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Technical Topics B58 6-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications Jb4 worth it.

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      09-14-2020, 10:10 PM   #1
moto111
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Jb4 worth it.

So first bmw and itís a 20 m340 love the car just would like to be in the 11s . The car is a lease so thereís that . Iím leaning towards the jb4 for the simplicity and safety compared to tuning their car .

Will I notice a big difference from stock to the stage 2 jb4 map?

Thanks for any input new to bmw period come from tuning 5.0 mustangs which were bullet proof on tune only
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      09-15-2020, 01:47 AM   #2
chenry
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Quote:
Originally Posted by moto111 View Post
So first bmw and it’s a 20 m340 love the car just would like to be in the 11s . The car is a lease so there’s that . I’m leaning towards the jb4 for the simplicity and safety compared to tuning their car .

Will I notice a big difference from stock to the stage 2 jb4 map?

Thanks for any input new to bmw period come from tuning 5.0 mustangs which were bullet proof on tune only
While I can't help you with your specific question in that I am Mission Performance flashed - If you do decide to go with a JB4 or JB+ perhaps I can help by suggesting you look in the "for sale section" of this forum....there are typically a good number of them for sale - that way you can save some money :-)

https://g20.bimmerpost.com/forums/fo...play.php?f=805

Last edited by chenry; 09-15-2020 at 02:05 AM.. Reason: typo (I'm sure there are others I missed HA)
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      09-15-2020, 07:25 AM   #3
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In my experience, and I've had both products on cars in the past. The car just runs smoother and better with a flash tune. There's also the fact that it makes more power with a flash tune. My opinion is that having the computer that was designed for the car do all the work is better then using an external controller. Again thats my opinion though. I dont think you will be disappointed with the extra power from either one.
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      09-15-2020, 09:40 AM   #4
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Worry is itís not my car
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      09-15-2020, 11:59 AM   #5
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The JB4 is the go-to tune for any car that is leased or under warranty. Can't do quite as much as a full ECU tune but gets you close and offers a lot of great features too like CANflap, boost by gear, on the fly map changes, E85 support, and others.
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      09-16-2020, 09:42 AM   #6
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Quote:
Originally Posted by moto111 View Post
So first bmw and itís a 20 m340 love the car just would like to be in the 11s . The car is a lease so thereís that . Iím leaning towards the jb4 for the simplicity and safety compared to tuning their car .

Will I notice a big difference from stock to the stage 2 jb4 map?

Thanks for any input new to bmw period come from tuning 5.0 mustangs which were bullet proof on tune only
it's a big difference between stock and stage 2. We offer the Jb4 with a 14-day money-back guarantee. Give it a try and let us know how it goes
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      09-16-2020, 05:15 PM   #7
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Quote:
Originally Posted by mike@x-ph.com View Post
it's a big difference between stock and stage 2. We offer the Jb4 with a 14-day money-back guarantee. Give it a try and let us know how it goes
Hey Mike, are there flash tunes available for the 2021 model 340xi yet? I know the DME has to be sent in for the 2020 so I am guessing its the same for the 2021 if its available. Do you know if they are tune-able yet?
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      09-16-2020, 11:12 PM   #8
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I tested jb4 at the drag strip, map1 was same as stock and map2 was 4mph and 4 tenths slower than stock.

It doesn't work on this platform, flash is required I suspect due to torque limitation.
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      Yesterday, 10:21 AM   #9
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Quote:
Originally Posted by carguy19 View Post
Hey Mike, are there flash tunes available for the 2021 model 340xi yet? I know the DME has to be sent in for the 2020 so I am guessing its the same for the 2021 if its available. Do you know if they are tune-able yet?

As long as you are okay with sending the DME, you should be able to get the 2021 flashed
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      Today, 04:17 AM   #10
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Quote:
Originally Posted by ls3c6 View Post
I tested jb4 at the drag strip, map1 was same as stock and map2 was 4mph and 4 tenths slower than stock.

It doesn't work on this platform, flash is required I suspect due to torque limitation.
Same even map 5 wasnít really quicker then stock car, the jb4 on this platform is pretty subpar
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      Today, 05:41 AM   #11
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Originally Posted by Antec800 View Post
Same even map 5 wasn’t really quicker then stock car, the jb4 on this platform is pretty subpar
Doesnt really make sense if you know how JB4 works. What do the datalogs show? Did you work with their support? Go on their forums?
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