To all my overboost boi's

[JP28]

If this is in the wrong place I'm sorry. If you have any other info or can correct me please do. I'm just reporting. Hopefully everyone from the 40 threads on overboost find this.

Quick back story. I can constantly hit "limp mode" with wide open throttle starting in first. Boost dumps when she sees third gear coming. Other times in the middle of 3rd and 4th there's hesitation. If you have intakes you'll hear them make noise before the shift.

Took mine in yeaterday for the fuel pump recall. Their computer didn't show a recall. I saw the blank computer screen with my own eyes. I'll attach the pics as to why I thought i had one and maybe found my problem. I guess mine was built after July 22nd. They checked everything and this time got a guy who's in the know. No leaks no nothing. Car is perfect. He said the supras are having the same issues. So if you're stock or a 22 idk wtf is going on and other then having them check everything and confirm zero issues they have nothing to offer you. Apparently the injen/mbrp is just too efficient. Off the record he told me what I already figured: jb4/ewg wires if you're worried about warranty, ecu if you feel justified spending the money.

Just make sure you're not getting traction/stability control issues. There's a difference and maybe you get lucky and are able to do intake/exhaust without issue like we all originally thought. Should be well known but just to beat a dead horse if you're touching down pipes or cats, touch a jb4 first.

Also having them clear the code does nothing. Most times it'll shut your boost off without throwing the p0234. I got lucky the first time and mine was stored so they had to acknowledge my problem existed. They cleared it and I got my boost to shut off before I even left the parking lot. No code.

IF YOURE GOING TO MOD THE CAR DO TUNE/PIGGYBACK FIRST. Otherwise you're gonna be annoyed lol I guess I don't get why this isn't an easy fix. Can kia not just give dealers an upgrade so our ecus arent so pussified? Bc if I just bought a 2022 and was stock with no desire to mod and had this problem then was told I have to void the warranty to fix something they can't, I'd be extremely irritated.

Like this post if you've had work done on your back drivers side window lol cmon kia help us help you. I love this car.

 

[General_Vodka]

So your saying they couldn't find the problem? Did you have them check everything that's mentioned in the forum, like blow off valves? Does your issue happen in sport mode with traction and stability off?

 

[JP28]

So your saying they couldn't find the problem? Did you have them check everything that's mentioned in the forum, like blow off valves? Does your issue happen in sport mode with traction and stability off?

Yes to all that. I've tried just one off and both off. If I do actual launch control is the only time it won't. It does the popping noise from 1st to 2nd now too.

With just intakes I blew plugs. But they were going bad before that bc my radio was cutting out. Then after the mbrp is when the overboost started. For some reason the stock ecu can't adapt I'm assuming. I'm out of ideas. I planned on a jb4 anyway but until we figure this out it's gonna bug the shit out of me.

 

[General_Vodka]

Yes to all that. I've tried just one off and both off. If I do actual launch control is the only time it won't. It does the popping noise from 1st to 2nd now too.

With just intakes I blew plugs. But they were going bad before that bc my radio was cutting out. Then after the mbrp is when the overboost started. For some reason the stock ecu can't adapt I'm assuming. I'm out of ideas. I planned on a jb4 anyway but until we figure this out it's gonna bug the shit out of me.

What was wrong with your plugs? Stock plugs sucked on the early models but I thought they figured out the issues with the new models. I recommend HKS plugs.

 

[JP28]

I guess not bc mine went bad at like 12k miles lol but yeah I'll be swapping with hks when I get the jb4.

And to contradict what I said yesterday, omw home from work last night I couldn't get it to go into limp mode with trac/stab off. Pulled like a bat out of hell. Go figure. The only difference between last night and Monday was 70⁰ instead of 50⁰. I'm gonna keep driving around with them off and see what happens.

 

[General_Vodka]

I guess not bc mine went bad at like 12k miles lol but yeah I'll be swapping with hks when I get the jb4.

And to contradict what I said yesterday, omw home from work last night I couldn't get it to go into limp mode with trac/stab off. Pulled like a bat out of hell. Go figure. The only difference between last night and Monday was 70⁰ instead of 50⁰. I'm gonna keep driving around with them off and see what happens.

So it could be something traction control related? Well I'm glad you got to enjoy the car at least lol. Just a reminder that you don't have auto emergency collision braking with traction/stability off. But you probably know that already.

 

[JP28]

So it could be something traction control related? Well I'm glad you got to enjoy the car at least lol. Just a reminder that you don't have auto emergency collision braking with traction/stability off. But you probably know that already.

I turned all the driver aids off a long time ago lol except blind spot and rear cross traffic. And idk it would make sense, at least in my head, that if the ecu isn't limiting launch control then it wouldn't limit the car in general if the launch parameters were met. I'm gonna experiment leaving from 1 and D tonight on my way home. I can't remember which I was in when I got it to limp on Monday

 

[GTElite22]

If this is in the wrong place I'm sorry. If you have any other info or can correct me please do. I'm just reporting. Hopefully everyone from the 40 threads on overboost find this.

Quick back story. I can constantly hit "limp mode" with wide open throttle starting in first. Boost dumps when she sees third gear coming. Other times in the middle of 3rd and 4th there's hesitation. If you have intakes you'll hear them make noise before the shift.

Took mine in yeaterday for the fuel pump recall. Their computer didn't show a recall. I saw the blank computer screen with my own eyes. I'll attach the pics as to why I thought i had one and maybe found my problem. I guess mine was built after July 22nd. They checked everything and this time got a guy who's in the know. No leaks no nothing. Car is perfect. He said the supras are having the same issues. So if you're stock or a 22 idk wtf is going on and other then having them check everything and confirm zero issues they have nothing to offer you. Apparently the injen/mbrp is just too efficient. Off the record he told me what I already figured: jb4/ewg wires if you're worried about warranty, ecu if you feel justified spending the money.

Just make sure you're not getting traction/stability control issues. There's a difference and maybe you get lucky and are able to do intake/exhaust without issue like we all originally thought. Should be well known but just to beat a dead horse if you're touching down pipes or cats, touch a jb4 first.

Also having them clear the code does nothing. Most times it'll shut your boost off without throwing the p0234. I got lucky the first time and mine was stored so they had to acknowledge my problem existed. They cleared it and I got my boost to shut off before I even left the parking lot. No code.

IF YOURE GOING TO MOD THE CAR DO TUNE/PIGGYBACK FIRST. Otherwise you're gonna be annoyed lol I guess I don't get why this isn't an easy fix. Can kia not just give dealers an upgrade so our ecus arent so pussified? Bc if I just bought a 2022 and was stock with no desire to mod and had this problem then was told I have to void the warranty to fix something they can't, I'd be extremely irritated.

Like this post if you've had work done on your back drivers side window lol cmon kia help us help you. I love this car.

Dude I have exact same issue!! And mods! I'm left to void my warranty and tune it kia said they can't do anything about it and have acknowledged the issue but can no longer help. Crazy eh? I'm in Canada 2022 stinger gt elite. Dm me buddy

 

[SirCozak]

Dude I have exact same issue!! And mods! I'm left to void my warranty and tune it kia said they can't do anything about it and have acknowledged the issue but can no longer help. Crazy eh? I'm in Canada 2022 stinger gt elite. Dm me buddy

If you have a JB4 then you can fix it with ewg wires. Also the JB4 BEF via Sxth will also eliminate it whilst adding more power, so it's win win.

 

[dcatx]

This was happening to me, added JB4 and ewg connectors and it’s still happening. 2020 GT

 

[SirCozak]

This was happening to me, added JB4 and ewg connectors and it’s still happening. 2020 GT

Adding the wires alone is not enough, you need to adjust the FF setting. Reduce it down to 40 and see what happens. If all good you can start to bump it back up 2 points or so at a time until you find the point where it will overboost, then reduce to just under it.

 

[Maaly]

Adding the wires alone is not enough, you need to adjust the FF setting. Reduce it down to 40 and see what happens. If all good you can start to bump it back up 2 points or so at a time until you find the point where it will overboost, then reduce to just under it.

I have the 2023 gt2. Performance mods are ngt 200 cell primaries, ark catless mids, mbrp valvetronic catback with mbrp resonators, injen intakes, IMR intercooler and piping, JB4 with EWG wires and BEF. I got the BEF to hopefully kill the overboost but it seems as if nothing is working. I’ve lowered the FF down to 15 from 50 and still nothing working. I haven’t tried 40 yet. I tried 45 tho. I’ll try 40 as your statement suggested. If that doesn’t work I’ll ask sxth how to reset the waste gate value. If that doesn’t work I guess it’s either LAP3 ecu or get an Audi RS5

 

[Thomby]

Performance mods are ngt 200 cell primaries, ark catless mids, mbrp valvetronic catback with mbrp resonators, injen intakes, IMR intercooler and piping, JB4 with EWG wires and BEF. I got the BEF to hopefully kill the overboost but it seems as if nothing is working. I’ve lowered the FF down to 15 from 50 and still nothing working. I haven’t tried 40 yet. I tried 45 tho

Were all the upgrades done at once? Seems like some cars are more sensitive to overboost while others aren't at all. Your breathing mods may make the turbos respond faster than the car is used to so you overshoot, which the EWGs help address by scaling up wastegate activity.

Depending on whether you had issues before/after tuning or breathing mods, you may want to scale everything back and then increment your way up. So dial back to Map 0 and use stock EWG settings (DWP to 0, no rpm-level WGDC, FF to 50). If it overboosts dial FF back 5 at a time, and once it's stable go up a map.

 

[Plakchup]

Finally after dealing with overboost for 2 years, I got jb4 done with hks plugs, fuel + ewg wires. Once I lowered the wastegate adaptations to 40 from 50 I had no more overboost. Did ton of WOT on freeway no problems. Pulls hard no issues. It did go into limp mode at ff 50 initially on map 4.

Went to map 3 and ff 40 and I am as happy as I can ever be. I added the fuel it kit as well as the bms intercooler + snorkles. That helped the temps a lot and logs look much better than before. Also map 3/4 you need a proper e30 mix or the car won't be happy when you gun it. Now the power delivery is smooth, hard and consistent on any map.

Took some dialing it in for a while to get it right but oh man I am so happy with how the car runs now with the jb4 once I found that sweet spot for that wastegate adaptations ff setting. Being able to now go WOT with my mods puts a smile on my face again. It's the main reason I got jb4 with ewg wires. Learned quiet a lot also working with the bms folks and they were very helpful too. My favorite two mods I've done are definitely the bms intercooler and the snorkles. The difference in intake temps is very noticable.

My stinger is a 2023 gt2 awd with k&n intakes, ark dp, gfb 9012 bov, mbrp pro active, hks plugs gapped to 0.022, bms fmic, and snorkles. Also have the eibach sway + springs with megan racing camber arms. Probably my next mod is the ek1 with tcu flash.

 

[Maaly]

Finally after dealing with overboost for 2 years, I got jb4 done with hks plugs, fuel + ewg wires. Once I lowered the wastegate adaptations to 40 from 50 I had no more overboost. Did ton of WOT on freeway no problems. Pulls hard no issues. It did go into limp mode at ff 50 initially on map 4.

Went to map 3 and ff 40 and I am as happy as I can ever be. I added the fuel it kit as well as the bms intercooler + snorkles. That helped the temps a lot and logs look much better than before. Also map 3/4 you need a proper e30 mix or the car won't be happy when you gun it. Now the power delivery is smooth, hard and consistent on any map.

Took some dialing it in for a while to get it right but oh man I am so happy with how the car runs now with the jb4 once I found that sweet spot for that wastegate adaptations ff setting. Being able to now go WOT with my mods puts a smile on my face again. It's the main reason I got jb4 with ewg wires. Learned quiet a lot also working with the bms folks and they were very helpful too. My favorite two mods I've done are definitely the bms intercooler and the snorkles. The difference in intake temps is very noticable.

My stinger is a 2023 gt2 awd with k&n intakes, ark dp, gfb 9012 bov, mbrp pro active, hks plugs gapped to 0.022, bms fmic, and snorkles. Also have the eibach sway + springs with megan racing camber arms. Probably my next mod is the ek1 with tcu flash.

Finally after dealing with overboost for 2 years, I got jb4 done with hks plugs, fuel + ewg wires. Once I lowered the wastegate adaptations to 40 from 50 I had no more overboost. Did ton of WOT on freeway no problems. Pulls hard no issues. It did go into limp mode at ff 50 initially on map 4.

Went to map 3 and ff 40 and I am as happy as I can ever be. I added the fuel it kit as well as the bms intercooler + snorkles. That helped the temps a lot and logs look much better than before. Also map 3/4 you need a proper e30 mix or the car won't be happy when you gun it. Now the power delivery is smooth, hard and consistent on any map.

Took some dialing it in for a while to get it right but oh man I am so happy with how the car runs now with the jb4 once I found that sweet spot for that wastegate adaptations ff setting. Being able to now go WOT with my mods puts a smile on my face again. It's the main reason I got jb4 with ewg wires. Learned quiet a lot also working with the bms folks and they were very helpful too. My favorite two mods I've done are definitely the bms intercooler and the snorkles. The difference in intake temps is very noticable.

My stinger is a 2023 gt2 awd with k&n intakes, ark dp, gfb 9012 bov, mbrp pro active, hks plugs gapped to 0.022, bms fmic, and snorkles. Also have the eibach sway + springs with megan racing camber arms. Probably my next mod is the ek1 with tcu flash.

I also have the 2023 gt2 awd. Terry was very helpful but no matter what we tried it didn’t work. I even bought the BEF and still no luck. So I had to sell the whole set up. I’m going with LAP3 stage 1.5 and I’m getting their WMI kit. I should be golden from there

 

[Plakchup]

That's a bummer.

I guess every car is different. Hopefully works out better for you. At least the good thing is that we have options. I know also the 2022+ tend to overboost easier as soon as you throw any intake/exhaust on there.

From my limited understanding, its just the stock tune with the combination of the wastegates keeping shut under WOT that cause the turbos to spool up much faster and overboost since the ecu sees higher psi than what it's ok with. Also the 2022+ have slightly different turbos so not sure if that plays into that too. Takes some testing to see which settings work best.

 

[Thomby]

I know also the 2022+ tend to overboost easier as soon as you throw any intake/exhaust on there.

I've seen this mentioned a couple of places but don't think it's by any means universal. I got my 2022 with ~13k miles on it, and while I didn't spent a ton of time stock, had no overboost issues unmodified. I then did intake & tune (and plugs) at the same time, and worked my way up through Maps 1 & 2 on premium, then 3-4-5 on E30, and have never experienced overboost.

Alao the 2022+ have slightly different turbos so not sure if that plays into that too.

That's news to me...I thought every year used the same Garrett MGT1446SZLK turbo (custom application but MGT1446 / updated GT14 model).

 

[Plakchup]

Yeah I could be wrong but that's what I've heard from others. I didn't have overboost issues stock either. I added the k&n intakes and still was ok. Once I added the ark mid pipes with the borla/mbrp active catback that's when it started. Supposedly from what I heard even completely stock stingers can overboost.

Dealer of course won't do a damn thing about it so you basically need a tune.

 

[bfglitch]

I can attest that, yes, 2022+ completely stock can overboost. For me when I was 100% stock I would start getting overboost when the temps dropped into the 40's. I've adapted my driving habits during the winter to avoid it simply by not going WOT from a dead stop. Honestly doing about 1/2 to 3/4 from a dead stop and I have no issues and really on the road I don't really need more than that anyway. But it would be nice to get the issue resolved once and for all as I know KIA won't do a damn thing about it.

 

[Plakchup]

Ah yes that's not too surprising. I guess since its getting colder more dense air the turbos can spool up faster since they are small and the wastegate just keeps shut during wot causing overboost followed with limp mode. Ecu sees boost spike and limp mode is engaged. If the wastegate would've controlled the pressure better in stock form then we most likely wouldn't have overboost isssues or at least much less. That's how its controlled with the ewg wires where it helps control that pressure so it's not too much when it's all shut closed during wot.

I was experiementing a bit with the ewg controls last night did a few pulls on wastegate adaptations 40 and 45. Even stronger pull at 45 setting zero overboost in colder 50 degrees weather.

Funny thing actually I learned that chatgbt can read jb4 logs and analyze it pretty nicely. Also can give you recommendations based on logs and fuel. Going to try chevron gas instead of shell which seems to show my fuel trims being a bit high. Chatgbt said some stinger owners reported better logs with chevron gas so its worth giving it a go. It also told me based on wastegate duty cycle that I still have room for the turbos to work better with a slightly higher wastegate ff setting from 45-48 from my previous 40 setting. Pretty cool!