use of MAP in FI calcs

[alexpeper]

There are EPA high altitude emission standards and a test
lab in Colo.
Alex
----- Original Message -----
From: Dave Zug <dzug at delanet.com>
To: <gmecm at diy-efi.org>
Sent: Friday, September 08, 2000 12:49 AM
Subject: Re: use of MAP in FI calcs


> I left a thought out of my last post...
>
> If indeed the BARO is not re-calculated unless the car is
turned off and
> back on, What happens when you start the car at the top of
a mountain, and
> drive down to the bottom then drive 200 miles?  lotsa BLM
correction?
>
> food for thought.  Maybe why they changed it later?
>
> > 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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