[Gmecm] $58 Baro code

[JohnsHome]

The LG-4's had a dedicated Baro sensor that was mounted on the ESC module.
It was keyed differently so you couldn't mistake it for another range.
Jp

> -----Original Message-----
> From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org]On
> Behalf Of John Welch
> Sent: Friday, July 27, 2007 1:32 PM
> To: gmecm at diy-efi.org
> Subject: RE: [Gmecm] $58 Baro code
>
>
> This is what Lotus did on the 4 cylinder Esprit.
> Added a dedicated Baro sensor and used it to read the real
> pressure whenever
> they wanted.
>
>
> John Welch
>
>
> -----Original Message-----
> From: gmecm-bounces at diy-efi.org
> [mailto:gmecm-bounces at diy-efi.org] On Behalf
> Of Dig
> Sent: Friday, July 27, 2007 9:27 AM
> To: gmecm at diy-efi.org
> Subject: Re: [Gmecm] $58 Baro code
>
> That's what I was thinking too... a second baro sensor. Got a few free A/D
> inputs, although we're using a couple already.
>
> The bad baro readings mess up the boost calculation, which gets used in a
> few tables.
> As you say, 2-3% of 15 psi boost is not noticeable.  What we were (are)
> getting is baros in the 50-60 kpa range, which really freaks things out.
>
> The key-on/engine not running read should fix the really odd-ball values,
> though.
>
> Thanks,
>
> Dig
>
> ----- Original Message ----
> From: Scot Sealander <ssealander at Stny.rr.com>
> To: gmecm at diy-efi.org
> Sent: Friday, July 27, 2007 9:09:16 AM
> Subject: RE: [Gmecm] $58 Baro code
>
> 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?


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