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2010 2011 BMW 5 Series Forum F10 E85 Mix for higher octane? |
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01-19-2016, 12:53 AM | #1 |
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E85 Mix for higher octane?
I live in California and the highest octane at the pump is 91.
I usually mix 100 octane ($9/gal) + 91 to achieve higher octane. I read somewhere that FenixMike uses a E85 + 91 mix in AZ to achieve higher octane. Which is very cost effective compared to 100/91 mix I know they're myths that E85 corrodes parts of the fuel system, etc. but there are no facts to prove this in modern cars of the past 10 years. I'm also not trying to achieve a 50/50 mix or anything like that. I'm looking at maybe a 30/70 to reach 93 octane on the daily (actually 40/60 since pump gas contains up to 10% ethanol) I'm also aware of the Toluene/Oil/Pump gas method to achieve higher octane but that's not cost effective nor worth the hassle. Anyone else do the E85 + 91 mix or maybe FenixMike can shed some light on this more. |
01-19-2016, 03:02 PM | #2 |
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I put in 6 gallons and the rest 91. I've had increase of performance and no check engine lights. I tried to push that limit and put 8 gallons and got the error. I experimented starting from 4 gallons and went up a gallon on each refill. Mpg's are crap as expected wth e85 mixes.
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01-19-2016, 03:46 PM | #3 |
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So you should be around 96 Octane with that mix assuming you fill up with around 1 gallon left in the tank so that would leave a remaining 17 to be filled.
(FUEL Octane x # of Gallons) + (FUEL Octane x # of Gallons) Divided By Total Number of Gallons = Combined Fuel Octane (105*6)+(91x11)/17=95.9 |
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01-19-2016, 04:19 PM | #4 | |
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My formula looks more like (105*6)+(91*10)/16=96.25 But given I have 2 gallons in the tank it's more like: (105*6)+(91*12)/18=95.6 So yeah roughly 95 octane. So like I said anything above 6 gallons of e85 mixed with 91 on oem hardware you'll throw errors. So 95 is about the highest when mixing that fuel combo on oem setup. I'm sure it will allow for higher when using toluene / race fuel / Torco.
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01-23-2016, 02:28 PM | #5 | |
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01-23-2016, 05:16 PM | #6 |
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No, but if my rump-dyno was to guess it feels like a 10-15whp gain in mid to high range
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01-23-2016, 07:03 PM | #7 |
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What about with Torco?
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01-23-2016, 07:45 PM | #8 |
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Torco has not gone down, yet.
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01-26-2016, 11:17 PM | #9 |
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Ebay sells for $20-22 for 20oz
I bought 6 for $120 i think
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04-03-2019, 10:12 PM | #12 | |
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04-04-2019, 11:45 AM | #13 |
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What about possibly running maybe E30 on a BMS stage 1? I'm still fairly new to the n55 platform. I come from a highly modified ms3 that was tuned for e85. I'm not as familiar with cars dumping in e85 that are not tuned for it.
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04-05-2019, 04:08 PM | #14 | ||
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So I was already aware of that and was asking other members at the time their experience running E85 because it's cheaper than race fuel and the results are the same. |
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