with e85 and all motor setups, it is very easy to shoot past mbt without even realizing it. the distance between your knock level and knock threshold is much wider with e85 and thus you're able to get away with more ignition timing at all load levels.

as far as the afr's go. like the other guy said aim richer. not too much though. it's odd that the difference between your afr and afr corrected values is so far off. usually when i aimed for ~13.0 afr the values were almost identical. when i had to go richer than 12.5 though is when the values started to be off more and more.

this is another reason why i like the dyno. the oem wideband is ok but when you're trying to aim for richer afr's at full throttle it doesn't work all that great. i prefer to double check with the dyno's wideband.

 

I have an external wideband that I installed to verify my primary O2 sensor. It read WAY closer to the uncorrected value, so I don't really use the AF Corr value anymore. I've also noticed that when I make a 1% change to fuel to the fuel table, the AF value will indicate close to a 1% change, but the AF Corr value will not indicate much of a change at all.

Hondata calculates the AF Corr value using the AF value, so they are mathematically linked. They will only be equal to each other at 14.7 or above. When AF is richer than stoich, the gap between AF and AF Corr gets bigger and bigger.

 

what aftermarket wideband are you using?

 

It is an Innovate LM-1. Here is the thread about it.
https://www.s2ki.com/forums/index.ph...ic=760714&st=0

 

Over in the world of E85-powered Evos, open loop AFRs get leaner as temperature drops. Its most obvious for the folks whose ethanol in their fuel is the same year-round. Its typical for the AFR to go over one point leaner between say 80-90F and 30-40F. It caught me off guard the first winter, but thankfully, all that tends to happen when going lean with E85 is misfire / ignition breakup. For the first few winters, I just richened up my fuel map, but this winter I'm contemplating tweaking other tables to fix it. I've been trying to figure the cause of the lean out. It could be simply a crappy factory air density calibration, or perhaps it has something to do with ethanol's low vapor pressure. I've done my share of reading trying to find an answer, but so far, all anyone talks about is having to retune for E70 in the winter. Wondering if anyone on this forum seen the same lean AFR issue with a drop in air temperature.

 

cold air is denser per volume. if your car was tuned already, don't adjust the main fuel map. tweak the iat tables.

with regards to ethanol, in the case of e70, yes you would have to retune it if it was tuned on e85 before. it should be a minor revision.