[Badbubba]

Originally Posted by mercedestech

Great info guys, thanks. Now to find the manual that came with my wideband so I can adjust it for Ohio fuel. I'll be sure to adjust my tune based on the new readings. If I am reading all of this info correctly, my car is actually extremely rich at WOT with an indicated 11.0 really being 10.5. This explains why my mpg are a lot less than others with similar setups. I have 0 knock under all driving conditions currently, but sounds like I might be able to lean it out a bit and still be safe and pickup a little power and mpg!

Guessing E10 in OH? Just remember, the stoich for E10 is lower than 100% gas. So your desired afr on E10 will be a lower value, than straight gas afr. Doesn't necessarily mean your running too rich. Change the stoich on you gauge and see where your at for wot. When people list there afr's, the stoich, type of gas, is needed to be known. If your desired afr for straight gas is 12.5, then for E10 it would be 12.0. It's not really more rich, it's just relative to the stoich. It is the same lamba .85.

Your 11 afr set at 14.7 should be 10.5 for E10. It's not running richer than you think, just different bc of different stoich. Still the same lamda. Wide bands are actually lambda meters that then convert to afr based on your stoich.