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    • BMW N54 COBB AccessPORT Now Supports Alternate Fuels - E85



      COBB Tuning is proud to announce that BMW N54 AccessPORT users can now tune for alternate fuels, such as E85, with the latest updates in AccessTUNER Race and AccessTUNER Pro tuning software. AccessPORT end-users and professional tuners can quickly update AccessPORT maps to accommodate fuels of different specific energy using the newly added Fuel Scalar tables, resulting in proper fuel trims during engine operation. This development opens the door for BMW N54 enthusiasts looking to take advantage of the performance and cost benefits of using E85 and other fuel blends.


      Prior to this development, BMW N54 enthusiasts were limited to the extent they could blend E85 with regular gasoline and still have the engine operate safely within the window that the ECU fuel trims could accommodate. By giving end-users and professional tuners the ability to manipulate fuel scalars on their own, this limitation has been removed, allowing the ECU to operate with alternate fuels in the same way it does with traditional gasoline and maintain fuel trims within a range of 1%-3% while producing impressive power gains with excellent power delivery characteristics.










      A Fuel Scalar table is assigned to each cylinder bank in the AccessTUNER software. For most ECUís, these tables are simple one-dimensional scaling factors that allow the user to adjust the fuel scaling up or down as needed. In the 1M ECU, the fuel scalar tables are two-dimensional 16x16 tables that scale fuel based on engine RPM and load.



      Non-1M ECU Fuel Scalar Table



      1M ECU Fuel Scalar Table


      Due to variation in fuel blends across the country, E85 Off-The-Shelf maps will not be available for download. Instead, the end-user is empowered to tune specifically for the fuel blend at their favorite fuel source using AccessTUNER software and data-logging to ensure proper performance. This also allows the end-user to blend different fuels to their liking and quickly tune for it. The BMW AccessTUNER Help Guide has been updated to include Fuel Scalar table descriptions as well as a reference chart for estimated Fuel Scalar values for different blends of ethanol and gasoline.


      To update AccessTUNER and acquire the latest Fuel Scalar tables, simply open the software, click on Help in the menu bar, select Updates and click Check for Updates. In the pop-up window, check the Beta Software box in the lower right corner. Click the Get Updates button and follow on-screen instructions to complete the software upgrade and start tuning for alternate fuels!


      Software Version
      AccessTUNER Pro: 1.9.1.0-4419
      AccessTUNER Race: 1.9.1.0-4414


      This article was originally published in forum thread: BMW N54 AccessPORT Now Supports Alternate Fuels started by COBB Tuning View original post
      Comments 75 Comments
      1. sharptech's Avatar
        sharptech -
        ok so did what you said. stge2+ but running stock fmic other than that fbo. weird part is on piggys they run stock timing tables but they run 10-14 degrees whereas even running the stock timing table on AP still only getting 6 degrees at most.
      1. lulz_m3's Avatar
        lulz_m3 -
        What were your charge air temps (CAT's)?
      1. lulz_m3's Avatar
        lulz_m3 -
        If you don't have aFMIC you should back the boost down. Aren't you FBO?
      1. sharptech's Avatar
        sharptech -
        Ya I was. Now I'm running the stock one temporarily until my other one is fixed. I figured the e85 might cool it enough. Temps are in the 140s by 4th gear
      1. sharptech's Avatar
        sharptech -
        I must not be getting something. My friend has dp's dual cones and jb4 g5 stock fmic, stock catback and he is running a 50/50mix e85. Still beats me and I am full e85 and stge2+agr. So on his logs he runs approx. 10 degrees timing to 13 degrees and about 17psi falling to 15psi. So why when I put my car to stock timing table and load to 172 my car is getting 6 degrees timing and 17psi to 12.8 at redline? but he gets no knock at all and I get 3 here and there.
      1. Carl Morris's Avatar
        Carl Morris -
        So is your confusion about why he's faster, or why he can run more timing and not see any knock events?
      1. sharptech's Avatar
        sharptech -
        kinda both, and why when I run stock timing table on AP why I'm not getting 10-14degrees like jb4? Cuz jb4 runs stock timing table right?
      1. Dfv2's Avatar
        Dfv2 -
        Stock main timing table is quite low on timing for the actual loads you hit on Stg2+ agg. Look at the table and compare your logs of load actual and rpm to the table, you're likely riding the right most column.
      1. rader1's Avatar
        rader1 -
        Click here to enlarge Originally Posted by Dfv2 Click here to enlarge
        Stock main timing table is quite low on timing for the actual loads you hit on Stg2+ agg. Look at the table and compare your logs of load actual and rpm to the table, you're likely riding the right most column.
        This.
        By the sound of it you copy and pasted the stock timing map and pasted it into the stage 2+ timing table. That's not going to work. You've got to trace where your actual loads are and make corrections in those columns
      1. sharptech's Avatar
        sharptech -
        So I would post the log but bimmerboost wont let me. so if I command 175 load at 5k rpms and I'm only getting 162 I need to raise timing in that cell to bring load up? maybe I'm all backwards lol. I came from hptuners on a corvette and this is all backwards. But ya that's what I did was just copy paste stock table
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by sharptech Click here to enlarge
        So I would post the log but bimmerboost wont let me.
        Why not?
      1. sharptech's Avatar
        sharptech -
        cant post a .csv file
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by sharptech Click here to enlarge
        cant post a .csv file
        Forum doesn't support that extension. Zip it then post it or upload a pic of the log.
      1. sharptech's Avatar
        sharptech -
        ok heres log
      1. Sticky's Avatar
        Sticky -
        There you go.