• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

e85



In this case, the less you jack with the better. The pcm won't care.

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97AutoXVette said:
so you're stoich. Target stays at 14.7 even when you're running E85 and any mix between?!
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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.
 
darkhorizon said:
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.
Click to expand...

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!
 


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