E10 and Stioch for tuning

[Chalky]

In SE Wisconsin, we have E10 and have had it for some time. As I understand it, stioch is 14.1:1 using E10. If you know you will have a steady diet of E10, what can be done to tune around E10?

If 02 sensors are seeing 14.1:1, wouldn't the ECM try to lean the car out?

14.1:1 equals 96.38% normal stioch of 14.63:1. How would this impact WOT AFR and PE?

Would you have to make the same adjustments when doing VE and MAF tuning as well?

[SweetS10V8]

I bring this back up because I was going to make a thread asking the same question.

I'm kind of assuming that you just tell the ECU that your new stoich is 14.1 instead of 14.7. And since EQ ratio units and Lambda units both use percentages based off of the inputted stocih, that everything should stay in line.

I think this is where relying on AFR may lead you astray.

Am I thinking correctly?
Is stoich for E10 14.1:1?
Does anyone actually make this change in their tune??

[mr.prick]

There's a mile long thread on this somewhere around here.
14.13 is stoich for E10 IIRC.
Changing just the stoich AFR will change all tables with EQ,Lambda or AFR units
so after saving the .tun re-open it and make sure all your fueling tables
are where you want them to be.