I finally bought HPtuners and a wideband. Also got an nnbs intake to swap on but that's for another thread. I've got a project thread titled "Always under construction".
Anyways, I still have to get a bung welded in for the sensor but until then I decided to just do some logging and tuning fuel trims with the narrow bands just to learn.

I was following along some YouTube videos on how to set it up and figured out that my maf and long term fuel trims were turned off. I assume this means I've been running an SD tune and didn't even know it???

So, can someone who knows more than me take a look at my tune and tell me what's going on with it? I would appreciate it very much.

 

Nothing wrong with SD and have LTFT off. Plenty of folks run that way.

 

I know there's nothing wrong with it, I'm fine with that. I would just like someone to look at it. It was still set at the factory rev limiter and shift points plus pretty conservative timing so I don't think it the tuning was completed. I bought it already built, but it makes no sense to build this thing and not spin it to where it makes max power.

 

The MAF is not disabled in that tune. It's set to MAF only technically but they disabled the MAF trouble codes for some reason, so you'd never know if the MAF has having an issue until it started running like complete garbage. The dynamic airflow is changed from the 4,000/3,900rpm factory settings where it runs blended MAF/VE to 4,000rpm and then MAF after that.

How "built" is this engine?

You are on borrowed time if this thing has any real mods with those stock fuel injectors.

Timing looks fine except for one thing, both high/low timing table should not be the same. The low octane table needs 4-5 degrees less timing in it. Not every engine needs 28 degrees of timing. This is a truck engine still with a truck intake etc etc, lots of engines still make great torque with 20-25 degrees of timing. Why run it on the very edge for 5-10 horsepower that you won't even notice.

Full throttle fueling is a bit rich but I've seen worse.

Make sure that your tire size and gear ratio is correct in the gear tire wizard in the edit tab too.

 

This is the info I have for the engine. If you think I need more injector, I'll order them. I have read enough of your posts here and on HP boards that I trust whatever you say.

I've already corrected the speedo, this is the original file before I changed anything at all.

 

If you plan to spin this engine pretty high, you will need more injector.

If the NNBS intakes came with injectors, you can use those as they are larger than the stock 25lb/hr that are currently in that tune file. At a minimum I would be running 31's or 33's to make sure you have enough fuel on a cammed 5.3 that will rev over 6,200-6,400rpm.

 

What are your thoughts on these?
https://www.lsxceleration.com/delphi...0aApQPEALw_wcB

 

Yes, those would work.

You can use a conversation spreadsheet to make the GEN 4 data work in the GEN 3 computer.

 

Thank you very much. I'll order them tomorrow.

 

The gen3 to gen4 converted injector data for the 12613412 injectors is in the injector sticky over at LS1tech. (FILE ATTACHED BELOW)

You'll also need the Delphi to EV6 injector harness adapters to fit the newer gen4 injectors.

I see in your build thread you are going with a TBSS intake and a C5 regulator/filter. I'm assuming you have a return fuel system hence the Corvette regulator?

If so when copying over the 50lb/hr injector data the numbers in the "Injector Flow Rate vs KPA" have to be progressive (climbing) in the "column axis". In the tune you have now with the vacuum referenced fuel regulator the flow rate numbers are static with the same 25.2 across the flow rate table (because the vacuum regulator does all the mechanical regulating). The C5 regulator is not vacuum referenced so you have to regulate the pressure differences in the tune itself. The good news is the "Flow Rate" in converted injector data is already ready to copy over.

Just open the attached file below as a compare file and copy all the different (GREEN) "injector control" numbers to your tune then "save as" and rename the file something line "New Injectors 3-27-2021"

You can see the Flow Rate below of the 50 lb injectors WITH the vacuum referenced regulator 50.4 across the column axis.



Now you can see the progressive flow rate for the C5 non vacuum regulator with the 50 lb injectors.