Air/fuel Values

[roberto2000]

Just wondering what people would think would be "safe" values to use in this chart
I am trying to figure out target air fuel values

[DRAGPAK]

Would not open for me.

[Horsewidower]

Please define the y axis.

[roberto2000]

Y axis Manifold Air Pressure

[Horsewidower]

Yep, I figured that but kpa, psi, ???

Some other metric? starts at 6 goes to 94.

[roberto2000]

This is the quote from the manual
I am unsure of the units if is is kpa, psi or...

Target Air/Fuel Ratio
This matrix is used to enter the target air/fuel ratio that the ECU will maintain when running closed loop. It can be
programmed for values between 10:1 and 18:1. The matrix is an 8x8 that is defined by RPM in the X (bottom) axis and
engine load (MAP reading) or TPS value in the Y (left side) axis. The user must input proper A/F ratio values in all of these
cells.

[Pat_in_L.A.]

Wouldn't open here either. Which processor?

[NavySVO]

Rob,

I could open it, but for others you might want to try CTRL+Print Scrn and then paste it into whatever program you use for jpg and then post it as a picture. Just trying to help out.

[Alex L]

mike:
that looks non EEC; megasquirt AFR target table maybe? if its running a wideband input (as checked), then those values make sense. now, the manifold pressure values still dont make any sense for a turbo application.

the la3 target fuel tables are all stoch in the lower left corner; after you start loading up, target AFR would be 11.5:1 ~ 12.5:1, depending on lucky you feel

[Horsewidower]

If I remember right I think Caroth has this table. I asked him about something similiar at one time. I think...

My take on the table, again without really knowing the correlaton of the load numbers to a known metric such as kpa or psi etc, is that it is generally running far too lean.

But I don't think I'd do anything until I determined what the y axis values stand for.

[caroth]

For those of you who don't have MS Word, here is the table roberto2000 posted.

I think you need to give us more information about what you are trying to tune. Is this turbocharged? What fuel will you be running? Street car / race car?

The Ford base fuel map is based on load which is a calculation of mass air flow and engine speed.

In general, a turbocharged 2.3 will need a high load, high boost air/fuel ratio of 12.0:1 to be safe. On some street cars I tune with a weak intercooler, I will drop AFR down to 11.5. The PE has an 11.4:1 AFR at high load, the LA3 has an 11.1:1 AFR at high load.

[caroth]

Here are base fuel AFR values for the LA3.

[Alex L]

caroth, thanks for the actual AFRs, finally got around to updating my .xdf to show something useful on that table after your help.

[roberto2000]

Thanks for the responses guys
and sorry about the lack of clarification I am muddling through this
the example I posted was cut and pasted from the manual and was for a normally aspirated engine.
Mike the setting is a value but not like 'open loop' it is to give the computer a target to try to achieve while closed loop.
I am trying to get these values set up so I can run an auto tune program that uses these values to automatically set the pulse width to achive the air/fuel values recorded

Yes the graph y axis was set-up for a normally aspirated engine
I can not pull my graph from the laptop to post but I will try to describe

On the y axis of the 8X8 grid
I have values going from 18 up to 281 (Map readings)
x axis same rpm values 400- 6000
in the lower loads (map) through the rpm range I have values around the 14-14.81
in the upper ranges 131 (map and up) through all the rpm range I have values of 12.56-12.78

I still have not clarified the measurement value of the y-axis (psi,Mb,etc)
I think these values are a little better
or do you think they should be richer...like values in the 11-12.5 range

Thanks for your input

[Horsewidower]

Roberto, is it a 3bar map sensor? Looks like your values may equate to a kpa scale.

I would suggest that for initial tuning you stay under 12 for any load positions, then tune from there. You'll be richest at MBT and get a little leaner as rpm increases.

I've got 1024 cells on my 32 by 32 map. What a pain.