E85 with Flash Tune Only?

jh_f30 · 02-21-2018, 10:17 AM

I've been reading a lot about the virtues of E85 mixes. I just flashed my dme via obd with Active Autowerke with a map for 91 oct. I was wondering, if I wanted to play with E85 mixes, would it be enough to just ask AA to send me a map written for say...E30, load the map and fill 4-5 gallons of E85, and top it of with 91? I'm not running JB4, which I know includes flexfuel wires, but being a noob in this realm, I have no idea what that means or if it's necessary with a BEF.

My car is a 2013 335i PWG. Mods include cp, c/l dp, axleback, and AA flash tune. Any pointers would be appreciated! Thanks!

Marlinman · 02-21-2018, 10:49 AM

I believe flash tunes can be used with E85 mixtures. The flex fuel wires are specific to JB4 since it is piggybacking off the system to begin with. In your situation I'd make sure to let AA know that you are using 91 since adding e85 to 91 brings it up to something more like 93 whereas most guys running e85 maps are starting with 93 fuel and adding e85 on top of the 93. Just my two cents.

badbread · 02-21-2018, 11:02 AM

So to "piggyback" off your question...

I add a few gallons of e85 at every fill up (not right now due to the MHD beta), goal being to increase the octane level.

If my calculations are correct, I usually end up with about 94 octane fuel or E29

In a case like mine, do I use the 93 octane maps or the e85 maps? When do you know which map to use?

Hope that makes sense...

Mike@N54Tuning.com · 02-21-2018, 01:23 PM

E85 is one difference with the JB4 and Flashes.. With the Fuel sensors the JB4 will adapt to the level of E85 you put in, while with a flash you will need a map specific to your E mix you plan to use. You can be off a few percent, but if you have an E60 map you can't run E30.

So if flashing stick to a predefined mix and get the map for that, but unless you change maps you are committed to that mix.

Mike

mike@x-ph.com · 02-21-2018, 03:19 PM

You can run it with either tune but as Mike said with flash you need a specific E85

ceedawg · 02-21-2018, 08:09 PM

Quote:

Originally Posted by mike@x-ph.com

You can run it with either tune but as Mike said with flash you need a specific E85

Funny I was talking to you about this today!

mike@x-ph.com · 02-21-2018, 09:07 PM

Quote:

Originally Posted by ceedawg

Funny I was talking to you about this today!

Niart906 · 02-22-2018, 06:48 PM

FWIW, MHD's flash tune should be made public shortly. I've been beta testing a back end flash through MHD while still using my JB4. My primary reason for doing this was to maintain the flexibility the JB4 is known for. That way I can add ethanol whenever I want without the need to reflash.

Mike@N54Tuning.com · 02-22-2018, 09:20 PM

Quote:

Originally Posted by Niart906

FWIW, MHD's flash tune should be made public shortly. I've been beta testing a back end flash through MHD while still using my JB4. My primary reason for doing this was to maintain the flexibility the JB4 is known for. That way I can add ethanol whenever I want without the need to reflash.

Keep us updated!

Mike

02-21-2018, 10:17 AM	#1
jh_f30 Lieutenant Colonel 1307 Rep 1,827 Posts Drives: 2013 335i Sportline Auto RWD Join Date: Aug 2017 Location: Bay Area, CA iTrader: (2)	E85 with Flash Tune Only? I've been reading a lot about the virtues of E85 mixes. I just flashed my dme via obd with Active Autowerke with a map for 91 oct. I was wondering, if I wanted to play with E85 mixes, would it be enough to just ask AA to send me a map written for say...E30, load the map and fill 4-5 gallons of E85, and top it of with 91? I'm not running JB4, which I know includes flexfuel wires, but being a noob in this realm, I have no idea what that means or if it's necessary with a BEF. My car is a 2013 335i PWG. Mods include cp, c/l dp, axleback, and AA flash tune. Any pointers would be appreciated! Thanks! __________________ 2013 F30 335i RWD ZF Melbourne Red ~Remus Sport Axleback~VRSF Chargepipe~VRSF Catless Downpipe~GPlus FMIC~HR Sport Springs~Active Autowerke OBD Flash Tune Stage 2~
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02-21-2018, 10:49 AM	#2
Marlinman First Lieutenant 101 Rep 316 Posts Drives: 2013 335i xDrive Join Date: Jun 2015 Location: MD iTrader: (0)	I believe flash tunes can be used with E85 mixtures. The flex fuel wires are specific to JB4 since it is piggybacking off the system to begin with. In your situation I'd make sure to let AA know that you are using 91 since adding e85 to 91 brings it up to something more like 93 whereas most guys running e85 maps are starting with 93 fuel and adding e85 on top of the 93. Just my two cents.
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02-21-2018, 11:02 AM	#3
badbread not good, but bad 333 Rep 361 Posts Drives: 2013 335i Join Date: Jun 2016 Location: Bay Area, CA iTrader: (3)	So to "piggyback" off your question... I add a few gallons of e85 at every fill up (not right now due to the MHD beta), goal being to increase the octane level. If my calculations are correct, I usually end up with about 94 octane fuel or E29 In a case like mine, do I use the 93 octane maps or the e85 maps? When do you know which map to use? Hope that makes sense... __________________ They are spelled BRAKES not breaks!!!! Oh FFS, not another spark plug thread! BreadsBMW on Youtube
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02-21-2018, 01:23 PM	#4
Mike@N54Tuning.com BimmerPost Supporting Vendor 4918 Rep 115,980 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	E85 is one difference with the JB4 and Flashes.. With the Fuel sensors the JB4 will adapt to the level of E85 you put in, while with a flash you will need a map specific to your E mix you plan to use. You can be off a few percent, but if you have an E60 map you can't run E30. So if flashing stick to a predefined mix and get the map for that, but unless you change maps you are committed to that mix. Mike
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02-21-2018, 03:19 PM	#5
mike@x-ph.com BimmerPost Supporting Vendor 24199 Rep 190,807 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	You can run it with either tune but as Mike said with flash you need a specific E85 __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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02-22-2018, 06:48 PM	#8
Niart906 First Lieutenant 179 Rep 331 Posts Drives: 2017 M3, 2003 M3 Join Date: Feb 2015 Location: Dalton, PA iTrader: (0)	FWIW, MHD's flash tune should be made public shortly. I've been beta testing a back end flash through MHD while still using my JB4. My primary reason for doing this was to maintain the flexibility the JB4 is known for. That way I can add ethanol whenever I want without the need to reflash. __________________ 2017 F80 M3 - Mineral White/Amaro Brown 2003 E46 M3 - Jet Black/Cinnamon
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