Re: Tuning Tips questions

["Bruce Plecan" <nacelp@bright.net>]

> > > 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
> >
>
> --------------------------------------------------------------------------
> --
> > To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> > in the body of a message (not the subject) to
majordomo@lists.diy-efi.org
> >
>
> --------------------------------------------------------------------------
--
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo@lists.diy-efi.org
>

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo@lists.diy-efi.org