[urq] urg computer question

[Michael Hopton]

If you don't want to go EFI, it may be easier just use a MAC11 with an
interface card to the MAC02 wiring loom with some additional wires for
the knock sensors etc. and swap the intake temp sensor to the later
higher
value ones? You will certainly get much more ignition advance and have
the bonus of premium maps. You (or Steve E.) could even change the maps
for the different flywheel position sensors. Or change the whole loom
and CIS to one from a 5000 turbo...

Mike

-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On
Behalf Of Steve Eiche
Sent: Tuesday, January 11, 2005 3:56 PM
To: a.j.gaidos at comcast.net; 'urq at audifans.com'
Subject: Re: [urq] urg computer question

Anton,
There are actually three different variations of the MAC-02 PCA.  The
"RDH" schematic is based on a revision of the version 1 PCA. There is a
local gentleman that has a copy of the actual schematic for some version
of the MAC-02 from Hitachi, but I have yet to arrange getting a copy of
it from him, although he has offered. The circuitry itself is pretty
basic, so I usually don't even bother with the schematic. FWIW, the
major components on the PCA have been NLA for over a decade, with little
or no documentation as to their exact function or specs.  

I know where you are going with this, but personally I think that the
best solution would be to make a replacement PCA that could run improved
code with modern components.  I don't see any reason to duplicate what
is a poor design to begin with.  While I was at it, I would fix design
issues like the stupid low resistance intake air temp sensor and replace
the MAP sensor with a modern Motorola part, etc.  You might as well add
some rudimentary diagnostics and external programming while you are at
it. Maybe that is what you have in mind.  I do believe that the main
connector is still available from AMP.  

As to the mechanical specs for a CAD, you might as well make those
yourself.  That's easy. I doubt Hitachi even has those anymore.

Steve 



One page schematic. I was expecting more. Now I need a parts list to
source parts and a mechanical drawing for the board outline, keepout
areas, mounting and tooling holes. Fixed components like connectors
would be a must as well.

... I suppose you all see where I'm going with this.

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