Some Boost Controller Info

["Steve Evans" <sevans@radstone.co.uk>]

Phil,
>There's a subtlety that no one at Audi has been able to explain to me -
>in the earlier MBs, one line goes to unthrottled air, i.e., intercooler
>output.  On the later ones, it goes to throttled air, i.e., the inlet
>manifold.
>
>Anyone know why this change was made?
Are you sure about this? On my MB (same as yours) the frequency valve takes
its low pressure input from the intake elbow of the turbo and its high pressure
input from the back (bulkhead end) of the inlet manifold. I understood that this
tapping is from a drilling that runs the full length of the manifold to the
turbo side of the throttle. Is this not so?

Regards,

Steve

Steve Evans                       Radstone Technology Plc.
Principal Design Engineer         Water Lane,
PowerPC Group                     Towcester,
Tel: +44 (0) 1327 359444          Northants,
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Email: sevans@radstone.co.uk      ENGLAND