Jb4 turning to map 0

[Dylan English]

Hey everyone. I have this log. I was wondering if anyone could tell me why my Jb4 keeps turning to map 0 when I’m full throttle with e30 on map 4. I have injen intakes, velossa tech snorkels, hks bov, and hks plugs.
Thanks in advance!

 

[Thomby]

You don't really have much individual cylinder timing correction, but your log is a ton of quick WOT bursts in between low/closed throttle. It also shows Map 2. Find somewhere you can slow down to say 20-25mph and floor it up to 70-80 or whatever you can safely hit.

You want to pull through at least a couple gears so we can see timing advance, trims, and fuel pressure through the rev range -- just let the auto log kick in (I think 70 or 80% throttle triggers it) instead of manual logging where you'll have a ton of off-throttle filler.

 

[Baluchitherium4]

Go into the JB4 app and see what the last safety is. That'll give you an idea of where to look for the issue.

 

[Dylan English]

You don't really have much individual cylinder timing correction, but your log is a ton of quick WOT bursts in between low/closed throttle. It also shows Map 2. Find somewhere you can slow down to say 20-25mph and floor it up to 70-80 or whatever you can safely hit.

You want to pull through at least a couple gears so we can see timing advance, trims, and fuel pressure through the rev range -- just let the auto log kick in (I think 70 or 80% throttle triggers it) instead of manual logging where you'll have a ton of off-throttle filler.

You don't really have much individual cylinder timing correction, but your log is a ton of quick WOT bursts in between low/closed throttle. It also shows Map 2. Find somewhere you can slow down to say 20-25mph and floor it up to 70-80 or whatever you can safely hit.

You want to pull through at least a couple gears so we can see timing advance, trims, and fuel pressure through the rev range -- just let the auto log kick in (I think 70 or 80% throttle triggers it) instead of manual logging where you'll have a ton of off-throttle filler.

 

[MetalMania80]

1. go for the latest firmware.
2. change the default wastegate position from 100 to 50

 

[Dylan English]

1. go for the latest firmware.
2. change the default wastegate position from 100 to 50

Ok. What does that do? I’m just trying to learn all this stuff. I’m pretty new to it all

 

[MetalMania80]

1. it's always good to have the latest firmware,
2. it sets the default wastegate position, don't play with that without knowing how to read logs. Set it even for default 0 and check if everything is ok. Then, you can increase it step by step.
3. check your fuel wire connections. The last safety was due to fuel trim variance.

 

[Dylan English]

1. it's always good to have the latest firmware,
2. it sets the default wastegate position, don't play with that without knowing how to read logs. Set it even for default 0 and check if everything is ok. Then, you can increase it step by step.
3. check your fuel wire connections. The last safety was due to fuel trim variance.

Ok thank you! What does the waste gate do? How does it affect things with it being at 100 rather than 0

 

[Thomby]

Ok thank you! What does the waste gate do? How does it affect things with it being at 100 rather than 0

The wastegate itself is a port that bypasses the exhaust turbine when you don't need all the exhaust spooling it faster (because you're at max boost, or are cruising out of boost). Wastegate duty cycle is how far closed the valve is, so 100 would force all exhaust through the turbine and 0 would bypass as much as possible.

For the settings in the app, here's BMS' own description:

Stinger 3.3L EWG Connectors - JB4tech.com - International Turbo Tuning Discussion

What are the EWG connectors? They are optional connections that attach the JB4 to the wastegate actuators on each turbo. By attaching directly in this way the JB4 is able to increase or decrease WGDC in a dynamic way to improve boost targeting. The benefits are increased turbocharge response...

www.jb4tech.com

- If "default wastegate position" is absolute position (BMS writeup only mentions scaling, but it's from 2020) your 100 would be very aggressive and likely hurt mileage. Mine is 0 rather than 50.

- WGDC is an adjustment to the car's signal, where 50 is no adjustment, 0 is -15%, and 100 is +15%. Yours goes straight to 99 which I think is due to your FF (feed forward) setting of 60, which is aggressively scaling up the car's WGDC signal and probably causing overboost that kicks you to Map 0.

- By comparison, my logs with a default FF setting of 50 show WGDC going into the 70s or 80s during WOT -- I don't have EWGs but on Map 4/5 am asking for more boost than stock, so I think the JB4 is trying to close the WGs more quickly to spool faster.

Maybe @MetalMania80 or @AWDGT2 or @Terry@BMS can confirm my above points, but I think you want DWP at 0 and FF at 50, then dial down FF 5 at a time if you still have overboost.

 

[MetalMania80]

I saw a post by Terry, he said we can play with "default wastegate position" to make our car "faster" in response. I played with that setting 40-60. Of course, it can cause some problems.

FF can be used to deal with over/under boost. I set it looking at dme_bt/ ECU psi difference. Currently, mine is set at 65.

 

[Thomby]

I saw a post by Terry, he said we can play with "default wastegate position" to make our car "faster" in response

So would you interpret the default 0 setting as completely open? For many settings it means off/disabled, but I don't know if the car's OEM default is fully open, free to move, or some intermediate position. Any idea? A shame the JB4 doesn't have a wastegate position monitor.

 

[Dylan English]

Thank you @Thomby and @MetalMania80 !
It still switched down to map 4 when I switched the waste gate to 50. Here’s the log

 

[Thomby]

It still switched down to map 4 when I switched the waste gate to 50. Here’s the log

That log only has a few rows of 100% throttle, and I have no idea what's going on with your cylinder-level timing corrections (14, 22, 37, etc). I do see that your FF is 60, and you have a bunch of Map 6 values...is that what you were trying to run and you're saying it switched down to Map 4? Because I wasn't aware the JB4 would do that, just switch to Map 0 (stock) if you exceed the hard boost limit (I think default value is 23psi or so).

I would suggest removing any WG offset values, leaving DWP at 0, setting FF to 50, and clearing out those map 6 adjustments. Then run a clean log on Map 2, Map 3, and Map 4. Meaning, find a road where you can slow down to around 20-25mph, put your foot to the floor, and stay WOT until 70-80mph (or whatever you can reasonably do).

 

[Dylan English]

That log only has a few rows of 100% throttle, and I have no idea what's going on with your cylinder-level timing corrections (14, 22, 37, etc). I do see that your FF is 60, and you have a bunch of Map 6 values...is that what you were trying to run and you're saying it switched down to Map 4? Because I wasn't aware the JB4 would do that, just switch to Map 0 (stock) if you exceed the hard boost limit (I think default value is 23psi or so).

I would suggest removing any WG offset values, leaving DWP at 0, setting FF to 50, and clearing out those map 6 adjustments. Then run a clean log on Map 2, Map 3, and Map 4. Meaning, find a road where you can slow down to around 20-25mph, put your foot to the floor, and stay WOT until 70-80mph (or whatever you can reasonably do).

I’m sorry. I meant it switched down to map 0. I’m not sure about the map 6 stuff cause it was never on that map. I was only on map 4 when it switched down to map 0

 

[MetalMania80]

Do you use the latest firmware? Change the setting to show cyl 2-6 as timing corrections. Make a proper log.

 

[Dylan English]

Do you use the latest firmware? Change the setting to show cyl 2-6 as timing corrections. Make a proper log.

Yes I use the latest firmware. And I will make a better log sometime soon hopefully. It snowed where I live so all the roads are either wet or snowy.

 

[Dylan English]

Do you use the latest firmware? Change the setting to show cyl 2-6 as timing corrections. Make a proper log.

I made this log this morning. Sorry for the long wait. It’s been snowy and I’ve also had my car in the shop for the last week

 

[Thomby]

I made this log this morning. Sorry for the long wait. It’s been snowy and I’ve also had my car in the shop for the last week

I don't see obvious timing/knock corrections, but there are a few things going on here, and I'm still an amateur but here are some initial observations:

- You still have Ign2-6 set to absolute timing advance instead of relative to Ign1, so you need to find and revert that setting

- Did you check your fuel/O2 sensor wires yet? Your "trims" & "trim2" diverge throughout the run, eventually differing by 20, and "fuelen" (fuel enrichment) hits 100, right around the time it kicks out of Map 4. A trim difference of >15 will throw a safety (I don't know the LastSafety codes but you have a 5 there)

- Your E85 shows 2 all the way down, and I thought that even without a Fuel-It kit the JB4 does a pretty good job estimating your mix from the O2 reading. Maybe also related to your O2 readings?

- Your ECU never calls for more than 9.4 psi of boost, when I'd expect more like 12-13, but you also have IAT steady at 32 the whole time so maybe that's the load formula adjusting for very dense air...was it below freezing out? The fact that it doesn't waver from 32 makes me think it's pegged to a minimum value.

 

[MetalMania80]

Make a log with map0. E-content needs a special set. Your safety issue is trims variance. At some points, your throttle goes close.

We will see how it behaves with jb4 disabled. It could be needed to read your trims settings (voltage).