Has anyone ever logged long term fuel trims vs. injector offset voltage vs. VE using 60lb injectors? I'm kinda curious as to everyone else's differences in trims when ignition voltage changes by +- 1 volt. I'm seeing as much as a 10% change in trim values and am going to make an attempt to write a semi-correct voltage offset vs. map table for 60lbers since the only ones out there are GM ones that, at least for me, aren't very good.

I wanna make sure I'm not the only one with crazy changes in fuel trims based on ignition voltage before I go playing with the offset table. Thanks in advance.

 

Umm, bump?

I'll post my results and any changes I make in trying to write a semi-correct injector voltage offset table for 60lb/hr injectors. I'll probably change to using a MAP based one rather than a vacuum as it makes it easier to log and edit. I'll be starting with the newest GM Stage 2 updated offset tune as a starting point.

I'm going to wait a few more miles and let my PCM learn fuel trims a little longer because I'll probably be doing it that way rather than AFR error, just because I don't feel like running through a couple tanks of gas in open loop when I can just multiply by fuel trims and be done. If it still sucks I'll prolly then try AFR error, but using trims should be easier for this.

 

Good luck with that. I can't even get the newest Stg2 reflash because my car was the test dummy for he stage kits for 07 and no one can get the calibration number from GM. Crazy...Make sure you post your results on the forum also so some of them can see what you have come up with.

 

Im gonna go ahead and say there all bouncing around like yours. 1V make a big difference with injectors as seen even with the idle.

 

I have my LTFT from 0 to -4 the whole way and I've never mapped them with a histogram the way you mentioned.
Dude, shoot me your email addy and I'll send you a few things I've worked on.

 

I"ll do some log runs tonight and post em up. I just switched laptops so my old files are gona

 

I too need to retune my VE table after porting the blower. If I remember I'll save the scan file and shoot it over.

 

Actually, what i've noticed was major -trim at idle, everything else seemed stable