Thread: e85

9.85 for true E85, you can test stoich on your own with a small beaker, plenty of videos on youtube

Originally Posted by darkhorizon

Stock. I make changes in injector flow rate.

so you're stoich. Target stays at 14.7 even when you're running E85 and any mix between?!

Originally Posted by darkhorizon

Yeah. People say they change thier stoich values but I always fear that youll also need to make changes in the pe tables. The ls pcms work off of equivalence ratio aka lamba so any change to stoich value carries to all of the stoich modifiers... thats where you typically hear of this value being changed.

So, in prepping for E85, my current tune has the stoich. target AFR adjustment (9.85). I also, modified my PE tables to target my WOT AFRs to be somewhere around 7.2 or 7.3 I believe.

If you don't modify the stoich targets, won't the ECU continue to target what is in there? I guess you can change the injector tables to account for the ~30% additional fuel one would need for the stoich. of E85, but wouldn't the ECU just again re-adjust? UNLESS, the 3800 ECUs really do just target lambda = 1 until you get into PE mode, in which case it targets whatever Lambda is based on the PE targets.

Let me know if that doesn't make sense. I definitely want to get this right as my injectors (60#) came in last night, and I will be making the changeover soon!