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Author Topic:   Exhaust drone becoming annoying
stang106
Gearhead

Posts: 780
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 10-29-2002 11:51 AM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
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

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'70 ragtop Stang
351W - 13.70 @104.

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SteveLaRiviere
Administrator

Posts: 42139
From: Saco, Maine
Registered: May 99

posted 10-29-2002 12:19 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
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!

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'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

posted 10-29-2002 12:43 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
They make very small reasonators that can be put on the end of your tail pipes to change the exhaust pitch.

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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
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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!"
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Hell_Fish
Gearhead

Posts: 860
From: Austin, TX.
Registered: May 2002

posted 10-29-2002 01:24 PM     Click Here to See the Profile for Hell_Fish   Click Here to Email Hell_Fish     Edit/Delete Message   Reply w/Quote
Wouldn't a muffler change help too?

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Gearhead
Gearhead

Posts: 2171
From: Brisbane, Australia
Registered: Mar 2000

posted 10-29-2002 01:58 PM     Click Here to See the Profile for Gearhead   Click Here to Email Gearhead     Edit/Delete Message   Reply w/Quote
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.

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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

posted 10-29-2002 02:07 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
I can say that with turn down tail pipes, my cars do not drone a bit using Walkers.

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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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stang106
Gearhead

Posts: 780
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 10-29-2002 06:16 PM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
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.

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'70 ragtop Stang
351W - 13.70 @104.

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bluestreek
Gearhead

Posts: 1720
From: Athens,GA
Registered: Jul 2001

posted 10-29-2002 07:30 PM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote

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

posted 10-29-2002 09:40 PM     Click Here to See the Profile for 69stanger     Edit/Delete Message   Reply w/Quote
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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