A/F Ratios and Lambda with e10/e15 fuel

[WileyCoyote520]

Howdy y'all,

I am trying to do some learning on how A/F ratios and lambda are affected when using fuel with different ethanol contents, i.e., e10 and e15. I have pasted some AFRs according to fuel with differing ethanol contents:

Gasoline(Petrol) = 14.7:
E10(10% Ethanol, 90% Gasoline) = 14.13:1
E15(15% Ethanol, 85% Gasoline) = 13.8:1

Questions:
1) How is the Stoichiometric A/F of 14.7 "re-calibrated" to the new Stoichiometric values when using e10 or e15?
2) Since my factory "widebands" or lambda sensors are basically set to register 1.0 when the engine is at a 14.7 AFR with 100% gasoline, what happens when I now am running fuel with 10-15% ethanol?
3) How is a car tuned to with the new e10/e15 fuel? What adjustments must be made?

Thanks for any clarification on this!

 

[BlowerMan]

Read everything in Lambda. A/f ratio isn’t way too confusing between various fuels with different compositions. So much easier my friend.

 

[RedVenom48]

Give @Willie a PM. He tunes his own car, so he would have a TON of experience in this area. He's also local to you too.