JB4 Dealer question

[Gjason99]

Hello all. I have recently just purchased a 2015 M3 from a forum member the car is perfect in terms of the spec I wanted and condition the only mod I am not too hyped about is the JB4 tune not because it's not a good product just because I rather have peace of mind with warranty then having it my question is there anything I should do prior to uninstalling it. Just trying to do my hardest that dealership doesn't find out

[Tommy L Garage]

they'll know...don't bother

[Gjason99]

What do you mean there'll know? I have read that you can just remove it and it's less of a chance they'll find out

[Thescout13]

Originally Posted by Gjason99

What do you mean there'll know? I have read that you can just remove it and it's less of a chance they'll find out

If you remove it they cannot see it from a physical inspection. But if they can see on the computer that boosts etc have been manipulated

[Gjason99]

What are the chances of them finding out On like just a regular computer scan say if I wanted to go in there to have them do something simple as update the iDrive system

[FriedPiston]

Only prerequisite prior to uninstalling the JB4 unit is to disconnect the ground cable from the 12v battery.

Also make sure that the JB4 isn't installed to support a set of catless downpipes, then you'll be as good as stock.

Ignore any non-sense that people are saying about the JB4 and drivetrain warranty. You'll be fine once it's removed.

[Thescout13]

Well it is not nonsense if he ever has a catastrophic failure of the drivetrain. They will know, it is not undetectable, it is not nonsense.

I agree with removing the JB4 for a simple service scan it will not pick it up, but if you ever have an engine warranty issue down the road, they WILL know when they pull the computer data. Period.

[FriedPiston]

Originally Posted by Thescout13

Well it is not nonsense if he ever has a catastrophic failure of the drivetrain. They will know, it is not undetectable, it is not nonsense.

I agree with removing the JB4 for a simple service scan it will not pick it up, but if you ever have an engine warranty issue down the road, they WILL know when they pull the computer data. Period.

Do you have proof of this claim? Or to make it easier, can you share a link to someone who has hard evidence of this claim?

Thanks!

Edit: I know FASTA data can detect if the DME or engine parameters was ever altered.

What I'm asking proof for is someone who had a JB4 installed ever being denied a drivetrain warranty claim. Because if this is evidently the case (we all know each claim is on a case by case basis) then it wouldn't make sense to remove any engine/exhaust mods at all.

[Thescout13]

Well I guess I could share a link if I wanted to waste my time and find one that states the obvious. But long story short, I have two close friends that are BMW techs and have shown me, in person, how a piggy back can be detected once you pull the data off of the DME. You do not have to believe me, and honestly, I do not give a shit if you do or not, but it is not a magic bullet that you think it is, and I very well know the risks considering EVERY single BMW I have owned in the past 5-7 years has been running a JB4 or equivalent. I know the risks, and I pay to play.

Not to mention, who would be stupid enough to post that their JB4 was detected by a dealer when they are fighting a warranty claim. Like come, you would have to be the biggest moron.

[FriedPiston]

Originally Posted by Thescout13

Well I guess I could share a link if I wanted to waste my time and find one that states the obvious. But long story short, I have two close friends that are BMW techs and have shown me, in person, how a piggy back can be detected once you pull the data off of the DME. You do not have to believe me, and honestly, I do not give a shit if you do or not, but it is not a magic bullet that you think it is, and I very well know the risks considering EVERY single BMW I have owned in the past 5-7 years has been running a JB4 or equivalent. I know the risks, and I pay to play.

Not to mention, who would be stupid enough to post that their JB4 was detected by a dealer when they are fighting a warranty claim. Like come, you would have to be the biggest moron.

No, I definitely believe you about FASTA. I edited my post above asking for proof that someone who had a JB4 installed was ever denied a drivetrain warranty claim.

That's all I'm asking for. Otherwise, there's no point in spreading non-sense, especially to the OP who is clearly new to this platform.

[Thescout13]

Originally Posted by nars3000

No, I definitely believe you about FASTA. I edited my post above asking for proof that someone who had a JB4 installed was ever denied a drivetrain warranty claim.

That's all I'm asking for. Otherwise, there's no point in spreading non-sense, especially to the OP who is clearly new to this platform.

Gotcha! My bad, I see we were talking past each other haha. That is what I meant. It definitely is ultimately detectable, and there is a guy in our local BMW CCA chapter that had his M4 warranty denied due to the JB4 being detected despite being properly removed when the tech pulled the computer information.

However, you are correct that I have never heard of someone having their warranty denied just because they went in for service with a JB4 properly uninstalled. However, if a catastrophic failure happens in the future, it definitely is detectable if your SA or regional rep want to look hard enough. That is all I meant.

[Gjason99]

Originally Posted by nars3000

Only prerequisite prior to uninstalling the JB4 unit is to disconnect the ground cable from the 12v battery.

Also make sure that the JB4 isn't installed to support a set of catless downpipes, then you'll be as good as stock.

Ignore any non-sense that people are saying about the JB4 and drivetrain warranty. You'll be fine once it's removed.

to support a set of catless downpipes? I know the car does not have any downpipes is that all I have to worry about that issue

[Thescout13]

Originally Posted by Gjason99

to support a set of catless downpipes? I know the car does not have any downpipes is that all I have to worry about that issue

Well, if the car has an exhaust system, then it has downpipes which come out of the turbos. The downpipes have cats on them. Some people buy downpipes with no cats to install and use the JB4 to clear the error code created by removing the cats. If you do not have aftermarket downpipes, you should have nothing to worry about.

[Gjason99]

Originally Posted by Thescout13

Well, if the car has an exhaust system, then it has downpipes which come out of the turbos. The downpipes have cats on them. Some people buy downpipes with no cats to install and use the JB4 to clear the error code created by removing the cats. If you do not have aftermarket downpipes, you should have nothing to worry about.

It's got an exhaust but it's a M performance exhaust with standard downpipes

[Thescout13]

Originally Posted by Gjason99

It's got an exhaust but it's a M performance exhaust with standard downpipes

Gotcha. The point I am trying to make is that every turbo M3/4 has downpipes, it's whether they are the factory ones with cats or aftermarket without. My bad, must have misread. If your exhaust is otherwise stock, except for the M performance Muffler, you should be fine

[Mike@N54Tuning.com]

The JB4 is one of the few tuning systems that can be removed without a trace. To do it properly first run mode 1/4 in dash to clear any pending or stored fault codes. Then open hood, lock doors, hide keys inside the house, and wait 15 min for DME to go to sleep. Then uninstall JB4 and you're good to go.

Make sure NO modifications are left on the car. If you leave on an intake or exhaust mods they will see them and can flag the car for them.

Mike

[Gjason99]

Originally Posted by Mike@N54Tuning.com

The JB4 is one of the few tuning systems that can be removed without a trace. To do it properly first run mode 1/4 in dash to clear any pending or stored fault codes. Then open hood, lock doors, hide keys inside the house, and wait 15 min for DME to go to sleep. Then uninstall JB4 and you're good to go.

Make sure NO modifications are left on the car. If you leave on an intake or exhaust mods they will see them and can flag the car for them.

Mike

Thanks mike And everyone else who has responded I really do like the performance the JB4 offers I will probably be putting it back on after a service visit. Mike when you say run mode 1/4 to Erase all fault codes are you referring to map1/4 ?

[yocubed]

Originally Posted by Gjason99

Thanks mike And everyone else who has responded I really do like the performance the JB4 offers I will probably be putting it back on after a service visit. Mike when you say run mode 1/4 to Erase all fault codes are you referring to map1/4 ?

Honestly if all you want to remove it for is a service visit and to update iDrive then you should be fine by just putting the JB4 into mode 0 (full bypass) and disconnecting the OBD connector from the OBD port. No real need to completely remove the JB4 for the visit

[Mike@N54Tuning.com]

Originally Posted by Gjason99

Thanks mike And everyone else who has responded I really do like the performance the JB4 offers I will probably be putting it back on after a service visit. Mike when you say run mode 1/4 to Erase all fault codes are you referring to map1/4 ?

I meant menu 4, option 1, delete all fault codes

Mike

[FriedPiston]

Originally Posted by Gjason99

Thanks mike And everyone else who has responded I really do like the performance the JB4 offers I will probably be putting it back on after a service visit. Mike when you say run mode 1/4 to Erase all fault codes are you referring to map1/4 ?

Menu option 4 on the Speedo, option 1 on the Tach

http://www.n54tech.com/forums/showthread.php?t=25401

[rosenbergendo]

Originally Posted by Mike@N54Tuning.com

The JB4 is one of the few tuning systems that can be removed without a trace. To do it properly first run mode 1/4 in dash to clear any pending or stored fault codes. Then open hood, lock doors, hide keys inside the house, and wait 15 min for DME to go to sleep. Then uninstall JB4 and you're good to go.

Make sure NO modifications are left on the car. If you leave on an intake or exhaust mods they will see them and can flag the car for them.

Mike

The ECU tuners are trying to bash the JB4 again with out any substantiative proof. I have taken my car in twice for engine related issues such as a blown charge pipe and an intercooler that had an issue. Both times JB$ was removed and warranty covered both. No questions asked. If I was tuned zero.zero chance that gets covered under warranty.

[BoxKing]

Originally Posted by rosenbergendo

The ECU tuners are trying to bash the JB4 again with out any substantiative proof. I have taken my car in twice for engine related issues such as a blown charge pipe and an intercooler that had an issue. Both times JB$ was removed and warranty covered both. No questions asked. If I was tuned zero.zero chance that gets covered under warranty.

Most of the ECU Tuners were once JB4 owners - due to flash tuning only being optional over the past 2 years. I'd take their experience over someone who is bias bc he/she just bought a JB4 and want to mislead those seeking accurate info; oddly the N54 Tuning crew is spreading the same nonsense (only a matter of time BMS jumps on the OBD II bandwagon.).

I would hardly classify your warranty claims as "drivetrain" claims. You got a JB4 damn well knowing that you were putting yourself at risk of the charge pipes breaking, and since you didn't upgrade, that shit falls on you (glad it was covered).

No dealer wants to shell out big bucks on a major drivetrain issue, and if they do due diligence and pull the right data you most likely will get a denial on your claim. Any other spoken words saying otherwise are false.