MAP signal dampening

[Programmer]

Advance is the big key--but that's just MO.
Here's the rule of thumb I've used:
Cam duration of 270--set initial to 12BTDC 700 RPM Idle
                             280--set to 14 BTDC    1100 RPM
                            290 --set to 16 BTDC    1200 RPM
                            300   as high as 19 BTDC   1400 RPM
                           310    18 to 20 BTDC.   1500 RPM
Limited by hot starter kick of course <g>... Limit total to 34 if
compression is raised. Higher compression can stand higher
duration and lower idle RPM as base. Takes a lot of playing around--but not
too much to nail it right. Optimum advance varies with engine design...but
should basically be dialed all in around 3500 RPM.
-----Original Message-----
From: nacelp <nacelp at bright.net>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: March 11, 2000 12:31 AM
Subject: Re: MAP signal dampening


>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 at bellsouth.net>
>To: <gmecm at 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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