Flex fuel stock tune file dodge late model

[joeapple]

Does anyone here have access to any dodge pcm read that uses inferred flex fuel? My goal is to learn how this is accomplished, I have a basic idea how its triggered but blind guessing at the values is not ideal and studying how the factory does it would be great! Nothing in hp tuners repository. I will be tuning my 2019 HC red eye and I greatly appreciate your help!

[tbrtuning]

I can't remember exactly what vehicles but some of the V6 vehicles had factory flex fuel and are in the repository. You can copy the flex fuel section from there. The rest of the tune has places you need to change too that you'll have to work through and populate. You just might have to do a little math to know what values to input.

[spoolboy]

Try something like a 2016 3.6 Challenger.

[joeapple]

ok ill look through the repository again , thanks for the input!

[joeapple]

I can't remember exactly what vehicles but some of the V6 vehicles had factory flex fuel and are in the repository. You can copy the flex fuel section from there. The rest of the tune has places you need to change too that you'll have to work through and populate. You just might have to do a little math to know what values to input.

I looked through all the dodge tunes in the repository, also looked through all the files and there are only a few old Chevrolet tune files with flex! Was this response just a guess or did i miss a tune file ?

[tbrtuning]

You missed something. I'm not on computer now to look through them but when I first did flex fuel I started with something from repository that had flex fuel enabled to get the settings for the Flex Fuel section then just tweaked some from there

[joeapple]

You missed something. I'm not on computer now to look through them but when I first did flex fuel I started with something from repository that had flex fuel enabled to get the settings for the Flex Fuel section then just tweaked some from there

ok thank you, I will look over again!

[tbrtuning]

I'll look tonight if I get a chance and find that OEM tune or copy flex section over a stock read from something

[joeapple]

Found a file in repository, dodge challenger 3.6l v6, I searched dodge challenger only if anyone else is looking for factory flex tune, Thanks for help!

[fixit]

my 2 cents..
i've been looking at this too for the ncg3/4 platform.. some of the stage3 mopar stuff uses a "toys" pin to trigger the high octane timing and fuel tables..
the concept is described in "ESTIMATION OF ETHANOL CONTENT IN FLEX-FUEL VEHICLES USING AN EXHAUST GAS OXYGEN SENSOR: MODEL, TUNING AND SENSITIVITY" from u michigan, and is seems to all work with a narrow band, 4 wire, o2 sensor
a trigger from a change in fuel level (gas gauge) and the resulting new change in AFR causes a long term fuel trim that somehow translates in to an %ethanol .. i'm guessing somehow works back into the % ethanol