Well, they still look slow and your getting a current DTC code for insufficient O2 switching.
They are 'working'..they just seem slow. Believe it or not, it still looks like you need to add another +10% to the MAF..
I guess you could clear the DTC's, try adding more MAF. I'm running out of ideas as to the O2's. Maybe on your type of vehicle they run slower. But, we need to see if that DTC persists..
I have a couple of concerns. First off we have added an incredible amount of Airflow to the MAF. I mean a lot. I don't know what kind of HP you are pulling down, but as an example my 430HP Camaro pulls ~ 320 g/s at 10,000 Hz (MAF) at 5400' MSL. Maybe yours need that much..but thats a lot over stock.
Since you have bigger injectors, I wonder if those Tables may not be set-up correctly. Most people actually go too rich when adding bigger injectors. But hacking the IFR Table is seriously frowned upon. You MAF and VE Table will still be jacked up. Granted you might solve one problem, but you will get all sort of weird AFR spikes when you attempt to do it via the IFR Table.
I did P.M. Joecar earlier. He is very busy, but he may get some free time to look over a few things. I have to pull a midnight shift here shortly..if I get a break overnight I will also look it over again and see if I can figure anything out.
I would make sure your Injector Tables are accurate. I'll get back to you sometime in the next 8-12 hours..You have done good work..keep it up, we will figure it out.
Later..
Paul,
You said you have 60lb/hr@43.5psi injectors...? I calculate that your IFR should be 8.72942g/s @ MANVAC=0.
Does your vehicle have a returnless FPR or a manifold-referenced FPR...?
Yes, it is return-less. I checked the fuel pressure last night running and it was 63psi. I use the Fuel Injection Program from EFI Live and it gave me the following IFR:
9.098032
9.150246
9.202164
9.253791
9.305131
9.356190
9.406972
9.457481
9.507721
9.557698
9.607414
9.656875
9.706083
9.755044
9.803759
9.852234
9.900472
When these numbers are used it goes super lean.
This is what i have in my tune currently loaded in the ecu:
8.187500
8.234375
8.281250
8.328125
8.375000
8.421875
8.468750
8.515625
8.554688
8.601563
8.648438
8.687500
8.734375
8.781250
8.828125
8.867188
8.906250
This is what I have in my tune with the latest scan, even though the IFR program is asking for higher number.
Paul
Paul:
I did not come up with any real insights overnight, but a few points to ponder.
1. Is this the stock MAF..Has it been ported or altered?
2. Are we 100% sure of the injector size and flow rate.
3. Are you still getting a current DTC on 'insufficient switching on your O2's'.
I think you need to mechanical track down that DTC. Perhaps there is still problems in the wiring or connector if the problem exists.
Thats all I got. Perhaps you and Joecar can problem-solve any inconsistencies in the published IFR rate of those injectors..
Later..
Shawn,
Yes, it is the stock MAF and is brand new. I have not modified it. I had though to change the factory one and had a new GM replacement on the shelf. I do have a Lingenfelter 100mm as well if needed.
I am positive of the injector size, i thought the same thing. I have 3 sets of the same injectors, they are Siemens Deka Injectors.
Yes, still getting the same DTC, is it possible it is setting because the truck is lean and not getting enough cross counts?
My, 2006 truck is a one owner low mileage 20k only in like new condition. It is a factory GMC v-max 6.0, the GMC version of the Silverado SS. All aftermarket parts ie. fuel, electrical, mechanical, drive-train and etc. are brand new. Only the truck itself and wiring are not new.
I do appreciate your help, I have done tuning before LT1's and other variations, just not on something this aggravating.
Would it be better to run a static fuel pressure with a return?
I guess we could still try adding an additional +10% to the entire MAF curve. That should change your LTFT's to slightly negative. If that does not change the DTC, we will have to think of something else.
I will wait for Joecar to comment on the Injector/Fuel Pressure etc,. He is the expert on that.
In summary.
1. Clear Trims Again
2. Clear the DTC through the Scan Tool
3. Add +10% to the entire MAF curve.
4. Repeat Log Run..