09-13-2022, 06:40 PM | #1 |
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Reading ethanol sensor while mixing at the pump isn't as easy as it seems
Most likely this has been talked about but was unbeknownst to me. Seems you need to be under load for the ethanol sensor (fuel-it) location to show up the new mix. I was adding E85 with the car running and checking the gauge but it wasn't changing. Im like wft is it broken?
Is that because there is a different fuel pump line for different load? I'm a little new to mixing fuel normally I go E85 can call it a day but aiming for a specific range is challenging with the unknown amount left in the tank. Had to guess how much E85 to fill then drive down the road under load to get a new reading. Did this 3 times to get an E50 mix correct. People at the gas station must thought I had a screw loose |
09-13-2022, 09:29 PM | #2 |
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No its because it takes a lot longer than you think for the gas to make its way to the sensor. there are several calculators that get you close that are available
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09-14-2022, 05:53 AM | #3 |
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Nah that isn't the case. I waited for ever, its not till you put the car under a load does it move flow by that sensor.
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09-14-2022, 08:14 AM | #4 |
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Yup, its not like i have been running ethanol for 5k miles or anything. There is a single fuel line. Under load your car uses more fuel faster so you see results at the sensor faster. Like i said, its a fuel demand/flow difference at idle vs under load.
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09-14-2022, 08:46 AM | #5 | |
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09-14-2022, 08:49 AM | #6 |
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It takes a while for Fuel it to show the ethanol content. After I pump I have to drive for 5-10 minutes before I see the readings change. My only issue with the Fuel it sensor now is I thought I would be able to tell what the ethanol content is at the e85 gas station without testing it. I had to test it 2 days ago because I was getting a lower reading with Fuel it and wanted to make sure I was putting enough E.
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09-14-2022, 08:51 AM | #7 |
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That would require also cloning and going back to the old ecu. Honestly i dont even see them doing this anymore. There is no full flex available on the new ecus.
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09-14-2022, 08:51 AM | #8 |
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Math. Try it.
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09-14-2022, 10:15 AM | #9 |
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09-14-2022, 10:50 AM | #10 | |
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09-14-2022, 11:00 AM | #11 |
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I have the fuel-it kit, and the mix starts changing as soon as I start driving after an E85 fill up
takes about 10 minutes before settling on the final number
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09-14-2022, 11:01 AM | #12 |
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+1, takes time for the mix to settle in your tank and make it to the fuel line. Just drive around for a while, only takes a few minutes.
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09-14-2022, 11:20 AM | #13 |
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Thanks guys, I thought I was going nuts since it took a while to see it change on the Fuel-It app.
BTW regarding true flex fuel, didn't now it was available yet? Please provide a link. Flex fuel was a nice option recently release by DS1 software though that is for Audi's. Was nice having it on the RS3, could fill up anywhere anytime and not have to change maps etc... |
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09-14-2022, 11:31 AM | #14 | |
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09-14-2022, 09:02 PM | #15 |
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Sure, so you can take a sample from the gas station, test the E content, then do math.
Or easier, look up the expected E content based on the latitude where you live, and time of year to get a good idea of what the E content SHOULD be, then do math. Either way will get you pretty darn close. Then your can adjust based on what the E sensor tells you. |
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11-22-2022, 03:46 PM | #16 |
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11-23-2022, 09:04 AM | #18 |
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Very very few people are running flex with the older ecu. Its not cost effective, nor would the choice of tuners for ecutek be ideal.
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11-23-2022, 10:48 AM | #19 |
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The closest station for E85 is 30min from me. They have been consistently over E70. Sometimes I test it at E79-80. I tend to play it safe and do the math for E70 mixed with 93 (E10). Just to get an average of E20. Roughly 1 gallon of E to 5 gallons of 93.
before I punch it, I drive about 10 miles allowing the fuel to mix. |
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