use of MAP in FI calcs

[Dave Zug]

In the Turbo-GP code (727) it happens at key-on.  after checksum of coarse.
Stores it, and from what I can tell, never *writes* to it again.

The program starts at #A000, so you can see its relatively early that the
BARO is set. I can find no reference to call the routine again or a routine
that is earlier in the code that will execute into it.

(if I have things sort of right here.. I'm sure I'll be corrected if not
;-)


A0D8 : LDAA  #$30  analog channel # (?) (map?)
A0DA : JSR   $E8B2 <-- calls to 4000 set
A0DD : STAA  $0051 <-- raw MAP
A0DF : STAA  $004f <--- Map from channel #$30   !BARO initial load?
A0E1 : JSR   $E902 <--FUEL? CALCS 018B,018C,004F,0058,00E1(maPv/2),00DF,0053
A0E4 : LDAA  $0058 MAP RELATED:   (map volts / 2)


----- Original Message -----
From: Carl Summers <InTech at writeme.com>
To: <gmecm at diy-efi.org>
Sent: Thursday, September 07, 2000 6:40 PM
Subject: RE: use of MAP in FI calcs


> If I remember correctly GM does a baro calc when the engine is shut
> down....never did figure out whether this happens at key on
also...anybody??
> -Carl Summers
>
>
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> -----Original Message-----
> From: owner-gmecm at diy-efi.org [mailto:owner-gmecm at diy-efi.org]On Behalf
> Of Heelandtoe at aol.com
> Sent: Thursday, September 07, 2000 6:18 PM
> To: gmecm at diy-efi.org
> Subject: use of MAP in FI calcs
>
>
> I've noticed that in most ECM's all the tables that use MAP as an index
> stop
> at 100 kPa.  Since its conceivable that MAP could go above 100 kPa on a
high
> pressure day at WOT, I'm betting that the computer normalizes it with the
> barometric pressure as in mapbar = 100 * map/baro. This would account for
> the
> day to day variation in barometric pressure and normalize mapbar so that
it
> better represents true engine load.  Have you guys seen any similar
> operations in your disassemblies?
> jc
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