[FKDTM2]

Hey Group,

I’ve seen one member having trouble with a JB4 recently on his M2. Looks like there’s a potentiel tune problem since the JB4 is basically made for M3/4 and M2 got a different tune. The problem was on a 6MT cars, mine is a 8AT, I doubt it change anything but.

Is there anyone else running a JB4 at the moment? Curious to know if anyone else experienced any problem.

My car is going in the shop in a week to get full catless downpipe, crossover pipe and midpipe, along with RKs front mount intake!

If some of you got any information for me, I’d appreciate it

Thank you!

[StickyPickle]

I was planning on adding a JB4 until I came across the same thing you’re talking about so I’m holding out until BMS addresses the issue.

[M_Power Rob]

JB4 = absolute junk (sorry, just had to...big hater of piggyback garbage (they arent tunes so I cant call it other than anything more than what it is)).

[FKDTM2]

Originally Posted by M_Power Rob

JB4 = absolute junk (sorry, just had to...big hater of piggyback garbage (they arent tunes so I cant call it other than anything more than what it is)).

Not a big fan either, all my previous cars were tuned, RS3, Supra, Golf R etc. But this locked DME is a pain in the ass to unlock.

[M_Power Rob]

Originally Posted by FKDTM2

Not a big fan either, all my previous cars were tuned, RS3, Supra, Golf R etc. But this locked DME is a pain in the ass to unlock.

Its actually quite simple (as long as you have a reputable shop to work with). Send off to femto to unlock then have tuned (DME or another trusted tuner of your choosing). Obviously, you should add mods based on your tune. The issue for many will be the cost (I figure if you are tuning, you are aware of and accept the risks of losing you warranty).

[FKDTM2]

Originally Posted by M_Power Rob

Its actually quite simple (as long as you have a reputable shop to work with). Send off to femto to unlock then have tuned (DME or another trusted tuner of your choosing). Obviously, you should add mods based on your tune. The issue for many will be the cost (I figure if you are tuning, you are aware of and accept the risks of losing you warranty).

You still need to ship the ECU overseas, that’s the thing I’m not willing to do at the moment. I plan on getting rid of this M2 to get a new one in 2024-25 with an individual colors so that’s another reason why I’m looking at the JB4/Dahler Performance / Racechip option!

[M_Power Rob]

Originally Posted by FKDTM2

You still need to ship the ECU overseas, that’s the thing I’m not willing to do at the moment. I plan on getting rid of this M2 to get a new one in 2024-25 with an individual colors so that’s another reason why I’m looking at the JB4/Dahler Performance / Racechip option!

If you are waiting for individual colors, you will have a long wait (it wont be an option).

The shop I use works with femto on a regular basis (never had any losses or problems with the process). The turnaround time is about a week. If you are concerned with not having your car for a couple of weeks, thats understandable but it itls what it is. If you are concerned with not getting your ecu back, its all about working with the right ahop and them knowing what they are doing.

[Hendo741]

Originally Posted by M_Power Rob

JB4 = absolute junk (sorry, just had to...big hater of piggyback garbage (they arent tunes so I cant call it other than anything more than what it is)).

100% disagree. I've run a JB4 on 4 different vehicle, 2 B58 2 S58, and never had a single issue on any of them. I'm currently running one on my X3M as the M4CX did get femto unlocked and flex fuel tuned, but the JB4 was on it for months before shipping off the ECU.

Is a JB4 as good as a flash tune? No. Is it a much cheaper and simpler power adder? Yes. If someone were to just want a simple stg 1 or 2 OTS tune and never go deeper, I would recommend a JB4 over the current process every time. Similar power levels for much less of an investment. JB4 can also be removed and sold. A seller is unlikely to recoup any of the unlock money because most of these cars just get traded in.

I also wouldn't ever try to push big power with one either. I just run maps 2 or 4 and call it a day. Its very limited in that regard because they cant adjust fuel or timing. 100 hp for $650 or so used is a great investment considering you can just resell when done using and break even. Very much not garbage imo.

[Hendo741]

Originally Posted by FKDTM2

Hey Group,

I’ve seen one member having trouble with a JB4 recently on his M2. Looks like there’s a potentiel tune problem since the JB4 is basically made for M3/4 and M2 got a different tune. The problem was on a 6MT cars, mine is a 8AT, I doubt it change anything but.

Is there anyone else running a JB4 at the moment? Curious to know if anyone else experienced any problem.

My car is going in the shop in a week to get full catless downpipe, crossover pipe and midpipe, along with RKs front mount intake!

If some of you got any information for me, I’d appreciate it

Thank you!

Got a link to whatever thread or site is discussing this issue? I know that for the M3s and 4s a JB4 can go between a comp and non comp with no issues. The M2 engine is supposedly even further detuned, but the jb4 just adds a few lbs of boost.

[M_Power Rob]

Originally Posted by Hendo741

100% disagree. I've run a JB4 on 4 different vehicle, 2 B58 2 S58, and never had a single issue on any of them. I'm currently running one on my X3M as the M4CX did get femto unlocked and flex fuel tuned, but the JB4 was on it for months before shipping off the ECU.

Is a JB4 as good as a flash tune? No. Is it a much cheaper and simpler power adder? Yes. If someone were to just want a simple stg 1 or 2 OTS tune and never go deeper, I would recommend a JB4 over the current process every time. Similar power levels for much less of an investment. JB4 can also be removed and sold. A seller is unlikely to recoup any of the unlock money because most of these cars just get traded in.

I also wouldn't ever try to push big power with one either. I just run maps 2 or 4 and call it a day. Its very limited in that regard because they cant adjust fuel or timing. 100 hp for $650 or so used is a great investment considering you can just resell when done using and break even. Very much not garbage imo.

I am not getting into a passing match over this. You are absolutely entitled to your opinion however it wobt change mine.

[mike@x-ph.com]

While a proper flash tune is often preferable to a piggyback system, it's important to note that a flash tune may not be a feasible option for all customers. Thus, the relevance and utility of systems like the JB4 should not be dismissed.

Labeling the JB4 as "junk" seems to disregard the substantial capabilities and features that this piggyback system offers. With a basic understanding of how these systems operate, it becomes evident that such a critique may not be entirely justified.

I get that you prefer flash tuning But using the word "junk" as its obviously unfair, hinders the points that you are trying to make.

[FKDTM2]

Originally Posted by Hendo741

Got a link to whatever thread or site is discussing this issue? I know that for the M3s and 4s a JB4 can go between a comp and non comp with no issues. The M2 engine is supposedly even further detuned, but the jb4 just adds a few lbs of boost.

I don’t, I saw the guy posting something in instagram about removing this shitty jb4 and I asked why.

Currently I’m moving forward to install it next week, do some log and then see by myself. Sometimes it’s firmware related. Worst case I can resell it.

[Hendo741]

Originally Posted by M_Power Rob

I am not getting into a passing match over this. You are absolutely entitled to your opinion however it wobt change mine.

An opinion is that you think pepsi tastes better than coke. Calling a piece of tech garbage when it is in fact not, is just being wrong not an opinion.

[Hendo741]

Originally Posted by FKDTM2

I don’t, I saw the guy posting something in instagram about removing this shitty jb4 and I asked why.

Currently I’m moving forward to install it next week, do some log and then see by myself. Sometimes it’s firmware related. Worst case I can resell it.

Id say that's probably the best idea. Be prepared that the TMAP sensor sucks. A set of pick tool, specifically a 90 degree pick, makes it much easier.

If it does turn out to be having issues id like to see the logs and info. I plan on picking up a G87 to replace my G82 once they announce the comp xdrive (I know not confirmed but I'm really hoping lol).

[M_Power Rob]

Originally Posted by Hendo741

An opinion is that you think pepsi tastes better than coke. Calling a piece of tech garbage when it is in fact not, is just being wrong not an opinion.

Ummmm...no, my opinion is JB4s and piggyback devices are junk. Dont like my opinion, I couldn't care less.

Again, not getting into a pissing match which is where this is going. I posted my opinion, you posted yours. Last post from me on this subject.

[StickyPickle]

Originally Posted by M_Power Rob

Ummmm...no, my opinion is JB4s and piggyback devices are junk. Dont like my opinion, I couldn't care less.

Again, not getting into a pissing match which is where this is going. I posted my opinion, you posted yours. Last post from me on this subject.

For someone who’s looking to do certain things that only a flash tune can do and not a piggyback, I get it. But why call it junk if it serves someone’s needs who’s only looking to do a basic upgrade and not go crazy with it? In my case, I’m only looking to do some basic bolt on mods such as intakes, down pipe and full exhaust then get a piggyback at some point. Since I’m not planning on upgrading the drivetrain, engine block, etc, I’m only looking to get gains of maybe 80-100HP or so.

I can see calling it junk if it didn’t work (which in this case could be true but we need info) but it’s one of the more reliable piggybacks on the market. I’m only trying to understand where you’re coming from when you say it’s junk, does it not reliably do what it’s advertised to do in your experience or is it because it’s limited compared to what a flash tune offers?

Generally curious as I’m sorta new to all this kinda stuff.

[rangerfan94]

I love the JB4 in my Golf R. Maybe it is junk. It sure has transformed the car for the better, it can be unplugged at any time and no one will ever know it’s there. So my junk has value to me. I got lucky that the Cobb tune in my Macan GTS didn’t cause me warranty issues. I think the dealer did me a favor the two times it was in for engine work. I would have loved the unplug it and it’s gone forever functionality with that car. Others, of course, are entitled to their different opinions.

I will definitely keep a JB4 in mind once I have broken in my M2. If it ever leaves the NJ port, that is. I for one will never install a true tune on a car still within the warranty period unless it is something like Dinan done by the dealer that will fix my car. Had a Dinan tune on my X5 a while back and it made a big difference to that car.

[Jperezivan]

I just installed my JB4 that I had previously in my 22 M3xdrive into my 2023 M2 today. I can tell you just from driving the car for 20 minutes and going back and forth from map 0 to map 2 the difference is very noticeable. I will be doing a couple draggy runs this weekend because numbers don’t lie.

[FKDTM2]

Originally Posted by Jperezivan

I just installed my JB4 that I had previously in my 22 M3xdrive into my 2023 M2 today. I can tell you just from driving the car for 20 minutes and going back and forth from map 0 to map 2 the difference is very noticeable. I will be doing a couple draggy runs this weekend because numbers don’t lie.

Awesome! I’d love to see a 1/4miles run, to see the trap speed. Any other mod than the JB4?

[Xspeedracer]

Well here in CA the smog machine can detect tunes and any good smog tech will spot a piggy back device and it will fail the visual inspection and will fail the car on the spot and list it in the database as tuned until it’s removed and set back to stock

[KevM2]

Originally Posted by FKDTM2

Hey Group,

I’ve seen one member having trouble with a JB4 recently on his M2. Looks like there’s a potentiel tune problem since the JB4 is basically made for M3/4 and M2 got a different tune. The problem was on a 6MT cars, mine is a 8AT, I doubt it change anything but.

Is there anyone else running a JB4 at the moment? Curious to know if anyone else experienced any problem.

My car is going in the shop in a week to get full catless downpipe, crossover pipe and midpipe, along with RKs front mount intake!

If some of you got any information for me, I’d appreciate it

Thank you!

You’re correct… I had ordered it until I found the same comments about jb4 issues with the G platform and cancelled my order… best to wait until they tweak it and more members post their findings…

[Jperezivan]

Originally Posted by FKDTM2

Awesome! I’d love to see a 1/4miles run, to see the trap speed. Any other mod than the JB4?

Only JB4 for now, going to do a couple runs this week and log them and send them to burger for review to ensure everything looks good. But without a doubt the car is pulling a lot harder not to add that boost gauge was reading 21psi on map2. My car is a 6MT