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Technical Topics B58 6-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications 2020 M340i JB4

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      08-23-2019, 02:49 PM   #1
iPetey
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Red face 2020 M340i JB4

Hi all,

New here, and new to BMW. Picked up a 2020 m340i xDrive and i love it. However I'm trying to figure out if i can use a JB4 on my car. My buddy purchased one for me as a gift, but i am hesitant to put it on the car because i dont know if its compatible and/or if it will throw any error codes and whatnot. Any information is greatly appreciated.

Thank you!!!
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      08-23-2019, 03:07 PM   #2
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Yes, it’s compatible. I wish I had buddies that would drop $700+ on a gift for me
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      08-23-2019, 03:58 PM   #3
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Quote:
Originally Posted by Crazyotter View Post
Yes, it's compatible. I wish I had buddies that would drop $700+ on a gift for me
haha thank you! yeah, it's a mutual thing. i did a lot for him as well. do i need to update it? or anything special? also where do people typically place it under the hood?
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      08-23-2019, 04:26 PM   #4
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Did you watch the install video?
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      08-23-2019, 04:27 PM   #5
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      08-23-2019, 04:28 PM   #6
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If he just got it, then it should be good to go right out of the box.
Did you get the Bluetooth adapter?
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      08-23-2019, 04:54 PM   #7
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Quote:
Originally Posted by Crazyotter View Post
If he just got it, then it should be good to go right out of the box.
Did you get the Bluetooth adapter?
i did watch the video, guess i'll see how mine looks in comparison so i can stash it. another member told me there's a perfect place for it. yeah it's brand new with the wireless connector :-) i'm about to download the app as well. thank you!!
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      08-23-2019, 08:27 PM   #8
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Can you let me know how much of a difference it makes?
Also start with map 2
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      08-23-2019, 08:28 PM   #9
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Quote:
Originally Posted by Crazyotter View Post
Can you let me know how much of a difference it makes?
Also start with map 2
sure thing i'm almost done, did you do yours?
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      08-23-2019, 09:07 PM   #10
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Not yet. I’m waiting to see the reviews on the Mission tune.
I’ve been researching JB4 for awhile now though.
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      08-23-2019, 09:39 PM   #11
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Quote:
Originally Posted by Crazyotter View Post
Not yet. I'm waiting to see the reviews on the Mission tune.
I've been researching JB4 for awhile now though.
Would love to know how they compare as well
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      08-23-2019, 10:23 PM   #12
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Quote:
Originally Posted by Crazyotter View Post
Not yet. I'm waiting to see the reviews on the Mission tune.
I've been researching JB4 for awhile now though.
everything went smooth, running map 2. going to try 3 tomorrow and make a vid :-)
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      08-24-2019, 10:27 AM   #13
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I transferred mine from my previous 340i to the new M340 about a month ago, no issues so far. I need to buy the BT kit as JB4 doesn't have dash compatibility with the digital cockpit, which is what I relied on for changing maps and deactivating. Also, I couldn't figure out how to enable (if it even works at all) the can flap open feature since that was only accessible from the stalk controls (no controlability from the PC application over USB).

As far as performance, it's been great so far but I don't regularly push it to max boost levels. It is definitely making a difference being set on Map2 in my case.

Last comment, install was pretty straight forward and comparable except for one aspect in my opinion. Getting through the firewall. There is a black plastic piece in the area of the drivers side hood hinge that needs to be removed. It takes some finagling but it can come out without damaging anything. Once that is removed, it's fairly easy to punch through the silver metallic sticker that covers the access into the drivers footwell. I used a fish tape and didn't even have to remove any lower plastic pieces in the footwell, as I was able to wiggle the fish tape to pop out around the OBDII connection, then feed the small end of the JB4 cable back through to the engine compartment. Everything tucked in nicely into the area under the plastic cover.
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Last edited by evermire; 08-24-2019 at 10:42 AM..
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      08-24-2019, 10:48 AM   #14
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Quote:
Originally Posted by iPetey View Post
everything went smooth, running map 2. going to try 3 tomorrow and make a vid :-)
Is it night and day difference with the acceleration?
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      08-24-2019, 01:07 PM   #15
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Quote:
Originally Posted by Crazyotter View Post
Quote:
Originally Posted by iPetey View Post
everything went smooth, running map 2. going to try 3 tomorrow and make a vid :-)
Is it night and day difference with the acceleration?
big difference, sounds even more aggressive. i'm in map 3 now and the difference is very noticeable.

map 2
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      08-25-2019, 04:04 PM   #16
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Quote:
Originally Posted by iPetey View Post
big difference, sounds even more aggressive. i'm in map 3 now and the difference is very noticeable.

map 2
Nice! Do you feel it throughout the power-band or just high RPM?
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      08-25-2019, 04:13 PM   #17
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Quote:
Originally Posted by evermire View Post
I transferred mine from my previous 340i to the new M340 about a month ago, no issues so far. I need to buy the BT kit as JB4 doesn't have dash compatibility with the digital cockpit, which is what I relied on for changing maps and deactivating. Also, I couldn't figure out how to enable (if it even works at all) the can flap open feature since that was only accessible from the stalk controls (no controlability from the PC application over USB).

As far as performance, it's been great so far but I don't regularly push it to max boost levels. It is definitely making a difference being set on Map2 in my case.

Last comment, install was pretty straight forward and comparable except for one aspect in my opinion. Getting through the firewall. There is a black plastic piece in the area of the drivers side hood hinge that needs to be removed. It takes some finagling but it can come out without damaging anything. Once that is removed, it's fairly easy to punch through the silver metallic sticker that covers the access into the drivers footwell. I used a fish tape and didn't even have to remove any lower plastic pieces in the footwell, as I was able to wiggle the fish tape to pop out around the OBDII connection, then feed the small end of the JB4 cable back through to the engine compartment. Everything tucked in nicely into the area under the plastic cover.
this is awesome would you be open to meeting in Huntington Beach/Westminster (basically 405 and Westminster Blvd) for a dyno comparison between your car and a flashed car? with the new HPFP I'm wondering how the cars will perform with the piggyback. We can grab numbers, performance variables etc...I think that would be great to share with the forum - we can even broadcast live.

Anyhoo are you open to putting your car on a dyno and hanging out for an hour or so while we do the same with a flashed car?
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      08-25-2019, 04:53 PM   #18
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Quote:
Originally Posted by chenry View Post
Quote:
Originally Posted by evermire View Post
I transferred mine from my previous 340i to the new M340 about a month ago, no issues so far. I need to buy the BT kit as JB4 doesn't have dash compatibility with the digital cockpit, which is what I relied on for changing maps and deactivating. Also, I couldn't figure out how to enable (if it even works at all) the can flap open feature since that was only accessible from the stalk controls (no controlability from the PC application over USB).

As far as performance, it's been great so far but I don't regularly push it to max boost levels. It is definitely making a difference being set on Map2 in my case.

Last comment, install was pretty straight forward and comparable except for one aspect in my opinion. Getting through the firewall. There is a black plastic piece in the area of the drivers side hood hinge that needs to be removed. It takes some finagling but it can come out without damaging anything. Once that is removed, it's fairly easy to punch through the silver metallic sticker that covers the access into the drivers footwell. I used a fish tape and didn't even have to remove any lower plastic pieces in the footwell, as I was able to wiggle the fish tape to pop out around the OBDII connection, then feed the small end of the JB4 cable back through to the engine compartment. Everything tucked in nicely into the area under the plastic cover.
this is awesome would you be open to meeting in Huntington Beach/Westminster (basically 405 and Westminster Blvd) for a dyno comparison between your car and a flashed car? with the new HPFP I'm wondering how the cars will perform with the piggyback. We can grab numbers, performance variables etc...I think that would be great to share with the forum - we can even broadcast live.

Anyhoo are you open to putting your car on a dyno and hanging out for an hour or so while we do the same with a flashed car?
This sounds great! Do it!

Also, grab some real life 0-60 and 60-100 stats.
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      08-25-2019, 09:44 PM   #19
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Can you post a log?
Curious to compare to my 440 mppsk jb4
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      08-26-2019, 03:02 PM   #20
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Quote:
Originally Posted by chenry View Post
this is awesome would you be open to meeting in Huntington Beach/Westminster (basically 405 and Westminster Blvd) for a dyno comparison between your car and a flashed car? with the new HPFP I'm wondering how the cars will perform with the piggyback. We can grab numbers, performance variables etc...I think that would be great to share with the forum - we can even broadcast live.

Anyhoo are you open to putting your car on a dyno and hanging out for an hour or so while we do the same with a flashed car?
Hi
I would be available for that if you still looking for somebody. I can be available this coming weekend. Let me know
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      08-27-2019, 11:41 PM   #21
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Quote:
Originally Posted by chenry View Post
this is awesome would you be open to meeting in Huntington Beach/Westminster (basically 405 and Westminster Blvd) for a dyno comparison between your car and a flashed car? with the new HPFP I'm wondering how the cars will perform with the piggyback. We can grab numbers, performance variables etc...I think that would be great to share with the forum - we can even broadcast live.

Anyhoo are you open to putting your car on a dyno and hanging out for an hour or so while we do the same with a flashed car?
I'd be open, but an interesting series of events over the last few days. I'm running map 2 btw on the JB4 with firmware v13. Last Friday at about 1100 total miles my check engine light came on. No noticeable difference in driving performance though, but when it didn't go away on its own I stopped by BMW and dropped it off for a look. I've taken my previous cars to the same dealership and SA with various mods and they never care or give me grief. I do disable the JB4 before dropping off, but I don't go through the headache of removal or any of that.

They call me after having it for a day (they were busy) and told me that the engine code was related to over boosting and A/F ratio variance. They say it's related to the 'flash' and that I need to actually remove it from the car and bring it back in for them to see if anything really happened. I'm calling BS on most of it, given that they wern't even able to correctly identify the JB4 in the first place, but I have no tool or way of checking G series fault codes (or clearing them) myself currently. The JB4 doesn't officially support this chasis yet. Anyways, kind of unsure what to do at this point given they noted it on my paperwork

For now it is disabled.
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      08-28-2019, 08:10 AM   #22
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I think autozone will read your cel code for free. At least they used to
I would try another dealer. Sounds like if there’s anything actually wrong with your car they’re going to blame your tune
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