2001 Camaro SS, LS3 Swap, Lean at WOT only!

[camaross340]

Specs:
2001 Camaro SS
6.2L L9H (from 09 escalade)
LS3 intake
LS3 rail and injectors from 2010 Camaro SS (injectors 341 model no.)
Cam: 226/234 lobe sep 113* .598/.601
NGK TR6 plugs
104mm fast toys lid
TSP 100mm MAF
90mm Aftermarket TB
Griffin 3in Radiator
Hooker LTs

Tuned on two different occasions by a professional tuner with the same issues. Random lean condition only at WOT... PE is commanding rich 11.7 (for testing) and it hits 12.0 and climbs from there up to mid 13s. The car stops dead in its tracks once the AFR starts to climb and it almost feels like its missing and it does not ping.

I tuned the VE table within +-5% LTFT (SD) and I then I tuned the MAF with LTFT. I then matched the Dynamic air pretty decently to the MAF. It idles pretty solid and it cruises around 14.7-15.0. Very smooth transitions through the rpm levels.

The AFR is set to 14.63 and I have PE kicking it way down.

Fuel pressure when last checked with a window mounted fuel gauge was 58-60 psi.

You can see the AFR go crazy at 7:21:202 in the attached log file and my tune file is included. There are a couple more WOT runs in there as well...d

PLEASE HELP!

finallog-maftuned-pe.hpl

AFTER_VE_TUNE-LTFTADJUSTMENT-8.hpt

[SultanHassanMasTuning]

go mafless and see if it solves your issue, also your injector data isnt as it is LS3

[camaross340]

What do you mean about the LS3 injector data? I got the converted injector data on here in a previous thread about ls3 to ls1 converted data. Obviously if this is not correct then I should start there. Please help me out on the injector tables.

I tuned the VE up to 4000 rpm are you sure I dont need a maf? I guess in theory as long as my PE table is setting rich it should be fine to tune the VE past 4000?

thanks for your help

[camaross340]

I am going to remove maf and run in openloop SD, if that doesnt fix it then I know its something outside the tune.

[camaross340]

Update:

I decided against going SD OL and I will instead run SD CL.

I removed my MAF completely and then reset the fuel trims and went out for a little drive. Knowing that my LTFTs are pretty much within +-5 on the VE table I started to slowly getting into higher KPA and RPM areas.
For the most part it is now responding to the richness for a longer period but still climbs higher than I want it to. I adjusted the Open Loop F/A table and that seems to have helped a lot during wot. I am going to continue tweaking the PE values, OL F/A values and the VE table in the higher KPA vs RPM cells.

Attached is a new data log and my tune file.

Take a look at 7:26.721 of the log to see the A/F behavior. The commanded is not on there but it is 11.9.

mafless2.hpl

AFTER_NOMAF-OLFUELING.hpt

[dodiibob]

Update:

I decided against going SD OL and I will instead run SD CL.

I removed my MAF completely and then reset the fuel trims and went out for a little drive. Knowing that my LTFTs are pretty much within +-5 on the VE table I started to slowly getting into higher KPA and RPM areas.
For the most part it is now responding to the richness for a longer period but still climbs higher than I want it to. I adjusted the Open Loop F/A table and that seems to have helped a lot during wot. I am going to continue tweaking the PE values, OL F/A values and the VE table in the higher KPA vs RPM cells.

Attached is a new data log and my tune file.

Take a look at 7:26.721 of the log to see the A/F behavior. The commanded is not on there but it is 11.9.

mafless2.hpl

AFTER_NOMAF-OLFUELING.hpt

engine-spark-advance-main spark advance
copy your high octane to the low octane

[camaross340]

Ok, thank you. I will give that a go tonight. Haven't run anymore logs since my last post. My hope is the new tweaks I made in the VE table around 90-105 kpa and 4400+ will also help. Need to go out and log again.

Car feels so much more responsive without the MAF.

[camaross340]

So my AFR is now around 12.8-12.9 at WOT which is perfect! But now my injector duty cycle is at 99% at 6400 RPM! I know I have not maxed these LS3 injectors with a cam only... or have I? is there a way to scale these injectors?

The AFR recorded in HPtuners is .2 or .3 off what my gauge says.

Attached below is the log and my tune.

Notice the WOT runs with the ridiculous inj duty. I have since adjusted commanded AFR to start at 12.2 instead of 11s.

4:26.543

mafless5.hpl

AFTER_NOMAF-STFTenable-LTFTdisable-2.hpt

[camaross340]

So, I am still having issues... I am convinced at this point that it is the ECM. I will be putting a new one in this weekend. When the car gets hot after running awhile in 100+ degrees it starts acting erradic when under load. Injector values go all over the place.

[Exidous]

My LS1 with the below mods runs about 71% IDC with the LS3 injectors. I cannot imagine you'd be using another 30%. The exhaust has also been redone. At the power listed below the IDC was about 66%.

[camaross340]

My last dyno was 440rwhp 416tq.

[camaross340]

My last dyno was 440rwhp 416tq.

I need someone to look at my tune from above and make sure I have setup the LS3 injector tables correctly for my LS1 ecm (2001 411). I want to make sure I am tuning with the right injector data.

[camaross340]

Can you give me your injector data so that I may compare?

[SultanHassanMasTuning]

go to tune repository and download a LS3 camaro

[camaross340]

Ok, thank you.

I did that and this is what I end up with... Please review and help me out.

Please review the injector values
JUN15-WIDEBANDERROR-TUNE6.hpt

[camaross340]

IGNORE the last file I posted.

I think I have the values now:

Someone please help me by looking the injector tables over:

JUN15-WIDEBANDERROR-TUNE7-LS7INJ.hpt

I based them on a 2010 Camaro SS which these injectors came from...

[Exidous]

An LS3 Camaro with LS3 ECU will not have the proper data.

[camaross340]

I will give this a go tomorrow and let you know the results. Thanks so much Exidous!
Hopefully it was all in the tune because otherwise it is something mechanical.

[camaross340]

So it doesn't look like the WOT lean condition is a result of anything in my tune.

That said I have now noticed that the AFR only goes lean under high load situations such as higher gears like 3rd at around 5000 rpm.

I am going to have to check two things at this point. Fuel pressure via taped gauge on the window and also the voltage to the pump.

What is the best way to check the voltage drop to the pump under these conditions? I doubt my ECM would be able to tell me this?

[decipha]

if your not loosing fuel pressure under these conditions then the pump voltage should be sufficient