe exhaust system. I'm glad the drone was annoying.


Take care,
Rick
68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
Re: Exhaust Drone [Re: HemiRick] #1245356
08/12/12 02:21 AM
08/12/12 02:21 AM
Joined: Aug 2003
Posts: 12,291
Kent, Wa
340SHORTY Offline
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Quote:

I've noticed the last few times I've driven my Challenger that used to drone, that it has stopped.
Nothing has changed in the TTi 2.5 x pipe exhaust system. I'm glad the drone was annoying.




Thats because youve gone deaf listening to them. lol


I am truckless..
Re: Exhaust Drone [Re: 340SHORTY] #1245357
08/12/12 07:52 AM
08/12/12 07:52 AM
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Posts: 5,336
the house on the left.
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cogen80 Offline
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