[s-cars] Noisy Stromung in the rain

[QSHIPQ at aol.com]

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Heavy rain and exhaust noise has been a problem for years in audi quattros
IMO/E.  In the 11 years running 3in exhausts, it's something you live with.  For
the S car v Stromung, I suspect we are speaking of a REALLY heavy rainfall.
I thoroughly enjoyed Bill N's postulation, but I think it's simpler than that.
 Water gets on a spinning driveshaft and it will fling water.  When it does
onto pipes, they sing.  I believe Audi themselves addressed this with the heat
shields (between exhaust and driveshaft) on the S car to reduce this
phenomenon.  It does IME/O.  My urq with a bone stock exhaust (and no heat shields
between driveshaft and exhaust) will sing in a heavy rain quite regularly.

I'm not sure I'd adjust anything, but certainly inspect for heat shields and
proper fitment.  I've also seen many Stromung exhaust installs where the
center crossover section was removed all together.  I don't believe at all this is
necessary (or safe), at most, some flattening of the crossover section or heat
bend/crimp of the pipe retains this center section.

HTH

Scott Justusson
QSHIPQ Performance Tuning (to a low E in high humidy:)

In a message dated 9/24/2003 6:52:09 AM Central Daylight Time,
jpostup at yahoo.com writes:

This is the first time I am hearing such a report in the 3 years I've been in
the Stromung GP scene.

I think Taka and Scott have some useful ideas to check.  What is the
condition of the gaskets at the 4 mating surfaces? (DP to turbo, wastegate pipe to WG,
DP to center, center section to rear muffler)

Stromung does report that the stainless steel will expand (hot) and contract
(cold) to some degree. Given that, chassis clearance becomes really important.


Best way to set it up is on a lift, loosen all bolts and adjust it so there
is not chassis interference. Some installers place a temporary shim to retain a
fixed position down the length of the system.
(Remember the hangers are flat stainless steel and can be bent slightly to
adjust the Up/Down location of the rear sections. )

Then starting from front to back tighten each bolt gradually. Snug each bolt
initially then return for a final tightening sequence.

HTH
Jeff Posto