Looking at the upper one, at ~875, the boost falls BEFORE the fuel is removed.
Odd. Lots of RPM scatter as well.
Odd. Lots of RPM scatter as well.
LLY: my truck's weird issues...revisited...again
- Thread starter duratothemax
- Start date
Log maximum engine torque.
I got your PM Ben :hug:
Ben, Base torque and TLIQ is used full time , not just when a shift is commanded , it is master fueling table , when a shift happens it just uses another cell in the same table . If you put a cap on TLIQ ( 500nm-1000nm range ) of 90 mm3 the truck will never fuel above 90 mm3 period no matter what your other limiter tables request.
There is a table missing on were the ECM receives its requested torque from IMOP, some of it comes from the TCM based from TPS ( B5196 ) but not all of it from what i have found. But it doesn't matter, because with our other tools we don't need to control the torque request, it is merely a fueling reference anyway , so using TLIQ and base torque we have full control of it. this is just to scratch the surface and would like to see those logs and tunes still , or you can call me for a more in depth explanation.
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Prime example , go power brake your truck while logging it , I guarantee no matter what you change in any limmiter table( besides base torque and TLIQ) you can not hit 100 MM3 you might hit 60-70 mm3 , and not until 2600-2700 will you get close to full fuel . it can be made to do it but has to be done carefully or else poor shifts will be the result ...............
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trent i cant seem to find b5196. it just says table not found. this is a little off topic but are you using base tq. table to control defuel for shifts. such as decreasing tq at the point of shift
I give about 80% of everything I do or have leared to the public to help with others building there trucks , That info is the in the 20%
and some of it isnt mine to share, Sorry I was refering to D5196, its in the TCM .
Does your's have the same problem?
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How did you fix it?
I didn't. It was a tuning issue (obviously), and since I do not tune the pullin truck I can't honestly tell you what it was. I do know what I was told though, and it was definitely airflow related.
What I found odd about it though, was it would not de-fuel below about ~3100 rpm's. I would have thought if it was simply airflow it would be at varying RPM's....
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There is nothing that we can't fix that is rpm( -5000) related with EFI
If this is true, (which I am not saying it isn't) why can't anyone fix Ben's issue?
And why do so many people complain about llys and weird de-fuel issues?
Driver demanded torque? Is that like you pushing on the pedal? TBIQ starts to drop at 3100 but not to 60 like your truck. Looking at your MAF logs, it doesnt look like a problem, you could always Increase B0201 by 100% to rule that out.
. Looking at your MAF logs, it doesnt look like a problem, you could always Increase B0201 by 100% to rule that out.
Havent been able to work on my truck at all; ive been too busy with customers trucks and stuff here.
I have a completely stock tune in my truck and I it will still defuel and randomly fall on its face at higher RPM's.
Yes, I have twins. The only thing this effects is airflow (or MAF). The truck doesnt throw any overboost codes or anything (remember, this is a stock tune, all DTC's are enabled), it JUST DEFUELS!!
It throws EGR codes and thats it. But it still defuels. Someone tell me there is not some other hidden airflow-related limiter/defuel table....
(im not talking about B0751/0752, thats to control LOW BOOST fueling and limit smoke before turbo spool up)
I have a completely stock tune in my truck and I it will still defuel and randomly fall on its face at higher RPM's.
Yes, I have twins. The only thing this effects is airflow (or MAF). The truck doesnt throw any overboost codes or anything (remember, this is a stock tune, all DTC's are enabled), it JUST DEFUELS!!
It throws EGR codes and thats it. But it still defuels. Someone tell me there is not some other hidden airflow-related limiter/defuel table....
(im not talking about B0751/0752, thats to control LOW BOOST fueling and limit smoke before turbo spool up)
Im not saying this cant be worked around by careful base torque/TLIQ table manipulation.........but there IS something we are not seeing.
Ben, the thing is, you don't have a stock truck... not even close... so a stock tune is likely NOT going to work like it did a few years ago when you DID have stock parts. The different intake piping likely changed the airflow characteristics and probably threw off the MAF curve, you don't have a VNT any more (right?) so that's going to change how the ECM will try to run the motor, you've lowered the compression, have larger nozzles (I think...)....
On my truck, I could go back to a stock tune to troubleshoot wierd issues (and have to try to troublehoot my ANNOYING 2-3 & 4-5 flairs) since it's stock except for the built trans and modded regulator (for now).... Yours, not so much.... Just my $.02 :hug:
On my truck, I could go back to a stock tune to troubleshoot wierd issues (and have to try to troublehoot my ANNOYING 2-3 & 4-5 flairs) since it's stock except for the built trans and modded regulator (for now).... Yours, not so much.... Just my $.02 :hug:
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Forgive me but I don't think I understand what your saying. Are you saying the ecm will pull fuel if it doesn't see the maf maxed out at 66.14 lbs of air a minute? Or that it will pull fuel if it does see the maf maxed out at 66.14 lbs a minute?
Thanks.
The ECM limits fuel based on the measured airflow in order to maintain the proper air/fuel ratio (Yes, this does apply to a diesel) to prevent smoke.
What Ben is trying to tell us is that there is another airflow table somewhere in the ECM that has not been retrieved and decoded by the crew at EFI Live. I am thinking something along the lines of "airflow torque limit" I'm thinking that if this table exists perhaps it falls off at higher RPM similer to some of the other "stock" tables in the ECM...Now this can be worked around using the torque tables much like using the MAF voltage table in lue of the other MAF tables being present in the newer ECM's. Ben, have you talked to the folks at EFI to see if they'd be willing to look for this possible table?
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