[urq] WUR findings

[Scott Justusson]

Gary
Try putting a vacuum ck valve in the line, on boost you get WUR
enrichment, on vacuum, you get nothing.  Glad to see someone else
playing with this, it's a decent CIS mod for sure.

Scott J

-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On
Behalf Of Gary Brown
Sent: Thursday, March 26, 2009 10:46 AM
To: urq at audifans.com
Subject: [urq] WUR findings

A few weeks ago I was having leaning condition under high boost.
Everything was working as they should, and found that the wastegate
actuation stud was stripped, causing the diaphragm to lift, letting the
boost spike. Fixed that, same problem. So...after lots of urq list
archiving and remembering some of the Bosch book topics, I remembered
that the WUP on this car was set up for cold running as well as boost
enrichment, but the hose set up made no sense to me. I have tinkered
with that before, but never quite figured it out. This time, I took an
old WUP (CPR) apart, and applied pressure to both nipples then vacuum to
both nipples. What I found was that the two nipples are placed in such a
way that the diaphragm moves the same direction under boost as well as
vaccum, the large one being the boost enrichment. What didn't make sense
is the on-off switch below #5 cylinder plug, with the two nipples on it.
It has one hose from the manifold going to it, and
 one hose that is teed off to go to both the large and small nipples on
the WCUPR. When the motor gets warm, the switch closes, and therefore no
vacuum or pressure goes to the CWPUR. This is as per the underhood and
IST docs. So....I by passed the switch all together...guess
what....enrichment under high boost! But, now enrichment under decel
too. When I re-install the vacuum hose from the manifold to the switch
and the switch to the small nipple, that will take care of that. But, it
does sound cool with that rolling burble under in-gear decel! I'm sure
that this has been written up somewhere, but I couldn't find it. 

HTH

Gary