Calc.VET: correcting MAF and calculating VE (in single log)

[Gregs]

Ok that makes sense, thanks!

[Gregs]

I used this method the other day and it worked great logging from my laptop. Yesterday I did a black box log and now when i go in and add the calculated pids to the list its saying that SELBEN and VEN are invalid. Its weird because in my other log with my laptop they are valid.

[joecar]

On the PIDs tab, on the invalid pid do rightclick>More Info, this will explains why he pid is invalid (it might need other pids to be selected).

Paste the More Info text for those pids here (highlight the text and do ctrl-C to copy it).

[Laychut]

Hi, this may be a stupid question, but what does BEN stand for? I see it used a lot through tis posting.

[joecar]

BEN is a contrived term, Base Efficiency Numerator, also named after Ben Strader of EFI University.

it is easier to say/write "BEN" than it is to say "wideband fueling correction multiplier".

BEN is equal to all of these:
- commanded EQR * measured Lambda
- commanded EQR / measured EQR
- measured Lambda / commanded Lambda
- measured AFR / commanded AFR (if both commanded and measured assume the same value for stoichiometric AFR).

[Laychut]

Thanks Joecar!
So when I see words like selben or WO2ben it is all to do with data/information from the wide band O2 sensor?

[Laychut]

Also I have a stock LS1 out of a VZ Calais in my landcrusier. The information I got from the Marks4wd adaptor site suggested that I should run my rail pressure @ 65psi. The holden work shop manual says that the pressure as standard is 59psi. Should I lower my pressure down to 59psi and keep the stock fuel injector settings or keep it at 65psi and change the fuel rail pressure setting using the excel sheet mentioned in this post?

I am gearing up to carry out the Calc Vet tuning on my engine so I am trying clear up a few questions I have before I hit the road logging.

Another thing, I hear about open loop with MAF. How do I set up for that? I want to keep my MAF at this stage, but do I have to be in open loop for the Calc Vet tuning to work? I am only new at this tuning and I am trying to get this clear in my head.

Cheers

[Gregs]

On the PIDs tab, on the invalid pid do rightclick>More Info, this will explains why he pid is invalid (it might need other pids to be selected).

Paste the More Info text for those pids here (highlight the text and do ctrl-C to copy it).

Calculated VE, Not corrected {CALC.VEN}

Expression:
% = {SAE.MAF.gps}*({GM.DYNAIRTMP_DMA.C}+273.15)/{SAE.RPM}/{SAE.MAP.kPa}*3445.2/displacement()
is NOT valid because:
Required parameter {SAE.MAF.gps}, at position 14 is not selected.

PID value cannot be determined because
the following error would occur:
Expression not valid: Required parameter {SAE.MAF.gps}, at position 14 is not selected.

Calculated VE, Not corrected {CALC.VEN}

Expression:
g*K/kPa = {SAE.MAF.gps}*({GM.DYNAIRTMP_DMA.C}+273.15)/{SAE.RPM}/{SAE.MAP.kPa}*15
is NOT valid because:

PID value cannot be determined because
the following error would occur:
Expression not compiled





so i logged gm.maf not sae.maf. Is there any difference in these pids? It's kinda hard to know exactly which pid you're selected in the v8 interface because it doesn't list gm.maf it lists "Air Flow Rate from Mass Air Flow Sensor" so there's no telling exactly what you're selected

[joecar]

SAE.MAF = PCM reports what MAF says, even when MAF has failed.

GM.MAF = PCM reports what MAF says, but when MAF fails the PCM reports calculated MAF (i.e. what it should say based on calculation from VE, MAP, RPM, DAT).


See post #2 here: Summary-Notes

[Gregs]

SAE.MAF = PCM reports what MAF says, even when MAF has failed.

GM.MAF = PCM reports what MAF says, but when MAF fails the PCM reports calculated MAF (i.e. what it should say based on calculation from VE, MAP, RPM, DAT).


See post #2 here: Summary-Notes

very helpful, i've got that thread bookmarked now

how would you describe the differences between GM.DYNCYLAIR and GM.DYNCYLAIR_DMA?

GM.DYNCYLAIR
PCM calculated cylinder airmass [g/cyl] based on VE.

GM.DYNCYLAIR_DMA
Internal PCM calculated cylinder airmass [g/cyl] based on VE.