Why you should run the JB4 + Flash instead of just the Flash

[mike@x-ph.com]

This brief article explains the importance of using a JB4 even if your BMW is already Flash Tuned. It specifically explains N54 applications but it mostly applies to all engines.

1- Advanced Safety system

• If boost exceeds your safety settings, the JB4 reverts to the stock map
• If AFR is too lean (15% variance), JB4 reverts to the stock map
• Extra safety for Port Injection and WMI

2- Absolute Boost Control System

• JB4 targets an absolute boost level where boost is always the same (Independent of external factors)
• JB4 has ability to set max boost per gear
• JB4 automatically tunes Wastegates and fuel trims
• Autotune maps that gives max safe power based on mods, fuel, and IAT (Intake Air Temperature)

3- On The Fly Changes

• Boost Levels
• Max boost per. gear
• Gauges

4- Better Feedback for the Driver

• Ability to change ANY settings, map, gauges using the JB4 app (on phone) without the need for laptop connectivity
• Ability to monitor real time boost, AFR timing, knock, and meth flow
• Ability to data log and email it to BMS using the mobile app (without the need for any cable)
• Ability to record data, 250x per second

5- Complete Tuning System

• Eliminates need for additional modules
• No lift shift
• 2 step
• Anti-Lag
• Port Injection Control
• Flex-Fuel sensors
• Water/Methanol Control
• Ability to work as a cohesive unit rather than have multiple modules working separate

6- FREE Upgrades and Support

• Lifetime Firmware Upgrades and Backend Flashes
• Free support from the BMS team

7- No Change In DME

• All DME table values stay intact
• JB4 adds performance and safety while keeping DME 100% in charge

Thank you to 'BMW Fanatic' on YouTube for the awesome explanation!

[allmotor_2000]

To clarify since the topic says JB4+Flash:

If boost exceeds your safety settings, the JB4 reverts to the stock map

^^ more clarity. JB4 Map reverts to Map 4 so no boost additive. Car doesn't go to 'stock', rather the baseline map on the DME as flashed.

[TheHouseWon]

So if I have an OTS tune (bootmod3) I can run Map2 at 22psi and take advantage of all the safety features?

[allmotor_2000]

Originally Posted by TheHouseWon

So if I have an OTS tune (bootmod3) I can run Map2 at 22psi and take advantage of all the safety features?

Sure - if the JB4 senses anything going wrong it essentially reverts to what the DME baseline tune is. i.e. either stock or whatever flash is on there. For any high boost runs, the JB4 is very essential to make sure all is safe. It saved my motor many times (like meth running out etc.)

[JetBee]

I got a question regarding the jb4 mobile app, it doesn't show any sort of temperature (oil, trans, and water I believe), is that normal?

[Yiming]

I have a flash tune that targets 22psi, let say I want to run a lower boost today and switch on jb4 map 3 which targets 18psi. Will this work?

[mike@x-ph.com]

Originally Posted by TheHouseWon

So if I have an OTS tune (bootmod3) I can run Map2 at 22psi and take advantage of all the safety features?

Correct

Originally Posted by JetBee

I got a question regarding the jb4 mobile app, it doesn't show any sort of temperature (oil, trans, and water I believe), is that normal?

Contact the JB4bluetooth connect kit manufacturer and check if these parameters are available for your car

Originally Posted by Yiming

I have a flash tune that targets 22psi, let say I want to run a lower boost today and switch on jb4 map 3 which targets 18psi. Will this work?

Yes you can do that

[MrPowell]

Originally Posted by TheHouseWon

So if I have an OTS tune (bootmod3) I can run Map2 at 22psi and take advantage of all the safety features?

I run the BM3 OTS Tune (Stage 2) with my JB4 on 24psi (on Map 6). Car runs amazing!

[TheHouseWon]

Originally Posted by MrPowell

I run the BM3 OTS Tune (Stage 2) with my JB4 on 24psi (on Map 6). Car runs amazing!

I would need clutches... Ok, buying clutches now

Wife is gonna kill me.

[MrPowell]

Originally Posted by TheHouseWon

I would need clutches... Ok, buying clutches now

Wife is gonna kill me.

Lol! Yeah the clutches slipped pretty quickly on that setting! I put mine in within a few weeks of getting the back end flash.