[E92TiAg335i]

Hey guys. I have a 2013 e92 335i n55 FBO 6mt with a JB4.

For the longest time, i was trying to find a shop to unlock my DME. After searching forever, i finally one...

My next question is should i get the full blown MHD flash?



My following questions are:


If so, do i go stage 2+ but 93 only? I like to run e85 (and therefore the flexibility of jb4) but i don't like to daily on e85 as i drive 35 miles each way for work.

Do i also need to "unlock" my computer everytime an update for MHD comes out?

Will unlocking my DME destroy anything in the long run?

Is the backend flash and jb4 together any good?

I've also heard how people run into issues when stacking MHD and jb4.

Thanks in advance!

[Turbod]

Originally Posted by E92TiAg335i

Hey guys. I have a 2013 e92 335i n55 FBO 6mt with a JB4.

For the longest time, i was trying to find a shop to unlock my DME. After searching forever, i finally one...

My next question is should i get the full blown MHD flash?



My following questions are:


If so, do i go stage 2+ but 93 only? I like to run e85 (and therefore the flexibility of jb4) but i don't like to daily on e85 as i drive 35 miles each way for work.

Do i also need to "unlock" my computer everytime an update for MHD comes out?

Will unlocking my DME destroy anything in the long run?

Is the backend flash and jb4 together any good?

I've also heard how people run into issues when stacking MHD and jb4.

Thanks in advance!

In my opinion you should pull the JB4 and run MHD only. I have not used one of the OTS tunes so I will not comment on those. Once you unlock your DME as long as you don't flash back to stock or let BMW flash the car then it will not need to be unlocked again. If the shop you're taking it to has to open the DME to bench flash it then the only thing I would worry about would be if they sealed it well enough.

MHD updates to not require another unlock, nor does changing your map.

Pick a concentration of E85 you like and get a tune for that concentration. You can flash at the pump to which ever tune you want to run.

People that have issues with the BEF I have heard were primary them trying to flash the DME while the JB4 is connected.

The JB4 isn't great but the BEF make it better.

[E92TiAg335i]

Originally Posted by Turbod

In my opinion you should pull the JB4 and run MHD only. I have not used one of the OTS tunes so I will not comment on those. Once you unlock your DME as long as you don't flash back to stock or let BMW flash the car then it will not need to be unlocked again. If the shop you're taking it to has to open the DME to bench flash it then the only thing I would worry about would be if they sealed it well enough.

MHD updates to not require another unlock, nor does changing your map.

Pick a concentration of E85 you like and get a tune for that concentration. You can flash at the pump to which ever tune you want to run.

People that have issues with the BEF I have heard were primary them trying to flash the DME while the JB4 is connected.

The JB4 isn't great but the BEF make it better.

Yeah, i understand that. But i'd rather not do the whole flash thing. Having JB4 is just too easy for e85. I don't mind not running e85 altogether if i won't be able to anymore.

What if i added e85 while only on the 93 stage 2+ map?

[Turbod]

Originally Posted by E92TiAg335i

Yeah, i understand that. But i'd rather not do the whole flash thing. Having JB4 is just too easy for e85. I don't mind not running e85 altogether if i won't be able to anymore.

What if i added e85 while only on the 93 stage 2+ map?

Sounds like you answered your own question. The run the pump BEF until your ethanol mixture is E40 or higher.

[E92TiAg335i]

Originally Posted by Turbod

Sounds like you answered your own question. The run the pump BEF until your ethanol mixture is E40 or higher.

Ok... just trying to understand... if i run ONLY MHD stage2+ pump flash, can i still add e85 and will i see any benefits?

[Turbod]

Originally Posted by Turbod

I have not used one of the OTS tunes so I will not comment on those.

Originally Posted by E92TiAg335i

Ok... just trying to understand... if i run ONLY MHD stage2+ pump flash, can i still add e85 and will i see any benefits?

So the direct answer, no. The fuel tables are setup for pump gas, not ethanol. There will be a little leniency with this but if you want to use more than 10% ethanol you should get a tune for your ethanol mixture.

Ethanol itself will not give you more power. What it gives you is the ability to run more boost and or timing without running into knock. The reason E30 is such a popular mixture for this platform is because it still provides good knock suppression without being overly taxing on your fuel system. If you're wanting to run full E85 then you will need an upgraded LPFP and an upgraded HPFP. You could add one gallon of E85 to your full tank and run the stage 2 +. This would ensure that you have no timing corrections and give you the most power while using that tune.

We have the same HPFP and I found that the fuel system started to crash around 17 psi, using the stock flash fuel tables, when I was running E25.

[Fuel-It!]

Originally Posted by E92TiAg335i

Hey guys. I have a 2013 e92 335i n55 FBO 6mt with a JB4.

For the longest time, i was trying to find a shop to unlock my DME. After searching forever, i finally one...

My next question is should i get the full blown MHD flash?



My following questions are:


If so, do i go stage 2+ but 93 only? I like to run e85 (and therefore the flexibility of jb4) but i don't like to daily on e85 as i drive 35 miles each way for work.

Do i also need to "unlock" my computer everytime an update for MHD comes out?

Will unlocking my DME destroy anything in the long run?

Is the backend flash and jb4 together any good?

I've also heard how people run into issues when stacking MHD and jb4.

Thanks in advance!

The major expense of JB4 + MHD is the JB4 itself. If you already have that you are best off taking advantage of the free JB4 flash maps. For moving between pump and E85 mixture the RACE flash is a good starting point. You can select map5 and let JB4 auto tune based on the E85 mixture then or manually move between different boost profiles in dash based on the fuel.

[E92TiAg335i]

Originally Posted by Fuel-It!

The major expense of JB4 + MHD is the JB4 itself. If you already have that you are best off taking advantage of the free JB4 flash maps. For moving between pump and E85 mixture the RACE flash is a good starting point. You can select map5 and let JB4 auto tune based on the E85 mixture then or manually move between different boost profiles in dash based on the fuel.

Originally Posted by Fuel-It!

The major expense of JB4 + MHD is the JB4 itself. If you already have that you are best off taking advantage of the free JB4 flash maps. For moving between pump and E85 mixture the RACE flash is a good starting point. You can select map5 and let JB4 auto tune based on the E85 mixture then or manually move between different boost profiles in dash based on the fuel.

So you're saying use the BEF and keep my JB4?