[s-cars] Stromung Exhaust

[Ned Ritchie]

At higher engine rpm there is no drone. 
 
What is irritating is found only at engine RPMs that occur in high gear
between 50 and 55 mph.  This particularly occurs with 3" and larger tubes
where there appears to be some reverberation or reflected waves that
restricts flow.  Kind of like reflected waves in a coax cable.  A longer
cable or exhaust could tune where the drone occurs or even eliminate the RPM
sensitive restriction.  Once you get over that restrictive drone the power
just frees up.

It was for this reason I was asking about that particular speed.

The "BN Pipes" twin tube exhaust from Germany was way less restrictive than
my larger 3 inch mandrel bent exhaust.  Not only has the hp to the ground
increased but my wife will ride in the car now.

Ned

-----Original Message-----
From: barmstea at IBB.GOV [mailto:barmstea at IBB.GOV] 
Sent: Wednesday, February 08, 2006 5:40 AM
To: Ned Ritchie
Cc: 'S-car List'
Subject: Re: RE: [s-cars] Stromung Exhaust

I have not experienced any droning Ned.  Had it as high as 90 so far.

Brian

----- Original Message -----
From: Ned Ritchie <Q at IntendedAcceleration.com>
Date: Wednesday, February 8, 2006 3:26 am
Subject: RE: [s-cars] Stromung Exhaust

> Please report on the sound and any droning while cruising at a 
> constant 50
> to 55 mph in high gear.  And secondly if there is any quieting as 
> the speed
> moves up to 60 mph and beyond.
> Thanks,
> Ned 
> 
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [s-car-list-bounces at audifans.com] On Behalf Of Brian Armstead
> Sent: Tuesday, February 07, 2006 3:58 AM
> To: S-car List
> Subject: [s-cars] Stromung Exhaust
> 
> Listers,
> 
> I recently upgraded to a full Gen IV Stromung system.  Here are my
> observations:
> 
> *The system is extremely well made.  The seams and bends are so nicely
> done and the system is so attractive, it's a shame it has to hide 
> underthe car!
> 
> *The stock system weighs a ton!  The Stromung system is half the 
> weight,which should help handling a bit.
> 
> *It sounds great.  I was worried that it would be to loud.  It 
> emits a
> nice mellow tone.  The car revs much freer now.  Can't wait to put Bob
> Myer's chip in to really feel and hear the difference.
> 
> *Get the extension kit. It you want the gorgeous tips to protrude 
> a bit,
> get the extension kit Stromung sells.  Otherwise, the tips are about
> flush with the rear bumper.
> 
> *Customer service is great!  Fellow lister Jeff Postupack is the
> intermediary for Stromung, and offers a very high level of customer
> service.  Thanks Jeff!
> 
> All in all, a very worthwile upgrade for those still on the fence. 
> 
> Regards,
> 
> Brian
> 93 S4
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