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Debate y preguntas relacionadas con el curso Fundamentos de la puesta a punto de la inyección electrónica de combustible (EFI).
= Hilos resueltos
Calculating mass air flow at a certain rpm at WOT on a naturally aspirated engine, assuming that the VE is at 100% to approximate the injector pulse width for a starting point is simple.
But is there a way to calculate the mass air flow or VE at a certain manifold pressure where the throttle is not at WOT (cruise) or when there is a overpressure (boosted engine)?
Air density would change, that can be calculated fairly easy, but the mass air flow?
It would be awesome to calculate that for a starting point and then adjust while looking at the lambda.
I built a spreadsheet that would calculate Grams per Second with "knowns" and some "assumptions" when I worked at Identifix (Automotive Technical Hotline for professional Technicians in the aftermarket).
Engine Displacement in CC
Engine Displacement in Cubic inches
RPM
Engine Vacuum
MAP Absolute
Barometric Pressure
DR
Assumed VE
CFM
g/sec
Lb/M
Kg/h
3500
214
715
20.5
9.1
29.6
0.307
0.75
10.18
3.96
0.5234
14.24227779
3500
214
2500
23
6.585131579
29.6
0.223
0.75
25.79
10.04
1.3265
36.09496747
75% VE
Varibles to be adjusted are in Yellow
G/Second reading you should see on the scan tool
Assumed VE
Calculated values
75% VE WOT
3500
213.6
7000
0
29.9
29.9
1
0.75
324.45
126.27
16.6873
100% VE
3500
213.6
6000
0
29.9
29.9
1
1
370.81
144.31
19.0712
Corrected Baro
30.1
Altitude in Feet
500
Baro Correction Factor
0.982894737
75 EV
100 VE
UnCorrected Baro
29.58513158
Calculated Load?
0
0
How can I edit or put new values in that? Excel?
