use of MAP in FI calcs

[Dave Zug]

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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