THE LARGEST BMW 2-SERIES FORUM ON THE PLANET
2Addicts
2Addicts
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
2Addicts | BMW 2-Series forum Technical Topics B58 (M240i) Engine, Transmission, Exhaust, Tuning MHD Flex Fuel

Post Reply
 
Thread Tools Search this Thread
      06-29-2022, 10:07 AM   #1
marcthedark
Lieutenant
120
Rep
407
Posts

Drives: M240i xdrive Convertible
Join Date: Apr 2017
Location: Phoenix Metro Area

iTrader: (0)

MHD Flex Fuel

Hi,

As I moved to Arizona I now have to deal with crappy gas, but have an E85 station reasonably close.
To keep it daily driver simple and being able to fill up anywhere the MHD Flex Fuel solution sounds great.
I have MHD Stage 2 (no logging license as I didnít have the time to really get into it) so it seems as if I only need:
A) TU Fuel pump
B) MHD FlexFuel Analyzer Kit
Install , change Flash to Flex Fuel with the slots 91/93/95/2+ 95
Is it that easy?
Appreciate 0
      06-29-2022, 10:47 AM   #2
JMcLellan
Captain
JMcLellan's Avatar
United_States
1685
Rep
977
Posts

Drives: 2024 M2
Join Date: Mar 2022
Location: MN

iTrader: (0)

Quote:
Originally Posted by marcthedark View Post
Hi,

As I moved to Arizona I now have to deal with crappy gas, but have an E85 station reasonably close.
To keep it daily driver simple and being able to fill up anywhere the MHD Flex Fuel solution sounds great.
I have MHD Stage 2 (no logging license as I didnít have the time to really get into it) so it seems as if I only need:
A) TU Fuel pump
B) MHD FlexFuel Analyzer Kit
Install , change Flash to Flex Fuel with the slots 91/93/95/2+ 95
Is it that easy?
What are your goals for running flex fuel? TU pump is needed if you want to run anything over E25/E30 blend on the Gen 1 B58. I've been running 3 gallons of E85 in my tank (E23 blend) and have had some fuel rail pressure drops and trims getting high with both the JB4 tune I had and now with MHD stage 2 93 octane.

I recommend being able to data log and send to experts for review. Jump to different maps and check out the metrics.

But getting the TU pump installed will remove a lot of the worry and hassle with getting the Gen 1 B58 dialed in on stage 2 and beyond maps. The flex fuel kit would be super convenient for seeing your E-reading. I've just been doing the math every fill up.
__________________
2024 M2
2019 M240i- Sold
Appreciate 0
      06-29-2022, 06:40 PM   #3
marcthedark
Lieutenant
120
Rep
407
Posts

Drives: M240i xdrive Convertible
Join Date: Apr 2017
Location: Phoenix Metro Area

iTrader: (0)

And the flex. fuel kit would talk to the MHD tune which then would select the appropriate map.
A set and forget option IF my understanding is correct.
Appreciate 0
      07-06-2022, 07:15 PM   #4
AleksanderSuave
Lieutenant
193
Rep
453
Posts

Drives: 2017 M240iX Coupe
Join Date: Sep 2015
Location: Detroit

iTrader: (1)

Running MHD Flex Fuel kit on mine.

yes its as easy as it sounds. TU Pump and Flex fuel Kit install can be done at the same time to not repeat extra steps.
Appreciate 0
      07-07-2022, 02:12 PM   #5
marcthedark
Lieutenant
120
Rep
407
Posts

Drives: M240i xdrive Convertible
Join Date: Apr 2017
Location: Phoenix Metro Area

iTrader: (0)

Quote:
Originally Posted by AleksanderSuave View Post
Running MHD Flex Fuel kit on mine.

yes its as easy as it sounds. TU Pump and Flex fuel Kit install can be done at the same time to not repeat extra steps.
Now I only have to find a installer in Glendale, AZ (Phoenix Metro Area). Not AZ Euro as they would not work on parts I bring to be installed.
Appreciate 0
      07-09-2022, 10:07 AM   #6
Jnat
DisplacementReplacement
Jnat's Avatar
329
Rep
1,051
Posts

Drives: 2020 X3M
Join Date: Sep 2012
Location: Jersey Shore

iTrader: (0)

Quote:
Originally Posted by AleksanderSuave View Post
Running MHD Flex Fuel kit on mine.

yes its as easy as it sounds. TU Pump and Flex fuel Kit install can be done at the same time to not repeat extra steps.
Are you happy with the results after installation?
Have you done any logging to see how the numbers look based on whatever mix you're running?
__________________
2020 X3M /// MHD Tune
Prior Bimmers
2017 240XI Hybrid / FBO / MHD E40
2015 235XI FBO / MHD E30
2009 335XI FBO / COBB / E30
Appreciate 0
      07-20-2022, 04:21 PM   #7
marcthedark
Lieutenant
120
Rep
407
Posts

Drives: M240i xdrive Convertible
Join Date: Apr 2017
Location: Phoenix Metro Area

iTrader: (0)

Note:

If you have 91 fuel and want to use FlexFlue then you are limited to Stage 2 even with TU pump. As the 4 slots are filled with the same base map (according to the "how to" video) and there is no 91 Stage 2+ (which in itself would be not needed as fueling is not the limit) and I can't rely on E being available everywhere .....
MHD make a 91 ACN Stage 2+ map just for FlexFuel purposes. This way we are safe at the crappy 91 we get but make use of the TU pump at E40-50 ...
Appreciate 0
      08-15-2022, 09:34 PM   #8
AleksanderSuave
Lieutenant
193
Rep
453
Posts

Drives: 2017 M240iX Coupe
Join Date: Sep 2015
Location: Detroit

iTrader: (1)

Quote:
Originally Posted by Jnat View Post
Are you happy with the results after installation?
Have you done any logging to see how the numbers look based on whatever mix you're running?
Initially I had 2 issues.

1. flex fuel map was limited to stage 2 tune (not 2+ which is more powerful for HPFP so I was basically running a less than desirable map)

2. It threw some odd codes.

Both were resolved pretty quickly, the flex fuel analyzer needed a firmware update (pretty simple) - I contacted MHD on facebook and had a fix basically within an hour, and MHD released 2+ flex fuel map update maybe a week after that.

Im very happy so far. I fill up primarily at only 1 station so my usual estimate lands me right at e42 or so, but still peace of mind because when traveling across the state, or further, because its sometimes its harder to find an e85 station, and I didnt want to deal with the hassle of re-flashing a 93 octane map, then getting home, refueling, reflashing an e40 map again.

Its mostly peace of mind but yes, I would say I am happy and it is worth it.

The install is incredibly simple. I would say easier than downpipe both in tools required and in overall labor.

Its basically replacing a fuel line, unplugging a DME cable to add in the extension, and routing a few wires after. The majority of the time spent is on disassembly (you need to basically do the entire top disassembly as you would for a spark plug job, removing strut brace, foam, all the fun stuff)
Appreciate 0
      08-17-2022, 09:14 PM   #9
Jnat
DisplacementReplacement
Jnat's Avatar
329
Rep
1,051
Posts

Drives: 2020 X3M
Join Date: Sep 2012
Location: Jersey Shore

iTrader: (0)

Quote:
Originally Posted by AleksanderSuave View Post
Initially I had 2 issues.

1. flex fuel map was limited to stage 2 tune (not 2+ which is more powerful for HPFP so I was basically running a less than desirable map)

2. It threw some odd codes.

Both were resolved pretty quickly, the flex fuel analyzer needed a firmware update (pretty simple) - I contacted MHD on facebook and had a fix basically within an hour, and MHD released 2+ flex fuel map update maybe a week after that.

Im very happy so far. I fill up primarily at only 1 station so my usual estimate lands me right at e42 or so, but still peace of mind because when traveling across the state, or further, because its sometimes its harder to find an e85 station, and I didnt want to deal with the hassle of re-flashing a 93 octane map, then getting home, refueling, reflashing an e40 map again.

Its mostly peace of mind but yes, I would say I am happy and it is worth it.

The install is incredibly simple. I would say easier than downpipe both in tools required and in overall labor.

Its basically replacing a fuel line, unplugging a DME cable to add in the extension, and routing a few wires after. The majority of the time spent is on disassembly (you need to basically do the entire top disassembly as you would for a spark plug job, removing strut brace, foam, all the fun stuff)
Thank you for that feedback and sounds like your happy with it! I've been running E on a few different platforms since 09 and been doing it the old fashioned way lol... with good results... but, maybe it's time to stop the measuring... and join the most current tech...
__________________
2020 X3M /// MHD Tune
Prior Bimmers
2017 240XI Hybrid / FBO / MHD E40
2015 235XI FBO / MHD E30
2009 335XI FBO / COBB / E30
Appreciate 0
      10-11-2023, 06:15 AM   #10
aemreisl
New Member
aemreisl's Avatar
Turkey
5
Rep
7
Posts

Drives: BMW M240İ XDRİVE
Join Date: Apr 2022
Location: İstanbul

iTrader: (0)

I also run flex fuel in my car. but every time I get zero timing correction. i use mhd ots map. I think the car is operating below its potential.
Appreciate 0
      10-11-2023, 09:13 PM   #11
n55david
Check out my Youtube @n55david!
n55david's Avatar
1251
Rep
3,442
Posts

Drives: 2017 m240i, 2015 X3 x35i
Join Date: Aug 2018
Location: Michigan USA

iTrader: (0)

Garage List
2017 m240i xDrive  [0.00]
2015 X3 x35i  [0.00]
2015 335i xdrive  [0.00]
Quote:
Originally Posted by aemreisl View Post
I also run flex fuel in my car. but every time I get zero timing correction. i use mhd ots map. I think the car is operating below its potential.
In a perfect world you'd get no corrections
__________________
2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD
2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots
IG: @n55david For pics and updates!
Youtube: @ n55david For videos or Racing etc
Appreciate 0
      10-12-2023, 06:09 AM   #12
aemreisl
New Member
aemreisl's Avatar
Turkey
5
Rep
7
Posts

Drives: BMW M240İ XDRİVE
Join Date: Apr 2022
Location: İstanbul

iTrader: (0)

I live in istanbul. Gasoline quality is very low here. I think the ignition timing is too low on flex fuel on OTS maps. or mhd eca kit keeps trying to get 0 timing correction. I still haven't figured out how it works.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 08:53 PM.




2addicts
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST