E-85 alcohol content

[michael evans]

Is there a way to read the input (A-6) to see the content besides seeing the map change ?

 

[Boost231]

what ECU?

 

[michael evans]

FAST

Changing from 93/alky to E-85 this winter

Was told that A-6 was the sensor input to the unit.

 

[gibbstroy]

You’ll need to change the fuel constant in Fast if you’re going to e85 full time.

You can use a GM flex fuel sensor to read the level of alcohol content and Fast has a setting for that as well. Then you can go back and forth.

I’m at work though and can’t give exact instructions. Maybe this will jog someone else’s memory.


Sent from my iPhone using Tapatalk

 

[michael evans]

Only will change back if I have to (run out of E-85).

 

[gibbstroy]

I’m a noob, but I hope this will get you started. In Fast, navigate to view/system config/fuel calculation param. The fuel energy constant should be set to 0.680 for e85.

In the same window, you can check the box for Fuel flex mode when you have a flex sensor installed and it will adjust the fuel energy constant itself.


Sent from my iPhone using Tapatalk

 

[michael evans]

me also.

I have been told 1 is gasoline, .680 is for E-85, and not that I need it .641 is for methanol (just alcohol).

What should I look for number wise in the dashboard with FuelEnCon for a good formula of E-85 ?

 

[gibbstroy]

I’m not using a flex sensor, but mine is actually set 0.617 for e98. So from 0.680 to 1 will be lower than 85%.


Sent from my iPhone using Tapatalk