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Flex fuel

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Old Apr 11, 2018, 03:25 AM
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Flex fuel

Hi guys Iím new to this page. I just need some help on what Iím going to need to run flex fuel e85.

I was looking at this kit but what else am I going to need or does this kit have it all? https://www.maperformance.com/produc...8aAqPpEALw_wcB
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Old Apr 11, 2018, 08:13 AM
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To run true flex fuel where the ECU makes changes on the fly to different ethanol %, you also need a ethanol sensor setup.

DrivenFab makes one. Flexconverter makes one (I use that one). They are both Plug and Play.

Then you will need the Tephra XMOD V3 rom for your ECU to actually enable flex fuel tuning: http://www.tephra.it/v3/
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Old Apr 11, 2018, 08:26 AM
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A little OT but related question I have for those out there that do tune actual flex fuel. When your doing that are you cutting the E-85 with 87 octane? From what I remember Ethanol is mixed with low octane gas to formulate E-85 so thats what would make sense to me. I have no real world experience trying to do this though so I'd be interested to hear about how its done in practice.
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Old Apr 11, 2018, 08:31 AM
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Originally Posted by Biggiesacks View Post
A little OT but related question I have for those out there that do tune actual flex fuel. When your doing that are you cutting the E-85 with 87 octane? From what I remember Ethanol is mixed with low octane gas to formulate E-85 so thats what would make sense to me. I have no real world experience trying to do this though so I'd be interested to hear about how its done in practice.
No, I use the highest grade available. So 91 or 93.
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Old Apr 11, 2018, 09:24 AM
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Originally Posted by razorlab View Post
No, I use the highest grade available. So 91 or 93.
Is that a little CYA for the tuning process?
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Old Apr 11, 2018, 02:56 PM
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Originally Posted by Biggiesacks View Post
Is that a little CYA for the tuning process?
No. It's because a Flex Fuel tune is creating a tune that runs from pump gas up to 85% ethanol, so I tune between pump gas that is put in the car (Premium) and the highest ethanol percentage put in the car (approx E80-E82)

For example, here in California it's going to be between 91 octane (E10) and E85 (approx E80).
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Old Apr 11, 2018, 03:08 PM
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Originally Posted by razorlab View Post
No. It's because a Flex Fuel tune is creating a tune that runs from pump gas up to 85% ethanol, so I tune between pump gas that is put in the car (Premium) and the highest ethanol percentage put in the car (approx E80-E82)

For example, here in California it's going to be between 91 octane (E10) and E85 (approx E80).
That makes a lot of sense. That scenario probably happens pretty often for people going back and forth. Thanks for explaining.
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