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N54 Stock DME Flex Fuel

Discussion in 'N54' started by jyamona, Jan 11, 2017.

  1. jyamona

    jyamona Corporal Vendor

    Hey guys,

    The time has finally come to share some details on my secret N54 project. It's been under development for many months now, and had no shortage of both hardware and software (mainly software smile.gif ) obstacles to overcome. That said, a major milestone was reached this week so it's time to let you all in! Coming soon to a stock DME near you:


    Yep, real Flex Fuel. It is a fully implemented flex fuel solution, running on the stock DME! Dial your car in on pump (91-93oct), then E85, set the blending / interpolation curve tables, and be on your way. The benefits here are never having to reflash when changing ethanol blends again (or even worry about mixing the correct blend). Go from straight 93oct to 100% E85 or E98 on the same flash smile.gif

    This is up and running on a few IJE0S cars now and works flawlessly. There is still some more work to be done, and of course porting to the other ROM types will take a good bit of time. Some hardware details are in need of finalization as well. More to come on those items in the weeks to follow.

    Some overall highlights and features of this accomplishment:

    • first DME integration with a 3rd party sensor
    • first large scale rewrite and modification of DME logic
    • direct logging of Ethanol Content % in MHD
    • separate blending / interpolation per table grouping
    • seamless blending between maps for any ethanol content

    I'd also like to give a big thanks to @CKI for his help in testing and flashing my countless revisions at all hours of the day, and also to @[email protected] for assembly code and hex conversion help along the way! In case you haven't guessed, this will be a module available in MHD similar to M-Boost.

    A thread is worthless without pics, right? This log was taken after a fill-up to a higher E content, and you can see the AFR target rising as E% goes up. 2017 is just getting started, and will definitely be the year of the stock DME ;)

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  2. Shane303

    Shane303 Specialist

    Mesa, Arizona
    2009 E92 335i
    WOW, great work!!!
  3. 1and1

    1and1 Private

    spiffy business right here! Nice job to all involved!
    After years of careful fuel blending to stay consistent it'll be nice to just fill & go
  4. doublespaces

    doublespaces Administrator

    2009 E93 335i
    This is such badass news! I can now go fill up with ethanol whenever I get a chance... Major props!

    So I assume the process is the same even if you run a different blend, like E54 for example but the blending tables will be different?

    Because I don't know if I can even get my hands on E85 in AZ anymore.
  5. CKI@Motiv

    [email protected] Specialist Vendor

    As always Phenomenal work Jake and Martial. It was well worth the 8+hrs of flashing in the past few days.
    To add some notes. I have had an E sensor wired into my DME for over 6 months and i have played with many mixtures. The DME's response in adapting to mixture changes is incredible. 60% changes in mixture on the same fuel scalar during just cruise and the DME responds quickly. There was a lot of preliminary testing and it all passes unnoticed. So that coupled with an active fuel scalar will be even better.
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  6. Omar@VaderSolutions

    [email protected] Sergeant Vendor

    NY & AZ
    N54 135i & N54 335i
    Standalone lol
  7. doublespaces

    doublespaces Administrator

    2009 E93 335i
    Also, what is the 'input' for the flex fuel sensor to the DME?
  8. jyamona

    jyamona Corporal Vendor

    Where we're going, we don't need standalones.

    Right now it's flex fuel sensor -> custom ethanol content analyzer -> DME pin
  9. Joe

    Joe Specialist

    So this is why Jake, Chris and Jake all laughed at my comment the other day. Beautiful work. Any chance this can be added to a gpio on my ems4? Or haltech for that matter?

    I also assume that PI driven by AIC would have the same problem, but one harder to solve.
  10. doublespaces

    doublespaces Administrator

    2009 E93 335i
    So, when does it go on sale/beta testing?
  11. Any hope for N55 applications?
  12. CKI@Motiv

    [email protected] Specialist Vendor

    Yeah it was tough to hold in sorry, Theres several ways of solving the PI issue. The main idea was making sure we could get the DME to do what we wanted before investing more time into some of the other things. Now that the DME is 100% happy and cooperative we can now go through with making it a 100% complete kit.
  13. Aaron

    Aaron Sergeant

    Silver 2013 335is 6MT
    In for dates on when it's for sale!
  14. V8bait

    V8bait Sergeant

    Excellent work all!
  15. zmon1300

    zmon1300 Specialist

    '10 335xi
    Awesome! When is this going to be available for public use?!
  16. Erichale77

    Erichale77 Sergeant

    Clearwater, FL
    07 E92 coupe
    Awesome work guys!!!
  17. Kervio

    Kervio Private

    This is amazing work! Need beta testers? :p:)
  18. klooney

    klooney Specialist

    In for beta testing
  19. When this is working correctly with PI I will be switching to this with a MOTIV Boost Box. Going to be a killer combo! I will miss the gauge hijacking of my JB4 but this will make life way easier...