RE: MAP signal dampening

["alexpeper" <alexpeper@email.msn.com>]

Pnuematics can be modeled  in electrical terms.
Capcitor = tomatoe can, restriction in resistor.
Many software digital filters will not work as intended if do not
have signal conditioning. such as r-c filter.
Alex
----- Original Message -----
From: Ward <WSpoonemore@excite.com>
To: <gmecm@diy-efi.org>
Sent: Friday, March 10, 2000 7:05 PM
Subject: Re: MAP signal dampening


> Bruce you absolutly correct. if you try to mechanicaly filter the MAP it
> will be wrong some where else. This is fixing a leaky fountan pen with a
> rubber glove.
>
> Ward
>
>
> On Fri, 10 Mar 2000 15:07:12 -0500, gmecm@diy-efi.org wrote:
>
> >  Remote mounting,and large lines can dampen the MAP signal, but that's
> >  usually exactly what you don't want to do.  I'd recommend looking in
the
> >  code for filtering rates or such.
> >  Unless you want a delayed response to everything else, ie transistions.
> >    I've tried min cross section hoses with 1-2-3 orfices in them, large
> line
> >  (3/8") with restrictors, small tomato paste cans used a dampening
> volumes,
> >  I have never gotten very good results with any of it.
> >    There is no universal answer for this, as far as I know.
> >    Big cams have a lumpy idle, bigger cams have a lumpier idle, if
that's
> >  what your talking about.  The dumber the ecm is at idle the less this
is
> a
> >  problem.
> >    I after trying lots of answers, I perfer to use the oem gm small
> plastic
> >  hose (ie 1/16" ID), and mount it as close to source as possible.
> >    If you keep hitting the ASR (anti stall routine), and see the IAC
jump
> all
> >  around, then try the different pintle route.
> >    Sometimes lots of advance helps (at idle).
> >  Grumpy
> >
> >  ----- Original Message -----
> >  From: Swayze <kswayze@bellsouth.net>
> >  To: <gmecm@diy-efi.org>
> >  Sent: Friday, March 10, 2000 2:31 PM
> >  Subject: MAP signal dampening
> >
> >
> >  > will remote mounting a map sensor (attached to manifold with vacuum
> hose)
> >  > dampen some of the idle fluctuations or average out the MAP signal?
If
> >  so,
> >  > what is the proper ID tubing?
> >  > byE
> >  > Mike
> >  > Swayze
> >  >



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