[urq] Wow!!!!

[urq]

Thanks for the info Gary!

While it is great to hear that you have found something that works to your satisfaction, I'm a bit mystified why there'd be any need to provide enrichment under vacuum.  

With a fuel pressure gauge and an air pump you could figure out the transfer function (Control Pressure vs. manifold pressure) of what you now have.  I suspect that you could plumb the CPR/WUR the way the factory did and adjust the CPR/WUR to give similar readings.  I don't have a copy in front of me, but I'm pretty sure the IST docs have a copy of this function.  It would be quite useful to see how your CPR/WUR compares.  The factory settings are likely a compromise between power and emissions ... 

BTW, I placed a copy of the vacuum plumbing diagram from my '83 49-state urq on the yahoo group site if anyone needs to refer to it.  I have a copy of the MC underhood vacuum plumbing (50-state) too, but I never posted it to the group site.  I need to finish up the intake and vacuum plumbing on my car and get this sticker installed before I get the car smogged this summer ... 

Steve B
San Jose, CA (USA)

-----Original Message-----
From: Gary Brown
Sent: Sunday, March 29, 2009 1:25 PM

Mike-
�
I don't think I am lucky enough to have stumbled onto one of those "open hot" switches. Actually, wasn't aware of one. In that case, the WUR would see vacuum to both ports at the same time�with manifold vacuum and pressure to both ports at the same time�under boost. The way I set it up is the small port� sees vacuum ONLY�and the large port� sees boost ONLY.
The only way I was able to figure that out is by using a working spare WUR and using my mity-vac to apply vacuum and pressure alternatively to the ports�and visually determine how the stupid thing could�give enrichment under vacuum as well as boost.�
All of my components are relatively new and operational, and still was getting lean conditions.

Gary
--- On Sun, 3/29/09, Mike Del Tergo <mdeltergo at hotmail.com> wrote:

From: Mike Del Tergo <mdeltergo at hotmail.com>
Subject: RE: Wow!!!!
To: urq at audifans.com, gmbchef at sbcglobal.net
Date: Sunday, March 29, 2009, 3:12 PM




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Gary,
I've been following the thread and stumbled across some of the same things Scott mentioned when I had to reroute my vac lines�from memory after a motor out rebuild over a decade ago.� (Including the tiny little temp operated vacuum switch on the back of the head that Audi decided to make 2 that mirrored each other, one open hot, the other closed hot, nice!) But I have not seen you say if your items were working properly or not before hand.�� This is not a "must" if everything is working properly.� I knock wood every time I hear CIS and MAC 01 horror stories and have driven and EFI car, but so far nothing I have had my hands on as offered enough of a leap in performance over my "stock" that I'd want to take the time or money plunge, (on a 10V platform).
Mike

From: Gary Brown <gmbchef at sbcglobal.net>
Subject: [urq] Wow!!!!

?For those of you still running a 10v?turbo 5 with a WUR, that mod I did is a MUST! The car was leaning out under boost...as little as 12lbs at high rpm. This is the ONLY way I know of to stop it...with stock FI?parts. My particular urq is running a TAP/EPL chip, Dialynx ex. manifold and TAP spring with cap mod.?
?
I tried everything known and reccomended by the list, including relaying the fuel pump.
No matter how much boost I put in,?the A/F gauge is always in the green under heavy load.
?