RE: MAP signal dampening

[Carl Summers <InTech@writeme.com>]

Hi All,
   On a closed loop setup altering the O2 gains will help and to stabilize
rpm use the timing table.....If you put more timing at a higher KPA table
than at the lower it drastically stabilizes big cams....also if it is real
big...you will probably find it needs to be open loop at idle as lots of
overlap doesn't like 14.7 AFR....hth's
-Carl Summers

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-----Original Message-----
From: owner-gmecm@diy-efi.org [mailto:owner-gmecm@diy-efi.org]On Behalf
Of Ward
Sent: Friday, March 10, 2000 5:06 PM
To: gmecm@diy-efi.org
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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>


Ward





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