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Type 44 boost loss

I'm looking at the weirdest problem on Roger Galvin's 200TQ 1B (MC-1)

It was running at 1.2 bar boost.  I found and fixed a whole raft of
things, and got it to 1.4 bar.  At that point, the long hose from the
turbo to the far end of the single-pass intercooler proved to be

I repaired _that_, and got to 1.6 bar.  Then I discovered the rear of
the Michelin man hose was leaking, and had to wait a week or so before
I got a replacement.

With the new Michelin man hose, we see a reliable 1.7 bar (should be
1.69, but the display's not wide enough) most of the time.  On long
fast runs a sudden 'sporty' session produces 1.8 bar, and sometimes the
most peculiar sensation, as if the system is dumping air in quantity.

At first I suspected the sleeve joint in the long hose (see second
paragraph).  I found what seemed to be a 'bubbling' of the joint that
hadn't been there before.  Anyone seen this?  Any other ideas?

I'm sure it's a boost air problem.

(Obviously codes, output diagnostics, MityVac, WGFV LED, etc. all done
 and clean.)

 Phil Payne
 UK Audi quattro Owners Club
 Phone: 0385 302803   Fax: 0870 0883933