Looking for some pointers on maf tuning.

[swingtan]

CFCO should be disabled full stop.....


If you don't mind the slight rich spike you get on the gear change, you get a smoother change disabling CFCO. The only time I've turned t on is when I was playing with open throttle shifting ( which worked well for racing, not so much for daily driving ).

You can always filter the log data if you don't want to turn it off, but it's better to.

[TJWells]

ok
I logged some data with maf turned on. no cl/stft/ltft/dfco/cfco. After filtering, I have a few .9 areas @73kPA and up as well as 15-31. How do I corrolate. B1097,B1098 to my log. I believe I need to lower these numbers but how much and where.
I think I logged the wrong data. If so what should I log?

[joecar]

Create 2 maps that look identical to B1097 and B1098...

do this like so:
- in tunetool, for each of B1097 and B1098 one at a time, do copy-with-labels,
- in scantool, create a new map (name it according to the table it maps),
- on Row and Col tabs do Paste Labels (this will dimension the map to match the table),
- on Data tab choose CALC.WO2BEN (see note below),
- on Data tab set Precision to 3 or 4,
- on Data, Row, Col tabs checkmark Show Units,
- on Cell tab checkmark Constrain Size,
- save the map,
- repeat for the other map;

note: since you have CL/LTFT/STFT disabled, you will be using CALC.WO2BEN as the correction factor (and ignore both CALC.LTFTBEN and CALC.SELBEN).


Then, you take some logs, you look at both maps, you apply the low cell count filter and the transient filter, then for each map you copy the whole map and do paste-with-labels into the table it maps (B1097 or B1098), do this for both tables (with their respective maps).

[TJWells]

- on Data tab choose CALC.WO2BEN
Joe this is giving me some trouble. I can't find it. Even if I uncheck selected. I selected Base Efficiency Numerator lc-1 e38 style (factor). Is this right?
I have also added the calc pid to my bbx logging.


CALC.WO2BEN as the correction factor (and ignore both CALC.LTFTBEN and CALC.SELBEN).
Ok I was feeling like I learned something, now I think I missed the last semester.
CALC.W02BEN as the correction factor? Totally lost.
CALC.LTFTBEN and CALC.SELBEN never used them to even know to ignore them.
Man do I fell stupid right now.

[TJWells]

Morning Joe!
I found that if I checked the names box I could find the correct pids. Went to my cal.pids text and figured out the rest.
I am now confident that I have the maps set up properly. Can you direct me to information on defining calc.pids versus other types of pids? right now I'm following direction, but would like to understand better. I believe I understand the theory of CALC.WO2BEN as the correction factor. But i'd like to be informed.

[joecar]

Hi TJW,

BEN is measured Lambda divided by commanded Lambda

[ noting that EQR = 1/Lambda as some OS's provide EQR rather than Lambda (or vice-versa) ]
[ noting that AFR = Lambda*StoichAFR ]

WO2BEN definitions for various ECMs:
LS1: CALC.WO2BEN = "{EXT.WO2LAM1}*{GM.EQIVRATIO}"
E38: CALC.WO2BEN = "{EXT.WO2LAM1}/{SAE.LAMBDA}"
else: CALC.WO2BEN = "{EXT.WO2LAM1}/({GM.AFR}/14.63)"

is that what you're using for E38 (the second one)...?

example:
say measured lambda was 0.9 and commanded lambda was 1.0,
this means that measured lambda indicates combustion is richer than what was commanded,
the BEN factor is 0.9/1.0 = 0.9
so to correct the difference between measured and commanded Lambdas, the table sourcing the airmass calculation has to be multiplied by 0.9.

[joecar]

There's a section in the scantool user manual pdf regarding calc pids.

[TJWells]

is that what you're using for E38 (the second one)...?

Where would I check to see if this is what I'm using? In the CALC.PIDS text file or when I pick the pid to log or somewhere else even?

[joecar]

is that what you're using for E38 (the second one)...?

Where would I check to see if this is what I'm using? In the CALC.PIDS text file or when I pick the pid to log or somewhere else even?

In the scantool, on the PIDs tab, on the pid CALC.WO2BEN do rightclick->More Info and see what it says...

also, look in your calc_pids.txt file, look at how the CLC is defined for CALC.WO2BEN.

[joecar]

Post your calc_pids.txt file here so I can look at it (sanity check).