FYI FORD - MustangSteve's Ford Mustang Forum
The Internet's Most Knowledgeable Classic Mustang Information
IF YOU HAVE A QUESTION ABOUT CLASSIC FORD MUSTANGS, YOU HAVE COME TO THE RIGHT PLACE!
MustangSteve has over 30 years of Mustang experience, having owned 30 of them and restored several others. With the help of other Mustangers, this site is dedicated to helping anyone wanting to restore or modify their Mustang.... THERE ARE NO DUMB QUESTIONS!!!!!
Visit MustangSteve's web site to view some of my work and find details for:
FYIFORD Contributors' PICTURES - Power Brake Retrofit Kits for 65-66 Stangs - Classic Mustang FAQ's by MustangSteve - How to wire in a Duraspark Ignition - Mustang Ride Height Pictures and Descriptions - Steel Bushings to fit Granada Spindles to Mustang Tie Rods - Visit my EBAY store MustangSteve Performance - How to Install Granada Disc Brakes MustangSteve's Disc Brake Swap Page - FYIFORD Acronyms for guide to all the acronyms used on this page - FYIFORD Important information and upcoming events

You are not logged in. Would you like to login or register?

  • Index
  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » i've had enough

    • 1 of 1

       

    4/19/2015 8:55 PM  #1

    mark1965
    FYI Addict

    Offline

    Registered: 4/03/2013
    Posts: 172

    i've had enough

    exhaust drone !!   i have a 65 coupe with a 302 t5 hi pro manifold  h pipe  delta 50 flowmasters 2.5" tail pipes drone at around 2000 rpm and at cruise speeds . i want to remove this system but i don't know what i want  or need to stop the droning . any thoughts or advice would be great i don't want to throw good money after bad.
    thanks

     

    4/19/2015 9:08 PM  #2

    Triton
    FYI Addict

    Offline

    From: Rosenberg, Texas
    Registered: 6/24/2014
    Posts: 146

    Re: i've had enough

    I had the same thing, my exhaust was mounted from the hanger too ridge. I changed to a softer hanger and now I can have a conversation in the car!

    1965 Notchback, 8.8 rear end, T-5, Diy Front Struts, Shelby Drop, Bumpsteer Kit
     

    4/19/2015 9:12 PM  #3

    barnett468
    Banned

    Offline

    Registered: 9/15/2014
    Posts: 770

    Re: i've had enough

    .

    how loud do you want it outside?

    heres one option

    http://www.dynomax.com/mufflers/ultra-flo-stainless-steel-polished-mufflers
     

     

    4/19/2015 9:28 PM  #4

    6sally6
    Hyper FYIFORD ADDICT

    Offline

    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,899

    Re: i've had enough

    More than likely the "blowmasters" are the problem. Try my idea of replacing just ONE of the muffs with a Dynaflow or something and see if the drone stops...... butt steel have that healthy skreet rod sound.
    6sal6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    4/19/2015 9:28 PM  #5

    MS
    Forum Originator

    Offline

    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,347

    Re: i've had enough

    After four sets of droning mufflers I found the Walker Quiet Flow at Summit. They still have a healthy sound but no drone and no noise at highway cruise.
    Flowmaster 50's I used to have with the previous 351engine had zero drone and were quiet at cruise.
    Gibsons and some name brand mufflers with a spring loaded flapper valve about drove me crazy with drone on the trip to Tennessee from Tx.
    Apparently, every system is a little different.

    I did notice when I followed too close to Buzek even the Quiet flow started to drone, or maybe it was combined harmonics of his car and mine.  When I got farther away from his car, it went away.  I thought that was interesting but cannot explain it.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    4/20/2015 7:54 AM  #6

    Don
    Senior 24-7 FYI Addict

    Offline

    From: Coppell, Texas
    Registered: 4/02/2013
    Posts: 1,221

    Re: i've had enough

    I had bad drone on my fastback and tried a number of diff mufflers.  The sound energy was between 55 and 70 mph in 5th.   I put on these dynomax vt and there is minor "drone" is between 58 and 60 MPH only with windows up.  The little flap did rattle at idle but went away after about 500 miles.  My car is low powered 4barrel (275-300 hp).  Steve tried these mufflers and on his high hp 427,  the car had three bad rattles. They were very high and didn't go away until he swore alot and took the mufflers off. Then two of the muffler rattles went away.  There is still a bad rattle emiting from the front driver side seat.     

    http://www.dynomax.com/mufflers/dynomax-vt-mufflers

    Last edited by Don (4/20/2015 8:00 AM)

     

    4/20/2015 10:25 AM  #7

    Kar
    FYI Addict

    Offline

    From: Lexington, Kentucky
    Registered: 4/01/2013
    Posts: 238

    Re: i've had enough

    I have had very good luck with these and they are priced very nice, basically Flo-Pro makes a knock-off of several popular mufflers, this one is very cloes to the Magna-flow XL muffler at half the cost.

    http://www.flopro.com/original.html
     

     

    4/20/2015 12:53 PM  #8

    Pablo
    FYI Addict

    Offline

    From: Georgetown, Texas
    Registered: 4/12/2013
    Posts: 248

    Re: i've had enough

    MS, regarding your "Buzik Muzik" (drone), I had a friend years ago who also had a Harley.  If we rode side by side, at a constant speed, we would get a reverberating sounding drone.  One of us could drop back 15 or 20 feet and it would go away.  So, it just happens.
    Later.

     

    4/20/2015 12:57 PM  #9

    MS
    Forum Originator

    Offline

    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,347

    Re: i've had enough

    Pablo wrote:

    MS, regarding your "Buzik Muzik" (drone), I had a friend years ago who also had a Harley.  If we rode side by side, at a constant speed, we would get a reverberating sounding drone.  One of us could drop back 15 or 20 feet and it would go away.  So, it just happens.
    Later.

    Buzek Muzek...  LOL  Gotta tell Glen about this new pollution of his.  Interesting phenomenon, though.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    4/20/2015 5:17 PM  #10

    Tubo
    2008 BASH V Host

    Offline

    From: Ft. Walton Beach, Florida
    Registered: 4/01/2013
    Posts: 1,841

    Re: i've had enough

    Especially if you have an "H" or "X" pipe, the two sides of the exhaust system, just like two tines of a tuning fork, vibrate in the same frequency as the other. It has to do with the frequency of the exhaust pulses, and the sameness of the two exhaust legs. Solution [as Ford did with the foxbody 5.0's] is to use different size mufflers, other wise make the leggs differnt lengths, or install quarter wave diffusers of the proper length.

    Tubo

    If it ain't broke, I haven't modified it Yet
     

    4/20/2015 10:11 PM  #11

    Jeff in GA
    FYI Addict

    Offline

    From: San Luis Obispo, CA
    Registered: 4/01/2013
    Posts: 209

    Re: i've had enough

    I only have had only two 65's to compare, so the data is limited: coupe with 2.25" custom bent with h-pipe and super turbos and a fastback with 2.5" Magnaflow exhaust with X-pipe. To my ear (and sanity, haha), the former was better in all regards. I swapped out the Magnaflow mufflers on the fastback for Dynomax super turbos, and while improved, I still prefer the exhaust in the coupé. I'm not sure if this can be attributed to the exhaust diameter, h-pipe vs x-pipe, or coupe vs fastback. My guess is it is probably a bit of each. If I were to do it again with the fastback I'd probably go with the same diameter and configuration I had in the coupe, if for no other reason than a bit better clearance and slightly less cost. Good luck!

    1965 Mustang 2+2 EFI
     

    4/21/2015 7:48 AM  #12

    TimC
    I FYI 24-7

    Offline

    From: Wheaton, Illinois
    Registered: 4/01/2013
    Posts: 878

    Re: i've had enough

    My 65 has a bone stock 289 with stock 2.25 GT exhaust.  It does have flowmaster 40's on it.  There is no drone at any speed or rpm.  I have also seen some reference to the relationship of firing order and drone.  Those with the HO firing order seem to notice the drone more.

     

    4/21/2015 8:36 AM  #13

    Steve69
    Senior 24-7 FYI Addict

    Offline

    From: Madison Wisconsin
    Registered: 4/01/2013
    Posts: 2,769

    Re: i've had enough

    I have a slightly built 302 with the magnaflow's with no Drone.   They are louder than I like.   But after I switched from 4.56 Gear down to 3.25s that helped and then add a T5 made it really toned down.  
     

     

    4/21/2015 3:58 PM  #14

    MachTJ
    I FYI 24-7

    Offline

    From: Wisconsin
    Registered: 5/18/2014
    Posts: 348

    Re: i've had enough

    I am curious if the same muffler in a different position fore or aft would make a difference at which RPM the drone would occur, but I'm not well versed in harmonics.

     

     

    1 of 1

  • Index
  •  » FYI Ford, Classic Mustang Tech Discussion
  •  »  i've had enough

    • Board footera


    REMEMBER!!! When posting a question about your Mustang or other Ford on this forum, BE SURE to tell us what it is, what year, engine, etc so we have enough information to go on.