Kia/Genesis 3.5t JB4 Development

[jgaines3200]

Is this compatible with the 3.5 G80 Sport?

It is...but just be aware it's beta and definitely causes some hiccups in it's current state pretty often when you stomp it....As long as you don't dig into the throttle you won't notice the issues. Unfortunately when you stomp on it you get very unreliable power that cuts out forcing you to let off and re apply throttle to get back into the boost.

[ratedmmm]

GV70 3.5t JB4

Haven't had any driveability issues, just can't get it to connect via bluetooth.

[jgaines3200]

Haven't had any driveability issues, just can't get it to connect via bluetooth.

I’m assuming you haven’t ran anything other than map 1….Soon as you run higher boost it will start cutting out. Map 2 works pretty ok most of the time but you may get occasional boost cut and map 3 and beyond will cut the boost pretty often.

[RamAir]

Has there been any further development on finding a resolution to the MAP 2 and 3 issues? I am in the process of installing my unit and would like to know if I should expect issues running MAP 2 or above on 93 octane fuel.

[Terry @ BMS]

Has there been any further development on finding a resolution to the MAP 2 and 3 issues? I am in the process of installing my unit and would like to know if I should expect issues running MAP 2 or above on 93 octane fuel.

We have not made any changes lately. Some cars work nicely with map2 and map3, others report mild boost oscillation, so its on a car by car basis currently until we can get a problem car on the dyno here to get to the bottom of the issue.

[dareckibmw]

"Download the install guide" link in first post doesn't work. Can you guys fix it, please?

[RamAir]

As far as I know, this is the most recent install guide dated 2/16/2022

https://www.jb4tuned.com/instructions/JB4_V2_V3_V4_Guide.pdf

[dareckibmw]

As far as I know, this is the most recent install guide dated 2/16/2022

https://www.jb4tuned.com/instruction...3_V4_Guide.pdf

Thanks!

[Terry @ BMS]

I'll update the link in the first post.

[RamAir]

I thought I would update with my experience running the JB4 on my 21 GV80 3.5T. I experienced a bit of difficulty getting mine to “talk” to the car, but I finally figured it out. For some unknown reason, I need to hook mine up to the two TMAP sensors different than what Burger states is correct. For me, I need to hook up the yellow/red connector to the front TMAP (front of engine, down by the radiator) and the brown/black connector to the TMAP on the top of the engine underneath the engine cover. Apparently, this is backwards. When I hooked it up the way the Burger instructions state, my vehicle goes into limp mode and sets a CEL showing codes PC60B and PC609. After a week of trying to figure it out, I contacted the individual who owned the JB4 before me, and he was certain he hooked it up the opposite way. So, I tried his suggestion and sure enough…it works fine now! I can’t understand what’s going on…is mine (being an early model) wired differently than current units? It makes no sense.

Anyway, I tested out Map 1 and it’s running fine. No CEL and no stuttering. I observed a steady 15 psi of boost. I can’t say I had much luck with Map 2. Like others, it’s causing issues. Nearly every pull, it cuts out and the CEL blinks (telling me it’s sensed a misfire). I’m running 93 octane as well. I haven’t been able to see what kind of boost it’s making as it won’t hold and pulls power as soon as it senses a misfire. I suspect the issue is spark plugs, but I can’t say for sure. It would be nice if Burger can get a GV80 onto the dyno and figure this out. As it is, I won’t trust the Map 2 and will stick with Map 1 “tune”.

[Terry @ BMS]

That might be a red herring, as we've found they run best with yellow up top, brown in front, but if its working for definitely keep it like that!

[RamAir]

For those experiencing stumbling and power loss due to misfiring plugs when running Map 2, these plugs have been confirmed to be a direct replacement for the OEM plugs. They are one heat range colder and are iridium. The NGK part number is 97537. They have been tried in a 2021 3.5 T GV80 and worked perfectly. Be forewarned…they are not cheap!

W
the second part number, 97278 is two heat ranges colder. While it has not been tried yet, for those running ethanol and even higher levels of boost, it may work. It shares all of the same dimensions as the OEM plug. I believe it uses a conventional (non platinum) ground strap and may require more frequent replacing.


In my research, I discovered the 97537 is a commonly used plug in the Subaru/Toyota twins…BRZ and 86. As such, they frequently upgrade to this plug when adding power. They also us the following Denso plug, which appears to be a near direct replacement for the NGK 97537. The one thing I see different is it uses a 10k ohm resistor instead of a 5j ohm resistor. I don’t think this will affect anything as the resistor is designed to prevent interference in electronics (radio, etc). If anything, it will be a “quieter” plug and won’t affect the vehicle’s electronics at all.

Denso
ZXE27HBR8 (3536)
Precious metal Z: 0.55mm diameter iridium
Thread and hex XE: 12x14.0
Heat range: 27
Reach: it’s confusing but you’re looking for 26.5mm total length,
19.0 mm
(Electrode position: 8.5 mm)
26.5 mm
B: triple ground electrode
R: 10k ohm resistor
8: 0.8mm/0.032” gap

Denso heat range 27 is equivalent to NGK heat range 9. I believe the OEM Hyundai plug
P/n 1887709085 is heat range 8.

[jgaines3200]

For those experiencing stumbling and power loss due to misfiring plugs when running Map 2, these plugs have been confirmed to be a direct replacement for the OEM plugs. They are one heat range colder and are iridium. The NGK part number is 97537. They have been tried in a 2021 3.5 T GV80 and worked perfectly. Be forewarned…they are not cheap!

W
the second part number, 97278 is two heat ranges colder. While it has not been tried yet, for those running ethanol and even higher levels of boost, it may work. It shares all of the same dimensions as the OEM plug. I believe it uses a conventional (non platinum) ground strap and may require more frequent replacing.


In my research, I discovered the 97537 is a commonly used plug in the Subaru/Toyota twins…BRZ and 86. As such, they frequently upgrade to this plug when adding power. They also us the following Denso plug, which appears to be a near direct replacement for the NGK 97537. The one thing I see different is it uses a 10k ohm resistor instead of a 5j ohm resistor. I don’t think this will affect anything as the resistor is designed to prevent interference in electronics (radio, etc). If anything, it will be a “quieter” plug and won’t affect the vehicle’s electronics at all.

Denso
ZXE27HBR8 (3536)
Precious metal Z: 0.55mm diameter iridium
Thread and hex XE: 12x14.0
Heat range: 27
Reach: it’s confusing but you’re looking for 26.5mm total length,
19.0 mm
(Electrode position: 8.5 mm)
26.5 mm
B: triple ground electrode
R: 10k ohm resistor
8: 0.8mm/0.032” gap

Denso heat range 27 is equivalent to NGK heat range 9. I believe the OEM Hyundai plug
P/n 1887709085 is heat range 8.

I'm pretty certain the issue isn't misfiring unless your actually getting timing pulled or a check engine light....which I'm definitely not experiencing either of. I'm able to run all the way up to Map 5 without misfires on 93 octane E-10. However, anything after Map 1 gets progressively worse in terms of boost cutting in and out. I don't know if it's a fuel starvation issue or what but it's definitely not misfires. I've even tried adding octane booster to raise the fuel to 96 octane to see if it helped and it didn't do a thing.

[RamAir]

It’s definitely misfiring. I get a flashing CEL and it goes into limp mode. I confirmed this with a JB4 tech as well who recommended colder plugs. I am curious…what firmware are you running? I use the last stable firmware. I am waiting for the Beta to be finalized before I use it.

[lilreed2136]

Still no fix for Map 2 boost cutting out? Also sometimes my cameras flicker with the JB4 hooked up. What can be the cause of that?

[Terry @ BMS]

Still no fix for Map 2 boost cutting out? Also sometimes my cameras flicker with the JB4 hooked up. What can be the cause of that?

The camera flicker has something to do with the OBDII connection I think. Sorting that out is on my to-do list!

No map2 changes yet. Works for some cars, not for others. The last 3.5 we had in the office had zero issues so we need to get a problem car in here to further sort that out.

[lilreed2136]

Ok so quick question. Once i load my map onto the JB4 can i unhook the Bluetooth connect from OBD? I would like to leave it disconnected unless I’m data logging or changing maps.

[Terry @ BMS]

Ok so quick question. Once i load my map onto the JB4 can i unhook the Bluetooth connect from OBD? I would like to leave it disconnected unless I’m data logging or changing maps.

The tuning is better with it attached but its optional.

[lilreed2136]

Anyone change plugs on here? Trying to see if it will help with the boost cuts in high rpm. Sucks we spend $750+ dollars and can’t use the JB4 reliably. Terry not trying to be a douche but can we get some updates? Is anyone looking into the issue? I know you say you need a problem car on the dyno but shouldn’t logs tell you something? Do you need more logs?

[Terry @ BMS]

Not come across any issues with spark plugs on the platform, but can't hurt to regap down to 0.022" if you want to try it.

[lilreed2136]

Ok well i don’t want to waste my time if you don’t think it’s plugs. what do you think the issue is? Is it something that can’t be detected on a log?

[lilreed2136]

So i did some testing on a map 6 tune i tapered the boost down from 5psi to 3psi at 4k RPMs and it eliminated the boost cutout and misfires on Map 2.

[lilreed2136]

Ok scratch the last post that didn’t completely fix the issue. But i was told by another JB4 user to disconnect the front sensor with the brown wire and hook up the factory connection and to leave the yellow red connector on top hooked up. Does this have any effect on the maps power output? is it safe to run it this way long term? Any one else done this yet? This seems to have worked for others just trying to make sure.

[dareckibmw]

2023 Genesis GV70 3.5tt here.....
Ok. I was able to do some hard pulls 0-90+ as instructed by Terry, with only red/yellow connector attached on top. It seems, the surge (waving) is gone.
Can you guys check my log, please. I always run on 93 octane and Map2.
Also, I would like to know if it's safe to run this "setup" since the other connector isn't hooked up. I don't even know what it's for? All I know, I'm hitting ~15 psi of boost, and before it was ~19psi.

[lilreed2136]

Would also like to know what this changes. I know it helps with the boost oscillation but how is it doing it? Boost levels also lowered on mine as well. Can we use map 3 on this setup to get more boost?

[Bkp95]

Lilreed/Dareck, thanks for posting feedback on this topic. I will probably be entering the jb4 world soon too.
this is the first "fun" car for me since my 1.8t jetty days nearly 20 yrs ago! (GoAPR chip among other mods)
Did both of you switch to colder plugs while addressing these issues? It was a must for me on the 1.8t to avoid limp mode...

[lilreed2136]

Didn’t get colder plugs because we were told by Terry that they were sufficient enough.

[dareckibmw]

Same here. Running on a factory plugs.

[Terry @ BMS]

2023 Genesis GV70 3.5tt here.....
Ok. I was able to do some hard pulls 0-90+ as instructed by Terry, with only red/yellow connector attached on top. It seems, the surge (waving) is gone.
Can you guys check my log, please. I always run on 93 octane and Map2.
Also, I would like to know if it's safe to run this "setup" since the other connector isn't hooked up. I don't even know what it's for? All I know, I'm hitting ~15 psi of boost, and before it was ~19psi.

With the 3.5t having both connectors on does let us run higher boost levels. But for cars that have issues with it, this has proven to be a good alternative for now. Still quicker than factory.

[dareckibmw]

With the 3.5t having both connectors on does let us run higher boost levels. But for cars that have issues with it, this has proven to be a good alternative for now. Still quicker than factory.

You didn't mention anything about what's the log says that I posted. Is it safe to drive like that? Should we have worried about it?

[Gv80man]

Same problem. I have bought ngk racing spark plugs one step colder then and at 0.022 gap and on cold start it’s rough then it straights out. I thought this would fix the problem on higher maps but I did not. I feel like it’s starving for fuel.

[lilreed2136]

Yeah i don’t think they are even looking into it at all. We’re just stuck with a $750 dollar device that works partially. With no update or support to help figure it out. I was Told to unhook the brown connector at the front of the engine. That eliminated the boost cutting in and out but it doesn’t feel any different from stock running it that way. I only run map 1 and at WOT it still cuts boost out unless i go 75% throttle.

[Bkp95]

Any updates from Terry/Burger on the recent issues posted here? Have they been able to test other 3.5t vehicles in the past few months?
I'm hesitant to pull the trigger on the jb4 until I hear some more positive feedback
thanks!

[lilreed2136]

Bkp95 there are no new updates. Hasn’t been in over a year.

[Terry @ BMS]

Any updates from Terry/Burger on the recent issues posted here? Have they been able to test other 3.5t vehicles in the past few months?
I'm hesitant to pull the trigger on the jb4 until I hear some more positive feedback
thanks!

We've been shipping 15-20 of these systems per month for the last year or so. Overall works well. Every now and again we get a car where they have to leave the front MAP connection factory but its not been a high percentage.

[lilreed2136]

We've been shipping 15-20 of these systems per month for the last year or so. Overall works well. Every now and again we get a car where they have to leave the front MAP connection factory but it’s not been a high percentage.

Leaving the front map connection stock in my case the car makes the same amount of boost on map 0. Maxes at 15 psi. Do you know what the factory boost level is? It makes the same amount of boost on Map 0 and Map 2 setup that way

[Bkp95]

I haven't taken the time to research the posters here with the "problems"...do we think it is isolated to a year of manufacture? I have a '23 gv70.
My initial thought that it is the newer vehicles with issues. Lilreed, Derrick, gv80man...what year are you gv's?

[lilreed2136]

I haven't taken the time to research the posters here with the "problems"...do we think it is isolated to a year of manufacture? I have a '23 gv70.
My initial thought that it is the newer vehicles with issues. Lilreed, Derrick, gv80man...what year are you gv's?

Definitely not isolated i have a 22 but talked to 10+ owners on the GV70 Facebook page all have the same issues as me some have the 23. The 2.5 doesn’t have any issues but the 3.5 cuts boost if you floor it on map 1 and map 2. Disconnecting one of the map sensors will eliminate the problem but it seems to feel the same as stock when you do it that way. Map 0 my car maxes at 15 psi and Map 2 with the sensor unhooked maxes at 15 also