Trouble with WOT maf tuning.

[Thomasen15/5.3]

I have a C10 with a 6l swap that im trying to tune. It came to me after a few other guys had already 'Had a go'. needles to say the tune was all over the place. Ive been working through it slowly fix what i can.
This truck has a 2006 6.0l out of a 2500. 2.4 whipple kit, apparently a 'tow spec cam', LSA injectors (Confirmed with part number of injector) Boost referenced reg running 58psi. There is a 2bar sd patch installed (Prior to me) P59 ecm Fly by wire throttle.
Trying to tune the WOT maf using AFR error from AEM wideband and after multiple revisions dont seem to be getting the changes i expect. The ve and part throttle maf all responded as expected.
I have not delt with a sd patched ecu before? im suspecting im doing something wrong?
Tuning wot in the ve table the engine will backfire and throw a code that prevents any throttle response until it is cleared. My apologies that i didnt record the code, but i suspect someone will know this issue. This is why im trying to tune the maf.
you will see in my log the WB going lean, the overshoot rich then start lean again gradually.
First time posting here so hopefully provided enough info.
Any help or direction will be appreciated.

Cheers
Blair

[TheMechanic]

I have a C10 with a 6l swap that im trying to tune words.... words.... words....Boost referenced reg running 58psi. There is a 2bar sd patch installed (Prior to me) P59 ecm Fly by wire throttle.
Trying to tune the WOT maf using AFR error from AEM wideband and after multiple revisions dont seem to be getting the changes i expect. words..... words..... words....
Cheers
Blair

[blindsquirrel]

Injector data is wrong, which is the first thing I looked at. Flow Rate is flat as if it was referenced, Offset is sloped as if returnless. What is your fuel system, what type regulator, is there a vacuum reference hose to the reg (if it has provisions), and what is the fuel pressure.

Airflow > Dynamic > High RPM Disable is still at 3800. That needs to be like ~150 RPM to put it in "MAF only".

Fixing the injector data now will mean you have to start over, any tuning you did up to now has those errors baked in.

[Thomasen15/5.3]

Its running a boost refenced adustable fuel reg, set to psi. I copied the injector data from a CTS-V stock file. I think i see the issue with the inj data. The CTS has a returnless system...
How would you adjust the offset for a referenced return style fuel system? I think ill change that inj data and try a quick maf only tune to see if there are any more problems.

Thanks again

[blindsquirrel]

GM Gen4 Injectors v2.1.xls

[Thomasen15/5.3]

Thank you!

[edcmat-l1]

There is a lot of bad in that file. Might want to consider paying someone. Or at least enlisting the help of some kind soul on here. Too much stuff to list, but it all starts with injector data. The offset is still stock. The SPA can't be right. Same with the minimum pulse.

LSA injectors have an angled spray pattern. They probably aren't the best to use in this application.

It won't make boost consistently the way it's setup. It'll throw P0068 and P1514 codes.

Probably idles like shit based on the spark tables.

[Thomasen15/5.3]

I have updated the inj data from the file supplied above, double checked the fuel pressure with vac hose disconected (58psi). Set high rpm disable to 150rpm, dcfo off cot off PE rpm delay to 8000 and BE to 300kpa. Even put the as found ve table in, incase that was somehow still being refenced . So should be no interference from VE table. I have done 3 or 4 revisions on the maf and get the same error data in the same cells and the maf curve is climbing out of control..
What else overides the maf?
Unfortunately this tune laned in my lap. Someone else that was at our shop took this job on, they had 0 experience tuning, spent a month on it, made it worse, charged the customer a bunch and said we would finish it for free in the spring. They no longer work here... so its up to me to try and make good.

[edcmat-l1]

Can you see your fuel pressure gauge from the driver's seat as you operate the vehicle? Could be losing fuel pressure as you accelerate.

Second thing is, put it in speed density and see if the problem goes away. Oh yeah you can't because it's not setup right and it'll go into REP.

[Alvin]

Some of the SD operating systems do away with using the MAF entirely. That might be why you are unable to make changes to the fueling. I haven't reviewed the files to comment on anything else.

[edcmat-l1]

Some of the SD operating systems do away with using the MAF entirely. That might be why you are unable to make changes to the fueling. I haven't reviewed the files to comment on anything else.

I was thinking that too. I know some of the older GEN3s didn't like to run the MAF on a SD COS. This is an 06 so P59 not sure if this is one that's why I suggested putting it in SD to see if it goes away.

[Thomasen15/5.3]

OK, thanks for the input!
Ill switch it all to sd and re tune. how do i set it so i dont get p0068 p1514 engine power reduced fault?
Yes the fuel pressure is holding steady.

[Thomasen15/5.3]

I believe I found the answer to my question, modify the p1514 error table in the diagram tab. X by 1.3.

[edcmat-l1]

Max it out

[Thomasen15/5.3]

Maxing it worked, SD tune done ✔️ can't get the comanded and actual to match exactly the top end, but are close enough. Figure this is due to the lsa spray pattern as you mentioned. Tidy up the idle timing and it should be decent
Thanks again for the assistance

[Alvin]

maxing them out sometimes pisses them off. Pick something that you'll never see but is plenty out of the way.. 2-3 works.