Good deal. Post a datalog when you can.Originally Posted by TragicMike
Good deal. Post a datalog when you can.
Well this might be embarrassing.. but sure.
Settled on this for Idle (for now)
0 0 Run with this.hpt
This is the first trip out of my neighborhood
Run with this Log 02.hpl
Overall it felt fine, but the charts don't look great.
Any input is welcome.
Overall, it looks pretty good.
Next step, before you start dialing in the MAF, is to disable the Virtual flex fuel sensor. It is notoriously inaccurate.
I've tuned vehicles that showed over 60% ethanol...that I knew had E10 in them. Just disable it for now. If you decide to run flex fuel, you can always add a sensor.
It looks like the LTFT is consistently lean at low rpm. Probably can add 5% fuel to the entire MAF curve below 7000 Hz and get it very close. At that point It won't take long for you to get it dialed in. Once I get the fuel tables dialed in, I typically disable LTFT's completely. That'll keep your WOT AF pretty consistent.
How is it running now? Looks like it just died once in that datalog. I know that Edcmat-l1 recommended 600 rpm for target idle speed, but I tune an awful lot of these combos, and that's just a little low. If you increase it another 100 rpm, it'll have a more stable idle, and certainly better engine vacuum.
You'll typically have to desensitize the misfire detection just a bit with this cam as well, otherwise you'll have a P0300 DTC. Just desensitize it below 1500 rpm and you'll be good.
Last edited by kevin87turbot; 11-27-2023 at 08:09 AM.
Oh.. that might not have been a stall.
I think it triggered one of those random misfire codes you mention and I hit the key.
I have gotten a handful of those, but otherwise it seems to run great.
Sounds like excellent advice. I will be doing some adjustments this evening.
There is probably a lot of room for improvement.. and power left to be found..
but I'm mostly trying to make sure it is stable without changing too much.
This isn't a daily driver, but it is 100% street.
Want to get it back to the owner soon, and they don't need to be doing WOT pulls anyway on a 50 mile engine. =D
Currently feel like I'm going in circles:
Long story short: I have started over about 5 times.
Initially trying to tune MAF/VVE at the same time using Cringer's methods.
I am now thinking that I need to be closer to actual values before using that method.
Many posts here refer to "having fuel dialed in first"
I'll just admit that I probably don't know what that means.
Is it injector data, or MAF Calibration that is being refered to?
And on the subject of MAF Calibration: In an ideal world, with a shiny new sensor, should the calibration just match sensor output from the scanner?
This is my current tune and a 15 minute log:
121423-6.hpt
6.hpl
Fuel dialed in means tuning the MAF and VVE. You don't want to change the injector data if they are the original injectors that came with the truck.
Dialing in the MAF means pasting the % of fueling error you are seeing in your logs to the appropriate columns of your MAF calibration chart. If your log shows it 10% lean at 8000 hz, then you need to raise that cell on your MAF calibration by 10%.
Thanks for the clarification.
That is the process I have been following, but I ended up seeing what I thought were odd results.
Especially on the VVE side. It kept wanting more and more of the same adjustments across multiple logs, resulting in some very exaggerated curves.
I think some of my issues may be torque converter related, but am still not sure at this point.
Last edited by TragicMike; 12-14-2023 at 04:04 PM.
Are you filtering data to get steady state fueling conditions? For example, a filter for no accel pedal changes within +/- 500 milliseconds?
The filters I have set are looking at Torque Mgt Advance, Throttle Position slope, and Fuel Trim Cell
I wasn't logging the torque advance or Fuel trim cell, so that probably messed things up a bit
Besides trying to get the fueling corrected, I am chasing a 1200-1600 rpm "surging" at steady throttle.
At first I thought it was the converter, but some research has shown it could be misfire detection, O2 sensors, or just bad tuning.
Most recent log/tune:
As Run.hpt
overnight log.hpl
I have updated injection timing settings. (Mostly a semi-educated guess)
Desensitized misfire detection.
Adjusted base timing tables.
Proposed changes and AsFound file for reference:
2- Proposed changes.hpt
11232023-AsFound with Trans-07Avalanche-LC9.hpt
VVE is still quite a bit off, but I used what I thought was the closest table I had.
I have now set the scanner to watch more closely for misfires and signs of knock detection.
Will post another log when I get a chance to play with it again.
On today's episode of WTF...
Engine was correctly registering misfires, but did not trip CEL
Mostly cyl 7, with a few other hits from bank 1.
Pulled the plugs and all of the gaps on driver side had shrunk to under .020 .... I'm assuming the straps got hot enough to bend down... ???
Wideband ordered.
New Narrowbands ordered.
But also... Long tubes.
So farther down the rabbit hole I go.
Still battling this thing.
New Exhaust, New Narrowbands, New Wideband.
It seems to get wonky and lose me when I try to go CL and tune MAF/VVE
Is this cam large enough that I need to worry about false rich conditions at idle?
Is that even a thing? Truck Norris 212/22X,.552/.552, 107 LSA
I'm trying to be more patient with logs and watch Inj tip temps.
I'm trying to "spray it safe" with injection timing at low rpms.
Am I in the ballpark?
115EOIT.JPG
Current VVE table looks like a mess.. but what do I know.
115vve.JPGu
Idle seems stable but it always wants to cut fuel in CL.
The only current idle log I have is missing channels. (USB problem I think)
The fuel trims are all over the place on this most recent log.
Short trip.hpl
I have experimented some with the O2 Prop airflow vs mode but I don't have a grasp on it.
Current tune:
50- flash for idle scan.hpt
Any input is welcome. Ty for reading.
Last edited by TragicMike; 01-15-2024 at 05:12 AM.
Idle Log and VVE after some tweaks:
long1 idle.hpl
115VVE2.JPG
Cannot attach full log but here is the progress.
Fingers crossed that it keeps going the right direction this time.
115Fuel trims.JPG
Update:
I think Fueling and VVE are very close.
Truck returned to owner... my friend.
I'll keep trying to dial it in closer, but probably weekly instead of daily.
vve129.JPGMAF.JPGFuel trims.JPG
Anybody want to walk me through PE Tuning with the wideband?
Or deep dive into Narrowband Oxygen Sensor settings?
Thanks for reading.
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