[urq] Fw: Re: WUR findings

[Gary Brown]

--- On Sat, 4/4/09, Gary Brown <gmbchef at sbcglobal.net> wrote:

From: Gary Brown <gmbchef at sbcglobal.net>
Subject: Re: [urq] WUR findings
To: "Ben Swann" <benswann at verizon.net>, audi at humanspeakers.com
Cc: quattro at audifans.com
Date: Saturday, April 4, 2009, 10:40 AM







I studied that diagram over and over, as well as checking and re-checking the diagram on the hood. 
Still, in the stock set up on the urq, although the WUR is designed for boost enrichment, it is not "hosed" properly from the factory for it to work!
I still haven't  run a DMM to measure duty cycle under operating conditions, but the way I understand it, the manifold pressure governs control pressure under all levels of boost, and it overrides the WOT switches 77% DC, which, in MY case, would cause leaning at anything over 10 psi. Now, 15 psi, no leanout  according to my A/F ratio gauge. Also, the underhood temps are relatively cooler, even after a spirited run.
I guess I should run a fuel pressure gauge as well under operation and record the readings under all phases of control pressure.
Gary
--- On Fri, 4/3/09, Huw Powell <audi at humanspeakers.com> wrote:

From: Huw Powell <audi at humanspeakers.com>
Subject: Re: [urq] WUR findings
To: "Ben Swann" <benswann at verizon.net>
Cc: gmbchef at sbcglobal.net, quattro at audifans.com
Date: Friday, April 3, 2009, 9:32 PM

Ben Swann wrote:
> Gary,
> 
> Without remembering exact  specifics on this, I'll give you enough
info. to support
> advice to leave the hose routing as indicated in the stock layout.
> 
> Basically the WUR has two port on it...

I just thought I pop up this link:

http://www.humanspeakers.com/audi/vacuum-system.htm

It's not CIS-turbo, but it does show the plumbing for the WUR in a n/a
setup.  Might be of some use to someone, perhaps.

-- Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/