E85 Tuning Questions AFR Lambda etc

[mtocrs1]

Long story short. I just installed a long block in another members car. It runs on E85 with a Turbo Tweak wideband chip. Its programmed for 10.8 AFR under WOT. My question is related to AFR. The AEM wideband displays 14.5-15 AFR during cruise and Idle. Im assuming the wideband is reading 1.0 lambda and converting it to 14.7 /afr Stoich as it doesn't know its E85 and the stoich for E85 is 9.86 and its below the gauge range.
Also assuming the 10.8 is somehow converted to lambda for fueling calculations and wideband correction is actually trying to maintain a lambda of roughly .740 as 10.8 afr is way to lean for max power under WOT on E85.
BLM's are maintaining +/-5.

 

[TT/Ameasap]

Yes. 10.8 on gas scale is fine for E85. However, you can go a lot leaner. Some run 12.0 or more. I run 11.1-11.2 at WOT
E85 is very forgiving in lean situations, so keep that in mind. I have also read where being really fat is ok too. My car doesnt like to be really fat tho.