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Exhaust Drone #1245338
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
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
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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
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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
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Harm City Md.
Dan Halen Offline
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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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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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ThermoQuad Offline
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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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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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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
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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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Michigan
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AnRT4Me Offline OP
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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
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South San Francisco, Californi...
MidPenMopar Offline
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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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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
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Kent, Wa
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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
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Re: Exhaust Drone [Re: AnRT4Me] #1245358
08/12/12 11:12 AM
08/12/12 11:12 AM
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I have the same exhaust system on my 74 Charger with a mild 440. I started with Spin Tech mufflers and the drone was a PIA. I made some inserts for the tail pipe that made it better, but was not the cure. I switched to Dyno Max and the drone was reduced.

2 most common causes for the dreaded drone:
1- The muffler resonates due to a free flowing design and the muffler casing vibrates like a speaker.
2- Tail pipe diameter is the same diameter as the pipes in front of the muffler. The exhaust cools somewhat and the tail pipes can become something like a megaphone. If the tail pipes are 1/4" smaller, drone decreases.

Re: Exhaust Drone [Re: 74RALLYE] #1245359
08/12/12 01:55 PM
08/12/12 01:55 PM
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S.I. N.Y.
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Cured my Dynomax UltraFlo drone with a pair of Magnaflow bullets on the tailpipes...Hemi style

7332166-resos4res.jpg (103 downloads)

1MYTGTX
Re: Exhaust Drone [Re: 1MYTGTX] #1245360
08/12/12 03:23 PM
08/12/12 03:23 PM
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mnguy55 Offline
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Quote:

Cured my Dynomax UltraFlo drone with a pair of Magnaflow bullets on the tailpipes...Hemi style




I'm interested in trying this. Can you tell me what magnaflow muffler you used? Did you weld the tip directly to the muffler or is there a short section of pipe connecting the two?

Re: Exhaust Drone [Re: mnguy55] #1245361
08/12/12 04:29 PM
08/12/12 04:29 PM
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S.W. Pennsylvania
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markrr Offline
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Quote:

Quote:

Cured my Dynomax UltraFlo drone with a pair of Magnaflow bullets on the tailpipes...Hemi style




I'm interested in trying this. Can you tell me what magnaflow muffler you used? Did you weld the tip directly to the muffler or is there a short section of pipe connecting the two?




Please let us know. I'm interested also.

Re: Exhaust Drone [Re: markrr] #1245362
08/12/12 08:33 PM
08/12/12 08:33 PM
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1MYTGTX Offline
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Quote:

Quote:

Quote:

Cured my Dynomax UltraFlo drone with a pair of Magnaflow bullets on the tailpipes...Hemi style




I'm interested in trying this. Can you tell me what magnaflow muffler you used? Did you weld the tip directly to the muffler or is there a short section of pipe connecting the two?




Please let us know. I'm interested also.




Thanks! Full write up here....

Magnaflow resonators


1MYTGTX
Re: Exhaust Drone [Re: 1MYTGTX] #1245363
08/12/12 11:24 PM
08/12/12 11:24 PM
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MN
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mnguy55 Offline
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Quote:

Quote:

Quote:

Quote:

Cured my Dynomax UltraFlo drone with a pair of Magnaflow bullets on the tailpipes...Hemi style




I'm interested in trying this. Can you tell me what magnaflow muffler you used? Did you weld the tip directly to the muffler or is there a short section of pipe connecting the two?




Please let us know. I'm interested also.




Thanks! Full write up here....

Magnaflow resonators





Thanks for the link. One more question. What tailpipes are you using? (Accurate, TTI, etc) I'm trying to figure out the longest resonator I can fit.

Re: Exhaust Drone [Re: mnguy55] #1245364
08/13/12 09:07 AM
08/13/12 09:07 AM
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Palmyra, NY
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63stabamatic Offline
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Thanks everyone. I've had the drone with my 2 1/2 inch TTI with H pipe and Dynomax on my 69GTX for years. After reading the posts I ordered a couple Jones 2 1/2 inch, 12" X 4" mufflers, Summit JEX-A4512B, to use as resonators. They're aluminized and a little smaller, just what I wanted. Will report back how they work.

Jim

Re: Exhaust Drone [Re: 63stabamatic] #1245365
08/13/12 10:32 AM
08/13/12 10:32 AM
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WV
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JohnH Offline
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What is the noise you all are calling drone? Ready to fire up my 440 with TTI's with mild muffles,, need to know what I might expect.... Thanks

Re: Exhaust Drone [Re: 63stabamatic] #1245366
08/13/12 10:49 AM
08/13/12 10:49 AM
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S.W. Pennsylvania
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markrr Offline
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Quote:

Thanks everyone. I've had the drone with my 2 1/2 inch TTI with H pipe and Dynomax on my 69GTX for years. After reading the posts I ordered a couple Jones 2 1/2 inch, 12" X 4" mufflers, Summit JEX-A4512B, to use as resonators. They're aluminized and a little smaller, just what I wanted. Will report back how they work. Jim




Thanks.
My car is a '69 roadrunner with the same set up as yours, and it drones. I never knew what to call the the sound until this thread.

Re: Exhaust Drone [Re: JohnH] #1245367
08/13/12 10:53 AM
08/13/12 10:53 AM
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S.W. Pennsylvania
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markrr Offline
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Quote:

What is the noise you all are calling drone? Ready to fire up my 440 with TTI's with mild muffles,, need to know what I might expect.... Thanks




In my case it's sort of a vibrating echo inside the car that pulses or resonates inside at around 2500 or so RPMs. If I speed up, slow down, shift, or do anything to change the RPMs the sound goes away.

Re: Exhaust Drone [Re: JohnH] #1245368
08/13/12 11:03 AM
08/13/12 11:03 AM
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bonefish Offline
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Quote:

What is the noise you all are calling drone? Ready to fire up my 440 with TTI's with mild muffles,, need to know what I might expect.... Thanks


DRONE is the noise you hear when your pipes aint loud enough.

Last edited by bonefish; 08/13/12 11:04 AM.
Re: Exhaust Drone [Re: JohnH] #1245369
08/14/12 08:32 AM
08/14/12 08:32 AM
Joined: Sep 2006
Posts: 277
Palmyra, NY
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63stabamatic Offline
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Quote:

What is the noise you all are calling drone? Ready to fire up my 440 with TTI's with mild muffles,, need to know what I might expect.... Thanks




John, the "drone" is a small point in the RPM range, (2200 or 45MPH on my GTX with 3.23 gears) where the exhaust note gets so loud it's almost painful. I've been avoiding that speed quickly which is possible but I see some of the guys fixed it by putting resontors at the end of the tailpipes like the Hemi cars. I will try this soon.

Jim

Re: Exhaust Drone [Re: 63stabamatic] #1245370
08/14/12 09:36 AM
08/14/12 09:36 AM
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Marysville, O-H-I-O
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yea, drone...hm....how do you describe it... how about, you'll know it when you hear it! it's a hollow echo/ringing type sound that can be deafening.



I cured mine with the 12" summit glasspack as well. I don't see how the resonator/glasspack is going to hurt performance. it's a straight through flow path with louvers cut into the inside flow tube. Plus, it's all the way at the end of the exhaust where the gasses have cooled down some anyway.


**Photobucket sucks**
Re: Exhaust Drone [Re: 70Cuda383] #1245371
08/14/12 10:24 AM
08/14/12 10:24 AM
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WV
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Thanks for the info,, I retired out of the Air Force and thought you were talking about a spy plane ... I hope I don't have that noise when I get this car on the road..

Re: Exhaust Drone [Re: mnguy55] #1245372
08/14/12 10:29 AM
08/14/12 10:29 AM
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Grand Haven, MI
patrick Offline
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Quote:

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.




try some dynomax VT's if you don't want to put a glasspack as a resonator in the tailpipe


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] #1245373
08/14/12 01:10 PM
08/14/12 01:10 PM
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Carson City, NV
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babarracuda Offline
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My 2 1/2 X 12 glass packs slowed my car 1.5 mph. Ive been told since then that glasspacks are the biggest HP robbers of any straight through muffler

Re: Exhaust Drone [Re: 63stabamatic] #1245374
08/22/12 04:18 PM
08/22/12 04:18 PM
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Palmyra, NY
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63stabamatic Offline
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Quote:

Thanks everyone. I've had the drone with my 2 1/2 inch TTI with H pipe and Dynomax on my 69GTX for years. After reading the posts I ordered a couple Jones 2 1/2 inch, 12" X 4" mufflers, Summit JEX-A4512B, to use as resonators. They're aluminized and a little smaller, just what I wanted. Will report back how they work.

Jim



I did exactly as described above and it works great! Drone is gone but still a healthy rumble at idle, much more enjoyable on the highway now. You can put the Jones mufflers in two ways, I put them in the maximum through exhaust mode, still plenty quiet.
Jim

7346084-DSCN1569.JPG (81 downloads)
Re: Exhaust Drone [Re: 63stabamatic] #1245375
08/22/12 10:15 PM
08/22/12 10:15 PM
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Near Reading PA USA
pinkduster Offline
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Quote:

DRONE is the noise you hear when your pipes aint loud enough.





Re: Exhaust Drone [Re: 63stabamatic] #1245376
08/25/12 01:20 AM
08/25/12 01:20 AM
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mnguy55 Offline
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I just added magnaflow 4" mufflers as resonators on my 70 Charger. I just got back from the test drive and it's a sucess. No more drone at 40 & 60 MPH. It still has a very deep sounding idle, a little deeper than I'd like but not bad. Driving is great. Sounds nice but you can listen to the radio with the windows up at 60 MPH. The only bad thing is I now hear a lot more noises that were covered up by the exhaust.

Re: Exhaust Drone [Re: AnRT4Me] #1245377
08/25/12 02:07 AM
08/25/12 02:07 AM
Joined: Jan 2003
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N.E. OHIO, USA
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Some more info and performance results at the end of the thread...........

https://board.moparts.org/ubbthreads/show...part=1&vc=1

Re: Exhaust Drone [Re: mnguy55] #1245378
08/25/12 08:15 PM
08/25/12 08:15 PM
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S.I. N.Y.
1MYTGTX Offline
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Quote:

Quote:

Quote:

Quote:

Quote:

Cured my Dynomax UltraFlo drone with a pair of Magnaflow bullets on the tailpipes...Hemi style




I'm interested in trying this. Can you tell me what magnaflow muffler you used? Did you weld the tip directly to the muffler or is there a short section of pipe connecting the two?




Please let us know. I'm interested also.




Thanks! Full write up here....

Magnaflow resonators





Thanks for the link. One more question. What tailpipes are you using? (Accurate, TTI, etc) I'm trying to figure out the longest resonator I can fit.




The tailpipes are 2.5" from Accurate LTD


1MYTGTX
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