Tuning Factory Throttle Body

[briscobones]

So I have an 07.5 Sierra with the factory L76 truck engine.
I swapped out the 87mm factory TB for a 90mm factory TB.
AC Delco part #12605109

I read its an OEM for anything from an LS3 to an LS7
So, I was going to pull a stock tune off the repository and copy over the data.
I just dont know what stock tune to grab and also what data to transfer over



Also, as a bonus question, now that I switched to the LSXRT manifold: do I need to change the manifold volume parameter under Airflow--> Speed Density

[5FDP]

Should really only need to change the ETC Area Scalar for the new 90mm throttle body. The rest is tuning the airflow model again to touch it up.

[Jon S.]

The throttle body that you installed was never used on Truck platforms.

Good chance that your 2007 Truck E38 (likely running OS 12614088) will not like that throttle body.

Also, your truck is a Gen 4, and you have mistakenly posted in the Gen 3 section.

[briscobones]

So working on the tune, with the first startup I was stuck in open loop, idling at 18:1.
My brother recommended increasing MAF table by 10% until I get in closed-loop and using STFT to the MAF.
Well I ended needing to add 50% to get to CL, AFR's started to come down. Just feels like 50% is a lot, any thoughts on this?

(only thing I have down to the tune from how it was is scaling the injectors, the computer maxes out at 63.5 and the data went to 90 or so. Found an article on here saying to cut IFR in half and double the AFR)

[5FDP]

You shouldn't ever need to add that much fuel.

If you needed to do the double stoich method, yeah you would need to cut the IFR in half and half the IVT terms as well. So that 90lb/hr would be 45lb/hr or whatever scale it needs to be.

[briscobones]

You shouldn't ever need to add that much fuel.

If you needed to do the double stoich method, yeah you would need to cut the IFR in half and half the IVT terms as well. So that 90lb/hr would be 45lb/hr or whatever scale it needs to be.

Yup, doubled stoich AFR, cut IVT Terms and IFR vs Pressure Delta in half.

I did adjust the ETC scalar for the throttle body, TPS readings are consistent with the stock TB.
Could my scalar data be wrong and that's what's causing these issues?
Also I only adjusted ETC scalar, I noticed the stock tune uses RPM and my truck uses VSS.

[briscobones]

Ive decided to start eliminating variables.
First thing in the morning Im going to flash a tune that doesnt scale the injectors. If that doesnt work, Im putting back on the stock TB. Those are the only things in the tune Ive changed so its got to be one of them

[briscobones]

I have put back on the stock throttle body, old MAF, no scaling on injectors and still having trouble.
Still stalling, still needing like 30% fuel added
I noticed that my "Control Module Voltage" drops below 12v as it dies. Not sure if this is a side-effect or cause, going to check/clean grounds tomorrow, before I continue tuning.

[blindsquirrel]

90lb injectors with a 63lb-limit ECM is never going to work unless it's scaled.