Originally Posted by Evo9_Dubai

It is not the fitronic the issue. You can buy ANY Ethanol content sensor with a 5v output, such as AEM or Zeitronix and wire it to the ECU. It can be wired to the alt map switch pin and logged in evoscan. Although the issue remains that the few that have the rom+definition for the flexfuel options are selling it only. And if you buy it, that does not give you the definition so you can play with it and learn it yourself. I have done flexfuel on tephraxmod v3 and it is fairly simple, tune a pump gas map, tune an E85 map and enabling the flexfuel will do the rest.

Originally Posted by alpinaturbo

Sensor reads Hz not Volts.
So its useless to ECU.

https://www.aemelectronics.com/files...nsor%20Kit.pdf

GCCODE:
The premise that Sensor signal can "just be used" by ECU is based on no understanding how ECU works, and how sensor works.

It if was so easy, it would not take professional electrical engineers, gifted software engineers, to develop a controller and ECU ROM.

Originally Posted by razorlab

The continental sensor that everyone uses (like that you linked to) does indeed output in Hz. However, all the flex fuel kits have a Hz to V translator which makes it usable as an input to the ECU. You can find these for under $200.

Originally Posted by kaj

I'm using an Innovate sensor/gauge. Much cheaper than the Fitronic, though I admittedly have no use for it's display. I don't even have my ethanol gauge out where I can see it.

Originally Posted by razorlab

Zeitronix sells their ECA2 for $179. It's one of the cheapest options. The continental/gm sensor (part #13577429) itself can be had for $50. GM Harness for the sensor is $15. (part #13352241)

Ground, power, output. Done.

Originally Posted by alpinaturbo

Sensor reads Hz not Volts.
So its useless to ECU.

https://www.aemelectronics.com/files...nsor%20Kit.pdf

GCCODE:
The premise that Sensor signal can "just be used" by ECU is based on no understanding how ECU works, and how sensor works.

It if was so easy, it would not take professional electrical engineers, gifted software engineers, to develop a controller and ECU ROM.

Originally Posted by gqcode

Right the sensor does read hz no argument but the Innovate gauge does transform that signal into an output voltage 0-5 vdc which I connected to Pin 42 which allowed me to run ff. Very simple and cost effective and I'm still open to get the car tune by any tuner instead of 3. this only true for VIII but not IX

Originally Posted by kaj

Not true. I have a IX and used the same method.

Originally Posted by ronaldo9

i believe he's referring to the Rom to use flex fuel on stock ecu. Currently its only available for evo 8 unless you made your own from the patch or purchased a fitronic kit.

Originally Posted by Evo9_Dubai

It is not the fitronic the issue. You can buy ANY Ethanol content sensor with a 5v output, such as AEM or Zeitronix and wire it to the ECU. It can be wired to the alt map switch pin and logged in evoscan. Although the issue remains that the few that have the rom+definition for the flexfuel options are selling it only. And if you buy it, that does not give you the definition so you can play with it and learn it yourself. I have done flexfuel on tephraxmod v3 and it is fairly simple, tune a pump gas map, tune an E85 map and enabling the flexfuel will do the rest.