use of MAP in FI calcs

[Carl Summers]

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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