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For use guys that are running a flex fuel set up. Which content sensor are you using and what did it cost? I can get a genuine gm sensor which is the flow through type for around $200. I have not seen to many more for sale that are available locally

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https://www.sau.com.au/forums/topic/434195-which-ethanol-content-sensor-to-use/
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  • 7 months later...

If I was to use an Adaptronic Select plug in ECU will this be compatible with it?

Yes, but remember adaptronic ECU doesn't truly do flex fuel - as it doesn't have the capability to blend maps like say a haltech as such.. it just adds/deducts timing and compensates fuel based on rpm/load.

good enough if you're mainly using E85 and pop in the occasional 98 or blends

Do you just pop the sensor inline in the return line then call it a day?

yepp and connect the sensor up.. if you're really tight you can connect the output to a digital volt gauge to measure ethanol content.

0V = no ethanol

1V = 20%

2V = 40%

3V = 60%

4V = 80%

5V = 100% ethanol

  • Like 1

Yes, but remember adaptronic ECU doesn't truly do flex fuel - as it doesn't have the capability to blend maps like say a haltech as such.. it just adds/deducts timing and compensates fuel based on rpm/load.

good enough if you're mainly using E85 and pop in the occasional 98 or blends

I was reading a paper linked on the adaptronic forums that talked about ethanol content and knock resistance - peak ignition timing for port injected engines is at about 40% ethanol content and additional ethanol doesn't benefit knock resistance. it was interesting reading as it means your fuel map needs to vary from 0% to 85% ethanol (to get mixtures right) but the ignition map probably only needs to vary between 0% and 40% ethanol content. (I say probably - I'm not a tuner!). So even blending maps may not produce a perfect result, although it would be conservative with the ignition timing on a partial blend which is a safe option.

quick question, I'm looking at adding an ethanol sensor to my Link G4 sometime before the end of the year. The wiring manual for the continental sensor shows a +14v output from the ECU to the sensor, but there is no such output of voltage from the ECU. I'm thinking this is just a power source from battery/ignition but obviously I don't want to fry the ECU so can anyone help me out.

I feel like this is maybe a silly question but oh well lol

yepp and connect the sensor up.. if you're really tight you can connect the output to a digital volt gauge to measure ethanol content.

0V = no ethanol

1V = 20%

2V = 40%

3V = 60%

4V = 80%

5V = 100% ethanol

Hmm.

But the sensors output a frequency, 50 to 125 hertz if I remember correctly.

The whole point of the zeitronix box is to convert that to a voltage. If you didn't need it why would people buy it?

Edited by Ben C34

Got a link to the thread mate?

Can't find it on adaptronic forums, i think it was one of the discussions on flex fuel. Here's the actual paper though (see link down the bottom to PDF):

http://dspace.mit.edu/handle/1721.1/69496

Your correct, use a +14v ignition switched supply.

Thanks

I figured as much, the wiring drawing just confused me because it shows a 14v supply straight from the ECU. Figured that must have been just a switched power supply, but wasn't real keen to blow up the ECU so had to ask lol

Thanks

I figured as much, the wiring drawing just confused me because it shows a 14v supply straight from the ECU. Figured that must have been just a switched power supply, but wasn't real keen to blow up the ECU so had to ask lol

you got a diagram of that mate?

also anyone know where to buy the sensor plug?

I have sensor here but not sure how to wire it...

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