OEM algorithms (DSM)

[Jim Pieronek]

Jonathan R. Lusky writes:
 > 
 > > The nice thing about do-it-yourselfers is that out-of-time is never
 > > true!  We had pretty crummy instrumentation, the most interesting of
 > > which was a box mounted on top of the dash that could show four
 > > user-selectable engine parameters.  There was no recording capability.
 > > Those boxes were the cause of many rear-end collisions!
 > 
 > How did yall tune EFI before UEGO's???  I know the box you are talking
 > about, we had one too.  Never did figure out what the thumbwheels did
 > or how to make the prom burner work, and GM wouldn't give us any docs. 
 > 

OK, you got me.  What the heck is a UEGO?  In late '85 I left GM for
my current job, which does not involve engines.

I never saw any docs on the heads-up display either.  As I recall,
there was a location in ECM memory that the software could look at to
see where the thumbwheel (a pot) was set.  There were also some
digital inputs.

This all brings back a lot of old war stories about that job, like the
time we got a catalytic converter so hot that the carpeting melted and
smoked... and several hand-made engines that we wrecked... what fun
that all was.

- Jim