e85 AFR Reading
- Thread starter 65sohc
- Start date
E85 Stoichiometric is 9.7 vs Gasoline's 14.7.....so your track apps is worthless running E-85 because it flat lines at 10.0
I'm not running e85 but I am experimenting with e20, adding 2 gal. e85 to 14 gal. 91 octane e10 which gives close to 93 octane. Track Apps reading has not changed and the car runs perfectly.
Why are you experimenting without a proper calibration?
The info is in the link below. e20 was actually mandated in Minnesota several years ago after extensive testing in unmodified, non flex fuel vehicles revealed no adverse effects.
http://www.intercepteft.com/calc.html
http://www.intercepteft.com/calc.html
That's what I figured. It's a simple way of overcoming the California 91 octane limit and there should be enough adjustment in the ecu and reserve capacity in the fuel system to allow for this modest increase in ethanol content.
Yes the computer will adjust to 14.2 afr, but is that stoichiometric of your fuel?
(14 x 14.2 + 2 × 9.7) /16 = 13.6
Technically the car shoots for 14.2 (e10)
So you are running .6 lean. Then the real question comes in. What's your lambda on your tune??????
If your programming WOT shoots for .82 lambda (11.6 afr) and your fuel should be 11.15 afr you are only seeing .85 lambda.
Is it safe? Maybe. You might get more octane, but you are running leaner.
Hope that makes sense.
(14 x 14.2 + 2 × 9.7) /16 = 13.6
Technically the car shoots for 14.2 (e10)
So you are running .6 lean. Then the real question comes in. What's your lambda on your tune??????
If your programming WOT shoots for .82 lambda (11.6 afr) and your fuel should be 11.15 afr you are only seeing .85 lambda.
Is it safe? Maybe. You might get more octane, but you are running leaner.
Hope that makes sense.
I guess if you need that last 5hp. I wouldn't do it, but I run e85 with FI.Users who are viewing this thread
