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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > BMW N54 AccessPORT Now Supports Alternate Fuels



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      07-25-2012, 06:59 PM   #1
COBB Tuning
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BMW N54 AccessPORT Now Supports Alternate Fuels


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 ECU’s, 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


Last edited by COBB Tuning; 07-25-2012 at 08:34 PM.
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      07-25-2012, 07:04 PM   #2
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Nice! I especially like the fuel source!
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      07-25-2012, 07:15 PM   #3
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Amazing
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      07-25-2012, 07:15 PM   #4
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      07-25-2012, 07:27 PM   #5
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Awesome! I wonder...what was the highest E85 content Cobb tested?
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      07-25-2012, 07:46 PM   #6
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Perfect timing. I was just messing with some things today that the ecu just keep adjusting for.

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      07-25-2012, 07:50 PM   #7
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I'm really jealous of the 1M fuel scalar tables. Any chance of the I8AOS seeing that?
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      07-25-2012, 08:00 PM   #8
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great !!!

update done !!!

thank you COBB !!!
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      07-25-2012, 08:37 PM   #9
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Cobb is finally living up to their name
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      07-25-2012, 08:41 PM   #10
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It appears ProTuningFreaks helped Cobb bring this idea to fruition quicker than anyone would have liked. Flylow335 is responsible.
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      07-25-2012, 09:06 PM   #11
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Good work!

However, two main issue remain that deal with the long term reliability of the fuel system components when E85 is used:

1. A prominent engineer from Bosch who worked on the N54 fuel system stated that the injectors are likely to fail when ethanol is heated to more than 100 degrees Centigrade. Therefore, he deems E85 unsuitable as a fuel for the N54 fuel system components.

2. We are yet to observe the long term effects of E85 on the HPFP. Yes, there is a recall, software update and a 10 year, 120K mile warranty on that item, but still, this can be a potential issue considering that mixing E85 with conventional fuel will increase the fuel demand by volume.
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      07-25-2012, 09:09 PM   #12
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Thumbs up for proper tuning. Thanks to Cobb and ProtuningFreaks for making this possible!
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      07-25-2012, 09:31 PM   #13
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In those two graphs, lambda is on the left axis and trims are on the right?
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      07-25-2012, 09:40 PM   #14
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So this is just for Protunes or if you can do the tune yourself correct? Will there be blended % OTS tunes soon? Like a Stage 2 Aggressive + FMIC + 30% E85 or something?

Awesome though!
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      07-25-2012, 10:01 PM   #15
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Great news! Cant wait to get my AP.
Seems like COBB AP + PTF Tuned is the way to go right now...Great work!
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      07-25-2012, 10:07 PM   #16
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So much joy, thank you thank you!!!
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      07-25-2012, 10:09 PM   #17
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Spectacular. Hilarious pictures too
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      07-25-2012, 10:41 PM   #18
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Those pictures had me rolling on the floor, so hilarious haha, nice work Cobb!
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      07-25-2012, 10:59 PM   #19
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Very nice, but is there any chance of a 20-30% E85 OTS map?? I really am not very technical to make my own edits and adjust for the E85. I would like to load up an E85 map and forget about it.
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      07-25-2012, 11:07 PM   #20
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Quote:
Originally Posted by new2the3 View Post
Very nice, but is there any chance of a 20-30% E85 OTS map?? I really am not very technical to make my own edits and adjust for the E85. I would like to load up an E85 map and forget about it.
i doubt they want to do this and have to worry about someone using e70 winter blend and having major problems
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      07-25-2012, 11:15 PM   #21
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Quote:
Originally Posted by saxon View Post
i doubt they want to do this and have to worry about someone using e70 winter blend and having major problems
If I can currently run 20% E85 OK with the OTS Stage 1 maps, I don't see why it would be so difficult to make another map that would be better optimized for E85 use.
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      07-25-2012, 11:18 PM   #22
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Quote:
Originally Posted by new2the3 View Post
Very nice, but is there any chance of a 20-30% E85 OTS map?? I really am not very technical to make my own edits and adjust for the E85. I would like to load up an E85 map and forget about it.
Read last paragraph of original post.
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