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Looking for a custom tune via BM3 (DP, CAI, E85).

Discussion in 'DME / ECU Software Tuning' started by Camus, Feb 1, 2020.

  1. 7sstreet

    7sstreet Member

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    I’ve put on 140k+ miles on my 340i and still drive it with an E40 custom tune whenever I can manage to fill up. I’ve never heard of any major injectors getting stuck issues other than on some V8s but that’s pump gas even stock cars have it happen. Your tuner is most likely right and it has nothing to do with ethanol let alone his tune. Injectors on these cars are nothing new. They’ve been used for a long time now.
     
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  2. La6ri

    La6ri New Member

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    I belive that there's a pretty big difference between running E40, essentially a mix with regular gas and pure E85.
    after consulting with several BMW tech it kinda boils down to the following, plenty of advantages to E85, higher octane , runs cooler etc BUT in order to make it work on a stock fuel system it requires significant ( cca. 50% or more) fuel pressure increase.
    Now, the stock fuel system is capable delivering those pressures it seems but once it hits the solenoid of a Fuel injector it not always able to handle those increased pressures and it can simply stay stuck in the open position.
    We reviewed the data logs from my track sessions running E85 and it does show high fuel pressure in the system.
    Again, my $3400 mishap happened within first few laps of my first track session on E85.
    I have done a ton of track time on 93 in this car past 4 years and NEVER had an issue.
    So, some deductive logic here is quite straightforward especially coupled with very sound and plausible explanation furnished by those in the know, i.e BMW master tech.
    I am not speaking out against any particular tuners, I didn't even bother naming mine just mentioned he's one of the big names in the biz.
    This is just a little cautionary tale that I used to to shed some light on the flip-side of that E85 coin.
    Maybe, if you don't ask too much of the car (no track) , do highway and occasional pulls with your buddies at local car meets this setup might work for you long term, otherwise if you value reliability for an expensive track weekend you paid I would NOT recommend at all unless coupled with something like Port injection to allow those Fuel pressures to stay somewhere closer to OEM settings. just my 2 cents ( $3400 actually, that's what my repair cost and your "tuner" will tell you- good luck buddy, hope you get it fixed, come back for some more maps so I can experiment my R&D on your car )
    It's all in the name of good fun fellaz.
     
  3. 65sohc

    65sohc Well-Known Member

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    One of the scenarios put forth is that because of ethanol's superior cleaning properties, if e85 is introduced into a fuel system that has run for years on pump gas it may do too good a job of cleaning the deposits that have built up and clog the injectors. I tuned my Shelby early on for e85 and it ran flawlessly for four years. I followed Ford's recommendation for flex fuel vehicles and ran a tank of normal gas every month or so.
     
  4. La6ri

    La6ri New Member

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    That might also be one of the scenarios...who knows, but regardless issues exist and reliability is impacted.
    You could pick up a brand new car and go convert to E85 asap (most likely losing any factory warranty you have) before it
    develops any hypothetical buildups in in the system that e 85 might later dislodge, but that's hardly a solution.
    I have for my part cycled 93 and E85 during the brief period I run it as per Tuners recommendation, actually even a bit more often and kept the tank full with E85 at all times to prevent any potential H2O getting into the system due to e85's hygroscopic tendencies. All to no avail...
    At the end, I DID like the E85 power and would consider it again but only as a part of a bigger tune job involving port injection and few other goodies so it's somewhat of a reliable setup and I don't feel like I'm throwing dice every time I line up at the grid to do some hot laps...
     
  5. 65sohc

    65sohc Well-Known Member

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    I drove Mustangs for 15 years prior to getting my Supra. There is a forum on svtperformance.com entitled "the Distillery", assuming you catch the drift, with 14.035 posts. 99.9% of them are positive.
     
  6. La6ri

    La6ri New Member

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    I get it. it's funny... listen, I never owned a Mustang, raced against plenty of them and they are sturdy built machines but no first hand knowledge.
    Heck, they're probably folks on that forum that figured out how to run those cars on some homemade moonshine, those big blocks being a lot more forgiving than this german/Japanese alliance. Anything stronger than beer/sake not gonna work...
    All joke on the side, my experience is limited to several M platforms over the years and they can be somewhat of a finicky machines when fed the wrong stuff.
    I sincerely hope you don't find out and have a smooth sailing feeding corn to your new Supra... good luck.
     
  7. 7sstreet

    7sstreet Member

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    Robert
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    Running on custom BM3 map with E40 now its unreal! Power is so smooth everywhere. It seems to put the power down better than my 340i with same type of tire. I added the strut braces which may help but wow, impressed
     

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