Re: CPU-controlled '88 ur-Quattro WG?

[New England: July-August & winter 22-Dec-1994 0844 <samaras@wrksys.enet.dec.com>]

Hi glen.  I've done *lots* of playing with the boost on my 86 5000CSQ. I too
first played with the WG spring and flirted with the automatic shutdown.
Currently, I'm running about 12 lbs of boost (1.8 bar on the display). I have
the computer controlled valve disconnected. I have also "modified" the pressure
sensor in the CPU to prevent shutdown.  I set the new shutdown boot level to
~12.5 lbs of boost.   Anyhow, I also get the same partial throttle power surges
you mentioned.  My guess is it's caused by the ignition timing being adjusted
on the fly.  I never see the knock light come on unless I use cheapo gas. 



...bill

>  I disconnected the hoses to the WG on the 5000CSQW to eliminate the
>  possibility of the CPU changing the boost level for the purpose of
>  testing different WG springs and also for testing of my modification to
>  allow external adjustability of the WG, and to set the boost level
>  without interference by the CPU. After the "static" boost level was
>  adjusted as high as possible without CPU-shutdown (~1.3 Bar) the hoses
>  were reconnected.
>
>  On a related note, I often observe what feels like a small loss of power
>  as the boost comes up to max, it feels like the CPU might be reducing the
>  boost via those WG control hoses, but the "knock" light never comes on. I
>  may try disconnecting the WG hoses and testing to see if the perceived
>  power loss might be due to the CPU reducing boost.
>
>  -glen