[tht_one_335i]

Hello! Does anyone know if MHD and JB4 are compatible? And is mhd a reliable flash tune for a 2010 bmw 335i Xdrive sedan?

[oVeRdOsE.]

yes they are and they work very well together.

- 2 main use with MHD : back end flash or used only to monitor.


You can very tune the car yourself for free.
And of course you can hire a tuner that will create BEF flash map from the JB4 settings and logs.

useful for custom setup; like single turbo, meth, port, etc.

Outdated if you want a ''tune in a can (ots maps)'' on common hardware.

[tht_one_335i]

What if I’m not running anything crazy. Like right now all I’m running power wise is air intake. Would it still be good? And if I adjust the boost up higher what parts can I damage?

[oVeRdOsE.]

Originally Posted by tht_one_335i

What if I’m not running anything crazy. Like right now all I’m running power wise is air intake. Would it still be good? And if I adjust the boost up higher what parts can I damage?

in that case, simply use MHD, buy a OTS premade map (or a package) and flash a stage 1, or higher depending of your mods.

You can buy the monitor license, but expensive, and not that useful if you want a 'flash and forget' tune.

JB4 will bring complexity in your setup, mainly wiring and you might gave issue, and inputs that are not intuitive. While MHD flash the dme, and you dont mess with any wire, and input options are limited and well explained.


When you combine both aka BEF (back end flash), you have huge flexibility to tune your own car with JB4. However, this is not intuitive at all, not much how to, and low support. Can be complicated fast.

I did tune mine based on internet references, and end up hiring a tuner. Still using JB4+MHD, because I had this and it works.

[tht_one_335i]

Also do I have to tune it myself? I want to be able to run stock tune as well and be able to switch on the fly.

[tht_one_335i]

I emailed burger motorsports and they said that jb4 comes with premade maps. Do you have this?

[oVeRdOsE.]

Originally Posted by tht_one_335i

Also do I have to tune it myself? I want to be able to run stock tune as well and be able to switch on the fly.

no, those are premade maps.

you can tune yourself with MHD, by editing .bin file with something like tuner pro, but you need great knowledge . But once again, this is more for uncommon setup and most people will hire a tuner.

yes MHD has an option to switch maps on the fly, I believe there's a cost for this. Download the app and see the options offered.

Originally Posted by tht_one_335i

I emailed burger motorsports and they said that jb4 comes with premade maps. Do you have this?

yes I have premade maps, and they even do single turbo maps , since I'm single turbo this helped me.

For stock or FBO 335 , here the maps (you can switch on the fly) :

Map 0: Stock bypass.
Map 1: 13psi. Suggested for most racing applications.
Map 2: 14.5psi. Suggested for those with intake and other bolt on modifications with 93 RM2 or higher octane.
Map 3: Progressive WMI water injection mapping with failsafe.
Map 4: Stock map w/ CAN active. Allows full logging and in dash gauges on the stock mapping.
Map 5: Autotuning map. Boost ranges between 12-17psi based on your cars octane, conditions, and modifications. E85 compatible. If using E85 we suggest around 30% to start. Refer to the E85 FAQ for addl info. Resets to 93 octane level adaptions when selected and adjusts itself up or down from there.
Map 6: User defined map generally only used for diagnostics or troubleshooting.
Map 7: Race gas map. 18.5psi peak boost on the G5 ISO. Requires straight 100-104+ RM2 octane unleaded racing fuel. Never run leaded fuel. To use this map with E85 requires the E85 back end flash, inline booster fuel pump, and a 40%+ E85 mix, per E85 FAQ.
Map8: Valet low boost map. May trigger 30FF under boost code in cars not also equipped with the back end flash map.


HOWEVER, those are NOT flash ! This does not work like MHD. The jb4 need to intercept the signal, and resend it to trick the car DME. Less precision, slower.

Like I said , it works, but for the price and your needs, you might want to keep it simple. JB4 require installation (not that hard), and MHD require nothing but the dungle.

NOTE : you can use JB4 alone. But if you combine it with a flash (BEF), this will help a lot. So you can use JB4 2 ways, which is really nice.

[tht_one_335i]

Ok well I appreciate it very much and I will probably end up buying it and talking to a few more people and my tuner! Thank you again!

[oVeRdOsE.]

Originally Posted by tht_one_335i

Ok well I appreciate it very much and I will probably end up buying it and talking to a few more people and my tuner! Thank you again!

no matter what, imo, JB4 should be use with BEF, so anyway you'll need a MHD dongle. So start with that. flash a stage 1 map.

If you ever want more option and control, you always can get a used JB4 (gen 5 if possible with bluetooth) and flash a free BEF map to use the most of the JB4.

[tht_one_335i]

Wdym flash a BEF map? I’m confused I thought the mhd is a BEF

[oVeRdOsE.]

Originally Posted by tht_one_335i

Wdym flash a BEF map? I’m confused I thought the mhd is a BEF

it's more called a flash.

Option discussed :

1. MHD alone : only dongle + your phone + purchased MHD maps = flash . https://mhdtuning.com/products/mhd-f...icense-for-n54
2. JB4 alone : included maps that changes OEM dme reading = piggyback .0 https://www.jb4tech.com/forum/model-...series-n54-jb4
3. JB4 + MHD : use JB4 like intended, but you also flash a map (included with JB4) to the DME with the MHD dongle = Back end flash. https://mhdtuning.com/products/n54-jb4-bef-only-flasher + https://www.jb4tech.com/forum/model-...end-flash-maps

[tht_one_335i]

So could I adjust the boost and do launch control and all of that if I have both?

[oVeRdOsE.]

Originally Posted by tht_one_335i

So could I adjust the boost and do launch control and all of that if I have both?

1. MHD alone : yes, under flashing option
2. JB4 alone : yes with an additional chip and relay.
3. BEF : yes, under MHD options.

antilag and launch . Launch only for 6mt, at least for BEF MHD option.

[tht_one_335i]

Only for manual? Danggg ittt! Well I appreciate your help? Did I say you have an e90?

[oVeRdOsE.]

Originally Posted by tht_one_335i

Only for manual? Danggg ittt! Well I appreciate your help? Did I say you have an e90?

E91, N54 single turbo 6mt.

this is my option on a BEF flash, it says ''6mt only'', does not mean that it won't work with a full flash or JB4 module.
Note this might very possibly only to adjust the RPM, and the automatic might be a fix RPM, but launch might work anyway. Auto people can confirm.

Also, option discussed 1 and 3 you can have burbles (crack and pops), JB4 alone I dont believe you can.