Re: MAP signal dampening

[gabe <gellett@earthlink.net>]

The way my Electromotive ECU's software compensates for the big cam is that it
has a "blend" table based on RPM that blends a percentage of the TPS voltage
with the MAP voltage to come up with a stable reading at idle & low RPMS.

It seems to work well, when I turn off the option, I have several drivablilty
problems.

Maybe one of the code wizards among us can figure out something like this for a
GMECM.

Gabe

nacelp 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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