Injector tuning question

[Mattmothafin]

03 Chevy 1500hd 6.0 4l80e. Crew cab 4x4
In the xdf there's a category labeled fuel injector lbs/.. the table shows the stock which was 25.xx. I have a flow matched set of 28lb injectors, question is can I put 28 in the table and then adjust fuel rail pressure at the rail? The truck ran with the Injectors on a stock OEM tune but would hit fuel cut off... It did idle fine just and load fuel trims would go to just about -30 and truck would fall on its face.. any help would be appreciated, thanks in advance.

[ralmo94]

Is there a stock application for the injectors you used? There is more to it than just max flow, the pcm needs to know how long to command an injector open, because when it is commanded open it take an amount of time for them to open fully and close. This is called offset, and injector dead time, and others I can't think of right now. If you can find a stock calibration for the injectors you can use the stock settings. If not, there is a pretty good article on here from 84 elky about the subject
http://www.gearhead-efi.com/Fuel-Inj...oltage-Offsets