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Update 28 Jun 2003 from Mr. Royal
It's only taken about 3 years, but I'm building another one for
Bonnie's car and the part #'s for the thing are:
Dynomax Race Muffer (4 inch, 2 x 2.5" ID in/out for resonator)
24215
Dynomax Super Hemi Turbo (for rear muffler) 17748
Cheap money..mine's 3 years old and starting to peel away, but
has held
up very well thru out NE winters... can't beat the price.... about
$200
including parts and custom welding and all other 2.5" ID
pipe...
See Dynomax.com for a PDF and specs.
Royal aka 16RoT
The Run Down
From a 20v list posting sometime in February, 2001 re-posted
25 Sept 2001 by Peter Schulz (further down, you will see quoted
discussions with other list members):
From: Paul Royal
To: "Audi 20V"
Subject: [audi20v] RE: Custom exhaust tuning... help needed
Date: Thu, 22 Feb 2001 13:13:15 -0500
Hi Scott et al,
The system that I had built was based on discussions with lots of
folks that I trusted to be in the know both on flow characteristics and the
Audi I5. The person I listened to the most was none other than you
Scott...mostly because you were the last person I talked to, one of the most
knowledgeable folks I know in these circles, and because the info you gave
me was not a grand departure from my own thinking on this and other
knowledgeable folks I talked to.
The exhaust that resulted can be seen at:
http://www.mchang.org/audi/tech/royal_rogue/
I am very, very happy with its performance. I have not lost any
noticeable low end, and who can say for sure without a dyno, but I can get
to speeds heretofore unobtainable on the track even at 260,000 miles. It's
relatively quiet at highway speeds and has a nice growl when you're "on it."
Again, the exhaust was custom welded using heavy duty 2.5 inch pipe,
a Walker Dynomax Race Muffler for the resonator (2.5" I/O, 4" center), and a
Hemi Super Turbo Dynomax with 2.5" I/O measuring about 20"x10"x5" (someday
I'll get the damn part number). It was completed for about $225 with parts
and labor.
I challenge someone to make something better...not to be cocky...but
in the name of science ;-).
People on this list who have seen and heard my system are Chris
Miller, Peter Schulz, Dan Simoes, and a few other assorted folks.
Have fun... I look forward to hearing about what other folks are
doing.
12RoT
> -----Original Message-----
> From: QSHIPQ
> Sent: Thursday, February 22, 2001 12:06 PM
> To: Audi 20V
> Subject: [audi20v] RE: Custom exhaust tuning... help needed
>
> Common problem, turbo or N/A I5 Audis. The mid muffler is what tunes out
> the
> resonance at highway speeds, however it also sucks midrange and highend
> power. A couple of things you can do:
> Put the cat back in, it also muffles sound. High flow cats are best for
> this, I've found good luck using 3in cats on 2.5in systems (this brings
> the
> "urgent" tone down). This also works in the center muffler application.
> The
> best muffler for the center in terms of height and clearance is the 12in
> Borla XR1. Again, going with the 3in version of this will create a lower
> tone, and really address the midrange drone, without sacrificing power.
> As
> far as the rear muffler, I use the Borla (expensive) or the walker dynomax
>
> (best b4b) ultraflow.
> As for what you have stock to work with, I haven't had a lot of luck using
>
> any "glasspack" type mufflers in the audi I5, they don't really do much in
>
> terms of quieting this unbalanced motor pulses.
> As a rule, deleting the center muffler gives you great gains in midrange
> and
> high end flow, but *always* at the expense of the sound right where you
> drive
> the most often (a subchapter of Murphy's law applied to audis).
>
> HTH
>
> Scott Justusson
> QSHIPQ Performance Tuning
> Chicago
> '87 5ktqwRS2 10vt w/ 3in turbo back exh, 3in high flow cat, 3inxdual2.5
> borla
> '87 4Runner turbo w/3in turbo back exh, 3in high flow cat, hooker turbo
> 3in
> '84 Urq - formerly with 3in turbo back scorpion (dual muffler) w// 3in
> high
> flow cat
> '83 Urq - stock rear and cat, flowmaster 2.5in center muffler
> '85 FJ1387 - SS headers, supertrapp exhaust w 8 plates ;)
>
> spokes at mail.the-wire.com writes:
> Car: 1989 audi 90 quattro
>
> Earlier this year I decided to do some custom tuning of the exhast system
> on
> my
> car. (look for a webpage coming up soon...i'll drop a URL to the list,
> photos
> will be taken on friday)
>
> I replaced the stock rear muffler with a 12 inch resonator (2.5 inner
> dia).
> The
> result was a pretty darn sporty sound! It's loud, but not super-rice-boy
> loud.
> It does, however, have a very annoying drone right at 3000rpm. 3000rpm is
> right
> where I end up sitting for normal driving.
>
> The result of the modification was a large increase in throttle response,
> the
> car now pulls all the way to the redline...it used to just die at 4500-
> 5000rpm...continually adding revs but not increasing the power much at
> all.
>
> I'd like to 'tune' the sound, but without an exhaust lab that isn't the
> easiest
> thing to do! All I want to do is get rid of the drone at three thousand
> rpm.
> I
> don't mind going a little louder, I'd be happy just to 'move' the drone to
> a
> higher or lower rpm range too.
>
> I haven't touched the centre muffler yet, it's an aftermarket stock
> replacement.
>
> I have easy access to:
> 12", and 15" resonators
> 15" long universal mufflers round or oval shape
> I can have anything custom made with an 8-14wk turn around (so, if I
> wanted a
> 6" resonator...)
>
>
> Any ideas as to what I should start playing with? Now that my job
> requires
> lots of highway driving, I REALLY need to do something about that drone!
>
> -Dave
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