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Thread: B3601 Ethanol Fuel Testing Experiment

  1. #1
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Default B3601 Ethanol Fuel Testing Experiment

    Finally got curious and spent ~ $30.00 to test out the Ethanol content of my local gas station.

    1. Shell 91 Octane-'Nitrogen Enriched' gas. (Highest Octane you can get in Colorado).
    2. Pump states " Up to 10 percent Ethanol".

    Test results: E8

    Modified B3601 to Read: 14.2262
    B3618: 1:16 EQ..~ 12.25 AFR

    From left to right (in photo).

    1. Fuel Dispenser Bottle. Allows you to safely pour gasoline from approved container into an easily pour-able bottle.
    2. Fuel Tester Stand. Here you mix a precise amount of water ( 1 teaspoon) into container, followed by ~ 1 Tablespoon of fuel.
    3. "Quick Check Solution'. Detects alcohol. Colors alcohol blue.
    4. Safety gloves.

    So you put a small rubber end (supplied) into the Fuel Tester and shake vigorously. You let it stand for about 30 minutes. You then read Ethanol content on a scale on the front of the Dispenser.

    Comments: Technically you could devise a method to do this at home using your own supplies. The scale was incremented every 5% so it was a little hard to read.

    Tune-wise I did a CALC.VE using 14.68 as my value in B3601 (using same fuel as test). I then adjusted B3601 to 14.22. My Trims went from -1.3 to -4.4%. Overall then my MAF & CALC.VE lowered by the same 3% to maintain the same LTFT ratio.

    Overall an interesting test. While as Tuners we all agree AFR is not the value we should tune by, you still have to use it in B3601. I.E., you still have to understand the relationship between Lambda, EQ, and AFR.

    Last edited by WeathermanShawn; April 8th, 2011 at 10:32 PM.
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  2. #2
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    9.76 was what I remember for the AFR from e85, but I stopped using AFR after I went to e85. I would recommend changing your default units to EQ.
    E85 is NOT flex fuel.

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  3. #3
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Quote Originally Posted by nevinsb View Post
    9.76 was what I remember for the AFR from e85, but I stopped using AFR after I went to e85. I would recommend changing your default units to EQ.
    Thanks. My default units are EQ. B3601 must always be entered in AFR..that's how your Tune computes EQ..

    But, I get your point. I only showed PE AFR for display. I don't use it either.

    I was just curious if others have tested also..
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  4. #4
    Lifetime Member mr.prick's Avatar
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    Quote Originally Posted by WeathermanShawn View Post
    Modified B3601 to Read: 14.2262
    B3618: 1:16 EQ..~ 12.25 AFR

    Does my Math look O.K?
    (14.2262/1.16) = 12.263965517241379310344827586207

    You're off a little.
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  5. #5
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Quote Originally Posted by mr.prick View Post
    (14.2262/1.16) = 12.263965517241379310344827586207

    You're off a little.
    Good one mr.prick!.
    Last edited by WeathermanShawn; April 10th, 2011 at 12:53 AM. Reason: Relevance..
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  6. #6
    Joe (Moderator) joecar's Avatar
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    Shawn, can you post pics of what all comes with the test kit.

  7. #7
    Lifetime Member Chevy366's Avatar
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    Yeah the E content can be subjective from station to station and even pump to pump .
    FYI , there is DIY Ethanol stuff all over the internet and has been for years now .
    Last edited by Chevy366; April 8th, 2011 at 05:09 AM.
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    Member sixltrbtr's Avatar
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    Nice kit. Who makes it?

  9. #9
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by WeathermanShawn View Post
    ...
    Overall an interesting test. While as Tuners we all agree AFR is not the value we should tune by, you still have to use it in B3601. I.E., you still have to understand the relationship between Lambda, EQ, and AFR.
    Good observation...

    B3601 (stoichiometric AFR) is what converts the final commanded EQIVRATIO to fuelmass grams.

    To have a fighting chance, a tuner has to understand the relationship between Lambda/EQR/AFR and stoichiometric AFR.



  10. #10
    Joe (Moderator) joecar's Avatar
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    For anyone reading along, this relationship has to be understood:

    AFR = STOICH_AFR * Lambda = STOICH_AFR / EQR

    and, that relationship applies separately in each of commanded and measured contexts;

    when you cross contexts you get a correction BEN factor (if you cross correctly):

    i.e. BEN is all of these:
    BEN = commanded EQR * measured Lambda
    BEN = commanded EQR / measured EQR
    BEN = measured Lambda / commanded Lambda
    BEN = 1 / (measured EQR * commanded Lambda)
    . . .
    and other combinations using AFR.

    The easiest BEN to obtain is the first one listed above.

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