Help tuning out AFM?

[horsehaulin]

Just got the wife a Envoy XL Denali and I want to tune the AFM out so it doesn't drone in the city with its new exhaust. Anyone able to help me out?

[horsehaulin]

Ok, pulled the ECM tune and what in the Sam Houston did I just get myself into? Beginning to miss my Duramax and the old Suburban! I was not much of a gas tuner, I fiddled with a 2002 Suburban's 5.3 and hit a home run right off the bat with some chance guessing and changes, but this engine is a whole new animal. Any help you guys could offer or advice would be great.

[horsehaulin]

So, here's what I'm looking to do with the wife's speedy grocery getter. I want to disable AFM, which I think I can do by just disabling it, am I correct? Then I want to try to increase its overall power a little, get it ready for a set of E fans and also setup another tune for all out fuel economy for when I go on vacation.

What kind of knowledge can you bestow on this ole diesel guy gone gasser?

[joecar]

AFM is disabled by replacing the valley cover with an AFM/DOD-delete valley cover (it seals off the solenoid spaces).

[horsehaulin]

Can it be disabled in the tuning so it doesn't activate? I want to keep the hard parts for long drives, just disable it in town.

[joecar]

Post your tune file.

[horsehaulin]

Crap, I'm on my phone too buddy. I did see a spot while playing half asleep last night in a DOD? Is that AFM? If so, it has a Enable/Disable section. If disable shuts it down, then I'm good to hook.

And I am trying to help the 2500HD guy track down the real issue, since those bigger trucks are my old forte, as a former admin at Dieselplace.

[joecar]

Crap, I'm on my phone too buddy. I did see a spot while playing half asleep last night in a DOD? Is that AFM? If so, it has a Enable/Disable section. If disable shuts it down, then I'm good to hook.

And I am trying to help the 2500HD guy track down the real issue, since those bigger trucks are my old forte, as a former admin at Dieselplace.
That would be it.

[horsehaulin]

That would be it.

Thank you sir.

Now to tune a little city performance into it and then install an intake. Maybe build on top of the DOD/AFM for this summers vacation and attempt better fuel economy than it already gets.

[joecar]

Post the tune file anyway, please, I want to take a closer look

[horsehaulin]

It'll be quite a while, I'm on the road with my log truck, be back in later this afternoon for my youngest daughters birthday. Post it up afterward.

[joecar]

No worries, take your time.


Happy Birthday to your kid :cheers:

[minytrker]

Unless your driving somewhere really flat and slow DOD isn't going to help on mileage. Here with 75mph speed limits (so I drive 80-85mph) and hills it never kicks in. I can get better mileage turning it off and doing a good tune than leaving it on. Plus every vehicle I own that has DOD I had a lifter fail so I deleted the actual parts now vs in ecm only.

[horsehaulin]

Being new to these engines and how they work, what causes a lifter to fail? I'm not familiar with the internals of a DOD/AFM engine.

[horsehaulin]

Joecar, it won't let me send you the file or post it. It may be sleep deprivation since I just pulled my second 20 hour day in a row.

[minytrker]

Being new to these engines and how they work, what causes a lifter to fail? I'm not familiar with the internals of a DOD/AFM engine.

Crappy design. The DOD lifters do not have very much travel in them since the part that collapses takes up 3/4 of the lifter length.

[horsehaulin]

Can the same or better fuel economy be achieved with DOD/AFM disabled and the parts removed? I want longevity and economy, but I do want this thing to be Mommas little sleeper too. I already cut the muffler and resonator out, I still need to install a tube resonator for drone issues and some Dynomat. I know I need to install an intake to free up the other end still.

Can I set up two tunes, one for a majority of our driving which is 80% city with some added power and then another for those vacation drives. Lord it would've been nice to have a DSP2 switch, LOL!

[horsehaulin]

21134
No worries, take your time.


Happy Birthday to your kid :cheers: Sorry its taken me so long to upload this but things were going on with the vehicle that needed to be addressed first and now that I have dealt with those issues both vehicular and family, its time to work on this tune and make this thing the way it should've been from the factory and better.

[joecar]

No worries... l'll take a look later when I get home.

~ posted by phone ~

[horsehaulin]

Just let me know what you think I should do when you have time.

[joecar]

Ok, I see DOD is disabled in B0921.

Some thing is wrong with VE table B0200.

HO/LO spark timing tables do not have sufficient advance.

[horsehaulin]

what would you recommend I do to correct the issue and could this be cause by the end not being updated by the dealer?

[joecar]

Do you have the stock tune file from your vehicle (or one exactly like it)...?

[horsehaulin]

That is the stock tune, only turned off DoD.

[horsehaulin]

I named it Mod so I wouldn't mistakenly modify my stock tune and not have a reference point to restart from.

[joecar]

Stock tune VE table is not right.

Are you running MAF...?

~ posted by phone ~

[horsehaulin]

It has a MAF but I haven't changed anything in any of the tables except DoD turned off.

[horsehaulin]

It would seem I need a stock 2006 Trailblazer/Envoy 5.3L tune to get this thing right. Anyone know where I can find one since I can't seem to locate the Holden Tune Repository?

[horsehaulin]

I just found the Drop Box from our good members here, I'll go through the tunes and see if one matches up.

[horsehaulin]

Well that wasn't helpful as I thought it would be. The tune on file has the same OS and calibration that I have in my wifes truck. Anywhere else I can look for a stock tune for this engine that may be updated a little more than this one is?

[joecar]

Take a log of the following pids:
RPM
MAF g/s
MAP kPa
EQIVRATIO or LAMBDA
LONGFT1,2
SHRTFT1,2
IAT
ECT
DYNAIR
DYNCYLAIR
SPARKADV
KR


~ posted by phone ~

[joecar]

Also, do you have a wideband, if so which one...?

~ posted by phone ~

[horsehaulin]

No Wideband but I will make a few logs tomorrow evening.

[horsehaulin]

Take a log of the following pids:
RPM
MAF g/s
MAP kPa
EQIVRATIO or LAMBDA
LONGFT1,2
SHRTFT1,2
IAT
ECT
DYNAIR
DYNCYLAIR
SPARKADV
KR


~ posted by phone ~
Should I drive during the log and if so how would you recommend I drive it for the log?

[horsehaulin]

Ok, I went and logged about 21 minutes of driving and some park running. Since my injury, I'm not able to read this the same and make adjustments and its frustrating me that I no longer know what I am looking at. At this point I am at the mercy of Joe and the group here to help me out before I spend the money to have this tuned by someone.

Here is the log.
21158

Thanks for any help you guys can give me. I will be sure to add this tune to the new DropBox that someone is hosting here on the site.

[joecar]

I'll look at your logs and I'll guide you along.

I hope you're ok.



~ posted by phone ~

[joecar]

The idea is this:
- filter out throttle transients (which also eliminates VE),
- make a ltft map to correct the MAF,
- retest.


~ posted by phone ~

[joecar]

We can then calculate VE from the MAF.

~ posted by phone ~

[horsehaulin]

I'm better but my memory and some knowledge is lost due to a head injury. Nothing like learning things you never wanted to forget and remembering the worthless shit.

[joecar]

Ok, do this:
1. look at table B5001, hightlight the whole table, go rightclick->copy-with-labels,
2. goto scantool, goto a map letter tab, edit the map properties, on each of the Row and Col tabs click Paste Labels (do this in rapid succession, don't do anything else in between),
3. on the Row tab select the MAFFREQ pid, on the Col tab select any pid,
4. on the Data tab select the LONGFT1 pid (for now),

see if you can get a LTFT map populated from your log.

~ posted by phone ~

[horsehaulin]

I've been all over my tunes and can not find a B5001 in this engine or trans. Am I missing something?

And yes, I used the search bar, then went to manual exploration.

[joecar]

Ah, I'm sorry, that was my mistake, my apologies... B5001 is MAF table for Gen III... the MAF tables for Gen IV are B1098 or B1099.

[horsehaulin]

Ah, I'm sorry, that was my mistake, my apologies... B5001 is MAF table for Gen III... the MAF tables for Gen IV are B1098 or B1099.
I'm just glad I wasn't overlooking it, thanks for all the help you are giving me!

[joecar]

No problem... I've got many things going on at once, but I'll check the forum at least once a day.

[horsehaulin]

I have until July 6th to get this thing a few MPG's, so no worries.

[horsehaulin]

It's only populating the 1000 tab with 12894, nothing else will fill in.

I'm not sure I know what I'm doing right or wrong here.

[horsehaulin]

I also have two MAF Frequency Conversion tables, Low Flow and High Flow.

[joecar]

It's only populating the 1000 tab with 12894, nothing else will fill in.

I'm not sure I know what I'm doing right or wrong here.
Post a screenshot, log file, current tune, current calc_pids.txt.

[joecar]

I also have two MAF Frequency Conversion tables, Low Flow and High Flow.You can do both a once (but it is harder to do the High Flow table without a wideband), you can either create 2 maps or 1 large map.

[horsehaulin]

21237212382123921240
Post a screenshot, log file, current tune, current calc_pids.txt. Hopefully this is what you were asking for. Please tell me what I am doing wrong. All your help is greatly appreciated and sorry for it taking so long to reply, Ive had a few bad days these last couple of weeks.

[joecar]

In the map properties, on the Rows tab, select MAFFREQ or MAFFREQ2 rather than MAF...

this implies that you have to log MAFFREQ or MAFFREQ2, whichever one works on your ECM.

[joecar]

Also (not related):
- if you have drive-by-wire then log GM.ETCTP rather than GM.TP.
- drop the pid GM.EQIVRATIO since it does not work.
- the pid SAE.LAMBDA is producing EQR (i.e. it's doing what GM.EQIVRATIO should have done)... so we'll have to factor this in to the BEN pid (when you use a wideband).

[horsehaulin]

Ok, got the pids working and going to go log here shortly.

[horsehaulin]

I got something to populate.

21243

[horsehaulin]

Hope that's what I was needing to get done.

[joecar]

In the map properties, goto the Cell tab and constrain the cell size.

~ posted by phone ~

[joecar]

And on the map toolbar click x-bar.

~ posted by phone ~

[joecar]

Post log file.

~ posted by phone ~

[horsehaulin]

21246 Here is the screen shot.

21247

21248 Tune and Log file.

[joecar]

That looks like a reasonable STFT map:


21246 Here is the screen shot.

. . .

[joecar]

Now if you wanted a STFTBEN you would define a suitable calc pid (if you don't already have one)...

for example, any one of these (take your pick):

1+{GM.SHRTFT1}/100

1+{GM.SHFTFT2}/100

1+({GM.SHRTFT1}+{GM.SHRTFT2})/200


any one of those ^ give you a BEN correction multiplier... you would make a map with this pid on the Data tab.