[s-cars] Exhausts

[Taka Mizutani]

The OE system is not 2.5" per tube, IIRC.

Also, with a single vs. dual setup, you also have to take into account
losses from wall friction or whatever it's called.

That said, I don't think the Stromung flows any better than the OE system-
you need to go to a 3.5" setup to really see big gains, but you will at the
expense of a lot more sound.

Taka


On Mon, Dec 7, 2009 at 5:25 PM, Robert Myers <bob at chips-ur-s.com> wrote:

> *This message was transferred with a trial version of CommuniGate(r) Pro*
>
> Do the cross sectional area calculation for one 3 inch diameter tube
> vs.  two two and a half inch tubes.  The dual system wins out.
> 9.82 vs. 7.06 square inches.
>
>
>
> Bob
>
>
> At 05:16 PM 12/7/2009, pmische wrote:
> >*This message was transferred with a trial version of CommuniGate(r) Pro*
> >Has anyone actually done a Stromuuuung v. OEM back-to-back on the dyno?
>  I'd
> >love to see the data.
> >
> >I will say the Stromung does seem to deliver better throttle response
> (hard
> >to measure that), and there's that unbeatable, unquestionable sonorous
> >mellifluousity...
> >
> >PJM
> >
> >-----Original Message-----
> >From: s-car-list-bounces at audifans.com
> >[mailto:s-car-list-bounces at audifans.com] On Behalf Of djdawson2 at aol.com
> >Sent: Monday, December 07, 2009 4:58 PM
> >To: dlandaeta at gmail.com; alexander_witham at yahoo.com
> >Cc: s-car-list at audifans.com
> >Subject: Re: [s-cars] Exhausts
> >
> >
> >
> >"...and allows for 'real' tuning that requires moving a lot of exhaust
> >- of course, it's nice to move a lot of air on the intake side as well!"
> >
> >
> >
> >Just to be clear... an exhaust like the Stromung, while they do sound very
> >nice, is certainly not required to do "real" tuning or to extract big
> >horsepower from the I-5 20v engine.  Dyno tests have proven on more than a
> >few occasions that the OE exhaust is not limiting power output, and
> >installing an aftermarket unit does not improve power output.  That is
> fact.
> >
> >What you are buying is a cool sound, less weight, and fewer parts.
> >
> >Dave
> >
> >
> >
> >
> >
> >-----Original Message-----
> >From: Douglas Landaeta <dlandaeta at gmail.com>
> >To: alexander witham <alexander_witham at yahoo.com>
> >Cc: s-car-list at audifans.com
> >Sent: Mon, Dec 7, 2009 1:59 pm
> >Subject: Re: [s-cars] Exhausts
> >
> >
> >Alexander,
> >
> >Stromung. Nice quiet low thudding on idle in a confined space, (rattles
> old
> >house windows from the driveway) but cruises very quietly, until full
> >throttle boosts just open up and create a low throaty roar that is
> >uncomparable for an Audi - almost P-car like. The tuning of the sound is
> >excellent and allows for 'real' tuning that requires moving a lot of
> exhaust
> >- of course, it's nice to move a lot of air on the intake side as well! Do
> >the bigger turbo as a package and your 'tuner' can customize chips to pull
> >all the performance out of the package. 'll let others describe ther
> >versions - Mine's from 2004 or '05, generation IV, I think.
> >Yes, the lower attaching bracket is broken at the weld joint, but it gives
> >me no trouble and I hear that the latest version with a flex pipe has
> fixed
> >that issue.
> >
> >Doug
> >94 'S4 rolling over 25k miles on the Stromung
> >
> >On Mon, Dec 7, 2009 at 3:29 PM, alexander witham <
> alexander_witham at yahoo.com
> > > wrote:
> >
> > > Hi all,
> > >
> > > So, I just picked up another UrS6 and I love it. I'd been toying with
> the
> > > notion of doing exhaust on my previous 2 UrS cars and looked into it
> >pretty
> > > seriously before backing off due to financial constraints.
> > >
> > > Well, the urge is back and I thought I would pick your brains as to
> what
> > > the best course of action is. In case it's relevant, the car is
> currently
> > > equipped with K&N, MTM Stage +, and RS2 exhaust manifold.
> > >
> > > I'm looking for a pretty aggressive sound that's really going to bring
> out
> > > the I5's bark. But I don't want that highway droning that's so common
> with
> > > aftermarket systems.
> > >
> > > So what do you folks recommend?
> > >
> > > Thanks,
> > >
> > > Alex
> > >
> > >
> > >
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