[arhoads335i]

Hey guys so I've been recently contemplating going to just a BEF maybe a pro tune. I've recently put the JB4 to map 0 and the car just seems to drive much smoother than any map when the JB4 is intervening. I just put in slightly bigger turbos with inlets and outlets that are causing some over boosting issues, so this may be the cause of some of this. Any opinions on the matter?
I do not use E85 or Meth at the moment so using jb4 as a fuel controller is not a reason I would keep it.
All in all the JB4 just feels peaky sometimes and when its engaged the car seems to surge at idle more.

[MooreBoost]

Your experience is similar to what I've read from others in that MHD only tends to be smoother.

The arguments for running both are generally centered around the extra safety mechanisms built into the JB4.

[Cloud9blue]

I just recently remove the JB4 from my car in preparation for ST conversion. And now only running on the MHD stage 2+ tunes.

Don't really see any reason one should use jb4 for boost control anymore. The car is far smoother and predictable with MHD. The flash only tune has progressed so much over the years, it has become a much superior tune on this platform, unless you need the jb4 for meth or port injection. The pid boost control on jb4 is far inferior to DME.

[Mike@N54Tuning.com]

JB4 map0 still has the JB4 fully running boost control, only with a stock like boost target, instead of the higher targets normally used.

In terms of what you can do with the JB4 installed that you can't do without it, there are several threads on the subject, so no reason to dive in to it here. It's not uncommon for people to remove the JB4, initially prefer flash only (most initially likes whatever is new to them), only to find down the road how much easier and safer the JB4 makes certain setups. So be sure to stash it for awhile before selling if you decide to remove.

Mike

[arhoads335i]

Originally Posted by Cloud9blue

I just recently remove the JB4 from my car in preparation for ST conversion. And now only running on the MHD stage 2+ tunes.

Don't really see any reason one should use jb4 for boost control anymore. The car is far smoother and predictable with MHD. The flash only tune has progressed so much over the years, it has become a much superior tune on this platform, unless you need the jb4 for meth or port injection. The pid boost control on jb4 is far inferior to DME.

hey Cloud9blue thanks for the real input! I may have BQ do a custom tune for it then without the JB4 as I'm having some over boosting issues with the new turbos with inlets and outlets lol

[335e92tx]

an Etune (with MHD logging) would be the best solution for you. It would use widely recognized variables and provide you future adjustments to suit your tuning needs.

[Faredo]

I removed my jb4 early this year and happy with the results. Like others have said. much smoother. It seems the trend anymore seeing how many Jb4 units are hitting the used market place. A shame really. I like the people behind it.

[FEDE/E92]

My personal opinion is JB4+MHD is best if 2 worlds. The problem I see most common with JB4 is settings. JB4 doesn’t come ready to go for the user, takes a lot of time from the user to learn how to set all the different menus and learn what each do. I’m running JB4 /BET on my N54st, took a bit get it all dialed in and running its best. And if you plan to run PI or meth is definitely the way to go. Again took me hours of reading, searching the forums figure most of it out but once is set and done correctly have zero issues, car runs hard and like stock which I love.

[F10onesimus]

Buger tuning Jb4 stage 2 harness b n55 e-series use 375 obo

[Kaz26]

After hours of reading the back and forth on the topic, I had decided to sell the JB4 I recently bought without ever trying it. Afternoon listing it, I continued reading, and asking questions to those who are more experienced and knowledgeable and viewing logs and data related to the topic, I have since realized that JB4 + BEF might be the way to go if you have the time to learn how to use it properly, especially if you’re running meth, as I now plan to do for several reason, but primarily because the nearest E85 pump is an 85 mile round trip and the 91 octane pump gas is weak.
After a lot of reading and talking to those who have abandoned the JB4 for flash only, I have come to realize that most of them have no interest in learning their JB4 enough to fine tune the JB4 + BEF and perhaps end up getting talked into flash only by a tuner selling their tunes. I am still new to tuning and turbos, but I am starting to learn how it all works and find it very fascinating and think it will be more rewarding in the end to learn JB4 properly, use it with a BEF and then try it without to see what I like best.
As for those who claim the flash only is smoother than JB4+BEF, I understand the concept of why a DME flash should be better than a piggyback, but there is too much back and forth from people trying to sell a product for anyone to gain true insight without personally trying them both. Even then, one must take the time to learn how to configure the JB4 before giving up on it.
With that said, this is a great time to pick up a cheap used JB4 to try it out!

[feuer]

until MHD come with Bluetooth and IPhone compatible jb4 it is!

[Quick335XI]

Originally Posted by feuer

until MHD come with Bluetooth and IPhone compatible jb4 it is!

Yep! Agreed.

The jb4 isn’t just a tune it’s a “platform”. It offers integrated NLS, boost control, launch control, Methanol safety, all KINDS of stuff. Plus, I just LOVE being able to switch maps on the fly!! VERY nice.

Cedar recommended I go the jb4 +bef and so far I just love it. I actually had a wot box and pulled it and sold it for the jb4 solution

And the Bluetooth is FREAKIN AWESOME!!

[BMWPower88]

I just bought Single turbo kit and i have no idea what to do with tuning situation.
How can I run MHD only on single turbo?
What map do I run before getting e*tune ( i want to drive my car with single turbo to work etc before i get final e*tune . Where do i get e-tune for single turbo?

[RSL]

Originally Posted by Quick335XI

The jb4 isn’t just a tune it’s a “platform”.

JB4 isn't a tune at all, I think most people fail to understand that completely.

Originally Posted by BMWPower88

I just bought Single turbo kit and i have no idea what to do with tuning situation.
How can I run MHD only on single turbo?
What map do I run before getting e*tune ( i want to drive my car with single turbo to work etc before i get final e*tune . Where do i get e-tune for single turbo?

Motive boost box allows the DME to control a MAC solenoid for singles. Plenty of N54 tuners out there that can do it, just search. Motive, BQ, Wedge, Twisted Tuning, etc.