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romnation romnation is offline
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Default What's the highest percentage of E85 I can run without cold start problems? - 10-25-2018, 10:24 AM

What's the highest percentage of E85 I can run without cold start problems in winter? I'm in Chicago, so we could definitely see 0F temps, or even possibly single digit negatives in the thick of winter. What is a safe number to run where i won't have issues? Will 30% be okay?
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alvinhobh alvinhobh is offline
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Default 10-25-2018, 10:43 AM

Pretty sure the only limit is your ability to tune it correctly to run whatever fuel % you want. Fuel tables can be adjusted to run full e85 in the cold with no issue.


07 335i e92 - money pit
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fnne99 fnne99 is offline
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Default 10-25-2018, 11:28 AM

When we had our e92, I ran e30-e35 for years in Denver in the middle of the winter when temps routinely got down to single digits or below zero with no starting issues. Maybe a long crank once in awhile and rough initial idle occasionally but no real problems. This was with just the jb4 and also the jb4+tune.
Maybe I was lucky...
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BMWSwede BMWSwede is offline
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Default 10-25-2018, 02:15 PM

I live in nothern Sweden an we have -22F or even lower in winter.
And I have no problem with E40. Running E85 flash


2007 E91 335Xi M-Sport MT
FBO W In/outlets
E85 BEF
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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is offline
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Default 10-25-2018, 03:10 PM

We run straight E85 down to 40F without issue. May idle a bit rough for the first 30 seconds but never fails to start.


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hi rpm's Avatar
hi rpm hi rpm is offline
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Default 10-25-2018, 03:14 PM

I ran 30% last winter with no problem, single digits a few times I think. I've already had some hesitation at 50% below 50ish, but it starts.
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KevinC39 KevinC39 is offline
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Default 10-26-2018, 06:03 AM

I stop running a mix in winter just because I don't want to freeze my ass off standing at the pump swiping a card twice and dealing with all that.


E90 N55 RWD 6MT MHD Speedtech EFR7670 MFactory LSD
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Riceball777 Riceball777 is offline
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Default 10-26-2018, 11:23 PM

There is a huge difference for cold start when your comparing e40 to full E85. I run 100% full E85 in my s2000 and if it’s in the 40,s it starts and runs like crap for the first minute or so. If I put even 1 or 2 gallons of 91 octane in it lowering it to about e70 it starts and runs like normal.


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v8bait v8bait is offline
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Default 11-05-2018, 05:09 PM

With the tune set property, 90% ethanol can start at about 6*F.

This was a buddy with 87% ethanol in Colorado when we first tested the cold start tables. Not sure if backend flashes have them.

https://youtu.be/mr1YRRLYP28
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Ron Vogel Ron Vogel is offline
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Default 11-05-2018, 08:10 PM

Compression is a factor too. On our motors should start pretty low. I had a GTP on full e85...and it would crank and crank trying to start under 40F. I am in Chicagoland, so I wouldnt try more than e40. those occassional -20f days are a bitch
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hi rpm's Avatar
hi rpm hi rpm is offline
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Default 11-10-2018, 11:31 AM

FYI after overnight low of about 15F, dash reading 23F, it took three tries to start without dying this morning. 50% E.
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Ron Vogel Ron Vogel is offline
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Default 11-12-2018, 12:25 AM

Running e40...started fine. Boost is off the charts though...
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Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
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Default 11-12-2018, 12:54 AM

I kept full e85 in my car for an entire Chicago winter, car never didn’t start.



http://www.fuel-it.biz/

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