im about to finally install my NNBS intake on my 01 2500hd, and i know i need to change something because my stock FPR is vacumm referenced where with the vette filter it will be constant pressure. looking at my HP tuners between my stock tune and on from an 05 silverado that is returnless, my flow rate vs kpa is flat where the 05 tune looks to have a rising rate. mine is flat at 25.2, the 05 tune starts 24.5 and goes to 27.1. is this basically what i need to change? can i just copy this? thanks!

 

Take a look at 01-02 corvette injector settings, I would use those flow values. If your injectors are smaller, I would scale them by the difference in size. Not the cleanest way, but I don't think you will be able to use returnless fuel injector settings from a NNBS.

 

Don't use the corvette injector settings. Just load a 04, 05, or 06, 4.8, 5.3 or 6.0 file as a compare file. Then under Engine>Fuel>General>Injector Control General, copy over the tables that show to be different. (different color button)

 

Youll need a returnless file

If using gmt900 injectors youll need to scale accordingly

 

Ill be using my 01 injectors and see where im at with duty cycle. The returnless truck had same injectors right? So i figured i could use the scale off one of them?

 

If intake came with injectors use those as rhey are larger

 

Compare a silverado return and returnless fuel system injectors and see if there is a difference in the flow ratings.

 

Looks like replacment injectors are same part number. I dont have the injectors that came with the intake.