Re: Tuning Tips questions

["Dominic Sorresso" <surrexi2@home.com>]

Yes, that's correct Bruce. I am using the word cell to mean the value in a
particular intersection of RPM and Kpa.

Dominic
----- Original Message -----
From: "Bruce Plecan" <nacelp@bright.net>
To: <gmecm@diy-efi.org>
Sent: Wednesday, August 16, 2000 6:09 PM
Subject: Re: Tuning Tips questions


> > > > Here's a couple of questions on your tuning tips dealing with the
> light
> > > > cruise section,
> > > Don't over analyse.   Don't make it more complicated then it is.
> > > Now with that said
> > > > 1 Once you have determined TPS signal at 40Kpa, you suggest adding
> > > > timing at that 40Kpa and RPM cell. The re-test at original TPS
signal
> > > > to determine "new" vacuum value. Do I now +/- timing at "new"
> > > >Kpa/RPM cell or go back to 40Kpa?
> > > >     What increments of timing would you +/-?
> > > Nope, it's tps vs MPH,
> > > look to see where you are K/Pa just to know where to make the timing,
or
> > > fuel change.
> > >   I cut things at 2d, unless there are initially no change or the
figure
> is
> > > just grossly wrong (that only comes with experience)
> > So in other words, the change in vacuum +/- is simply telling you
whether
> > the timing should be cut or increased, but at the original cell (ie.
40Kpa
> x
> > 1800rpm). Increase timing in that cell until there is no further
increase
> in
> > Kpa. And then go through same iteration for EACH cell representing
> probable
> > cruising speeds. This process, then, optimizes each point individually.
I
> am
> > repeating myself so I make clear to you what I have understood so far.
>
> Drop worring about the cell.
> Ignore the K/Pa other then at cruise your at 35-40-45-50, so you know
where
> to edit the map.
> You don't care how it changes, you want the lowest TPS
>
> > > > 2. When you say "drop off" as little timing between 40-50Kpa up to
WOT
> > > > (100Kpa), what increment per cell are you suggesting. What should
> > > >total drop off be?
> > > > For example, At 1800rpm and 40Kpa, value is 24.3. At 100Kpa, value
is
> 6
> > > Depends on car, and driveility.  No way to forcast what your engine is
> > gonna
> > > like.
>
> > Dropoff then is not just an integer that you deduct from each cell, but
> what
> > is indicated by the process
> > you described on top. Each cell tested and optimized individually.
> Correct?
>
> OK, just what are you calling a cell?.
> This almost sounds like your calling a entry on the map / table a cell.
> Bruce
> >
> >
> >
> > >
> > > > 3. What about cruise range within +/- 200rpm of the initial 40Kpa
> > > benchmark?
> > >
> > > Depends on lots of variables.
> > > What resolution is the table you working at and what are the break
> points.
> > > If the steps are 1200, 1600, 2000, then I'd run the cruise mode
testing
> at
> > > those steps in addition to what ever your cruise is that your
concerned
> > > with.
> > >
> >
> >
> >
> > Yes,the resolution is in 200rpm increments x 10Kpa increments.
> > Makes you long for using some of the telemetry systems in CART etc.
> > I understand the re-burns now.
> >
> >
> > > This is way you get into so many reburns to get it right.  You have to
> > look
> > > at the resolution of the table and kinda experiment around where ya
want
> > to
> > > be so that you can smoothly transistion to those conditions.  Like do
> you
> > > baseline testing on flat ground, and try to do it in both direstions,
to
> > > account for cross winds, mild grade changes etc..   Then move toward
> lite
> > > grades, and then larger ones.
> > >
> > > > I hope these questions make sense. they'll at least start giving me
a
> > > > clearer picture of how to start?
> > >
> > > One change atta time, and notes.  That's all you really need.
Document
> > > Document document  the easier it is for you to see trends developing
the
> > > quicker you'll be done, and ready to do another car.
> > > Then you'll see the )(#$)@#(    )#($#()#@    mistakes you made on
yours,
> > and
> > > go back and fix yours.   Then ya help someone else, then again, it's
aww
> > > $hit, and fix yours.   It's a continual learning cycle.  Sometimes
just
> a
> > > silly like comment from one of the other guys, and it's aw darn,
that's
> > > whats going on.
> > > Bruce
> > >
> > > > thanks,
> > > > Dominic
> > >
> >
>
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