FW: [s-cars] Stebro vs. Stromung exhaust

[Mark Strangways]

All that doesn't boad well for you system's justification does it now.
My only issues with tthe Stromung is that fact my tips seem to be rusty
after not even  months of use.
Poor stainless ?

Mark S
----- Original Message -----
From: <QSHIPQ at aol.com>
To: <mlped at qwest.net>; <jpostup at yahoo.com>
Cc: <FAmoroso at svbank.com>; <brian at atomicham.com>; <s-car-list at audifans.com>
Sent: Wednesday, May 28, 2003 7:43 AM
Subject: Re: FW: [s-cars] Stebro vs. Stromung exhaust


> --
> [ Picked text/plain from multipart/alternative ]
> 3 psi backpressure is about as low as you are going to see with any system
> with mufflers attached to it.  IME, you address 6psi and above to realize
gains.
>  IMEII, a set of high flow cats onto the stock audi S car pipes will all
but
> negate actual performance measure differences between mongo and stromung.
> The key is to measure backpressure just prior to the cat/cats.  My
measures
> indicated that to realize a performance gain over that juice can, two of
em is
> bettern one.
>
> Bottom Line:  Audi builds darn nice turbo exhausts from the factory.  You
can
> go "bigger", but really tough to equate that to "better"
>
> HTH and my .02 arbitraged thru the peso
>
> Scott Justusson
> In a message dated 5/27/2003 7:32:10 PM Central Daylight Time,
> mlped at qwest.net writes:
>
> Jeff, as Brian points out, it looks like the Don, Frank Amoroso, once put
> together some similar data.  Compare what you find in the article &its
> conjecture and conclusions with Frank's info below.
>
> I'd say that by comparison to the 94 WRX in Knowlton's article, it looks
to
> me like Audi already did a pretty good job with the UrS4/6's stock system.
> 3.25 psi of back pressure at 16 psi of manifold boost at ???? (rpms not
> given but I'd be guessing at least 6K) vs. the WRX's 8.7 psi of back
> pressure to make @ 10 - 11 psi of intake manifold boost at 7,000 rpm.
> Roughly half the back pressure, twice the boost in Stock system vs. stock.
> Using Frank's figures for a "slightly" modified stock system, i.e. "Euro
> Resonators", no measureable back pressure (? perhaps outside the
> "sophisticate" VDO test gauge range of sensitivity) at 16 psi of manifold
> pressure, and still less than 4 psi, i.e. a vibrating needle guess at 3.25
> psi back pressure, at up to 30 psi of boost, .... still all on the stock
> pipes.
>
> Now, if some one can (a) come up with some comparable data for the single
> turbo back 3" system; and (b) produce a simple, elegant formula, something
> like E=mc^2 or equivalent, to apply to how, if at all, this might affect
or
> determine PR's in Turbo maps &/or power potential realized or lost,... why
> what a wonderful world this would be.
>
> Mike "just reinventing the wheel" Pederson
>
> -----Original Message-----
> From: Brian Powell [mailto:brian at atomicham.com]
> Sent: Tuesday, May 27, 2003 1:27 PM
> To: mlped at qwest.net
> Subject: RE: [s-cars] Stebro vs. Stromung exhaust
>
>
> Mike,
>
> Frank has some of this pressure data up on the urs4 site (about
> half-way down):
>
> <http://urs4.com/technical/engine/UrS4_exhaust.html>
>
> He measured 3.251 psig of back-pressure at 16 psig of boost on a stock
> setup.
>
> Cheers,
> Brian
>
>
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