Programming 101

[Bruce Plecan]

Once again if you haven't read the opening pages please do so at
this time.

The first two tables we covered where spark, and fuel so in that same
light we'll continue.

  Gm has a feature for extra power ie for passing, and heavy load
conditions (also makes ya feel like you're going fast).  For some
applications they use a WOT enable. it adds timing, and fuel.  Most
notably on the heavier vehicles there seems to be a delay to this
feature, at times, and then at other times it doesn't seem as noticeable.
On the 747 there are a couple of parts to this.  One
is that they add fuel, and timing.  The other part is that there is a time
delay, and rpm bypass.  So that at times, say from idle when ya floor
it it takes a moment for it to seem like your really acclerating, and
from higher rpm there is almost no waiting.  Now again remember this
as we'll be stumbling around with this from time to time.
  Reading down from the spark table, we stumble across some
interesting numbers at 015E-0165, in hex they range from 06 to 0E.
Since we are looking for timing in this area,  if we convert 0E to Decimal
we get 14, divide by 256, and multiply by 90 and we get 5.
  This might be a good area for an amount of spark that is added
to an enrichment for WOT.
  OK we're going to look now for some fuel.  Hmm, well we'll look
like we did with the timing, where the fuel tables are.  Well like for
the spark that is added there is almost a constant amount of fuel
added, but since they don't want the engine to make too much top
end power, and the resulting engine damage they probably turn
off the fuel on one end of the scale.  So if ya look at the end of the
fuel area, ya see exactly that, again depending on what application,
it reads hex 64 for a few entries, and then the last few are 00.  So
we wind up at 03C7-03D7 as being the fuel enrichment for WOT.
  Varifing the above is just test driving a few proms with a scanner,
and the DIY O2 display.  Adding lots of timing, in the WOT timing area
will set a bunch of knock counts, and turning off the fuel makes the
car lame, and the O2 display looks noticeably leaner.  Again, just
do it for a few moments, ya don't want to risk any engine damage.
  Well, we've now got just enough knowledge to get into real trouble.
By running too much timing/too little fuel you can cause serious engine
trouble, always remember TOO little timing, and you buy spark plugs.  TOO
much timing and you buy all sorts of internal engine parts, ranging from
head gaskets, to exhaust valves, and pistons, so sneek
up on making tuning changes.  ALSO remember TOO much fuel, and
you waste gas, and buy spark plugs.  TOO little fuel, and it's just like
buying parts from too much timing.  IF you have any doubts take
small steps, and also reread the tuning pages, and stare at fuel, and
timing tables til they really make sense.  Also, be sure to wear a
Con Shaped Hat so you aren't interupted too often.
No worries mate
Bruce       Again if repling to this edit down.  Couple sentences quoted
                 is fine, not the whole text. TY