[Martin.328]

Hey guys new to the forums here and just wanted to give my thoughts on the jb4. I have a 16 328 that i inherited from my wife. I ordered intake, catless dp and ic pipes with the jb4. So far I have only gotten the jb4 and installed it couple days ago.

At first I was really impressed with both map 1 and 2. Very noticeable difference, car feels very strong all the way through redline. But then i started noticing inconsistencies in performance and little hiccups sometimes between 3-6k rpms. I gotta say its not confidence inspiring. I cant tell without logs but it feels like it might be pulling timing, might even be running too lean. So ill probably be returning it and going with one of the other options.

[BMWtight2me]

Originally Posted by Martin.328

Hey guys new to the forums here and just wanted to give my thoughts on the jb4. I have a 16 328 that i inherited from my wife. I ordered intake, catless dp and ic pipes with the jb4. So far I have only gotten the jb4 and installed it couple days ago.

At first I was really impressed with both map 1 and 2. Very noticeable difference, car feels very strong all the way through redline. But then i started noticing inconsistencies in performance and little hiccups sometimes between 3-6k rpms. I gotta say its not confidence inspiring. I cant tell without logs but it feels like it might be pulling timing, might even be running too lean. So ill probably be returning it and going with one of the other options.

You need the downpipe and intercooler. Temp goes up, timing drops. You need the supporting bolt ons or the jb4 will miss it's mark. Also be sure to datalog and make sure those hiccups are the ignition dropping and not a misfire from one of the cylinders. Most likely your car is getting heatstroke after ripping on the gas a few times.

[Martin.328]

Originally Posted by BMWtight2me

You need the downpipe and intercooler. Temp goes up, timing drops. You need the supporting bolt ons or the jb4 will miss it's mark. Also be sure to datalog and make sure those hiccups are the ignition dropping and not a misfire from one of the cylinders. Most likely your car is getting heatstroke after ripping on the gas a few times.

Yea i totally get it, but its way to inconsistent for my liking. I understand the heatsoak but still even sometimes from gear to gear I feel the hesitations and then itll be gone next time I get on it. Im still researching tuning solutions but im leaning towards bm3.

[BMWtight2me]

Originally Posted by Martin.328

Yea i totally get it, but its way to inconsistent for my liking. I understand the heatsoak but still even sometimes from gear to gear I feel the hesitations and then itll be gone next time I get on it. Im still researching tuning solutions but im leaning towards bm3.

The thing about maps 1 and 2 is they're laying down high fixed boost. So as soon as you gas it, your slamming 20+ psi through the turbo, and you don't have a catless downpipe to allow for the new high pressure flow and your temps are also out of hand without the larger intercooler in the loop.

I actually run map 5 which is an adaptive map. My car runs smooth and surges the same way in each gear.

Definitely datalog so you can properly asses your setup amd see if it's even functioning properly. Test with 91, 93, and 100 octane if possible.

Also make sure to calibrate the jb4. It behaves differently depending on conditions such as whether and supporting parts. So the way to calibrate it is to put it in 3rd gear and fully depress the pedal from about 2500 rpms all the way to redline. Do this at least three times and the car should pull much smoother.

The jb4 can actually take a little while to settle in.

Make sure to put in the proper downpipe too (go catless), it's necessary to properly run stage 2 jb4. I wouldn't do maps 1 or 2 without one.

[MONSTAR]

Originally Posted by BMWtight2me

The thing about maps 1 and 2 is they're laying down high fixed boost. So as soon as you gas it, your slamming 20+ psi through the turbo, and you don't have a catless downpipe to allow for the new high pressure flow and your temps are also out of hand without the larger intercooler in the loop.

I actually run map 5 which is an adaptive map. My car runs smooth and surges the same way in each gear.

Definitely datalog so you can properly asses your setup amd see if it's even functioning properly. Test with 91, 93, and 100 octane if possible.

Also make sure to calibrate the jb4. It behaves differently depending on conditions such as whether and supporting parts. So the way to calibrate it is to put it in 3rd gear and fully depress the pedal from about 2500 rpms all the way to redline. Do this at least three times and the car should pull much smoother.

The jb4 can actually take a little while to settle in.

Make sure to put in the proper downpipe too (go catless), it's necessary to properly run stage 2 jb4. I wouldn't do maps 1 or 2 without one.

Map 1 is totally fine for a 328 without a catless downpipe and I believe is actually the recommended map for 328's (428s, 528s) without any other mods. Map 2 is recommended for those with access to 93 octane and using a catless downpipe.

[BMWtight2me]

Originally Posted by MONSTAR

Map 1 is totally fine for a 328 without a catless downpipe and I believe is actually the recommended map for 328's (428s, 528s) without any other mods. Map 2 is recommended for those with access to 93 octane and using a catless downpipe.

OP -- you should datalog 3rd gear pulls in map 1 and post them along with weather temp and octane.

[Martin.328]

Originally Posted by BMWtight2me

OP -- you should datalog 3rd gear pulls in map 1 and post them along with weather temp and octane.

I know when i get a chance I will datalog. I just went to map1 and it feels much slower but still has that hesitation. Im just going to return it while im still in my return window.

[MONSTAR]

Map 0: JB4 disabled
Map 1: Additive target, around 4psi over stock.
Map 2: Additive target, around 6psi over stock. Suggested for those with 93 octane and bolt on modifications. Also good for small E85 mixtures.
Map 3: Progressive WMI mapping.
Map 4: Stock performance with JB4 active for logging only.
Map 5: Autotuning map, absolute target of 11-17psi based on octane and conditions.
Map 6: User definable absolute target map. Suggested for troubleshooting by professionals only.
Map 7: Race gas map. Absolute target of 18.5psi. Requires straight unleaded race gas.

[Mike@N54Tuning.com]

Originally Posted by BMWtight2me

OP -- you should datalog 3rd gear pulls in map 1 and post them along with weather temp and octane.

+1

Mike

[Mike@N54Tuning.com]

Originally Posted by Martin.328

I know when i get a chance I will datalog. I just went to map1 and it feels much slower but still has that hesitation. Im just going to return it while im still in my return window.

What gas are you using?

Mike

[drivef30]

Is map 2 or map 5 more agressive/powerful? Say if we ran 2 gallons of e85 in a full tank of 93octane, which map is better to run (with flex wires)?

[Martin.328]

Originally Posted by Mike@N54Tuning.com

What gas are you using?

Mike

I only run 93 and I been on-call this week havent had a chance to mess around with it.

[MONSTAR]

Originally Posted by drivef30

Is map 2 or map 5 more agressive/powerful? Say if we ran 2 gallons of e85 in a full tank of 93octane, which map is better to run (with flex wires)?

You would want to run map 2. Map 5 is for 320i's I believe..

[Dfahmy]

Originally Posted by MONSTAR

Map 0: JB4 disabled
Map 1: Additive target, around 4psi over stock.
Map 2: Additive target, around 6psi over stock. Suggested for those with 93 octane and bolt on modifications. Also good for small E85 mixtures.
Map 3: Progressive WMI mapping.
Map 4: Stock performance with JB4 active for logging only.
Map 5: Autotuning map, absolute target of 11-17psi based on octane and conditions.
Map 6: User definable absolute target map. Suggested for troubleshooting by professionals only.
Map 7: Race gas map. Absolute target of 18.5psi. Requires straight unleaded race gas.

for the N20 map 5 is for the 320i's not an auto-tune

[anotheran]

Originally Posted by Dfahmy

for the N20 map 5 is for the 320i's not an auto-tune

exactly. good to hear lots of 335i owners here tho

N20/N26 mapping as of now:

Map 0: JB4 disabled.
Map 1: PWG models absolute target 21psi peak, EWG models additive 4psi peak over stock.
Map 2: PWG models absolute target 22psi peak, EWG models additive 6psi peak over stock.
Map 3: Progressive Methanol Injection. Requires BMS methanol kit or BMS FSB for meth pump control.
Map 4: Stock performance, JB4 on
Map 5: Absolute targeting map with a peak boost 17psi. Suitable for 320 & 520 applications.
Map 6: User definable absolute target map. Suggested for troubleshooting by professionals only.
Map 7: Race gas absolute target map. Peak boost 23psi. This is a fairly aggressive map and increases engine damage risk. Use with caution.

[feng]

i know this may be a silly question too, but is the car up to temp? I know for me i had inconsistencies with just the JB1 but significantly more noticable when cold. Even with no piggyback, it's 'ordinary' when not up to temp.

Again.. probably a silly question, but just thought I'd clarify.

[mbanks21]

Make sure the firmware is up to date. Do N20s have PWG/EWG differences like the N55? If so make sure you have the EWG harness

[mike@x-ph.com]

inconsistency can be due to lot of factors that are not related to the JB4
Why blame the JB4 when you did not even datalog?

[Martin.328]

Originally Posted by mike@x-ph.com

inconsistency can be due to lot of factors that are not related to the JB4
Why blame the JB4 when you did not even datalog?

Simple car is super smooth before jb4 and even map 4. Im hardly the firrst person to experience this, while doing some research I found many threads in this forum where people experience the exact same thing.

[mbanks21]

Originally Posted by Martin.328

Simple car is super smooth before jb4 and even map 4. Im hardly the firrst person to experience this, while doing some research I found many threads in this forum where people experience the exact same thing.

Yes but it could also be a simple setting in the JB4 menu that's causing the issue. Could be MAF issue or loose plug or any number of things. Logging will give you your answer.

[Martin.328]

Originally Posted by mbanks21

Yes but it could also be a simple setting in the JB4 menu that's causing the issue. Could be MAF issue or loose plug or any number of things. Logging will give you your answer.

I know man i just havent had a chance to, trust me I wanna dl I just havent had time. Besides I need to install windows. Its not a loose plug or else the same thing would happen in map 4.

[insanecoder]

Originally Posted by Martin.328

Hey guys new to the forums here and just wanted to give my thoughts on the jb4. I have a 16 328 that i inherited from my wife. I ordered intake, catless dp and ic pipes with the jb4. So far I have only gotten the jb4 and installed it couple days ago.

At first I was really impressed with both map 1 and 2. Very noticeable difference, car feels very strong all the way through redline. But then i started noticing inconsistencies in performance and little hiccups sometimes between 3-6k rpms. I gotta say its not confidence inspiring. I cant tell without logs but it feels like it might be pulling timing, might even be running too lean. So ill probably be returning it and going with one of the other options.

You sound like a guy not willing to tinker too much and I wouldnt blame ya so
I think yer doing the right thing returning it
and going with a simpler solution or waiting for a flash