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Flex Fuel Tune on nGauge all over the place on Alcohol %

Mestisoboy

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Hey everyone,
I flashed the flex fuel tune from xxx on my nGauge and it learned the 91 octane pump gas that was in my tank at 29% alcohol. Took it down to 0 miles and filled it with California E85 (90% alcohol). When I fired it up, let it idle, took the revs up to around 1700rpm then when it hit 40%, I drove and babied it till it flagged the Alch content. It only read 69% alcohol. It ran like crap and threw 2 running rich codes. So I flashed the E85 tune and then reflashed the flex fuel tune to see what it would read after a refill of E85. The highest it will read in the flex fuel tune is 76% alcohol.
Has anyone ran into this problem? Am I doing something wrong?
Why is 91 pump gas reading 29% alcohol?

I'd like a flex fuel tune that actually works. Not just something to get me by when switching to and from gas / E85.
I'm waiting for the final E85 tune revision from xxx but I'd like to figure out what the heck's going on with the flex fuel tune.
I'm getting no response from xxx.
The 1st E85 tune was pretty much dialed. Waiting on the final.
The 91 tune is also dialed after 1 revision.

I don't like to throw anyone under the bus but I'm not too impressed with the communication from xxx.
I'm about to toss it and jump ship to the competitor.
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WildHorse

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Well there's only a couple companies that use the ngauge. Anyways, did you MANUALLY TEST the ethanol content, then compared?
 

Nuked

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FF tune will only work if the fuel trims are on point. That means no leaks, good MAF transfer function, solid injector data and good O2 readings (transport delay in check, not sluggish sensors). You say that your E85 and 91 tunes were good, good as in fuel trims withing 2-3% or good as in no knock and AFR was "ok"?
 
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Mestisoboy

Mestisoboy

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Well there's only a couple companies that use the ngauge. Anyways, did you MANUALLY TEST the ethanol content, then compared?
Yes. 90% alcohol.
 
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Mestisoboy

Mestisoboy

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FF tune will only work if the fuel trims are on point. That means no leaks, good MAF transfer function, solid injector data and good O2 readings (transport delay in check, not sluggish sensors). You say that your E85 and 91 tunes were good, good as in fuel trims withing 2-3% or good as in no knock and AFR was "ok"?
Good as far as in no knock and AFR is OK. New to the tuning thing so that's why I spent the money to have "pros" do it. The car only has 3,500 miles on it.
 

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Nuked

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Good as far as in no knock and AFR is OK. New to the tuning thing so that's why I spent the money to have "pros" do it. The car only has 3,500 miles on it.
If you have logs of your E85 and 91 tunes look at the fuel trims (LTFT / STFT) and see how they look. If they are swaying alot >5% or more then there is your problem.
 
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Mestisoboy

Mestisoboy

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If you have logs of your E85 and 91 tunes look at the fuel trims (LTFT / STFT) and see how they look. If they are swaying alot >5% or more then there is your problem.
All they had me tick was STFT. On the 91oct log In looking at STFT 1 and 2, it's all 1's and 2's with an occasional 3 or 4.
I'll have to see if LTFT is tickable (or even there) & run another log. .
 
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Mestisoboy

Mestisoboy

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Stupid question, but you loaded the right tune correct?
Yes. ‍♂
Otherwise it wouldn't be reading alcohol %.
91 tune doesn't have it cause your running gas.
Dedicated E85 tune doesn't have it because they're assuming you have E85 in the tank.
 

WildHorse

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Yes. ‍♂
Otherwise it wouldn't be reading alcohol %.
91 tune doesn't have it cause your running gas.
Dedicated E85 tune doesn't have it because they're assuming you have E85 in the tank.
Haha apparently I need hooked on phonics
 

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AZ18yote

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Consider doing a KAM reset to reset recent fuel trims. Do you have stock air intake or after market? I ask as idle variation and maf turbulence can directly affect the ability to effectively run a flex tune.

I use my flex 100% of the time for performance and convenience. Runs like a beast for NA.
 
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Mestisoboy

Mestisoboy

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Consider doing a KAM reset to reset recent fuel trims. Do you have stock air intake or after market? I ask as idle variation and maf turbulence can directly affect the ability to effectively run a flex tune.

I use my flex 100% of the time for performance and convenience. Runs like a beast for NA.
JLT, nGauge and the tunes.

So KAM reset is disconnect the battery overnight correct?
 

AZ18yote

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JLT, nGauge and the tunes.

So KAM reset is disconnect the battery overnight correct?
I forget nguage does not have the KAM reset option like BDX. But you can also disconnect negative battery terminal for at least 30 min and turn headlights to on position to drain any current after.
 
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Mestisoboy

Mestisoboy

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I forget nguage does not have the KAM reset option like BDX. But you can also disconnect negative battery terminal for at least 30 min and turn headlights to on position to drain any current after.
So flash back to the flex fuel tune, baby it, then reset the KAM?
Then key on for a few minutes, start and let idle for 10 minutes, then baby it? Does the KAM reset trans shift points also? I'm reading I have to baby it through all gears, let trans temp get to at least 185°
It's currently on E85.
 

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Its not your tune its the intake. I have the same issue from time to time with the jlt. I was having issues early on with the car not learning properly so lund had me adjust the amount of idle time when switching fuels. Said its a common problem with the jlt. It still didn't always learn the correct e content but it was better. I test my fuel all the time so I know what my afr should adjust to and its hit or miss if it adjust right the first time. Usually a Kam reset will get the comp to adjust to the correct e content but just today I switched back from e54 to e85 and my car stayed at 12:1 so I did a Kam reset and and are wouldnt drop below 13.7:1 so I said F-it and switched to my e85r tune. Problem solved lol
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