[Diy_efi] running E85

[Bruce A Bowling]

The narrowband O2 sensor will still operate, indicating excess or reduced o2 content wrt reference o2, and you can determine the stoich operating AF point. 

If you are going to run nothing but E85, always and forever, then adjusting fuel maps and timing will work. If you plan on running different fuel blends (i.e. a tank of E85, then a tank of regular gasoline, etc) then you will need to means to adjust the fuel and spark maps to adapt to the blend. A fuel composition sensor will do this for you.

See http://www.megamanual.com/flexfuel.htm  for more information.

- Bruce

-----Original Message-----
>From: Tim M <diyefimail at superxtune.com>
>Sent: Jun 15, 2006 10:54 AM
>To: diy_efi at diy-efi.org
>Subject: [Diy_efi] running E85
>
>Just wanted to review what it takes to run E85.
>
>Vehicle was designed in the mid 90's so O-rings and
>such should handle E85.
>
>>From what I have read the amount of fuel needs to be
>increased by 27%. This can be done by increasing fuel
>pressure, switching to bigger injectors or increasing
>the fuel map(s) by 27% if within operating limits of
>stock injectors. (lowering rev limit will allow the
>stock injectors to work on the vehicle I am looking
>at).
>
>Not completely sure what will happen while running
>closed loop with a narrow band sensor. Will it toggle
>at the correct stoich for E85? 
>
>Spark can be advanced some. I will carefully test with
>a knock sensor. For now I will assume stock ignition
>will be ok.
>
>Anything else to consider?
>
>Thanks,
>Tim
>
>_______________________________________________
>Diy_efi mailing list
>Diy_efi at diy-efi.org
>http://lists.diy-efi.org/mailman/listinfo/diy_efi