Already flash-tuned but can I add JB4

[epiphanyray]

So, I am already tuned by Mission Performance and I love my tune. However I am wanting to try jB4 and the flexibility it offers from bluetooth, logging etc.

Can I simply install JB4+bcm on top of what i currently have? Will car respond and override tune to jb4 commands or how exactly does this work?

Or do i need to ask mission to tune my car back to stock before installing?

Thanks

[Nikolov]

You can install it and set it to map 0 (disabled).

[epiphanyray]

Originally Posted by Nikolov

You can install it and set it to map 0 (disabled).

Thanks, that is what i was told as well. However if i decide to set one of the maps like map 2 or a custom map will jb4 kick in? Or does the ecu tune override anything else

[Dandadda]

Originally Posted by epiphanyray

Thanks, that is what i was told as well. However if i decide to set one of the maps like map 2 or a custom map will jb4 kick in? Or does the ecu tune override anything else

Your flash tune will always be the primary tune since its done on the ecu level. For example if you are tuned for 23 psi with the your flash and then stack jb4 using map 1 you will see boost at around 27psi because jb4 map 1 adds about 4 more psi on top of whatever your ecu is running. I run bm3 with JB4 stacked on map1 and I get about 26-27lbs of boost. Hope this answers your question.

[epiphanyray]

Originally Posted by Dandadda

Your flash tune will always be the primary tune since its done on the ecu level. For example if you are tuned for 23 psi with the your flash and then stack jb4 using map 1 you will see boost at around 27psi because jb4 map 1 adds about 4 more psi on top of whatever your ecu is running. I run bm3 with JB4 stacked on map1 and I get about 26-27lbs of boost. Hope this answers your question.

That really answers my question. How about jb4s boost control for each gear and rpm? What happens there?

[Mike@N54Tuning.com]

Yes you can add in the JB4 for all of its features, and use it to tweak your flash mapping. Start with a JB4 log on map4 (flash only tuning) to evaluate and then post the log to n54tech so the guys at BMS can help you optimize it.

Mike

[TheHouseWon]

I run JB4/BCM map 2 and OTS tune from BM3 and it runs like a beast. Didnt know map1 added boost to the flash, I guess the fact that it says "additive" is why.

[allmotor_2000]

Originally Posted by TheHouseWon

I run JB4/BCM map 2 and OTS tune from BM3 and it runs like a beast. Didnt know map1 added boost to the flash, I guess the fact that it says "additive" is why.

Only Map 0 and Map 4 don't add boost (unless you add a zero boost Map 6).

[epiphanyray]

Originally Posted by allmotor_2000

Only Map 0 and Map 4 don't add boost (unless you add a zero boost Map 6).

But does this mean if I stack a JB4+BCM on top of my MISSION PERFORMANCE tune, I can't play with boost by gear/rpm functionality provided by Jb4?

The reason I ask is if boost by gear/rpm is already setup in the ECU TUNE, then I guess JB4 cant control that?

[allmotor_2000]

Originally Posted by epiphanyray

But does this mean if I stack a JB4+BCM on top of my MISSION PERFORMANCE tune, I can't play with boost by gear/rpm functionality provided by Jb4?

The reason I ask is if boost by gear/rpm is already setup in the ECU TUNE, then I guess JB4 cant control that?

You can do boost by gear, except you cannot go BELOW whatever is set by the flash tune (for each gear).

[epiphanyray]

So, just for the sake of undersanding, if my current tune is setup at 18psi of boost at 3000 RPM in second gear, I would have to tell JB4 to do 2psi of boost at 3000 rpm in second gear as well to get to a desired 20psi of boost second gear 3000 rpm?

Next question is: If i used Jb4 do so logs of the car's performance, will it take into account the tune as well? What I mean is if jb4 will actually log the 20psi of boost that the car is making and show the ACTUAL cars perofrmance/boost/gear/rpm also taking into consideration what the tune is doing?

[allmotor_2000]

Depends which JB4. The Stage 2 (with BCM) does not use additive boost, so you give the absolute target. So, if flash is 18psi and you want 20psi, enter 20psi.

Yes, JB4 reads actual pressure, actual trims, actual AFR etc. There is a DME_TARGET value that shows what the ECU is trying to achieve (stock or flash).

[TheHouseWon]

Originally Posted by Dandadda

Your flash tune will always be the primary tune since its done on the ecu level. For example if you are tuned for 23 psi with the your flash and then stack jb4 using map 1 you will see boost at around 27psi because jb4 map 1 adds about 4 more psi on top of whatever your ecu is running. I run bm3 with JB4 stacked on map1 and I get about 26-27lbs of boost. Hope this answers your question.

Originally Posted by allmotor_2000

Depends which JB4. The Stage 2 (with BCM) does not use additive boost, so you give the absolute target. So, if flash is 18psi and you want 20psi, enter 20psi.

I have a tune with 22psi. If I stack JB4 /BCM Map 1, will psi be 26-27? The above quotes seem to coinflict...

[allmotor_2000]

You won't see 27psi with flash @ 22psi and JB4/BCM @ Map 1... there is no conflict.

The first assessment is wrong:

1. 26-27psi needs meth... Map 1 ain't gonna cut it
2. Map 1 doesn't even use the BCM... so how is it going to achieve 27 psi
3. While Map 1 may target 2-3 psi (like a stage 1), boost won't reach target

[TheHouseWon]

Thanks, allmotor

[epiphanyray]

Originally Posted by allmotor_2000

Depends which JB4. The Stage 2 (with BCM) does not use additive boost, so you give the absolute target. So, if flash is 18psi and you want 20psi, enter 20psi.

Yes, JB4 reads actual pressure, actual trims, actual AFR etc. There is a DME_TARGET value that shows what the ECU is trying to achieve (stock or flash).

So just to be clear. Jb4 will in fact control actual boost even if you have ecu tune?

So if i am looking for 28 psi of boost i use custom map on jb4 and forget about boost values from ecu tune? Does this apply to boost by gear and rpm?

Essentially what you are saying is that jb4 will pretty much ignore ecu flash tune values?

[allmotor_2000]

Originally Posted by epiphanyray

So just to be clear. Jb4 will in fact control actual boost even if you have ecu tune?

So if i am looking for 28 psi of boost i use custom map on jb4 and forget about boost values from ecu tune? Does this apply to boost by gear and rpm?

Essentially what you are saying is that jb4 will pretty much ignore ecu flash tune values?

JB4 can 'add' to the flash tune, but it can't subtract. Yes, with Map 6, you can do boost by RPM.

[Dandadda]

For those that are running BOOTMOD3 and have Jb4 stacked can you do a log or a pull and tell me what your boost readings are on map1? mine reads 26-27psi when i log it via jb4 on map1. on the base Bootmod3 tune without jb4 I'm seeing 22-23psi when i log. I thought map 1 with jb4 w/bcm was an additive (+3 to 4 psi) map2 was absolute? Am i understanding this wrong? I'm curious as to what others are seeing.

[TheHouseWon]

Originally Posted by Dandadda

For those that are running BOOTMOD3 and have Jb4 stacked can you do a log or a pull and tell me what your boost readings are on map1? mine reads 26-27psi when i log it via jb4 on map1. on the base Bootmod3 tune without jb4 I'm seeing 22-23psi when i log. I thought map 1 with jb4 w/bcm was an additive (+3 to 4 psi) map2 was absolute? Am i understanding this wrong? I'm curious as to what others are seeing.

Will do...

On another note, the car pulls and runs better on Map 2 with Bootmod3 OTS then it does with just the base OTS map. I wonder why?? Not a complaint, I'm quite happy with the way it runs, just curious.

[FSociety]

Originally Posted by TheHouseWon

Will do...

On another note, the car pulls and runs better on Map 2 with Bootmod3 OTS then it does with just the base OTS map. I wonder why?? Not a complaint, I'm quite happy with the way it runs, just curious.

Log both and post it

[TheHouseWon]

Originally Posted by FSociety

Log both and post it

When a cop gets me for speeding I'm going to tell him I'm logging scientific data for M5post.com

[FSociety]

Originally Posted by TheHouseWon

When a cop gets me for speeding I'm going to tell him I'm logging scientific data for M5post.com

Just say u wanted to hear your exhaust lol