The Official Unofficial E85 Ethanol Thread

SugarMouth said:

I'm told by UM 3 gallons per tank of E85 we are good to go. I guess people are picking up 20-30whp? Does that sound right?

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MiamiBourne said:

I recently sent an email to UM and they replied stating not to add e85 and that it could damage the engine.

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MiamiBourne said:

I recently sent an email to UM and they replied stating not to add e85 and that it could damage the engine. ----> I guess I would have to go to their Proflex.....

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SugarMouth said:

Last conversation I had 2-3 gallons was not an issue.

I ran 2-3 gallons for 20k and the car liked it.

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MSH said:

I suppose that's their indirect intent/play here

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krisprz8 said:

Question for those who have 2 separate maps for E85 and 91/93.
How low do you let the gas gauge get before switching to the E85 map or vice versa? I haven’t filled up on 91 since I got my R back from the shop. I was thinking that the best time to fill up is when the low fuel message pops up. Thoughts?? I only plan on using the 91 map for longer trips since I have multiple E85 stations near me. I’m lucky haha. I also have a flex fuel analyzer to read my ethanol content

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ChrisMk77 said:

How high Ethanol content was the car tuned for? If you are stock turbo you are probably not needing more than E60.

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krisprz8 said:

Why does it matter what the ethanol content was when it was tuned for E85? I’ve never heard of this. But if it matters I saw that the car had around E73 in it when I picked it up. Stock turbo with upgraded fuel pumps. The E85 station closet to me I have been able to get up to 83%. No issues with the higher E85 content.

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Optima said:

Hey folks,

I've been reading through the first 20 or so pages of this thread.

I just want to verify that I can run ~E30 on my 2016 Golf R.

Current Mods: APR Stage 2 High Torque 93 with DSG Tune, Full AWE Turbo-Back Exhaust, APR Intercooler, VWR Intake + other little bits.

If I understand this correctly, I can pull up to an E85 Station on Empty and put in 3 Gallons of E85 and top the rest up with Premium (91 or 92 Octane here in Oregon) - and off I go.

Is that correct?

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MiamiBourne said:

I know that I've seen where UM said it was ok for 3 gallons a few years ago but it seems like recently they have said no to add any e85 at all. I'm not sure what changed. Maybe it's that they don't don red/blue files anymore so it could be a change to their software.



I'm a Golf R FBO on 93oct and 28psi. I have the adjustable cable so I can make adjustments to boost and octane. I was hoping if I added a fuel gauge that I could adjust the octane when I reached up to e30...that was my question to them.



I recently sent an email to UM and they replied stating not to add e85 and that it could damage the engine.



I guess I would have to go to their Proflex...I just wanted to add some e85 to help in the warmer temps in NJ while at the track.



Also, does anyone that does have UM's Proflex have a gauge to read the ethanol content? I know UM taps into the ECM so you can read with VCDS or their user adjustable app but I'm wondering if anyone tapped into the wire from the ethanol sensor going to the ECM to add a gauge.



I'm not sure if tapping into that sensor wire would cause issues...

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jimlloyd40 said:

That's correct but your car would run even better if it was tuned for E. The main benefit without being tuned would be if it's hot out the ECU won't pull as much timing since your octane rating will be higher.

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