Re: Exhaust Drone
[Re: RapidRobert]
#1245341
06/04/12 05:04 PM
06/04/12 05:04 PM
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Joined: Jan 2003
Posts: 16,122 Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,122
Grand Haven, MI
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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)
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Re: Exhaust Drone
[Re: patrick]
#1245342
06/04/12 05:13 PM
06/04/12 05:13 PM
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Joined: Aug 2003
Posts: 12,291 Kent, Wa
340SHORTY
Truck Nut
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Truck Nut
Joined: Aug 2003
Posts: 12,291
Kent, Wa
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If I said it once Ive said it a hundred times
HOOKER AERO CHAMBERS
I am truckless..
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Re: Exhaust Drone
[Re: AnRT4Me]
#1245344
06/04/12 07:20 PM
06/04/12 07:20 PM
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Joined: Sep 2005
Posts: 6,516 Santa Cruz, California
Lefty
master
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master
Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
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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=
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Re: Exhaust Drone
[Re: 340SHORTY]
#1245345
06/04/12 07:26 PM
06/04/12 07:26 PM
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Joined: Jan 2012
Posts: 1,650 Harm City Md.
Dan Halen
top fuel
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top fuel
Joined: Jan 2012
Posts: 1,650
Harm City Md.
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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!!
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Re: Exhaust Drone
[Re: Lefty]
#1245346
06/04/12 07:29 PM
06/04/12 07:29 PM
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Joined: Mar 2005
Posts: 862 Iowa State fan
kilroy
super stock
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super stock
Joined: Mar 2005
Posts: 862
Iowa State fan
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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....
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Re: Exhaust Drone
[Re: AnRT4Me]
#1245354
08/12/12 12:21 AM
08/12/12 12:21 AM
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Joined: Jul 2005
Posts: 141 MN
mnguy55
member
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member
Joined: Jul 2005
Posts: 141
MN
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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.
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Re: Exhaust Drone
[Re: mnguy55]
#1245355
08/12/12 12:27 AM
08/12/12 12:27 AM
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Joined: Mar 2003
Posts: 4,848 Memphis
HemiRick
master
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master
Joined: Mar 2003
Posts: 4,848
Memphis
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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
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Re: Exhaust Drone
[Re: 74RALLYE]
#1245359
08/12/12 01:55 PM
08/12/12 01:55 PM
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Joined: Jan 2003
Posts: 3,967 S.I. N.Y.
1MYTGTX
master
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master
Joined: Jan 2003
Posts: 3,967
S.I. N.Y.
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Cured my Dynomax UltraFlo drone with a pair of Magnaflow bullets on the tailpipes...Hemi style
1MYTGTX
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Re: Exhaust Drone
[Re: 1MYTGTX]
#1245360
08/12/12 03:23 PM
08/12/12 03:23 PM
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Joined: Jul 2005
Posts: 141 MN
mnguy55
member
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member
Joined: Jul 2005
Posts: 141
MN
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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?
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Re: Exhaust Drone
[Re: mnguy55]
#1245361
08/12/12 04:29 PM
08/12/12 04:29 PM
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Joined: Apr 2004
Posts: 965 S.W. Pennsylvania
markrr
super stock
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super stock
Joined: Apr 2004
Posts: 965
S.W. Pennsylvania
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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.
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Re: Exhaust Drone
[Re: 1MYTGTX]
#1245363
08/12/12 11:24 PM
08/12/12 11:24 PM
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Joined: Jul 2005
Posts: 141 MN
mnguy55
member
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member
Joined: Jul 2005
Posts: 141
MN
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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.
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Re: Exhaust Drone
[Re: 63stabamatic]
#1245366
08/13/12 10:49 AM
08/13/12 10:49 AM
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Joined: Apr 2004
Posts: 965 S.W. Pennsylvania
markrr
super stock
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super stock
Joined: Apr 2004
Posts: 965
S.W. Pennsylvania
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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.
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Re: Exhaust Drone
[Re: JohnH]
#1245367
08/13/12 10:53 AM
08/13/12 10:53 AM
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Joined: Apr 2004
Posts: 965 S.W. Pennsylvania
markrr
super stock
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super stock
Joined: Apr 2004
Posts: 965
S.W. Pennsylvania
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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.
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Re: Exhaust Drone
[Re: JohnH]
#1245369
08/14/12 08:32 AM
08/14/12 08:32 AM
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Joined: Sep 2006
Posts: 277 Palmyra, NY
63stabamatic
enthusiast
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enthusiast
Joined: Sep 2006
Posts: 277
Palmyra, NY
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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
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Re: Exhaust Drone
[Re: 63stabamatic]
#1245370
08/14/12 09:36 AM
08/14/12 09:36 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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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**
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Re: Exhaust Drone
[Re: 63stabamatic]
#1245374
08/22/12 04:18 PM
08/22/12 04:18 PM
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Joined: Sep 2006
Posts: 277 Palmyra, NY
63stabamatic
enthusiast
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enthusiast
Joined: Sep 2006
Posts: 277
Palmyra, NY
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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
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