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Re: Exhaust Drone [Re: AnRT4Me] #1245358 08/12/12 11:12 AM 08/12/12 11:12 AM
Joined: Jan 2003 Posts: 1,643 A certified culture free zone. 74RALLYE top fuel
74RALLYE top fuel Joined: Jan 2003 Posts: 1,643 A certified culture free zone.	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
Joined: Jan 2003 Posts: 3,967 S.I. N.Y. 1MYTGTX master
1MYTGTX master Joined: Jan 2003 Posts: 3,967 S.I. N.Y.	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
Joined: Jul 2005 Posts: 141 MN M mnguy55 member
mnguy55 member M Joined: Jul 2005 Posts: 141 MN	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
Joined: Apr 2004 Posts: 965 S.W. Pennsylvania M markrr super stock
markrr super stock M Joined: Apr 2004 Posts: 965 S.W. Pennsylvania	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
Joined: Jan 2003 Posts: 3,967 S.I. N.Y. 1MYTGTX master
1MYTGTX master Joined: Jan 2003 Posts: 3,967 S.I. N.Y.	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
Joined: Jul 2005 Posts: 141 MN M mnguy55 member
mnguy55 member M Joined: Jul 2005 Posts: 141 MN	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
Joined: Sep 2006 Posts: 277 Palmyra, NY 6 63stabamatic enthusiast
63stabamatic enthusiast 6 Joined: Sep 2006 Posts: 277 Palmyra, NY	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
Joined: Nov 2003 Posts: 549 WV J JohnH mopar
JohnH mopar J Joined: Nov 2003 Posts: 549 WV	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
Joined: Apr 2004 Posts: 965 S.W. Pennsylvania M markrr super stock
markrr super stock M Joined: Apr 2004 Posts: 965 S.W. Pennsylvania	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
Joined: Apr 2004 Posts: 965 S.W. Pennsylvania M markrr super stock
markrr super stock M Joined: Apr 2004 Posts: 965 S.W. Pennsylvania	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
Joined: Nov 2004 Posts: 7,274 s.w.fl B bonefish master
bonefish master B Joined: Nov 2004 Posts: 7,274 s.w.fl	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 6 63stabamatic enthusiast
63stabamatic enthusiast 6 Joined: Sep 2006 Posts: 277 Palmyra, NY	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
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	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
Joined: Nov 2003 Posts: 549 WV J JohnH mopar
JohnH mopar J Joined: Nov 2003 Posts: 549 WV	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
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	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
Joined: Sep 2003 Posts: 1,465 Carson City, NV B babarracuda pro stock
babarracuda pro stock B Joined: Sep 2003 Posts: 1,465 Carson City, NV	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
Joined: Sep 2006 Posts: 277 Palmyra, NY 6 63stabamatic enthusiast
63stabamatic enthusiast 6 Joined: Sep 2006 Posts: 277 Palmyra, NY	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
Joined: Nov 2004 Posts: 6,653 Near Reading PA USA pinkduster master
pinkduster master Joined: Nov 2004 Posts: 6,653 Near Reading PA USA	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
Joined: Jul 2005 Posts: 141 MN M mnguy55 member
mnguy55 member M Joined: Jul 2005 Posts: 141 MN	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 Posts: 21,495 N.E. OHIO, USA A12 Too Many Posts
A12 Too Many Posts Joined: Jan 2003 Posts: 21,495 N.E. OHIO, USA	Some more info and performance results at the end of the thread........... https://board.moparts.org/ubbthreads/show...part=1&vc=1

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