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RE: Different engines in S4 vs 200Q

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.

Thanks for the wisdom that I can feel coming...
Ralph Poplawsky
'91 200Q

At 01:13 AM 3/27/98 -0500, you wrote:
>>I'm getting an intermittent whine while on boost on the '93 S4. It is a high
>>pitched whine that increases in intensity (slightly) as boost increases. I
>>have not been able to isolate where the noise is coming from, as well it
>>happens under most ambient conditions. I don't seem to lose any boost as I
>>get he same readings on the VDO gauge whether the car is whining (no pun) or
>Yours is a different engine than the one in my 200q but I had similar
>symptoms when the multi-pronged breather hose on the rear of the valve cover
>rotted through last year ... it would still make full boost but also did a
>passable impression of a small airhorn.  The funny thing is that it didn't
>leak under vacuum and wouldn't leak unless the car was under load ... I only
>found it when I removed the valve cover to replace the timing belt.
>    _                _
>   / |      _| o    | \       _| o  Jeffrey Goggin
>  /__| | | / | | __ |  | | | / | |  audidudi@mindspring.com
> /   | |_| \_| |    |_/  |_| \_| |  http://www.mindspring.com/~audidudi/