E85 anyone?

GodzillaM8 · 06-29-2023, 07:43 AM

Has anyone used E85 gas? I seem to remember reading somewhere that BMW's ECU can actually adjust a bit for ethanol.

ctelimad · 06-29-2023, 09:02 PM

I used a mix E30 on my m8 as a daily for 3 years with jb4 map 2 and never had an issue

Tenac · 07-05-2023, 09:39 AM

It really comes down to what Octane are you wanting to hit? The ECU can adapt pretty well OEM. I have 91 at pumps and at some pumps have 100 so I mix to 93-95 without issues. If you want to run E85 I would recommend tuning to take advantage of it properly. I see you have a 2020 so you might be lucky and simply use a Burger tune simple and affordable. Even better yet get Bootmod3.

Draxxas · 07-05-2023, 10:33 AM

I believe someone shared a while back that the book shows you can run up to E30.
My tuner told me our fuel system is good to E40 do I stay around E33-E34 area. No issues and have around 14k miles on the E30 tune.

06-29-2023, 07:43 AM	#1
GodzillaM8 New Member 41 Rep 12 Posts Drives: 2020 BMW M8, X7 M50i Join Date: May 2023 Location: FL iTrader: (0)	E85 anyone? Has anyone used E85 gas? I seem to remember reading somewhere that BMW's ECU can actually adjust a bit for ethanol.
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06-29-2023, 09:02 PM	#2
ctelimad Lieutenant 388 Rep 401 Posts Drives: bmw m8 Join Date: Jun 2020 Location: nyc iTrader: (0)	I used a mix E30 on my m8 as a daily for 3 years with jb4 map 2 and never had an issue
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07-05-2023, 09:39 AM	#3
Tenac Brigadier General 4603 Rep 3,547 Posts Drives: All Join Date: Mar 2019 Location: AZ iTrader: (0)	It really comes down to what Octane are you wanting to hit? The ECU can adapt pretty well OEM. I have 91 at pumps and at some pumps have 100 so I mix to 93-95 without issues. If you want to run E85 I would recommend tuning to take advantage of it properly. I see you have a 2020 so you might be lucky and simply use a Burger tune simple and affordable. Even better yet get Bootmod3. __________________ 2022 M8 Comp Convertible 2023 718 Cayman GTS 4.0 2019 718 Cayman Base 2015 M235 Manual On the list for the M2 CS Last edited by Tenac; 07-05-2023 at 09:56 AM..
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07-05-2023, 10:33 AM	#4
Draxxas Private First Class 196 Rep 135 Posts Drives: 2019 BMW M850i Join Date: Aug 2021 Location: Indiana iTrader: (0)	I believe someone shared a while back that the book shows you can run up to E30. My tuner told me our fuel system is good to E40 do I stay around E33-E34 area. No issues and have around 14k miles on the E30 tune.
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