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#1 |
Shake and Bake!
![]() Join Date: Feb 2010
Location: Central Coast, CA
Posts: 609
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Ideas On How To Get Rid Of Exhaust Drone?
Hey guys,
So I started my day by re-timing my truck and let me tell you, she is running sooo much better!! But anyways, I have been trying to track down a loud drone/whine sound when on the freeway for a while now, it sounded like a bad rear end, so I checked it and it seems fine. It comes on at about 60-65 MPH which is about 2300-2500 RPM. At 55 its not there, at 70 its not there, let off the go pedal its not there etc. I am pretty much positive it is exhaust drone. I have long tube headers going into 40 series flows with turn outs in front of the rear axle. I am wondering if anyone has had any similar problems, or has any ideas on how to get rid of this drone, it makes your head hurt after 10 minutes! ![]() The PO had the exhaust done by a shop and where the turnouts are, they drilled a bolt hole in the frame, welded a bracket to the pipe, and thru bolted the bracket to the frame with big rubber bushings on both sides instead of a hanger type mount. Would a cross pipe (H pipe) help you think? Ok sorry for the long post, as always I appreciate your guys help! ![]()
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"All tyranny needs to gain a foothold is for people of good conscience to remain silent." Thomas Jefferson "You are remembered for the rules you break." General Douglas MacArthur "Support Our Troops And The NRA" |
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#2 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Ideas On How To Get Rid Of Exhaust Drone?
you could move the mufflers further back in the system to change the harmonics
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#3 | |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: Ideas On How To Get Rid Of Exhaust Drone?
Quote:
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I'm on the Instagram- @Gearhead_Kevin |
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#4 |
Registered User
Join Date: Mar 2010
Location: pinetop az
Posts: 55
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Re: Ideas On How To Get Rid Of Exhaust Drone?
i had a similar issue on my truck. my mufflers were right under the cab and the tailpipes were just before the rear end. i put some 45 degree tailpipes so it would exit in front the the rear wheels and i have not had a problem since
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#5 | |
Shake and Bake!
![]() Join Date: Feb 2010
Location: Central Coast, CA
Posts: 609
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Re: Ideas On How To Get Rid Of Exhaust Drone?
Quote:
Yeah, they turn out the sides right in front of the rear wheels already, thanks for the recommendation though.
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"All tyranny needs to gain a foothold is for people of good conscience to remain silent." Thomas Jefferson "You are remembered for the rules you break." General Douglas MacArthur "Support Our Troops And The NRA" |
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#6 | |
Shake and Bake!
![]() Join Date: Feb 2010
Location: Central Coast, CA
Posts: 609
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Re: Ideas On How To Get Rid Of Exhaust Drone?
Quote:
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"All tyranny needs to gain a foothold is for people of good conscience to remain silent." Thomas Jefferson "You are remembered for the rules you break." General Douglas MacArthur "Support Our Troops And The NRA" |
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#7 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: Ideas On How To Get Rid Of Exhaust Drone?
An "H-Pipe" will always help, if nothing else but to add low end torque. However, having just dealt with my newer Pontiac G8 6.0 engine, customisizing the exhaust and the drone inside it, I would recommend an "X-Pipe" instead. The drone went away and the torque numbers were more than what an H-Pipe would even think about.
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Frank |
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#8 |
Registered User
Join Date: Jan 2008
Location: Tejas
Posts: 691
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Re: Ideas On How To Get Rid Of Exhaust Drone?
H-pipe, and magnaflows
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'72 cheyenne super step, '05 long bed gmc |
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#9 |
Registered User
![]() Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,510
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Re: Ideas On How To Get Rid Of Exhaust Drone?
I had a set of burned out glass packs on duals that exited in front of the rear tires and had that drone until I went with turbos and new pipes that exit behind the tire like they are supposed to.
Different and more flexible hangers might help some but running tailpipes back to where they should exit would be the biggest and best change. You won't get to here it rumble back off the Johnson barriers like you do now but you won't get the headaches either. |
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#10 |
2WD Jimmy
![]() Join Date: Mar 2005
Location: Davis County, Utah
Posts: 2,564
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Re: Ideas On How To Get Rid Of Exhaust Drone?
Thats why they use flexible hangers. If that system touchs the frame anywhere, itll make a difference. I am not saying 'thats it', but you should use the rubber hangers.
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#11 |
Never Ending Projects
Join Date: Jul 2006
Location: San Diego, CA
Posts: 3,836
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Re: Ideas On How To Get Rid Of Exhaust Drone?
When I saw the title of this thread, I thought to myself, he's got Flowmaster mufflers. I had a similar problem on my last '68 using FM and I even had the exhaust ran out the back. It used to give me and my wife a headache. Myself and many of my friends who have used FM mufflers have always found at some RPM/Speed a drone. Go to about any other brand of muffler and the problem goes away.
I for one will never use Flowmasters again. My guess is to change your mufflers or live with it. My .02 worth.
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. 1965 C10 Panel, ![]() 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often... |
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#12 |
knuckle buster..
![]() Join Date: Oct 2007
Location: Frisco
Posts: 613
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Re: Ideas On How To Get Rid Of Exhaust Drone?
You could always do some sound insulation work..... this will change the comfort level inside the truck and allow you to listen to music, or have a conversation without having to fight road noise!
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#13 |
C-10 Club Member
Join Date: Mar 2010
Location: Corona,CA
Posts: 1,001
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Re: Ideas On How To Get Rid Of Exhaust Drone?
Some good sugestions....
What mufflers are you running what motor? I would try to get the mufflers out from under the cab. X/H pipe will help and the type of muffler plays a big role. A lot of people love that flowmaster sound but they cost you hp and can be anoyingly loud. I run nothing but magnaflow |
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#14 | |
knuckle buster..
![]() Join Date: Oct 2007
Location: Frisco
Posts: 613
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Re: Ideas On How To Get Rid Of Exhaust Drone?
Quote:
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_______________________________________________________________________________ Eric THIS SITE ROCKS!!! ![]() Check out my suburban on 20's with fresh paint! Click here to support the site Check out the Member Photo Gallery here StreetCruizin FAQ thread Site vendors list (scroll down to vendors in red) ![]() ![]() |
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#15 | |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: Ideas On How To Get Rid Of Exhaust Drone?
Quote:
Make sure that 1) you are running your pipes out from under the truck and 2) you have a good flow path and not a lot of restrictions under the truck. You want that sound at the end of the exhaust pipe, not under the truck.
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Frank |
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#16 |
Old Skool Club
![]() Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: Ideas On How To Get Rid Of Exhaust Drone?
Mine has a drone to it, but I kinda like it. The wife doesn't, so I get to drive it by myself. Radio? Don't bother. Have Flowmaster 40's underneath the floor with the exit pipes in front of each rear wheel opening.
My '96 GMC with a 4.3 has a Flowmaster Wannabe on it, and it also has a droning sound. The GMC has more insulation and running the A/C or driving with the windows closed takes care of some of it, but the stock muffler had a harmonic resonance, too. My '81 El Camino had a pair of baby turbo mufflers and tailpipes out the back. It had a droning sound that I couldn't take, especially on the highway. So, I replaced the exhaust system with new pipes and a muffler from a Buick Regal Grand National. Nice, throaty sound without any annoying resonance. Much nicer to drive. But my '69 was built to listen to and it will be when it is done, whenever that is.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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#17 |
Registered User
Join Date: Feb 2009
Location: minonk illinois
Posts: 224
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Re: Ideas On How To Get Rid Of Exhaust Drone?
magnaflows have no drone for me I loved flowmaster until I got these.
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#18 |
Registered User
Join Date: Mar 2005
Location: tampa florida
Posts: 776
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Re: Ideas On How To Get Rid Of Exhaust Drone?
I have super 40's back behind the cab with an H pipe and I still get a drone. I like it!!!!!!!!! If it bugs me I can hit the gvod and the rpm changes and the drone goes away. Guess its just a fm thing. I'd rather listen to the engine than the radio.
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#19 | |
Shake and Bake!
![]() Join Date: Feb 2010
Location: Central Coast, CA
Posts: 609
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Re: Ideas On How To Get Rid Of Exhaust Drone?
Quote:
Trust me, there is nothing enjoyable about this drone, and I like loud, I am in Cali so when I hear "smog exempt", I think how loud can I make this thing to piss off the eco hippies ![]() This is more the sound of a police car siren, but in the cab with you, it makes your head hurt! The mufflers are under the rear of the cab, and the direct mount rear hangers are making it worse. I have an appointment at the end of the week for my buddy at the welding shop to make me some new hangers and install an H pipe, I sure hope it fixes it!
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"All tyranny needs to gain a foothold is for people of good conscience to remain silent." Thomas Jefferson "You are remembered for the rules you break." General Douglas MacArthur "Support Our Troops And The NRA" Last edited by Leviticus; 04-07-2010 at 01:58 AM. |
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