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Subject: RE: Different engines in S4 vs 200Q

Ralph Poplawsky wrote:
<I have been wondering about this for a long time.  Why are the S4 and
'91200Q engines so different?  The intake manifold seems very different and
cosmetically they are very different.  I understand there are a lot of
mechanical differences as well.  Why did Audi do this??  I know about the
overboost, but there really isn't much extra power in the S4, certainly lots
less than you can get on either engine with a simple computer change...
BTW, I think the 200Q engine looks nicer.>

Different body, designed for the V6 (with the S4 5-cyl selling much lower
volume) means that the big intercooler etc. on the 200 wouldn't fit well and
needed redesign of intake and manifolds.  Changed from distributer and single
coil to distributorless with coils for each cylinder (better more modern
design), changed tranny to new manufacturer (with resulting problems for at
least 1992).  They used the 3B ('91 200q engine) in the S2 coupe, again
because that body was designed for the 5-cyl and it fit.  People doing the S2
conversion thus use the 3B over the S4 engine, where possible.  At least,
that's my take.

I'm in the process of updating my '91 200q web site; new stuff by the end of
the weekend...

Scott Mockry has also posted a bunch of stuff on his web site pertaining to
performance differences between the S4/S6 and the '91 200q, as well as some
other cars
(I think...)

HTH, Chris Miller, Windham NH, c1j1miller@aol.com