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

[joecar]

Oh, I forgot that you might be logging wideband via AC pressure sensor or EGR position sensor...

if this is so then we can create a wideband AFR/lambda pid using the EGR voltage...

you might have to enable EGR in the tunefile.

[TunasTwins]

That sounds great Joecar. That would seal the deal with my setup. This is on my wifes 05 4.8LTahoe. i'd like to add to the thread for everyone. Ill post a log soon. Even a scan only V1 would be deluxe!

[TunasTwins]

I made the suggested changes Joecar. My "units" look off by quite a bit. The VE table values are very low; seeing 55 should be 125. Also, the MAF table has some larger than anticipated adjustments at 2750Mhz. I do have B0120 set around 3500RPM and my B3616 and B3618 are still in street trim. WO2LAM1 is also invalid. How do I get around this with my setup? THANKS for all the help guys!!

[joecar]

I made the suggested changes Joecar. My "units" look off by quite a bit. The VE table values are very low; seeing 55 should be 125. Also, the MAF table has some larger than anticipated adjustments at 2750Mhz. I do have B0120 set around 3500RPM and my B3616 and B3618 are still in street trim. WO2LAM1 is also invalid. How do I get around this with my setup? THANKS for all the help guys!!

Hi Josh,

Since you don't have a wideband, you will need to use LTFTBEN for correcting the MAF table and calculating the VE table...

use the attached calc_pids.txt file...

( you will only be able to tune Closed Loop, you will then have to extrapolate the delta to the other regions of MAF and VE until you get a wideband )

Make sure your OS supports the pid GM.DYNAIRTMP_DMA... if not, let me know and I'll modify your calc_pid.txt.



WO2LAM1 is only valid if you have a wideband connected to FlashScan V2 using a serial comms cable.

[joecar]

Set B3618 to something like EQR 1.175 all across, and set B3616 to something like 2002 Camaro (65% TP below 3200 rpm, 35% TP above 3200 rpm).

You can leave B0120 as is (because with the Calc.VET procedure, the transient filter happens to filter out VE contribution).

[TunasTwins]

Giving it a shot now. Thanks Joecar! If I go the Ac pressure route, I'll take the help on setting it up.

[TunasTwins]

Should I have the SELBEN in the new calc.pid without the
*CLC-00-220 factor 0.5 1.5 .4 "iff({CALC.CL}, {CALC.LTFTBEN}, ""{CALC.WO2BEN})""
CALC.WO2BEN entry? If not, just use the BEN from LTFT for my MAF table?

[TunasTwins]

Using the BEN from LTFT for the MAF gives sane values. I hooked up my LM-1 again! I am currently messing with the NB simulation output. I have a harness in the car that I ran a couple years ago. The car runs fine (CL) with my current settings and shows .85-.87 lambda when in PE. I need to run the 5v signal to the AC or EGR now.

[joecar]

Should I have the SELBEN in the new calc.pid without the
*CLC-00-220 factor 0.5 1.5 .4 "iff({CALC.CL}, {CALC.LTFTBEN}, ""{CALC.WO2BEN})""
CALC.WO2BEN entry? If not, just use the BEN from LTFT for my MAF table?

Use the calc_pid.txt file from post #484 (it replaces SELBEN with LTFTBEN)(and it deletes CLC-00-220 and CLC-00-110).

[joecar]

Using the BEN from LTFT for the MAF gives sane values. I hooked up my LM-1 again! I am currently messing with the NB simulation output. I have a harness in the car that I ran a couple years ago. The car runs fine (CL) with my current settings and shows .85-.87 lambda when in PE. I need to run the 5v signal to the AC or EGR now.

Wwhen you're able to get a wideband signal from your LM-1 into your AC pressure sensor signal, we'll edit the calc_pids.txt to use it.