Evolution of a AutoVE Tune

[kwhiteside]

I'm driving home AutoMAF, instead of AutoVE. MAF enabled, b0120 set to 400, b3801 disabled, MAFFREQ added to my BBL PID's. I'm actually quite scared to do it, but am going to give it a try. I'm sure I'll be starting an new thread later this evening.

[edwardzracing]

Open Loop tuning on the streets sucks.
You can log, filter, paste and smooth all you want but {B0101}
will not be consistent at all temperatures, altitude and even load in OLSD.
You can get a general shape for the VE table this way then enable LTFTs
and tune with them for non PE areas.
When PE is on and LTFTs are 0%, you can use WBO2 to adjust the WOT areas.
No smoothing has been done to this VE table and LTFTs are between 0% and -3%

Not trying to highjack the thread, I just wanted to ask mr. prick a quick question. Do you have any links or could you maybe send me a message on tuning with LTFT's? You make mention of it in this post, and I thought I'd ask for some guidance or advice. Would I be able to use the map included with EFILive entitled {B0101} Main VE - LTFT Bank 1.map? Then make changes as needed after doing an AutoVE and then re-enabling LTFT's? Any help would be appreciated. Thanks.
/end highjack.

[WeathermanShawn]

Depending on your modifications 'AutoMAF' may work out pretty good. You might have some fueling problems at idle. If you have any cam (other than stock), the overlap at idle can cause 'reversion' and both your wideband and narrowband O2 sensors will not be accurate.

For the other poster on LTFT's. Sometimes mapping them becomes easier if you change all of the narrowband O2 switch-points (B4105) to say 500mv.

[mr.prick]

Assuming your exhaust has no leaks and WBO2 is configured/working properly:
1. Set up Closed Loop Speed Density (no DFCO or catalytic converter protection)
2. Set the O2 switch point {B4105} to 450.0mV
3. DO NOT DISABLE PE

Create CALC.PID

#Units    Low    High   Fmt    Expression
#------------ ------ ------ ---- -------------------------------------------
*CLC-00-010
factor        0.0     1.4    0.2  "({SAE.LONGFT1}+{SAE.LONGFT2})/2/100+1"

#Code              PRN  SLOT         Units     System     Description
#---------------- ---- ------------ --------- ---------- -------------------
CALC.LTFTBEN      F010 CLC-00-010    factor    O2-Wide    "LTFT BEN" 

Log PIDs (minimum)
CALC.LTFTBEN
GM.AFR
GM.DYNCYLAIR_DMA
GM.KR
SAE.ECT
SAE.IAT
SAE.LONGFT1
SAE.LONGFT2
SAE.MAP
SAE.RPM
SAE.SPARKADV
SAE.TP
Add relevant WBO2 PIDs ect.

Filters.txt
Exclude data frames
SAE.TP.% changing more than 5% 100ms OR
GM.AFR.:1 is less than 14.6{B3601} OR
SAE.ECT.F is less than 180°F

Paste LTFTBEN to {B0101}

Enable the edit mask and shield the cells changed by LTFTBEN.

Then for WOT/PE mode Exclude data frames
SAE.TP.% changing more than 5% 100ms OR
GM.AFR.:1 is greater than 14.6 (a little under {B3601}) OR
CALC.LTFTBEN is not equal to 1.00 OR
SAE.ECT.F is less than 180°F
Paste BEN to {B0101}

Reflash and reset LTFTs.

Tuning with LTFTs will take a little more time because a higher cell count
is needed for the PCM to learn LTFTs.

*Average LTFT PID

#Units       Low   High  Fmt  Expression
#---------- ----- ------ ---- ----------------------------
*CLC-00-004
%           -100   99.22  0.2  "({SAE.LONGFT1}+{SAE.LONGFT2})/2"
# ============================================================
#Code              PRN  SLOT     Units   System        Description
#------------- -------- --------- ----- ---------- ----------------
CALC.LTFT         F004 CLC-00-004    %   Fuel      "LTFT Average" 

[The Alchemist]

Thats a great effort for a Auto VE tune done on the road. Well done mate!!

Mike

Well my VE table isn't as nice as your but after about 6 logs and tweaks, my AFR and commanded are dead on, and my Ben/Map barely recommends any changes to my VE table. This is what I ended up with, and I've turned the MAF back on. I'll have to figure out how to tune that now!



Oh, BTW, when doing street logging. I've discovered that during low volume traffic, you can find some good on ramps that have about the same function as a 1/4 mile dragstrip. Get off and on the highway a few times and you have some really nice full throttle red line logs!

[mr.prick]

This looks suspiciously like a stock C5 ZO6 VE.

[nevinsb]

I would agree, STFT tuning is the way to go, maybe after 1 round of wideband AutoVE to whack it into shape.

[joecar]

This looks suspiciously like a stock C5 ZO6 VE.

He did start with a stock Z06 file... if you look closely you will see there are some differences... his mods are intake/headers.

[kwhiteside]

Assuming your exhaust has no leaks and WBO2 is configured/working properly:
1. Set up Closed Loop Speed Density (no DFCO)
2. Set the O2 switch point {B4105} to 450.0mV
3. DO NOT DISABLE PE

Create CALC.PID

#Units         Low    High   Fmt    Expression
#------------ ------ ------ ---- ---------------------------------------------------------------------------
*CLC-00-010
factor        0.0     1.4    0.2  "({SAE.LONGFT1}+{SAE.LONGFT2})/2/100+1"

#Code              PRN  SLOT         Units     System     Description
#---------------- ---- ------------ --------- ---------- -------------
CALC.LTFTBEN      F010 CLC-00-010    factor    O2-Wide    "LTFT BEN" 

Log PIDs (minimum)
CALC.LTFTBEN
GM.AFR
GM.DYNCYLAIR_DMA
GM.KR
SAE.ECT
SAE.IAT
SAE.LONGFT1
SAE.LONGFT2
SAE.MAP
SAE.RPM
SAE.SPARKADV
SAE.TP
Add relevant WBO2 PIDs

Filter out:
SAE.TP.% changing more than 5% 100ms OR
GM.AFR.:1 is less than {B3601}

Paste LTFTBEN to {B0101}

Enable the edit mask and shield the cells changed by LTFTBEN.

Then for WOT/PE mode filter out:
SAE.TP.% changing more than 5% 100ms OR
GM.AFR.:1 is greater than 14.62 or just under {B3601} OR
CALC.LTFTBEN is not equal to 1.00
Paste BEN to {B0101}

Reflash and retset LTFTs.

Notes:
1. Tuning with LTFTs will take a little more time because a higher cell count
is need for the PCM to learn LTFTs.
2. LTFTs between 0% and -5% are the target but 0% to -3% is obtainable.
3. Don't alter cells where average LTFTs* are between 0% to -3%.
4. You want LTFTs to be 0% or negative before entering PE.

Average LTFT PID

#Units             Low          High      Fmt  Expression
#----------   ------------- ------------- ---- ----------------------------
*CLC-00-004
%        -100        99.22       0.2    "({SAE.LONGFT1}+{SAE.LONGFT2})/2"
# ============================================================
#Code              PRN  SLOT     Units            System        Description
#------------- -------- --------- ----- ------------------ ----------------
CALC.LTFT         F004 CLC-00-004    %        Fuel             "LTFT Average" 

First off let me say, yet another completely new concept (Tuning by LTFT). Every time you guys speak its something new. Thanks for the continual enlightenment.

That said and having recently learned the the main VE table only takes you to 4k in real life, the VE table will not be very important at the track, but will be important around town. So if I'm running ok in VE mode around town without my MAF ( and I was running awesome ), why bother tweaking it more with the LTFT?

My main goal is running strong and safe at the track, which is mostly high rpm, doesn't that make what my MAF does most important to me?

BTW, I have not done any AutoMAF runs yet as I hit a wall with my ignition switch and had to refurbish it. Hopefully I'll be good to start again tonight after I put my dash and console back together. The contact points were all burned up inside and causing starting problems and the car actually shut off Fri on the way home.