E85

[_Ben]

Originally Posted by simon varley

I don't really know how the haltec sensor works and the website doesn't explain it as far as I can see. I know that Ford use a knock sensor on the block of their FFV cars to adjust timing based on octane rating. The 2.5 Ranger is flex fuel up to 100% for South America.

From what I've read, you make tunes at various ethanol ratings - one on straight 98 (or whatever), one on E85, and a few between. The e-Flex sensor tells the ECU what % of ethanol there is, and then the fuel map for the relative amount of ethanol is used.

[simon varley]

I get all that - just can't figure out how you can determine % ethanol from this sensor. I assume some kind of conductivity or resistivity measurements?

[ratter]

Ford's ecu pulls spark based on a knock event, it does not change to a different fuel map, it does not allow for the use of a flex fuel sensor to change fuel or spark maps based on ethanol percentages.

[johnydep]

So far the E85 performance improvement is great, I like it. I am noticing the fuel gauge dropping faster, which I don't like.

For the slightly better power, I don't think the extra fuel use makes the fuel worthwhile for street use. I might try one more tank fill, but after that I'll only use it for strip use.

[F250_dually]

I've been using E85 for about two months now. Can't say I've noticed an increase in HP though I haven't retuned. Mileage has been slightly better but that may be due to more highway driving. I have however noticed more exhaust steam in the mornings but again that could be due to the cooler nights?