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2Addicts | BMW 2-Series forum Technical Topics N55 (M235i) Engine, Transmission, Exhaust, Tuning Will my car be ok if i fill up E85 from the pump if it's testing a less than 85?

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      07-21-2021, 10:18 PM   #1
white_f22
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Will my car be ok if i fill up E85 from the pump if it's testing a less than 85?

hi so i was wondering, so i wanna run the e30 tune on bootmod3 but people are saying that in arizona, e85 is more like e60 or so. I'm in a FB group that shows ethanol tests from gas stations from the past 2 days at pumps and some are testing like 90-100 or so, so i might try those stations and the tests were from 2 days ago. i'm just kinda nervous anyway about filling it up. I wanted to fill up before my ethanol tester comes so i can test out the tune. If the E85 was like E60, would anything happen to my car if i only run it the first time as that? (people have posted pics of test kits of the pump testing 85+ from the past 2 days at stations around me so i was thinking of using that just for the time being just once)

Thank you!!
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      07-22-2021, 11:28 AM   #2
ctt300
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Just use an E85 mix calculator and change the Ethanol percent to whatever percentage that station tested to.

Google E85 calc


Also tunes adjust timing if sense knock, so drive easy for 5 miles or so and then you can go full throttle for it to learn octane/knock threshold.

Last edited by ctt300; 07-22-2021 at 11:34 AM..
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      07-22-2021, 12:40 PM   #3
white_f22
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Quote:
Originally Posted by ctt300 View Post
Just use an E85 mix calculator and change the Ethanol percent to whatever percentage that station tested to.

Google E85 calc


Also tunes adjust timing if sense knock, so drive easy for 5 miles or so and then you can go full throttle for it to learn octane/knock threshold.
what if i don't know the exact ethanol content? like what if on the FB group it tested at 85 1-2 days ago but now it's at like e60? How often do they get new shipments like should i ask when their last shipment was and when they're getting the next one?
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      07-22-2021, 12:59 PM   #4
white_f22
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Quote:
Originally Posted by ctt300 View Post
Just use an E85 mix calculator and change the Ethanol percent to whatever percentage that station tested to.

Google E85 calc


Also tunes adjust timing if sense knock, so drive easy for 5 miles or so and then you can go full throttle for it to learn octane/knock threshold.
the FB group showed multiple pics yesterday of it testing at 85-90 and i called and they haven't re filled it yet and they get it from the same supplier everytime. Do you think it would be ok to fill up there for the first time until i get my kit? And even if it tested at 90, should i still put in to the calculator it's 85% just to be safe?
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      Yesterday, 10:13 AM   #5
ctt300
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Yes, go ahead and use it and log and it should do fine if this has been tested by others.
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