[Gmecm] $58 Baro code

[Scot Sealander]

The baro is reset with the engine not running.

I would not even bother with trying to reset the baro while running using
the 3 bar sensor.  The method GM used would force you to have to fill in the
BP reset table with different values with every different engine combination
it is used on.  And I would bet that it would not be all that accurate.

Just use a 1 bar MAP sensor that is reading the ambient pressure, and read
baro directly anytime you want.  You will have to check a number of 1 bar
MAP sensors to get one that reads accurately.  I found that I could get ones
that read from 95 to 100 kPa at my altitude.  I think that I am at about
600-700 feet.  I am not sure that a 2-3 percent difference in baro is going
to make that much difference in the fueling calculation though.

Scot

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of Dig
Sent: Thursday, July 26, 2007 11:25 AM
To: gmecm at diy-efi.org
Subject: Re: [Gmecm] $58 Baro code

Strange... I never saw my post come across, was starting to wonder if it
made it out there.

The thing I don't get is how/where it's getting updated at all.  The values
we're seeing aren't the default, which is what I'd expect to see.  

The voltage drop during cranking is the only thing I can figure, but that
would seem to me to be a bad time to read the baro...

I think the initial fix will be to have it just read on key on/not running.
Not gonna help the altitude folks, but it's better than what's there today.
Future work, will try to get the running update working.

Thanks for the input.

Dig



----- Original Message ----
From: Scot Sealander <ssealander at Stny.rr.com>
To: gmecm at diy-efi.org
Sent: Thursday, July 26, 2007 9:19:07 AM
Subject: RE: [Gmecm] $58 Baro code


I deleted most of the post...  No need to repeat it.

The reason the code does not reset the baro when using 2 bar code, is that
the method used to reset the baro is worthless on a boosted engine.  All
that routine does for a boosted engine is reset the baro to the present MAP
if the engine is not running.  Simple enough.

Scot

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of Dig
Sent: Tuesday, July 24, 2007 1:37 PM
To: gmecm at diy-efi.org
Subject: [Gmecm] $58 Baro code


I've been racking my brain for a while on this... hopefully someone can
point out something obvious that I'm missing?


_______________________________________________
Gmecm mailing list
Gmecm at diy-efi.org
Subscribe: http://lists.diy-efi.org/mailman/listinfo/gmecm
Main WWW page: http://www.diy-efi.org/gmecm



_______________________________________________
Gmecm mailing list
Gmecm at diy-efi.org
Subscribe: http://lists.diy-efi.org/mailman/listinfo/gmecm
Main WWW page: http://www.diy-efi.org/gmecm