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Technical Topics B48 4-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications JB4 on G20 330i?

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      02-26-2020, 07:37 PM   #1
hamzag20
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Has anyone put a JB4 on a 330i yet? If so, how much can you feel the gains and is it worth it? How tough is the installation process? I am mostly looking to install a JB4 over BM3 bc my car is a lease and I've already heard a few nightmares w BM3 on G20s. Also, how safe would it be to install a JB4? Would I need to remove it before every dealer visit or would I be fine? Anything helps! (Also debating whether I should just get racechip)
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      02-26-2020, 08:35 PM   #2
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JB4 can be installed on the 330i though I can’t seem to find anyone who has it on the g20 330i.
Install doesn’t look too bad. The toughest part will probably be routing of the cable but it can be done comparatively easily. If you don’t want to poke through the firewall, you can do an easy install and route it through the door jamb into the hood. I checked it out last week and saw that that could be done too.
Obviously you’ll need the cable or Bluetooth too since, if you don’t get those, it will be set to map 1 which is only minutely better than a JB+. For the other maps, you’ll need a computer or your phone.

I’m holding back since a JB4 plus Bluetooth comes to around $670 which is a little much for me. Ofcourse I can send the JB+ back to them and they’ll take $200 off but I’ll wait for a few months to see if any new g20s are flashed with BM3. I’d love to get a tune but yeah.
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      02-26-2020, 08:47 PM   #3
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JB4 on G20 330i?

Oh damn 670 plus Bluetooth? With the wired connection it'll be around 565. Do I need the wired connection in order to switch maps or is the wired connection just for logging? I don't understand why I'd pay 140 more for Bluetooth if I can just pay 35 for wired. I'm super confused lol. What does the wire even connect to and where can I see the logs if I do buy the wired connection? Also I know that you've owned a race chip. You think i should just go for a race chip? The only thing that is deterring me from a race chip is that it's only for my 330i and when I upgrade to the m340 late next year, I can't transfer my racechip to the m340 while I can just switch my JB4 to my m340 which is pretty nice.
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      02-26-2020, 09:21 PM   #4
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Originally Posted by hamzag20 View Post
Oh damn 670 plus Bluetooth? With the wired connection it'll be around 565. Do I need the wired connection in order to switch maps or is the wired connection just for logging? I don't understand why I'd pay 140 more for Bluetooth if I can just pay 35 for wired. I'm super confused lol. What does the wire even connect to and where can I see the logs if I do buy the wired connection? Also I know that you've owned a race chip. You think i should just go for a race chip? The only thing that is deterring me from a race chip is that it's only for my 330i and when I upgrade to the m340 late next year, I can't transfer my racechip to the m340 while I can just switch my JB4 to my m340 which is pretty nice.
No no. It’s 670 including Bluetooth since the bluetooth cable is $140. The wired cable is more than enough if you have a laptop. Problem is I only have an Apple laptop and idk if it’ll work with that. Bluetooth is so you can change maps and log using your phone. The cable can be used to change maps and log too but I’m not sure if it’s a windows only thing or it works with MacBooks as well.
I was happy with the racechip in my A4. But I’m also happy with the JB+ on the 330i. I had the RC ultimate connect and they said I can use it with another car if I pay them for a new harness for the new car and they’ll also send maps for the new car. But I sold it to another person with a B9 A4 and got JB+ instead. I went with JB+ since bms mainly works on BMWs and they have good experience with the b48/58 engines.
Regarding where the wire is connected. There’s a pdf on their website which shows where to connect the wire. There’s even a YouTube video by Terry I believe showing the process.
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      02-26-2020, 09:41 PM   #5
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Originally Posted by hamzag20 View Post
Oh damn 670 plus Bluetooth? With the wired connection it'll be around 565. Do I need the wired connection in order to switch maps or is the wired connection just for logging? I don't understand why I'd pay 140 more for Bluetooth if I can just pay 35 for wired. I'm super confused lol. What does the wire even connect to and where can I see the logs if I do buy the wired connection? Also I know that you've owned a race chip. You think i should just go for a race chip? The only thing that is deterring me from a race chip is that it's only for my 330i and when I upgrade to the m340 late next year, I can't transfer my racechip to the m340 while I can just switch my JB4 to my m340 which is pretty nice.
No no. It’s 670 including Bluetooth since the bluetooth cable is $140. The wired cable is more than enough if you have a laptop. Problem is I only have an Apple laptop and idk if it’ll work with that. Bluetooth is so you can change maps and log using your phone. The cable can be used to change maps and log too but I’m not sure if it’s a windows only thing or it works with MacBooks as well.
I was happy with the racechip in my A4. But I’m also happy with the JB+ on the 330i. I had the RC ultimate connect and they said I can use it with another car if I pay them for a new harness for the new car and they’ll also send maps for the new car. But I sold it to another person with a B9 A4 and got JB+ instead. I went with JB+ since bms mainly works on BMWs and they have good experience with the b48/58 engines.
Regarding where the wire is connected. There’s a pdf on their website which shows where to connect the wire. There’s even a YouTube video by Terry I believe showing the process.
Yup, I just watched the video and I don't think I wanna put all the zip tie and cutting stuff into installing a JB4 if there's BM3 available. I'm just scared that I'm on a lease and that might not be the smartest option especially considering the fact that my car is in for software updates because of recalls. JB+ might just be my best bet I guess. Do you feel the diff w ur JB+. Also, with the dial turned up to 100% from its previous position did u feel a diff l. I just believe that the JB+ isn't the safest option but whatever hopefully it'll be fine.
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      02-26-2020, 09:50 PM   #6
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Quote:
Originally Posted by hamzag20 View Post
Yup, I just watched the video and I don't think I wanna put all the zip tie and cutting stuff into installing a JB4 if there's BM3 available. I'm just scared that I'm on a lease and that might not be the smartest option especially considering the fact that my car is in for software updates because of recalls. JB+ might just be my best bet I guess. Do you feel the diff w ur JB+. Also, with the dial turned up to 100% from its previous position did u feel a diff l. I just believe that the JB+ isn't the safest option but whatever hopefully it'll be fine.
There’s no need to cut into the stock harness of the car even with a JB4.
And yes. There’s definitely a difference. JB+ kinda feels like map 1 of the jb4 (not my words. Words of someone else who did a JB4 upgrade from JB+ on their f30 330i). And JB+ isn’t unsafe per se. Lots of cars running JB+ without any issues. But I’ve read about lots of cars being tuned and having issues. So yes.
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      02-26-2020, 09:59 PM   #7
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Quote:
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Quote:
Originally Posted by hamzag20 View Post
Yup, I just watched the video and I don't think I wanna put all the zip tie and cutting stuff into installing a JB4 if there's BM3 available. I'm just scared that I'm on a lease and that might not be the smartest option especially considering the fact that my car is in for software updates because of recalls. JB+ might just be my best bet I guess. Do you feel the diff w ur JB+. Also, with the dial turned up to 100% from its previous position did u feel a diff l. I just believe that the JB+ isn't the safest option but whatever hopefully it'll be fine.
There’s no need to cut into the stock harness of the car even with a JB4.
And yes. There’s definitely a difference. JB+ kinda feels like map 1 of the jb4 (not my words. Words of someone else who did a JB4 upgrade from JB+ on their f30 330i). And JB+ isn’t unsafe per se. Lots of cars running JB+ without any issues. But I’ve read about lots of cars being tuned and having issues. So yes.
I'm gonna cross my fingers go with the JB+ and probs leave it at 75%. The JB4 looks like a pain to uninstall and install for dealership visits. I REALLY wanted to Bootmod3 but that obviously isn't a great idea with a lease. Bootmod3 will be the first mod on my M340 that I plan to finance late next year.
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      02-26-2020, 10:10 PM   #8
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Quote:
Originally Posted by hamzag20 View Post
I'm gonna cross my fingers go with the JB+ and probs leave it at 75%. The JB4 looks like a pain to uninstall and install for dealership visits. I REALLY wanted to Bootmod3 but that obviously isn't a great idea with a lease. Bootmod3 will be the first mod on my M340 that I plan to finance late next year.
Bump it up to 100pc. You’ll be fine
And the Jb4 won’t be that much of a hassle if you install it the easy way. Probably five minutes to take it off and put it back on compared to 30s with the JB+.
BM3 doesn’t have a map for the M340i yet. They might have one soon enough.
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      02-26-2020, 10:58 PM   #9
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Quote:
Originally Posted by VipinLJ View Post
Quote:
Originally Posted by hamzag20 View Post
I'm gonna cross my fingers go with the JB+ and probs leave it at 75%. The JB4 looks like a pain to uninstall and install for dealership visits. I REALLY wanted to Bootmod3 but that obviously isn't a great idea with a lease. Bootmod3 will be the first mod on my M340 that I plan to finance late next year.
Bump it up to 100pc. You’ll be fine
And the Jb4 won’t be that much of a hassle if you install it the easy way. Probably five minutes to take it off and put it back on compared to 30s with the JB+.
BM3 doesn’t have a map for the M340i yet. They might have one soon enough.
Yup yup they def will by next year
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      03-05-2020, 04:34 PM   #10
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I just got mine, it's worth it. Do it.
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      03-06-2020, 12:11 AM   #11
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I just got mine, it's worth it. Do it.
How bad was the install? Did you bring the obd cable in through the firewall?
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      06-17-2020, 11:23 AM   #12
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My G20 330i already install JB4 with latest firmware, BMC drop in filter, FTP intake n charge piping, Catless downpipe full 3inch exhaust
Ron100 petrol
Map 4 absolute 20psi 290plus whp
Map 5 absolute 22psi already 300whp (feel very scary with stock Internal Engine)
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      06-17-2020, 05:27 PM   #13
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My G20 330i already install JB4 with latest firmware, BMC drop in filter, FTP intake n charge piping, Catless downpipe full 3inch exhaust
Ron100 petrol
Map 4 absolute 20psi 290plus whp
Map 5 absolute 22psi already 300whp (feel very scary with stock Internal Engine)
Did you dyno your car?
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      11-02-2020, 09:50 PM   #14
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What do you guys recommend tune wise for best increase in horsepower and torque?
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      11-05-2020, 09:33 AM   #15
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Hi all

My car was built in July 2020 and I have been informed that the ECU is totally locked - would a JB4 work?
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      11-14-2020, 10:09 PM   #16
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Hi all

My car was built in July 2020 and I have been informed that the ECU is totally locked - would a JB4 work?
JB4 would work yes, it works by intercepting the boost signals from the sensor to the ECU, the ECU will "crank up the boost" (keep the wastegate closed for longer) in response. It doesn't matter what version ECU/DME software you have
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