Exactly. And why you need to worry about the stoichiometric ratio. The more ethanol the lower the stoich ratio.

If you're after an interesting read, do a search through labrat's posts.. there is a good one he wrote a while back about the impact of adding ethanol to fuel (something that's become politically popular in my part of the world fairly recently).

Edit: I'm feeling generous... I did the search for you
https://www.rx8club.com/showthread.p...hlight=ethanol

 

Before and after doing some tuning. Suggestions welcome... :D

 

Very similar to what I get (mine stops at 7500 rpm though...). Please next time also record catalyst temperature (theinferred PCM parameter). It might be a bit on the high side now and hitting hard on your cat longevity. Maybe you removed your cat?

F

 

I tested ethanol in a dyno lab - while it has less energy content per unit of volume, it has a higher octane rating (around 100) and with a 10:1 ratio for pure ethanol you can pick up 10-15% more power then gasoline

 

I read pretty much the whole thread minus some of the seemingly off topic stuff. Very educational stuff, but it appears the following is true (stoich x lambda = AFR).

If the above is true then it doesn't matter if you tune for AFR or Lambda. You will never know your true stoich value because it will changes between fillups. So you must generalize the stoich value, hince a mathmatical constant 14.6?

So no now for the proof assuming Stoich = 14.6:
1) 14.6 x Lambda = AFR
2) 14.6 x Lambda = 14.6 x Lambda
3) (14.6 x Lambda)/14.6 = (14.6 x Lambda)/14.6
4) Lambda = Lambda

So basically what I'm getting from this is Stoich value will screw you whether you tune for AFR or Lambda because your always treating a variable value as a constant.

Again, 1/2 the stuff in the thread is over my head and I'm just trying to learn as much as possible, so it's very likely that I am wrong,.

 

that sums what i think about the subject anyway

 

What fuel are you using?