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Re: Yoweeee! and a question

To: "Jim Muller" <jimmuller@pop.mail.rcn.net>, spitfires@autox.team.net
Subject: Re: Yoweeee! and a question
From: Douglas Braun & Nadia Papakonstantinou <doug@dougbraun.com>
Date: Sat, 08 Sep 2001 23:19:39 -0400
I have the exact same problem, but from about 2600 to 2900 rpm.
I have 4-1 headers and a stock pipe and muffler (rather old, though).

I have tried a lot of things:

1:  Make sure all the clamps and rubber hangers are OK.
2:  Underfelt under the main carpet and the trunk mat.
3:  Extra soundproofing on the firewall and tranny tunnel cover.

But the resonance is still there.  It's especially annoying on the
highway with the hardtop on, since 60-65 mph is right in the range
of resonance.

I can't figure out if the sound is coming from engine vibration,
the main pipe resonating, or the muffler resonating.  Maybe adding
a resonator in the middle of the main pipe would help, but
I've got enough other projects stacked up...

Doug Braun
'72 Spit

At 09:33 PM 9/8/01 , Jim Muller wrote:

>Now for my question.  The exhaust has a major resonance at about 2300-2500 
>rpm.  It is quite loud inside the car, loud enough to be a real irritant.  
>Is this normal?  (The muffler is new, BTW.  The previous motorcycle-style 
>"straight pipe" was embarrasing.  Nigel is red enough to attract far too 
>much attention already.)  Should I look for something amiss, or improveable, 
>in the exhaust hangers?  Or is it just something I'll have to live with?

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