[s-cars] Rear suspension epiphany (Fritz und Hans invadeengineering dept?)

[Fred Munro]

Interesting info, Tony. Can you give us the contact info for AMD? - sounds
like something that should be in my "Suspension" file.

Fred Munro
'94 S4
'97 S6

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of Tony Guttmann
Sent: July 30, 2006 4:18 AM
To: s-car-list at audifans.com
Subject: [s-cars] Rear suspension epiphany (Fritz und Hans
invadeengineering dept?)


Some weeks ago I wrote asking about bushes for the rear suspension
cross-member.
Dave Forgie put me in touch with Addict Motorsport Design, who sell these in
aluminium for $75 a set. The originals are not purchasable--one needs to buy
the entire cross member for (in Australia) US$2250. When the suspension
people
removed the cross member, they had to burn out the original rubber bushes,
but
the steel core, through which the mounting bolts pass, was found to be
16.5mm in
diamter. The new bushes, and the factory bolts, are 10.5 mm in diameter, and
so
the new bushes, made by AMD, fit perfectly.

The suspension shop said that when they fitted the new bushes, everything
lined up
perfectly, compared to the slightly out of alignment bits before, and my
rear suspension
noise has disappeared, and the old bushes on other suspension components
that
appeared to be under strain are now perfectly aligned.

I pass this on for the possible interest of the list, no affiliation with
AMD, just
a happy customer. But the mystery remains--why did Audi supply bushes with a
16.5mm
hole and then pass a 10 mm bolt through them? Did they want the rear
subframe to wander
and twist around or what? And before you speculate--it's not that they
started life as
10mm and wore. The holes are perfectly round, and all four are the same
diameter.

Tony Guttmann
'94 S4 with 97,000km
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