N54 Stock DME Flex Fuel
- Thread starter Jake@MHD
- Start date
We have also concluded that the stock MHD OTS Flexfuel maps do not like E85.
Specially after going from an empty tank of 100% pumpfuel to a full tank of E85, the change is too shocking and the car will throw CEL because of lambda codes (2C31, 2C32)
Resetting both lambda adapations after a major fuel type change helped a little bit but eventually codes still come back.
I'm going E50 max for now. Full E85 (really E77 in our case) needs a custom tune so interpolation scales higher.
Specially after going from an empty tank of 100% pumpfuel to a full tank of E85, the change is too shocking and the car will throw CEL because of lambda codes (2C31, 2C32)
Resetting both lambda adapations after a major fuel type change helped a little bit but eventually codes still come back.
I'm going E50 max for now. Full E85 (really E77 in our case) needs a custom tune so interpolation scales higher.
My car did not like flex fuel, it didn't run right for me.
Gave up on it and went stand alone tunes and never gave me problems since.
Gave up on it and went stand alone tunes and never gave me problems since.
I had an issue where my flex fuel value rised with boost. I found that I had pinched the harness on the guard that covers the fuel lines by the short line/steering area and replacing the harness fixed the problem. E54 fuel is reading E52.x
I had one of the first setups. Couple rounds of tuning. Have run from E10 to E80. I run two ECA's on my setup - Fuel-It's and Motiv's. Never seen a problem. I wonder about sensors and wiring with some of the issues.
Filippo
Filippo
i feel like the issue is people are using the OTS maps and expecting it to compensate for ethanol % that no maps were made for
highest mhd map is e60, highest current maps is e50 i think. why would anyone assume that higher ethanol % would read or be possible with off the shelf maps?
want more than e60, custom flex tuning seems fairly necessary.
I have a custom flex fuel tune with hybrids from Ken so that's out of the question. I've mailed Motiv about this issue.
@b4llistic and I seem to have the same issue with the content reading. Although he has ijeOs and I I8a0s.
The OTS maps are not really meant to run full E85. They interpolate correctly up to E50/60, and ALLOW use of up to E85 as a convenience by reducing boost target, etc, while keeping fuel maxed for higher blends. If you really want to run E0 - E85 / 100, you should get a custom tune.
Ok now we are getting somewhere. I've got response from Jake from Motiv and my tuner Ken.
The ethanol content is dictated by the tuner.
In this table .5v = 0% and 3.00v = 100% setting the 4.00v cell is the failsafe so if something happens it runs based on the ethanol content in that cell.
You could set 3.00v to = 20% and it would only scale between 0 and 20%.
I would need to see the file to determine if its a tuning issue and as a rule of thumb tuners do not share files for the most part.
An ethanol sensor is rather accurate so as long as the scaling is set properly in the map then you are golden.
Jake
Yeah, just need to validate content and voltage reading so I can send an update with the voltage change for the breakpoint.
Ken
Next step: mix e85, take a sample from the tank, test the actual e-content and sent the result together with a log for adjustment.
The ethanol content is dictated by the tuner.
In this table .5v = 0% and 3.00v = 100% setting the 4.00v cell is the failsafe so if something happens it runs based on the ethanol content in that cell.
You could set 3.00v to = 20% and it would only scale between 0 and 20%.
I would need to see the file to determine if its a tuning issue and as a rule of thumb tuners do not share files for the most part.
An ethanol sensor is rather accurate so as long as the scaling is set properly in the map then you are golden.
Jake
Yeah, just need to validate content and voltage reading so I can send an update with the voltage change for the breakpoint.
Ken
Next step: mix e85, take a sample from the tank, test the actual e-content and sent the result together with a log for adjustment.
You should never set 3V to 20% E, even if the user was never going to use higher ethanol.
The 3 individual interpolation tables are for dealing with higher E content.
The Voltage to E% table should ONLY be edited it 1.) The user is NOT using the Motiv ECA, or 2.) For some reason their Conti sensor is reading slightly off.
Your case falls into #2. Get your tuner a log of two different ends of the spectrum of E%. Pump gas with E10 and pump E70-85. Make sure to manually test the E%, and also make sure your tank was basically completely full of this fuel. That will probably require two fill-ups of each. Your tuner can then tweak the conversion slightly for your sensor.
The 3 individual interpolation tables are for dealing with higher E content.
The Voltage to E% table should ONLY be edited it 1.) The user is NOT using the Motiv ECA, or 2.) For some reason their Conti sensor is reading slightly off.
Your case falls into #2. Get your tuner a log of two different ends of the spectrum of E%. Pump gas with E10 and pump E70-85. Make sure to manually test the E%, and also make sure your tank was basically completely full of this fuel. That will probably require two fill-ups of each. Your tuner can then tweak the conversion slightly for your sensor.
Max 60% for flex fuel OTS maps and ~85% for custom flex fuel maps with sufficient fuel supply capacity of course.
Hi guys !
I purchased a complete kit from Motiv ( flexfuel ECA + sensor + engine bay kit ) in addition to MHD super licence with FF included.
My car is 2009 335xi N54. Continental sensor installation went well, no leaks in the fuel line. Electrical installation went well too since instructions are clear.
After install i reflashed my current v9.0 RON98 stage1+ map with flexfuel option checked.
Unfortunately, the MHD app read always 100% ethanol. So i looked interpolation which is also 100% and ECA voltage which reads 4.32V.
At this time, i didn't install the upgraded LPFP + secondary LPFP + harness for hobb switch (i read somewhere that some relays can make the ECA reads wrong when WOT, that's why i mention it). Only parts i have installed are : Wagner Evo 3 competition FMIC, and forge charge pipe + BOV.
I also read that typical ECA voltage range is 0.5-3.0V, and voltage over that numbers are "error codes".
I've triple checked all connections, i even measured voltages with a multimeter but everything seems normal.
Next thing i will try is to check/relocate ground (this wire is really short, so maybe need to extend it)
I also contacted Motiv, i hope they can help me to solve this, but maybe someone has a clue of what's happening ?
Thanks a lot !
I purchased a complete kit from Motiv ( flexfuel ECA + sensor + engine bay kit ) in addition to MHD super licence with FF included.
My car is 2009 335xi N54. Continental sensor installation went well, no leaks in the fuel line. Electrical installation went well too since instructions are clear.
After install i reflashed my current v9.0 RON98 stage1+ map with flexfuel option checked.
Unfortunately, the MHD app read always 100% ethanol. So i looked interpolation which is also 100% and ECA voltage which reads 4.32V.
At this time, i didn't install the upgraded LPFP + secondary LPFP + harness for hobb switch (i read somewhere that some relays can make the ECA reads wrong when WOT, that's why i mention it). Only parts i have installed are : Wagner Evo 3 competition FMIC, and forge charge pipe + BOV.
I also read that typical ECA voltage range is 0.5-3.0V, and voltage over that numbers are "error codes".
I've triple checked all connections, i even measured voltages with a multimeter but everything seems normal.
Next thing i will try is to check/relocate ground (this wire is really short, so maybe need to extend it)
I also contacted Motiv, i hope they can help me to solve this, but maybe someone has a clue of what's happening ?
Thanks a lot !
Last edited:
