Re: Use of MAP in FI calcs

[Ludis Langens <ludis@cruzers.com>]

Bruce Plecan wrote:
> 
> How about as it applies to EGR, and when your working with a couple million
> cars, and the EPA sometimes close ain't good enough

Yes, BARO is used there.  BARO is also sometimes used in the coolant
temperature advance adjustments.  Some ECMs index by CTS and MAP, some
by CTS and (BARO-MAP), and some can do either.

>  I would think that a few kPa variation in baro would have minimal effect on
> scavenging.

Here's the relevant table for a Fiero 2.8.  The table's value gets
multiplied into the "regular" VE value.  It is also used in the EGR calculations.

ExhaustVETable  DC.B 96,32,9    ;<487> Exhaust volumetric efficiency
        ;         8  12  16  20  24  28  32  36  40 '00 RPM
        DC.B    141,141,141,138,134,130,128,128,128 ;75 KPa BAP
        DC.B    134,134,136,134,130,128,128,128,128 ;85
        DC.B    128,128,128,128,128,128,128,128,128 ;95
        DC.B    128,128,128,128,128,128,128,128,128 ;105


-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/


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