Analog Meter capability

[swagaero]

Shannen Durphey wrote:
> 
> swagaero wrote:
> 
> > snip
> > >
> > > Tech 1A is convenient, but you don't know what you're missing.  You should see
> > > MAP signals on a lab scope.  On a 4banger you can watch intake pressures
> > > "bounce" when the valves close.  Just plain wild, to me.
> > >
> > > Shannen
> >
> > the problem is when you are trying to smooth out the signal from a lumpy
> > disturbed cam I need to see the signal average and not the valves
> > closing which is neeat to look at with my slow scopee.
> >
> > Steve
> >
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> > Well, okay.  On my 302Chev ( 214deg intake duration, 234 degrees exh @.050") the
> > 83 Camaro ecm is so slow that even the "average" vacuum at idle isn't average.  I
> > haven't tried installing a lumpy cam into anything newer to see what the average
> > idle vacuum is, so I don't know what I'd see.  With my combo, I believe that the
> > information is updated to the Tech1 even slower than it is collected from the MAP,
> > so it would be difficult to use displayed info to map MAP.  There are other ECM's
> > which do not update scan tools as fast as they collect information.  As far as
> > watching the valves close, I find it interesting because the scope traces gave me
> > a much more accurate "feel" for what goes on within the intake manifold than a
> > vacuum gauge or Tech1 data stream.
> 
> Turbo City sells a MAP sensor which can be adjusted to compensate for a lumpy cam.
> I don't know enough about electronics yet to build one, but I'd guess that you could
> build something pretty easily.  Then, the effects of valve overlap could be negated
> quite a bit.  Is that feasible?
> 
> Shannen


3?? opam does the trick on a map
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