[caradd]

Originally Posted by Mike@N54Tuning.com

There are thousands of the JB+ system in use over the past few years and thousands of a similar (although inferior) tune called the SSTT in use as well. Never heard of a single related break down, melted plug, or anything that would indicate they are unreliable or reduce the lifespan of the motor. Many customers have 100k miles on these tunes now. It's a 2-3psi increase over stock. The fueling is closed loop and runs the OEM air/fuel ratios and the advance curve learns out 1-2 degrees. The OEM tuning runs more boost than the JB+ does on hot days and/or high elevation. If the question is whether the JB4 is worth the extra money and install effort then I'd say it definitely is but the JB+ is rock solid reliable and probably the safest tune you can put on an N54.

Mike

Thanks Mike for the info.

[caradd]

Originally Posted by Mpower77i

Any hard dyno #s out there? DCI/JB @ 75% vs DCI/JB4 map 1 or 5?

Here's a similar dyno.

[Turkeybaster115]

This thread is filled with a lot of miss information IMHO. Needless JB+, and SSTT bashing. Both do the same thing with JB+ being more advanced because you can adjust the settings. You need to get SSTT2, to adjust the settings, like JB+. JB4 is in the same league as Procede, COBB, GIAC, and other advanced tunes. Nothing wrong with them, as long as you save up money for the inevitable increased wear and tear on OEM parts, like the engine, HPFP, and Transmissions.

OP seems to be primarily concerned with obtaining dyno graphs, in order to compare JB+ on max vs JB4 on its lowest setting. Here are graphs you can use to compare:

2008 335I Steptronic
JB4 on lowest setting
BMS filter
96 octane

http://bmw.pencilgeek.org/showDyno.php?recID=413

2008 335I steptronic
Britalman exhaust
JB+ (most likely 50%)
91 octane

http://bmw.pencilgeek.org/showDyno.php?recID=416

[Diablo335]

Old thread but rather than start a new one...I'm trying to decide between JB+ and JB4.

- I will never run meth
- I will never run E85 blend
- I can't buy 93 octane

What I really want is smooth power off idle, and that extra pop for passing and freeway merges. And for kicks. What I don't want (and what seems to come with the JB4) is hassles over misfires or other engine codes. This all seems to point me to the JB+, but the JB4 is more sophisticated in many ways...

A thought...can the JB4 be detuned down a bit from Map 1? Say, closer to the JB+?

[Marcadelic]

When I had the jb+ on my car it caused misfires and my fuel pump failed, happened 2x's. switched to the jb4 and haven't had a problem sense.

The jb4 is worth the money, much safer imo

[Morpeh]

I have the same question as Diablo + I still have 3 years of full warranty.

Thank you

[n54door]

Originally Posted by Marcadelic

When I had the jb+ on my car it caused misfires and my fuel pump failed, happened 2x's. switched to the jb4 and haven't had a problem sense.

The jb4 is worth the money, much safer imo

That has more to do with BMW than the JB

I'll put it this way, if you had any tune on you car it would have happened, given the history of misfires/HPFP issues with our cars on even stock setups.

JB4 has the most power under the curve compared to the JB3, so it's very much worth it!

JB+ is just a tease IMO.

[prohumanitate]

Originally Posted by Diablo335

Old thread but rather than start a new one...I'm trying to decide between JB+ and JB4.

- I will never run meth
- I will never run E85 blend
- I can't buy 93 octane

What I really want is smooth power off idle, and that extra pop for passing and freeway merges. And for kicks. What I don't want (and what seems to come with the JB4) is hassles over misfires or other engine codes. This all seems to point me to the JB+, but the JB4 is more sophisticated in many ways...

A thought...can the JB4 be detuned down a bit from Map 1? Say, closer to the JB+?

I was in the same boat as you and bought a JB+. I run it at 70% and am really happy with the added power (I know they say you'll want more later but I haven't reached that point yet). Really the biggest thing I think I'd appreciate about JB4 is the ability to open/close the exhaust flap on the fly. But again, I'm a noob.

[Diablo335]

I exchanged some emails with the JB guys. I ordered the JB4 since it manages/monitors more functions (oil temp, exhaust flap, water pump, etc.). The ability to read/reset engine codes is also a nice feature. Don't have to buy a separate device for that.

[tex05]

Originally Posted by Diablo335

I exchanged some emails with the JB guys. I ordered the JB4 since it manages/monitors more functions (oil temp, exhaust flap, water pump, etc.). The ability to read/reset engine codes is also a nice feature. Don't have to buy a separate device for that.

Hey Diablo,
So how do you like the JB4?

[vertigo44]

Besides the CPS wire. Does the full JB4 G5 have control over ignition timing or does it rely on the DME to do that?

[E90Company]

Originally Posted by vertigo44

Besides the CPS wire. Does the full JB4 G5 have control over ignition timing or does it rely on the DME to do that?

The DME's tune controls the timing.

[Jnat]

JB4 G5 ISO FTW. Other then that, get or add the Cobb but for a daily driver, the JB4 is very strong/smooth and reliable.

[jamroc]

Originally Posted by Used2335

Good call, safety is one of the main reasons I've pulled my jb+ off the car. I had a reflash done on my 2.0t vw and it really made an all around difference on the car. The feeling wasn't so all around for me on the jb+ (could just be mental). Is this what I should expect with a

JB4 is very smooth when you hit the pedal to the metal. JB+ not as smooth. Also JB4 can be enabled/disabled on the fly from the steering wheel buttons and has a built in safety feature. Better bang for buck, More power and maps to choose from to best suit your current and future upgrades. I had Both so i know what i'm saying... Get the JB4... (BMW 335i coupe)