[V8] Re-birth of my '90 200 tq

Brian K. Ullrich bullrich at ullrichsys.com
Mon Nov 23 17:34:48 PST 2009

Thanks Dave. I have not yet checked the WG Diaphragm yet. Ben mentioned that
I should check the lower WG hose first.


Boost does not build too fast. It seems perfectly fine boosting until that
1.7 bar buck. And the buck is relative.





From: David Michael [mailto:adavidmichael at gmail.com] 
Sent: Monday, November 23, 2009 12:45 PM
To: Quattro List
Cc: bullrich at ullrichsys.com
Subject: RE:[V8] Re-birth of my '90 200 tq


Brian K. Ullrich wrote:

I do have a couple of issues with the driveability of the car. Two areas 

concern me, and they are likely related. 

First, the idle is a little rough once the car is warm, and it is prone to

stalling at idle then.




Have you checked your wastegate diaphragm? Sounds like you may be hitting
the overboost cutout, which is very violent. I am suspicious because you are
getting such high boost occasionally - the only time I have seen that level
is when my WFG diaphragm went.  The other telltale is if boost is building
very fast - it tends to (unfortunately) build la little more slowly with the
WGFV is working.


You can check by hooking a mity-vac to the WG diaphragm port.




90 200 QA



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