Doing VE with a 6.2L and Super Charger

[HellKnightHicks]

Just want to make sure I'm doing this right.

Unplugged MAF because I cant get it to disable
Set Open Loop with scanner - Couldnt get O2 Sensors to Disable
Reset LTFT's - Because the come after starting and setting open loop.
Disabled DFCO

Heres the tune I used for VE Logging and the Log No changes applied from this log.
10 VE Tuning, DFCO, Sensors.hpt### Finaly correct No MAF.hpl

[GMCfast]

Does the maf have IAT builtin? If so wont work you will go into limp mode.

Edit: I see you supercharged so I assume you have breakout harness. That's all the correct steps. Just drive around and get data and apply.

[HellKnightHicks]

Does the maf have IAT builtin? If so wont work you will go into limp mode.

Edit: I see you supercharged so I assume you have breakout harness. That's all the correct steps. Just drive around and get data and apply.

I have a beak out harness. Its post super charger.

There were some areas that were super fat and some that were very lean.

[GMCfast]

I'm guessing you have a 18? Or later? Seems to be the only ones you can't disable stft in the tune but you can in the scanner. Im guessing a new one to add to the list is you can't fail the maf. I tried yesterday and it would never give me the CEL. Unplugging it may be the only way if you have IAT broke out.

[floridanick]

zone boundaries

[HellKnightHicks]

I'm guessing you have a 18? Or later? Seems to be the only ones you can't disable stft in the tune but you can in the scanner. Im guessing a new one to add to the list is you can't fail the maf. I tried yesterday and it would never give me the CEL. Unplugging it may be the only way if you have IAT broke out.

Yea me either i unplugged it. I have a break out harness for the IAT sensor. It still doesnt fail even zeroing out the Paremeters.

Im getting the VE fairly close but these Polynomial VE's wont let you get it dead on like the olden days.

[HellKnightHicks]

I have a strange push up in the VE from the logs. Its saying around the .64 map/baro and 2600 that its lean in every log. I raised it to the point that it will blow the Coefficient calculations if I go any higher.

Attached Tune and Log with image
on22.hpl
22 VE 2 Bar Scale.hpt
62 Pressure Ratio 2600 RPM.png

My first guess would be an exhaust leak but I know theres not one. Ive looked and looked the exhaust over and listened while rolling around under the truck.

[smokeshow]

I'm betting you've been chasing your tail with this for a while. You can't calibrate the VVE with pressure ratio when baro is a learned value that isn't accounting for the blower. Notice how your baro goes up every time you get into boost? Need to address that before going any further.

Also, a good reason not to disable your MAF while doing all of this, assuming you'd want to enable closed loop: https://forum.hptuners.com/showthrea...ation-for-gen4

[Ben Charles]

Yep when the Baro sensor built into the MAF sensor sees boost (don’t have to worry about this on PD blowers) it skews the barometric pressure (basically maxes it out) which throws off the calculation..

[HellKnightHicks]

I'm betting you've been chasing your tail with this for a while. You can't calibrate the VVE with pressure ratio when baro is a learned value that isn't accounting for the blower. Notice how your baro goes up every time you get into boost? Need to address that before going any further.

Also, a good reason not to disable your MAF while doing all of this, assuming you'd want to enable closed loop: https://forum.hptuners.com/showthrea...ation-for-gen4

Yup 24 log and tunes..... Was awesome...

[pisces_0]

I'm betting you've been chasing your tail with this for a while. You can't calibrate the VVE with pressure ratio when baro is a learned value that isn't accounting for the blower. Notice how your baro goes up every time you get into boost? Need to address that before going any further.

Also, a good reason not to disable your MAF while doing all of this, assuming you'd want to enable closed loop: https://forum.hptuners.com/showthrea...ation-for-gen4

Getting my head wrapped around the histogram and filtering when logging GMVE STFT error.

You mention disabling LTFT. When doing this on a Gen V, does STFT remain active or is closed loop disabled altogether?

[smokeshow]

Getting my head wrapped around the histogram and filtering when logging GMVE STFT error.

You mention disabling LTFT. When doing this on a Gen V, does STFT remain active or is closed loop disabled altogether?

You still want closed loop enabled. That's what provides the fueling feedback in the math.

[pisces_0]

You still want closed loop enabled. That's what provides the fueling feedback in the math.

Thank you for the quick response.

Just have to filter out transients now...

[HellKnightHicks]

I got a break out harness and have moved the baro out of the intake tube.

Got some more parts coming in in the next week to redo most of the piping.