From AFM to MAP

[Eric Fahlgren]

William Shurvinton wrote:
> 
> Excuse me for being stupid (again) but I think you are saying that you need
> RPM &MAP to calculate AFM output. In this case I understand OK. If not I may

Yes, Bill, you understand correctly.

   f(RPM + MAP + IAT) == f(speed + density) == estimated flow

(IAT == Intake Air Temp, required to turn MAP into density.)

VE is usually assumed to be encoded in the function rather than a
parameter to it.  This is the source of that fundamental difference
between SD and MAF: when I change engine characteristics (big cam,
headers, porting), I change VE, hence need to retune my VE maps to
get SD working well again, while MAF remains more-or-less correct.

-- 
Eric Fahlgren                            Mechanical Dynamics, Inc
efahl at adams.com                          Ann Arbor, Michigan, USA

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