Question about e40 tune

ysjeon1698

Specialist
Dec 1, 2016
79
14
0
29
Texas
I will be getting MHD and get rid of my jb4 g5.

When I get e40 map, do I need flex fuel kit? or how will I know whether im getting 40% of e85 or not?
 

doublespaces

General of the Army
Oct 18, 2016
8,945
4,152
0
AZ
Ride
2009 E93 335i
I just got tablet/ cables.. do you think I should wait for this to be implemented? or just go ahead and get e40 map ??
I think you'll need an ethanol tune no matter what. I would wait a little and see if they have any timeline, and then you could make a better decision probably.
 

Aaron

Lieutenant
Nov 3, 2016
544
200
0
Colorado
Ride
Silver 2013 335is 6MT
Without adding a sensor, you're stuck with calculating it yourself, and just assuming the gas station is at the proper e70-e85 levels. I did it this way for some time, and still now, and haven't run into any issues.