Hello, I have the aem uego e85 wb and gauge. I am looking for safe afr values for the e85. I have read around 9.0:1 is stoich. Wondering what the safe range of that would be? everything that i could find was in gasoline adjusted afr. Also, im datalogging in evoscan with serial cable and the table only displays a value of 10. I know this cant be right. Does anybody else use this uego with evoscan? which model number did you select? i didnt see mine listed. did you have to change the formula in evoscan? I found revised formulas but they were only through the rear o2 sensor signal in the ecu and im using the serial cable. Any insight would be great thanks.
-Dan

 

sorry if these seem like novice questions. i spent lots and lots of hours looking through the threads.

 

most people just leave there gauge in Gas scale.

In Gas Scale
Idle = 14.7-15.2
Cruise = 15.5-16.5
WOT Spool up = 13.5
Full Boost = 11.5-12.0

Those are some generics.

 

yeah thats what i found in gas scale. how would i change the uego to gas scale? being the gauge and the outputs are not gas scale but e85 and have a range of 5.6:1 to 11.9:1 afr? would i just change to formula in evoscan for the voltage output signal of the uego? this is the formula in my directions afr=1.567(v)+4.825 and the formula in evoscan for WBO2 is 10.00+(16.99-10.00)*x/255. the formula in evoscan doesnt work.
Thanks

 

i would just buy a AEM ugo, gas one. it makes it a whole lot easier

 

if anybody knows any links to threads that i havent seen that would great as well

 

I was also looking for the spool up afr, but couldnt find it. I found the WOT afr numbers should be 11.8-12.2, thats what im shooting for... Still tryin to get the fuel map right

 

in gas scale for what i have seen so far TheBoz is pretty acurate. on e85 a lot of people recommend wot full boost to be 12.1:1 to 12.5:1. they say that it runs better if you run it a little leaner and give it tons of timing. on spoolup from what ive read id be a little nervous at 13.5:1. but i guess it would depend on how long it takes for your turbo to spool up. im running s2 cams so i only get like 5-10psi before 4000rpm and then 25psi at 5000rpm.


this is from injector dynamics. very good article for e85 novices
http://www.injectordynamics.com/AlcoholArticle.html

. Stoichiometric Air Fuel Ratio - Pure ethanol has a stoichiometric air fuel ratio of 9.003. The stoichiometric air fuel ratio of gasoline ranges from approximately 14.5 to 15.0 but is generally considered to be 14.7. Accordingly, the stoichiometric air fuel ratio of a mix of 85% ethanol and 15% gasoline is 9.972:1, while the ratio for a mix of 51% ethanol, 49% gasoline is 12.15:1. Based on these numbers, if we tuned our engine to a lambda value of .85 in the middle of winter, we could expect a lambda value of 1.036 when we switch to our summer mix.

 

my fuel in gas ratio eith e-85 wot is right at 12.1-12.2. cruise and idle normal 14.7ish.

 

How do get your your cruise afr to 15.5-16.5; aren't you still in closed loop cruising.