JB4 for 2022+ Subaru WRX

[Kuruptone18]

Sorry don't know if pictures would work hopefully pdf does

[akujiki87]

Sorry don't know if pictures would work hopefully pdf does

In the app(pending you are using the app) you can email the logs to yourself as a .csv file. Post that here. The pictures and PDF are super messy and will be(my guess) annoying for them to try and sift through.

[Kuruptone18]

I did change duty bias down to 30 I'll send another log tomorrow it was set to 50 during these logs

[Kuruptone18]

Sorry for all the posts I'm new to this.... this is map 3 with 93 fuel mixed to e30 blend... duty bias on 30 I feel like I'm still running outta fuel up top can u give me suggestions and check the logs please

[dylanvbwrx]

Duty bias should be 50 across the board..

[MEATYkielbasa]

Been working on my Map 6 this weekend. Car feels great, a little bit of a learning curve getting used to the sliders and how they effect afr/timing, but easy enough with checking logs between runs.

Results are on 93 octane, panel filter and charcoal delete.

[User1029]

Map5 log with BMS intake, Perrin charge pipe, Lachute Catted ********, ETS TMIC, FOL set to 30, fuel bias set to 80 across the board

[Cannon @ BMS]

Looks like you are running pretty lean. Update to the new alpha firmware and set fuel bias to 30 or 40 in all boxes to see if it helps with the AFR's.

[akujiki87]

Looks like you are running pretty lean. Update to the new alpha firmware and set fuel bias to 30 or 40 in all boxes to see if it helps with the AFR's.

Whats a good AFR to be targeting for those E30 maps?

[dylanvbwrx]

On ethanol I'm personally targeting high 12's up to 13 until 4500 and then tapering the afr down to 11.8 by red line.

[YanisJ]

Hi,
First post, first log.
Map 2 running 94 on stock except Nameless *** back.

[lidksmy]

93 octane Map 2 - No other mods

[Terry @ BMS]

Hi,
First post, first log.
Map 2 running 94 on stock except Nameless *** back.

Seems fine to me

[Terry @ BMS]

93 octane Map 2 - No other mods

What year/model car? P91 is NSX firmware.

[lidksmy]

What year/model car? P91 is NSX firmware.

2021 Subaru Outback

EDIT: The bluetooth attachment was already connected to the JB4 - Did I receive someone else's return, someone who owned an NSX?

My order shows I ordered a JB4 for a Subaru, the box has WRX on the outside.

I've switched back to Map 0 - should I just uninstall?

[Terry @ BMS]

Just update to platform 86 firmware in the app.

https://www.youtube.com/watch?v=qYzUzBeQMQM

[Glarp]

I have been recommended some settings for my setup but I would like to have it further vetted here.

i was told in order to run 93 on map 5 with a bms intake I would need open loop 30, and fuel bias 80. Does this checkout with you guys?

also what is open loop and fuel bias?

[Terry @ BMS]

Sounds fine, fuel bias 80 is the default setting with the alpha firmware. Controls the MAF offset. Open loop controls the fuel pressure offset.

[tear728]

How water tight is the jb4? Need to spray out my engine bay

[lidksmy]

Just update to platform 86 firmware in the app.

https://www.youtube.com/watch?v=qYzUzBeQMQM

No mods, Map 2

[Cannon @ BMS]

How water tight is the jb4? Need to spray out my engine bay

While it is tight and I have washed my engine bay with it in there before, I still always prefer to edge on the side of caution and put a plastic grocery bag around it or a towel.

[ethancf55]

I have a question about the user adjustment settings. I installed the BMS intake the other day and i'm currently running map 3. My AFR was running extremely lean and I got an engine code for it. I messaged this guy about it and told me to change the fuel open loop to 30 and fuel bias to 50 across the board. It did help a lot and my AFR is good now, but i’m just wanting to know what this stuff means. What does the fuel bias and fuel open loop do exactly and how does it affect the AFR? As well as some of the other things like wastegate adaptation, PID gain, and duty bias? I want to be knowledgeable on these things, so if someone could explain these things to me i’d really appreciate it.

[Blue4n3]

I’ve found that using auto logging is helpful when doing pulls for making adjustments. However, the “disable auto logging with clutch active” function does not seem to work on this platform. Is this a known bug/unavailable feature? If it can get working that will be greatly appreciated.

[lidksmy]

I have a question about the user adjustment settings. I installed the BMS intake the other day and i'm currently running map 3. My AFR was running extremely lean and I got an engine code for it. I messaged this guy about it and told me to change the fuel open loop to 30 and fuel bias to 50 across the board. It did help a lot and my AFR is good now, but i’m just wanting to know what this stuff means. What does the fuel bias and fuel open loop do exactly and how does it affect the AFR? As well as some of the other things like wastegate adaptation, PID gain, and duty bias? I want to be knowledgeable on these things, so if someone could explain these things to me i’d really appreciate it.

What were your lean AFR numbers?

Did they occur during normal driving?

Could you post the log file?

What are they now?

Are you running Ethanol?

[ethancf55]

What were your lean AFR numbers?

Did they occur during normal driving?

Could you post the log file?

What are they now?

Are you running Ethanol?

My AFR numbers were between 13-15 in WOT near red line sometimes even higher, but mainly in the 13’s. In normal driving it stayed around 14-15. After making the adjustments to fuel bias and fuel open loop i’m sitting at around 12 in WOT. And yes I am running about 35% e85 and the rest 93. Here is one log

[lidksmy]

My AFR numbers were between 13-15 in WOT near red line sometimes even higher, but mainly in the 13’s. In normal driving it stayed around 14-15. After making the adjustments to fuel bias and fuel open loop i’m sitting at around 12 in WOT. And yes I am running about 35% e85 and the rest 93. Here is one log

FWIW, I have no mods and I switched to Map 0. The log readings at 100% throttle, show AFRs from 11.8 to 14.9. So, based on your post, you were seeing approximately the same AFRs using Map 3 as a stock vehicle.

[Cannon @ BMS]

My AFR numbers were between 13-15 in WOT near red line sometimes even higher, but mainly in the 13’s. In normal driving it stayed around 14-15. After making the adjustments to fuel bias and fuel open loop i’m sitting at around 12 in WOT. And yes I am running about 35% e85 and the rest 93. Here is one log

Looks good, although when logging, make sure to stay at 100% throttle.

[YanisJ]

Map 4 running on 94 octane and stock except CBE. Any adjustments to be made? Am I not running too rich on higher rpm? Thanks for the help.

[cg04-wrx]

Been working on my Map 6 this weekend. Car feels great, a little bit of a learning curve getting used to the sliders and how they effect afr/timing, but easy enough with checking logs between runs.

Results are on 93 octane, panel filter and charcoal delete.

Hey Meaty! Those are some nice numbers. Please share your map 6 settings. I also run 93, with charcoal delete, and would like to properly set my car up. Thanks!

[cg04-wrx]

Hey Terry, Canon and everyone else. Please take everything I say as love for you all and the product you created. I truly want to see you all do well. I work for a major design company and they talk a bit about efficiency. As of now I love the functionality and potential of the JB4 but actually pulled it off my car and am considering going back to stock because the biggest flaw is actually not the unit itself. It's the support and lack of support around "how to" tune this thing. I've read this forum many times and unfortunately there are things about Fuel Bias, Offsets, Duty bias which are so important to dialing this thing in, but there are no guides around this subject. If there are guides they are probably on other forums like the BMW platform which has had a longer following, and it's probably expected of us to go dig through their forums to find out or constantly ask the same questions to you guys over and over, and usually people just ask you all over an over. It's incredibly inefficient.

I totally understand that the wrx is a new platform, so please Speak to us like we are dumb. I find that this product was put out by tuners who are superb tuners but not the greatest teachers. It's ok, not everyone has the same gift. It's assumed that everyone out there should know what they are doing or has been following the jb4 for years, and if we want to know everything we should just read all the info that's out there as everything that we want to know is on these forums somewhere. This is causing so much inefficiency in the way this product has been handled since release. I humbly say this and hope that you all take it not as mean criticism but constructive criticism, because I truly want you all to succeed and sell more of these things. This is a great device.

First: Please develop a guide which goes into extreme detail of what each dial and button of this tuner does... Why? One might ask... If this was done it would eliminate 95% of the same questions being asked by new people over and over again. This forum would not have people constantly wondering how to use the JB4. Also there would be more people able to dial in their products better leading to happier customers. We need a very extensive guide into what the theory of tuning is, and how octane and ignition timing effects what we are trying to do. Make it the best tuners guide there is. I'm not sure how many pages it needs to be but your "install guide" was done well. Something like this but with a bit more information. But if done right, it can not only serve as a guide for our wrx but for every car you make a jb4 for (with minor tweaks for each).

second: If this guide was done, and constantly updated as you all learned more about it, you could actually spend much more time dialing in tunes and developing more products for us.

Third: Many of the short responses you all give on here and in email is totally understood by me, because you don't have time to answer 100s of questions a day via email, and the thread. This is why the guide is so important. We need this.

Things I'd like to see in the guide. Speak to us like we are dumb. I find that this product was put out by tuners who believe that everyone out there should know what they are doing. The JB4 is new to the wrx platform which means a lot of us are new to the JB4. Please release a guide which addresses every possible issue and question, and it will save you all so much time and make owning the JB4 more pleasurable. I've done 300 launches and have used 93 octane, e30, and have no clue how to dial this in other than changing a little open loop (which is not always the best). I would love to know how moving fuel bias, and duty bias changes based on knock and getting more power out of this thing. Please read this, and understand that I care. I want you all to win, but there are too many of the same questions being asked because a lot of us are confused. There aren't enough people out there in the wrx community that make videos or notes on how to tune using JB4. Please do this and you'll have more customers and people recommending this to their friends. I just want to really dial this thing in right, and the potential is there to do it, but unfortunately not an easy to read guide on how to. Thank you all!

[Terry @ BMS]

I understand the desire for it but we're just not in the teaching people how to tune business. Just because you can change a setting doesn't mean you should. And if you're not experienced already with tuning it sounds like a bad idea to me. Also keep in mind if there were settings that generally worked better than our presets then they'd already be JB4 maps.

Settings users may want to adjust are included in the first post. For those running intakes a couple custom settings are suggested including setting open loop to 30 and lowering fuel bias as needed to get AFR to an acceptable range. Beyond that nothing else is generally needed.

The JB4 interface and user adjustment are provided for people who are more advanced and looking to play around with their cars. Beyond that, we suggest you run the default settings which are designed to be safe and reliable for the vast majority of cars. And if you have a concern on the tuning you can always post up a log for Cannon or myself to review to ensure things look correct.

That said at some point we plan to make a short how to read log thread on the platform.

[Flat4]

Terry @ BMS Cannon @ BMS Hi would you mind taking a look at this map 6 log and let me know if any changes are needed? Only mods are ETS Intake w/ Sleeve.

edit: running 93 octane

[squarejournal]

Hi all! New here, I’ve been wanting to install the JB4 unit on my VB WRX the “quick dirty” way in the event I need to quickly take out. Is there a picture video guide on how to do this better? I couldn’t follow the written guide well enough to figure out how to do it. Thanks y’all, happy to be here!

[lidksmy]

Hi all! New here, I’ve been wanting to install the JB4 unit on my VB WRX the “quick dirty” way in the event I need to quickly take out. Is there a picture video guide on how to do this better? I couldn’t follow the written guide well enough to figure out how to do it. Thanks y’all, happy to be here!

IMO
1. Zip tie the JB4 near the battery
2. Do not connect the turbo nor the fuel solenoid cables.
3. Do not zip tie any connected leads

[dylanvbwrx]

Flat4 Hey Brother you're too rich up top. move your fuel bias up to 75 across the board and see how that feels also make sure you're on the most newest firmware alpha

[dylanvbwrx]

cg04-wrx Hey brother, if you're set on making a Map 6 I can help you out, but don't just copy and paste someone else's. Elevation and location play a big part in those numbers being correct, so if you really want to make one. I suggest with starting very low boost and slowly progressing happy to help any way I can.

[Flat4]

Flat4 Hey Brother you're too rich up top. move your fuel bias up to 75 across the board and see how that feels also make sure you're on the most newest firmware alpha

Thanks I'll do that! What's the process for updating the firmware? I've gone in and seen the options, but not too sure on how to load them.

[dylanvbwrx]

Flat4 settings, view tuning, firmware, browse, 2022 wrx, Alpha, then flash!

[Cannon @ BMS]

Flat4 settings, view tuning, firmware, browse, 2022 wrx, Alpha, then flash!

[Fluffysamurai]

Hello everyone. I just got my JB4 on Monday, together with the BMS intake. I also have factory Sti performance exhaust. (I did not install it so I don't know if its just the mufflers or full catback).
Here is my first attempt. any advice based on this limited information would be appreciated. thanks in advance.

[Cannon @ BMS]

Please upload another log and make sure to have your foot to the floor throughout the entirety of the pull.

[squarejournal]

After installing, has anyone noticed a degradation in MPG?

Context:

CVT/SPT
91 octane
Cobb TMIC
Axelback

All connections installed except EWG.

[tear728]

cg04-wrx Honestly it's not very difficult to do in my experience - I just had to have some guts to change the values on my own and figure out how to dial it in.

You basically just need to log runs, check that AFR and ignition look okay, and adjust Boost and Fuel Bias in the RPM ranges that need a change as needed. This means that AFR curves and ignition curves look correct.

Keep in mind, running less boost in some cases will make more power than if you ran more boost. This is because if you want to run higher boost, you will need to add more fuel (which is done by lowering the fuel bias) to dial in your AFR. However this can affect timing which means less power. Basically the goal is to just find that sweet spot where everything looks good and making appropriate power.

Here is a micro-explanation of what the values are and do, from my own understanding. I'm not a Jb4 employee or Jb4 engineer, so I can't say for certain how accurate any of this info is:


Fuel Bias is a value that adjusts the quantity of fuel being used. I don't know the actual calculations but just thinking about it mathematically, here is an example of what adjusting Fuel Bias might do when using the 0 to 100 scale from before the MAF scaling update in v.6:

Fuel Output = Fuel Trim + (100 - Fuel Bias). As you can see setting Fuel Bias to 100 would mean there is no change to the Fuel Output since 100 - 100 = 0. If you set it to 0, then you would be adding 100 to the Fuel Trim. Lower Fuel Bias means more fuel, high Fuel Bias means less fuel.

The main change in v.6 is that its no longer on a 0 to 100 scale, its on a 50 to 80 scale with the allowance of "negative" fuel bias. If you transformed the 50 to 80 scale to the 0 to 100 scale then anything lower than 50 would be negative.


Boost is pretty self-explanatory - what is the target boost psi you want to achieve.


Open Loop is when the fuel system is operating with an Open Loop. Closed Loop means that the ECU relies on values from the O2 sensor to adjust fuel trims (which creates a closed feedback loop). Therefore Open Loop means that this feedback loop is no longer used. This leads to more constant fuel values rather than variable ones. This is desired when you are taking in more air (like with an intake), since you want to have more constant fuel quantities to match it. The higher the values used for Open Loop, the smoother and flatter the AFR curve in your logs will be. Form what I understand, Open Loop is a value that should stay the same for the most part (and should only be touched when you have an intake) typically with 30 as a max. I've experimented with higher values but they eventually throw a P0181 code - even a value of 33 will throw a code at some point.

Duty Cycle is basically how often a circuit is open vs closed. The higher the value is, the longer the circuit is open. This is used for the waste gate, so you are adjusting rates for how the waste gate opens and closes, i.e adjust the rate at which the turbo spools.

[Roverhound]

Good post and explanation. I would love to see this expanded on.

[Cannon @ BMS]

cg04-wrx Honestly it's not very difficult to do in my experience - I just had to have some guts to change the values on my own and figure out how to dial it in.

You basically just need to log runs, check that AFR and ignition look okay, and adjust Boost and Fuel Bias in the RPM ranges that need a change as needed. This means that AFR curves and ignition curves look correct.

Keep in mind, running less boost in some cases will make more power than if you ran more boost. This is because if you want to run higher boost, you will need to add more fuel (which is done by lowering the fuel bias) to dial in your AFR. However this can affect timing which means less power. Basically the goal is to just find that sweet spot where everything looks good and making appropriate power.

Here is a micro-explanation of what the values are and do, from my own understanding. I'm not a Jb4 employee or Jb4 engineer, so I can't say for certain how accurate any of this info is:


Fuel Bias is a value that adjusts the quantity of fuel being used. I don't know the actual calculations but just thinking about it mathematically, here is an example of what adjusting Fuel Bias might do when using the 0 to 100 scale from before the MAF scaling update in v.6:

Fuel Output = Fuel Trim + (100 - Fuel Bias). As you can see setting Fuel Bias to 100 would mean there is no change to the Fuel Output since 100 - 100 = 0. If you set it to 0, then you would be adding 100 to the Fuel Trim. Lower Fuel Bias means more fuel, high Fuel Bias means less fuel.

The main change in v.6 is that its no longer on a 0 to 100 scale, its on a 50 to 80 scale with the allowance of "negative" fuel bias. If you transformed the 50 to 80 scale to the 0 to 100 scale then anything lower than 50 would be negative.


Boost is pretty self-explanatory - what is the target boost psi you want to achieve.


Open Loop is when the fuel system is operating with an Open Loop. Closed Loop means that the ECU relies on values from the O2 sensor to adjust fuel trims (which creates a closed feedback loop). Therefore Open Loop means that this feedback loop is no longer used. This leads to more constant fuel values rather than variable ones. This is desired when you are taking in more air (like with an intake), since you want to have more constant fuel quantities to match it. The higher the values used for Open Loop, the smoother and flatter the AFR curve in your logs will be. Form what I understand, Open Loop is a value that should stay the same for the most part (and should only be touched when you have an intake) typically with 30 as a max. I've experimented with higher values but they eventually throw a P0181 code - even a value of 33 will throw a code at some point.

Duty Cycle is basically how often a circuit is open vs closed. The higher the value is, the longer the circuit is open. This is used for the waste gate, so you are adjusting rates for how the waste gate opens and closes, i.e adjust the rate at which the turbo spools.

[mcononie]

Terry @ BMS Cannon @ BMS Can you take a look at my map 6 on 93 (2 pulls in file)? Dylan helped me with this one. Car is totally stock.

[Cannon @ BMS]

Terry @ BMS Cannon @ BMS Can you take a look at my map 6 on 93 (2 pulls in file)? Dylan helped me with this one. Car is totally stock.

dylanvbwrx what's with the boost spike setup?

mcononie I would advise to return to map 2 for now until we hear from Dylan.

[dylanvbwrx]

mcononie

3080	11.8	100	64	100	12.7
3184	11.6	100	64	100	13.1
3327	11.9	100	65	100	13.1
3440	12.1	100	66	100	13
3529	12.1	100	66	100	13
3620	12.2	100	68	100	13
3705	12.1	100	70	100	13
3793	12.8	100	69	100	13.2
3963	12.5	100	71	100	13
4058	12.3	100	72	100	12.6
4157	12.6	100	79	100	12.4
4245	13.8	100	88	100	12.4
4474	17.5	100	99	100	10.9
4582	19.3	100	99	100	11.9
4699	19.3	100	98	100	11.9
4815	18.7	100	98	100	12.1
4898	17.9	100	98	100	12.1
5013	17.7	100	99	100	12.2
5136	17.6	100	98	100	12.2
5211	17.7	100	98	100	11.8
5296	17.2	100	98	100	11.8
5437	16.7	100	98	100	11.4
5514	16.7	100	98	100	11.4
5593	16.6	100	96	100	12.1
5716	15.2	100	95	100	12.3
5801	15.2	100	94	100	12.3
5881	14.2	100	90	100	11.9
6009	14.2	100	89	100	11.9

It looks like the Waste gate is maxed out I would scale it, so it's not hitting high 90's before red line
3000 rpm 50 duty bias
3500 rpm 55 duty bias
4000 rpm 60 duty bias
4500 rpm 65 duty bias
5500 rpm 70 duty bias
6000 rpm 75 duty bias

@cannon this was a high boost map peaking and then tapering happy to make the map 6 anyway he wants lower peak no taper etc

[mcononie]

I've only been running map 6 to work on dialing in the numbers. Using map2 for all my driving.

Will work on smoothing out the boost with Dylan.

[dylanvbwrx]

mcononie We will work together this weekend and get you right. If you ever need anything shoot me a text, I'm happy to help.