Boost, diaphragms etc. update

[orin@netcom.com (Orin Eman)]

Well, I effected a temporary fix to my wastegate diaphragm with some
silicone gasket goo and glass fibre cloth.  I don't expect it to last long,
but it's working for now...  I should have gone to a boat builder and
gotten some kevlar cloth; that would have been stronger and more flexible.
I'm still waiting on prices to get these manufactured...

So, with boost under control, it was time to have fun increasing it.
I decided to try the pressure regulator approach - disconnect the solenoid
then take the line from the manifold to the solenoid to the input of 
the regulator then the output of the regulator to the upper port on the
wastegate.

With this arrangement, I was able to get slightly more boost than normal
and it was controllable with the regulator so it was time to hack
the computer...  I had already removed the original EPROM and put in
a socket (unsoldering that was a whole bunch of fun...).  With help
from Robert Houk and Scott John Mockry, I changed the overboost table
(0xCD to 0xF8 and the preceding entry increased to maintain the ROM
checksum for those that are interested).

Well, does it work?  Absolutely!!!  I have the manifold pressure up
to 1.8 bar so far (indicated on the digital guage, corrected for the
guage reading .1 bar low).  Wheeeee!  It's a completely different car.
It now loves to be on boost, even at part throttle whereas before it
didn't much like to be until you hit the WOT switch.

My next project is to build a little op-amp buffer circuit to correct
the digital guage.

Anyone got approx HP vs boost figures for the MC engine?  Thanks in
advance,

Orin.

1986 5kCSQ 1.8bar homebrew
1995 90Q   (squashed and still at dealer being fixed)
1996 Chevy S-10 (Audi parts gopher)