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Tuning JB4 Installation

R Veloster N

Well-Known Member
Mar 5, 2019
5,380
4,076
113
Rocky Mountains, US
The Veloster N uses a electronic wastegate with no solenoid, so I am not sure what solenoid you replaced.
The VN has an Electrically Operated Wast Gate Actuator and an Internal wastegate. raydogg123189 also owns an 1.6T Elantra N-Line Gamma. So, there a bit of a difference in the control and wastegate operation. Please, take the time to read his entire commentary. It will help you better determination, as to what he's referring too specifically. :)

@Mikemr305 & @Rem234; I don't see a problem here either way. He sports a JB4 and his comments are responsive to the JB4, as per his last post.
After a few test runs I hit 28psi so I threw jb4 overboost protection back on and itl hit roughly 24 on a hard pull now.
:) Appreciate the comments @raydogg123189 and information.
 
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Mikemr305

Well-Known Member
Dec 24, 2019
556
525
93
Miami
Do i just the put the wire harness ( the long wire) to the red part and that it? Cause i dont think i properly did that and now i have a check engine light and the code is 0030
I think they expect you to solder the wire to the metal part and then plug it in?
I just folded the wire contacts over the metal part and sandwiched it when i plugged it in. I have no idea if its working or not either
 

Feloster_Vlow

New Member
Dec 3, 2019
4
0
1
Illinois
I think they expect you to solder the wire to the metal part and then plug it in?
I just folded the wire contacts over the metal part and sandwiched it when i plugged it in. I have no idea if its working or not either
Cause I just installed my jb4 and im getting a check engine light and the code was 0030, ive upgraded my spark plugs but I'm thinking i might of not installed it correctly and it might be the o2 sensor i bought. cause i just slid the black wire into the red part of the sensor
 

raydogg123189

Member
Apr 23, 2020
57
25
18
florida, usa
hey guys my gt nline is pulling like a freight train after i did some minor mods
i have the jb4 on map 2 on 91 and 4 on 93

i upgraded the bcs (wastegate solenoid), kit included upgraded hose size and turbo inlet connector, i didn't install the inlet though because i was kinda lazy that day lol

upgraded the bov solenoid to a mac
upgraded the tubing for the mac to 5/32 and replaced the clamps with appropriate spring clamps

further modified my k&n cai kit, it now has the oem resonator, and i heat wrapped the pipe with fiberglass heat wrap that's normally used on exhaust and then wrapped it with reflective insulation tape (this reduced the iat by 20-30 degrees) it maxes at 116f now

i upgraded to hks m45xl spark plugs when i did the jb4 install

and i have the fuel wire hooked up (i bought their adapter for quick removal, and soldered the fuel wire to that instead of the positap method)

i'm getting between 16 and 26psi and that's the max i have the jb4 set for
i have 1st gear under-boosted by 5psi, 2nd 3psi and 3rd by 1psi

my next mods will be a cat back and the downpipe with high flow cat and then intercooler cold pipe with bov upgrade
 
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raydogg123189

Member
Apr 23, 2020
57
25
18
florida, usa
hey guys
I got my afe takada axle back exaust (with muffler) installed at an exhaust shop 2 weeks ago. i mentioned the muffler because afe makes it with and without.
I also installed my gfb hybrid bov this week. I wanted to get 1 that was adjustable but btr only had the fixed 50/50 1 in stock.

so far I'm happy with the results. I've been running jb4 on map 2 and the car feels so much livelier with this 2 new mods\


the last and final mod on my checklist will be done on my next trip home to Florida in the spring because my favorite dealer is down there(they don't care about any mods, as long as it is not an internal engine mod)

the last mod will be the downpipe with high flow cat
 
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raydogg123189

Member
Apr 23, 2020
57
25
18
florida, usa
have you guys, that have done bovs on your own car.. noticed your turbo spool faster than with the stock recirc valve?
i mean even you guys with the vn lol.. just looking for some feedback because i feel like my nline is spooling faster now
 

GruNderson

New Member
Sep 20, 2020
3
0
1
Ohio
Super dumb question. for the MAP and TMAP sensors does it matter which plug you plug into each one? for example one plug has brown wires and the other has multi colors. There is a video on YouTube in which the plugs are opposite to yours in the pictures. also my JB4 did not come with a Fuel adapter so do i NEED that or can i run the MAP and TMAP alone? sorry if these are basic questions im new to tuning and don't wanna blow my engine up or fry the the computer. Any help would be greatly appreciated!
 

Jigbits

Member
Feb 18, 2019
71
77
18
Florida
Super dumb question. for the MAP and TMAP sensors does it matter which plug you plug into each one? for example one plug has brown wires and the other has multi colors. There is a video on YouTube in which the plugs are opposite to yours in the pictures. also my JB4 did not come with a Fuel adapter so do i NEED that or can i run the MAP and TMAP alone? sorry if these are basic questions im new to tuning and don't wanna blow my engine up or fry the the computer. Any help would be greatly appreciated!
Rainbow wires go on the charge pipe and brown wires on the manifold. That's what Burger said to do. I'm not sure if it makes a difference I've never had them any other way.


No you do not need the fuel wire. It'll work fine without it but you won't be able to adjust AFR which isn't totally necessary and from my experience insanely inconsistent anyway.