[s-cars] Exhaust dyno results...

[Gabriel Caldwell]

I guess the message is shine up your tips and rock on.

http://www.gabrielcaldwell.com/pix/Audi/S4/exhaust.jpg


Gabriel Caldwell


-----Original Message-----
From: Djdawson2 at aol.com [mailto:Djdawson2 at aol.com] 
Sent: September 14, 2004 2:01 PM
To: james.murray at ericsson.com; nick at newtsplace.com;
s-car-list at audifans.com
Subject: Re: [s-cars] Exhaust dyno results...

In a message dated 9/14/2004 2:11:07 PM Mountain Daylight Time, 
james.murray at ericsson.com writes:

> 
> So basically your saying....
> 
> No appreciable difference between having no exhaust, the stock
exhaust, or a 
> sport exhaust since they all flow more than the ability of the engine
can 
> output.

That is what I'm saying, based on actual dyno testing.  Keep in mind,
the car 
has never been tested with a Stromung... although I find it difficult to

fathom any gain over wide open.

 Hmmm... this is all very odd... for as long as I've owned this S-car
all I 
ever read 
> was how opening up the exhaust will flow better and gain power as well
as 
> earlier onset of boost... didn't Corkey's book say this too? (not that
I read 
> it, but I'm sure it's been posted before...), I thought those cats
factored 
> at least some restriction... 


Then you may want to read the book.  A graph can be found within the
book 
that backs up this issue.  Based on his graph, a dual 2" exhaust will
not limit 
engines in our power output range... and a single 3" will provide only a

marginal improvement... if you find yourself making over 600hp, and just
can't seem 
to wring any more power out of it.

> 
> Regardless if there is a gain or not, there is certainly a perception
of 
> gain, all that talk of butt dyno... that alone is worth it ;-)

After reading my posts, you can certainly appreciate the fact that I'm
not a 
fan of the butt dyno...

, and for those that appreciate the sound of their engine a Strumong 
certainly 
> makes a sweet sound, but I guess for those that want to remain stealth
it's 
> certainly good news.

Without question, I love the sounds that come from the guy's cars that
are so 
equipped.  I'd never argue that the stock exhaust is giving any clues as
to 
what is happening under the hood  ;-)

> 
> I still find this hard to swallow... 
> 

Well... me too.  I have long been sceptical about any significant gains 
resulting from going to a single 3 vs. a dual 2.  But I would never have
guessed 
the actual test results on a car run "uncorked."  However, I can't argue
with 
them either.  Same car, same dyno, same day...  Witnesses to boot.  And
that's 
what happened.
Take care,
Dave
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