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2Addicts | BMW 2-Series forum Technical Topics B58 (M240i) Engine, Transmission, Exhaust, Tuning MHD Flex Fuel Kit, mixing E85 with 91oct B58

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      10-29-2023, 11:34 AM   #1
nrg2k
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Hey forums,

I live in AZ, we have pretty poor fuel to choose from out here. Highest pump gas is 91oct, sometimes you can find 100oct. I want to start running E40 as I got the TU Pump for my F22 240. Iíve been considering buying the MHD Flex Fuel kit for the convenience factor, but if I remember right I seen a Kern417 video where he mentioned the kit doesnít read 91 Oct. Is that still true? Would I just limited to Stage 2, and not stage 2+ because I canít mix the E85 with 93?

Also, if I were to throw 100oct in the car, would the MHD Stage 2+ 95oct OTS tune be safe for the fuel I am running?
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      10-29-2023, 08:18 PM   #2
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Quote:
Originally Posted by nrg2k View Post
Hey forums,

I live in AZ, we have pretty poor fuel to choose from out here. Highest pump gas is 91oct, sometimes you can find 100oct. I want to start running E40 as I got the TU Pump for my F22 240. Iíve been considering buying the MHD Flex Fuel kit for the convenience factor, but if I remember right I seen a Kern417 video where he mentioned the kit doesnít read 91 Oct. Is that still true? Would I just limited to Stage 2, and not stage 2+ because I canít mix the E85 with 93?

Also, if I were to throw 100oct in the car, would the MHD Stage 2+ 95oct OTS tune be safe for the fuel I am running?
You can mix e85 with your garbage 89 (fake 91).. you just have to use more e85 to compensate.. you'll wanna run about e45 to run the e40 mhd map.
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      10-31-2023, 07:49 AM   #3
marcthedark
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Quote:
Originally Posted by n55david View Post
You can mix e85 with your garbage 89 (fake 91).. you just have to use more e85 to compensate.. you'll wanna run about e45 to run the e40 mhd map.
But the OP wanted to use the flex fuel kit. That obviously measures E in the tank but not if the rest is 93 or crappy 91 > will the timing be OK as the Arizona 91 might lead to pull
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      11-02-2023, 12:58 AM   #4
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I've ran E30 on my stock tune (with a boost controller) just to make the 93 setting run smooth. I'm tempted to suggest you just run an aggressive 93 tune on E40 and go back to a 91 tune when you can't get your hands on E85.
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