AutoVE questions

[BRD-PREY]

I upgraded my intake track for my upcoming stroker. I have a 4.1" outlet feeding 100mm MAF from haltech with a cartridge style LS-7 sensor. The output of the AIR box has a laminar flow screen but that didn't help. I started the car and it will barely run. If I unplug the MAF it runs significantly better but hesitates off idle. My V2 shows the MAF airflow with the MAF plugged in as fluctuating severly. If I blip the throttle I can sometimes get the engine to rev up but I see airflow with the rpm up diving down.
So, I figured I would start by getting a good SD tune.
so I'm going the follow Andys AutoVE. I had a few questions be fore I start.
1) If I'm using the LC-1 serial wideband do I need External Analog Voltage 1 PID?
2) Open calibration {C2901} “MAF High Frequency Fail 1" Set it to 1 Hz. won't this fail the MAF?
If so can't I leave it plugged in so IAT temp will read?

Thanks Ed

[joecar]

Hi Ed,

Do AutoVE first, then do AutoMAF...

Serial wideband:
anywhere that a BEN is required, use this as the new BEN: WO2BEN = {GM.EQIVRATIO}*{EXT.WO2LAM1};
(i.e. change any BEN maps to use this and save with new filename).

Shawn's Calc.VET Tutorial and Calc.MAFT Tutorial contain calc_pids.txt files that define WO2BEN
(those tutorials also show how to define WO2BEN if you have only analog wideband ability).

AutoVE:
- disable CL/LTFT,
- disable MAF (make sure MAF DTC is present),
- set PE safely rich to protect motor,
- capture log,
- create a WO2BEN map that matches B0101 (hint: copy the VE table, then in the map row/col properties click Paste Label),
- apply transient filter to map,
- paste-multiply map to B0101.

AutoMAF:
- disable CL/LTFT,
- enable MAF (make sure DTC goes away),
- set B0120 to zero to disable VE,
- set PE safely rich to protect motor,
- capture log,
- create a WO2BEN map that matches B5001 (hint: copy the MAF table, then in the map row/col properties click Paste Label),
- apply transient filter to map,
- paste-multiply map to B5001.

Shortcut: while doing AutoVE, log GM.DYNAIR, and make a B5001-like map of GM.DYNAIR multiplied by WO2BEN, filter transients, paste into B5001.

Note:
- AutoVE is a special case of Calc.VET Tutorial with CL/LTFT and MAF disabled.
- AutoMAF is a special case of Calc.MAFT Tutorial with CL/LTFT and VE disabled.
- Calc.MAFT Tutorial is aka Reverse Calc.VET Tutorial.

SELBEN:
SELBEN is a combination of LTFT and WO2BEN, but you can restrict it to only WO2BEN as long as you disable CL/LTFT.

Concept/Intent (what they do):
- Calc.VET Tutorial corrects MAF and calculates VE from corrected MAF.
- Calc.MAFT Tutorial corrects VE and calculated MAF from corrected VE.

Pay careful attention to:
- is PE safely rich to protect motor,
- is PE enabled correctly to kick in at any significant load,
- is CL/LTFT enabled/disabled,
- is MAF enabled/disabled,
- is VE enabled/disabled,
- what am I using for BEN,
- avoid using GM.AFR for anything other than display,
- keep pid channel count at 24 or less.

[BRD-PREY]

Joecar

What about this??
2) Open calibration {C2901} “MAF High Frequency Fail 1" Set it to 1 Hz. won't this fail the MAF?
If so can't I leave it plugged in so IAT temp will read?

[joecar]

Joecar

What about this??
2) Open calibration {C2901} “MAF High Frequency Fail 1" Set it to 1 Hz. won't this fail the MAF?
If so can't I leave it plugged in so IAT temp will read?

Yes, that will fail the MAF (with MAF sensor still physically plugged in), set and C2903 set to 1 to make it happen immediately...

You will know the MAF is failed when DTC P0103 shows up (in C6001 it must not be set to Not-Reported).

[Chevy366]

Joecar

What about this??
2) Open calibration {C2901} “MAF High Frequency Fail 1" Set it to 1 Hz. won't this fail the MAF?
If so can't I leave it plugged in so IAT temp will read?

I have seen some influence from leaving the MAF plugged in in past logs , it is a slight skewing at best , maybe my imagination , but I made a pig tail to jump from the plug to the IAT sensor (5 wire MAF) .

[BRD-PREY]

I'm back in town thanks for the help, just want to make sure a I'm real new at this. I have custom o/s5 is their any other changes or suggestions for the AUTOVE tutorial?
Ed

[joecar]

I'm back in town thanks for the help, just want to make sure a I'm real new at this. I have custom o/s5 is their any other changes or suggestions for the AUTOVE tutorial?
Ed

Semi Open Loop (COS feature): any cell in B3647 that is set to stoich (EQR 1.00) will cause STFT trimming to that cell.

So during AutoVE and/or AutoMAF be sure to change any B3647 cells that are 1.00 to either 0.99 or 1.01 to avoid SOL.

[BRD-PREY]

autove is coming along nicely thanks to Joecar. Wish I had some hill in FL as to get to the lower vacuum cells. So I'm getting ready to plug the new MAF in is there a way to log the MAF output while the car stays in Speed Density (open loop) I realize I can force open loop through coolant temp. but will it ignore the maf output while log it?
Ed

[Taz]

Once you are satisfied with the accuracy of your VE table (from the AutoVE) process, then tuning the MAF is the next step. Just like the AutoVE process was done in open-loop, so is the AutoMAF process. Use the open-loop settings from the previous AutoVE exercise - but return the MAF fail frequencies to the stock settings - and set B0120 to 0 RPM to force the PCM to use MAF only data, and ignore the VE table.

Your existing CALC BEN PID from the AutoVE process will work for the AutoMAF process - you just need to create a MAF type map in the Scan Tool - as described by Joecar in post #2 above.


Regards,
Taz

[joecar]

Updated post #2 fixed stupid typos.