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Old 05-24-2018, 02:37 PM   #1
SamHouseIII
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E85 and 91 Tunes

Don’t have E85 at many places here, for those that don’t run it all the time are you swapping tunes when you do run it? What’s the side effects of not changing the tune when you don’t run E85 and just leave that tune in it. Even with a flex fuel sensor, there’s not a catch all tune for it right? Just wondering as I see folks slapping on E85 sensors and thinking this is good for running it, I know the tune has to be part of that.
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Old 05-24-2018, 04:02 PM   #2
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Just need the sensor and one tune. The ecm allows you to input the stoich and based on the flex sensor input, it will adjust accordingly to maintain the desired lambda and interpolate between tables for mixes in between.
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Old 05-24-2018, 08:51 PM   #3
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Originally Posted by RobZL1 View Post
Just need the sensor and one tune. The ecm allows you to input the stoich and based on the flex sensor input, it will adjust accordingly to maintain the desired lambda and interpolate between tables for mixes in between.
Actually your tuner will need to do 2 tunes IF you want to run pump gas and E85. First he will need to write a 91 or 93 tune depending on which you have available I'm your area then completely empty the tank and replace it with E85. You'll want to get the best E85 you can and he will establish a tune for it. Then the FF sensor can adjust to any alcohol level in between. In my area, I have 93 available and it measures 10% alcohol and E85 runs between 60% and about 78%.
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Old 05-25-2018, 08:07 AM   #4
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Having dedicated tunes is a risky thing IMO. When you switch fuels, there is no guarantee that you have completely emptied the old fuel out, so you may still end up with a blend. Also, ethanol content varies at pumps, so you may get E70 from one place, and E85 from somewhere else.

I can get you set up with everything you need to do true flex fuel. The advantage to doing that is you won't have to think about it when you do change fuels. You are correct in that the tune is very important (and required).
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Old 05-25-2018, 10:45 AM   #5
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Actually your tuner will need to do 2 tunes IF you want to run pump gas and E85. First he will need to write a 91 or 93 tune depending on which you have available I'm your area then completely empty the tank and replace it with E85. You'll want to get the best E85 you can and he will establish a tune for it. Then the FF sensor can adjust to any alcohol level in between. In my area, I have 93 available and it measures 10% alcohol and E85 runs between 60% and about 78%.
Just to clarify, what I'm saying is that it's just one tune file that's loaded. Sure, you need to tune for E, but you don't need to download a new tune file to the ECM every time you swap from 93 to E85.

I believe that is what Mr. Steck is saying as well. With the flex sensor and 1 good calibration, you're covered.
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Old 05-25-2018, 11:02 AM   #6
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Just to clarify, what I'm saying is that it's just one tune file that's loaded. Sure, you need to tune for E, but you don't need to download a new tune file to the ECM every time you swap from 93 to E85.

I believe that is what Mr. Steck is saying as well. With the flex sensor and 1 good calibration, you're covered.
Yes. I guess I should have made that clearer. I just meant that you couldn't have a 93 tune and stick in a FF sensor and be ready for E85.
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Old 05-25-2018, 01:19 PM   #7
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Originally Posted by beersngars View Post
Actually your tuner will need to do 2 tunes IF you want to run pump gas and E85. First he will need to write a 91 or 93 tune depending on which you have available I'm your area then completely empty the tank and replace it with E85. You'll want to get the best E85 you can and he will establish a tune for it. Then the FF sensor can adjust to any alcohol level in between. In my area, I have 93 available and it measures 10% alcohol and E85 runs between 60% and about 78%.
I thought the sensor only detects the content of the fuel then the ECM adjust accordingly. So are 2 tunes needed or just one?
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Old 05-25-2018, 01:21 PM   #8
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Originally Posted by DSX Tuning View Post
Having dedicated tunes is a risky thing IMO. When you switch fuels, there is no guarantee that you have completely emptied the old fuel out, so you may still end up with a blend. Also, ethanol content varies at pumps, so you may get E70 from one place, and E85 from somewhere else.

I can get you set up with everything you need to do true flex fuel. The advantage to doing that is you won't have to think about it when you do change fuels. You are correct in that the tune is very important (and required).
So for a true E85 tune you need just that and for true 91 you need just that tune, how is there an in between with just one tune?
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Old 05-25-2018, 03:04 PM   #9
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E-85 flex fuel tune

I don't know if this helps but I ran a E-85 flex fuel tune . I was able to upload a tune for 93 with flex fuel. Which gave me the ability to run either 85 or 93 without having to upload a tune each time . Only time I had to flash a different tune was if I was at a station that didn't have either 85/93 . Then I was able to flash a 91 tune as well ,so I was able to.run 91 or 85 . 😁
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Old 05-25-2018, 03:26 PM   #10
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Only time I had to flash a different tune was if I was at a station that didn't have either 85/93 . Then I was able to flash a 91 tune as well ,so I was able to.run 91 or 85 . 😁
Didn't you still have a low octane table just in case?
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Old 05-25-2018, 06:10 PM   #11
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OP, the dsx sensor is not an On OFF, or Yes NO sensor. It detects the amount of ethanol so it might read 10% or 45% or 85% for example, then it reports that to the ECM through a wire so the ECM can read from the ethanol and gas tune tables and adjust accordingly.
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Old 05-25-2018, 06:24 PM   #12
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So for a true E85 tune you need just that and for true 91 you need just that tune, how is there an in between with just one tune?
There is just one tune. After you install the equioment and have your competent tuner write a calibration for you, you are done. As long as you put either 93 or e85 in the tank, or any mix therein, you don't need to mess with the ecm again.
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