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Author
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Topic: Exhaust drone becoming annoying
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stang106
Gearhead Posts: 780
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 10-29-2002 11:51 AM
   
My 351W has cast exhaust manifolds, 2-1/2 pipes front to back, mandrel bent over the rear, X-pipe, and Walker Turbos. The problem is a very annoying drone from idle to 2500 RPM. The car is mostly a family cruiser, where putting around town lots under 2500 RPM. I see the strip once a year(13.70), (more if the other airports on Vancouver Island oper to 1/4 mile racing) I would like suggestions on where to go from here to resolve this drone problem?
Thanks,
Dave------------------
'70 ragtop Stang
351W - 13.70 @104.
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SteveLaRiviere
Administrator Posts: 42139
From: Saco, Maine
Registered: May 99
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posted 10-29-2002 12:19 PM
A friend of mine got rid of a drone on his brand-x recently by just swapping his exhaust tips for some 3" Borla tips. {they were 2 1/2 before, I believe}YMMV, of course, but it seems to be a matter not unlike tuning a horn!  ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 [This message has been edited by SteveLaRiviere (edited 10-29-2002).]
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Moneymaker
Administrator Posts: 25052
From: Lyons, IL, USA
Registered: May 99
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posted 10-29-2002 12:43 PM
They make very small reasonators that can be put on the end of your tail pipes to change the exhaust pitch.  ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
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Hell_Fish
Gearhead Posts: 860
From: Austin, TX.
Registered: May 2002
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posted 10-29-2002 01:24 PM
Wouldn't a muffler change help too?
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Gearhead
Gearhead Posts: 2171
From: Brisbane, Australia
Registered: Mar 2000
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posted 10-29-2002 01:58 PM
I've used both Dynomax SuperTurbos and Flowmaster 2-chambers and both have droning issues. Surprisingly, I found that the Dynomax actually droned MORE than the Flowmaters. 2000-2500 rpm would give me a headache with the Superturbos in my 89 GT, and while the Flowmasters are louder, the "drone zone" is narrower (1900-2200 rpm), and doesn't seem to be a resonant (is that a word?  ) as the Dynos. Strange.I have heard that by going with one 2-chamber flowmaster and one 3-chamber version on the other side that drone is reduced considerably. I haven't found anyone locally with a a 3-chamber system to trade a muffler with to test this theory myself, however. ------------------
Cheers,
Ian
M&M Member #395
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'79 Mustang Indy 500 Pace Car
Ian's Pace Car Website
Vancouver Island Mustang Association Website
Indy Pace Car Registry of Mustangs Official Website "A friend will bail you out of jail after you do something stupid... a real friend will be sitting beside you saying 'That was SO COOL!!'".
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Moneymaker
Administrator Posts: 25052
From: Lyons, IL, USA
Registered: May 99
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posted 10-29-2002 02:07 PM
I can say that with turn down tail pipes, my cars do not drone a bit using Walkers. ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
IP: Logged |
stang106
Gearhead Posts: 780
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 10-29-2002 06:16 PM
I have turndowns, but the angle is shallow as I did not want a restriction at the end of the exhaust system. I was kind of thinking my X-Pipe was the culprit here, maybe a change to a crossover? I first ran the same motor with the old 2" exhaust with no drone (or power) so I am hoping to do something about it.------------------
'70 ragtop Stang
351W - 13.70 @104.
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bluestreek
Gearhead Posts: 1720
From: Athens,GA
Registered: Jul 2001
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posted 10-29-2002 07:30 PM
I remember going to the muffler shop the first time to have dual exhaust installed. I made them install 3 different sets of turbo mufflers before I found one that I liked. The short length of the mufflers is what seemed to make the difference. They wound up being the largest set that would squeeze in. I never knew what brand though, they were just off the shelf.  How much difference did the 2 1/2" pipes make compared to the 2" ?
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69stanger
Journeyman Posts: 77
From: Northridge, CA
Registered: Aug 2002
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posted 10-29-2002 09:40 PM
maybe you could upgrade from your cast-iron exhaust manifolds to long tube headers, they should improve your HP as well as reducing the drone a lot.
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