[435iDriver]

Hey Guys,

i need some real world information about the topic JB Stage 1 and JB4 on N55 Engines.
I know, here are a lot experiences and reviews - but i hardly need some reliable sources.

I want to know if anyone here ever had the JB Stage 1 and JB4 installed on their 35i. Can you give me please a review about what is the better choice?
Would you recommend the JB4 over the JB Stage 1?

What hp output does the JB Stage 1 and the JB4 generate on a fully OEM Car without Downpipes or any other mods?

The dynocharts on http://www.burgertuning.com/ show less HP outcome than promissed on the product pages.

JB Stage 1 N55:

Power gains on an otherwise stock car are up to 40hp and 50tq to the wheels

Stock: 277hp - ca. 300ft-lbs (for the german guys here: 408Nm)
JB Stage 1: 307hp - ca. 350ft-lbs (for the german guys here: 476Nm)
Gains: +30hp - +50ft-lbs (for the german guys here: +68Nm)

You can see on a second M235i dyno on burgertuning.com that the +30hp / +50ft-lbs seem to be reproducible on other cars.
The gains are: 295hp to 323hp (+28hp) / 330ft-lbs to 365ft-lbs (+35ft-lbs / +48 Nm)

JB4 N55:

about up to 60hp to the wheels (80hp crank) on a completely stock car

This is the only stock chart i found:

Stock: 277hp - ca. 300ft-lbs (for the german guys here: 408Nm)
JB4: 349hp - ca. 400ft-lbs (for the german guys here: 544Nm)
Gains: +72hp - +100ft-lbs (for the german guys here: +136Nm)

Total gains JB4 over JB Stage 1:
JB Stage 1: 307hp - ca. 350ft-lbs
JB4: 349hp - ca. 400ft-lbs
Total: +42hp - +50ft-lbs

Are these charts representative or are there any problems with the value of this gains?

Does anyone here ever measured your 0-60 / 0-62 times?

I look forward to your answers.

Thank you!

Greetings from Germany and please excuse my english

[Mike_L]

The charts are lower because they're wheel horsepower. The advertising is flywheel power. Its generally 15-20% lower at the wheels than the flywheel due to parasitic losses..

Also, peak gains don't always happen at power peak. There could be a peak gain of 60hp at 3000rpm, but peak power hits at 5800rpm where the gain is less, so the chart would show a lower gain when it reports maximum power.

[335i_4D]

^This

From what I've read on different sources (including this forum):

- Stage 1 should be used if you don't plan on any other mods (ex: DP, FMIC, etc.)
- JB4 if you plan to do more mods.

A member was supposed to post differences (on the same dyno) between:
- Stock
- Pre electronic wastegate MPPK
- EW MPPK
- JB Stage 1
- JB4
- Dinantronic

Still waiting

[435iDriver]

Originally Posted by Mike_L

The charts are lower because they're wheel horsepower. The advertising is flywheel power. Its generally 15-20% lower at the wheels than the flywheel due to parasitic losses..

Also, peak gains don't always happen at power peak. There could be a peak gain of 60hp at 3000rpm, but peak power hits at 5800rpm where the gain is less, so the chart would show a lower gain when it reports maximum power.

Okay, thank you!

Is it possible to drive the JB4 with a stock car and gain around 350hp on the wheels?


Is here anyone who drives a stock 35i with JB4?

Originally Posted by 335i_4D

^This

From what I've read on different sources (including this forum):

- Stage 1 should be used if you don't plan on any other mods (ex: DP, FMIC, etc.)
- JB4 if you plan to do more mods.

A member was supposed to post differences (on the same dyno) between:
- Stock
- Pre electronic wastegate MPPK
- EW MPPK
- JB Stage 1
- JB4
- Dinantronic

Still waiting

That would be exactly what i am searching for.

I don't plan any other mods. - Maybe a new Airbox -
But if a get 41hp more over the JB Stage 1 output on a totally stock car I would definitely invest the 200$ for the JB4.

[FC4]

Originally Posted by gamaR

Okay, thank you!

Is it possible to drive the JB4 with a stock car and gain around 350hp on the wheels?

Member "olaosunt" was making 400 RWHP on a Dynojet with the only modification being a JB4 (Map 7 on E30 fuel).

[Jchan112]

From my understanding if you are not using 93+ octane fuel you can only run Map 1 with the JB4. For that reason I ordered stage 1, which is always upgradable to stage 2. Only performance upgrades I have is an AFE intake & MPE.

[Dosturbos]

I am driving an otherwise stock car with JB4. I have the M Performance exhaust and a drop in air filter. I have free'd up some airflow, but otherwise this car is pretty close to stock.
You're getting more control (safeguards) over the vehicle with the JB4, than the stage 1. There are more sensors that go in line with the Jb4 than just the stage 1.
That being said, I am not sure how much greater the gains are in real life.
My impression of the car, on a dry day that isn't very hot or too cold is that the JB4 screams in Sport mode.
If it is humid or muggy forget about it, power seems to be stock.
I have fed other F30's their lunch in my car though so the Jb4 definitely works in terms of power gains and performance.
Without a Downpipe I think your chances of hitting 350WHP are very slim to nonexistent.
The Dyno's I have access to locally are Mustangs, which read very low, so any car you put on there is going to piss on your parade a little.
If you want to stroke your ego a bit, put the car on Dynapak and call it a day.

Originally Posted by gamaR

Okay, thank you!

Is it possible to drive the JB4 with a stock car and gain around 350hp on the wheels?


Is here anyone who drives a stock 35i with JB4?




That would be exactly what i am searching for.

I don't plan any other mods. - Maybe a new Airbox -
But if a get 41hp more over the JB Stage 1 output on a totally stock car I would definitely invest the 200$ for the JB4.

[TayF80]

I have a 435xi with the stage 2 JB4. I see some good increase in sport mode. Lookin to get a new airbox and either a charge pipe/downpipe. Car is under lease so debating what to do.

[435iDriver]

Originally Posted by Jchan112

From my understanding if you are not using 93+ octane fuel you can only run Map 1 with the JB4. For that reason I ordered stage 1, which is always upgradable to stage 2. Only performance upgrades I have is an AFE intake & MPE.

Okay i see that.
Are you glad about your decision to take the Stage 1?
Do you feel the HP increase?

Does the MPE give you a Better Performance? I always thought, that tis is only a sound upgrade.

Originally Posted by Dosturbos

I am driving an otherwise stock car with JB4. I have the M Performance exhaust and a drop in air filter. I have free'd up some airflow, but otherwise this car is pretty close to stock.
You're getting more control (safeguards) over the vehicle with the JB4, than the stage 1. There are more sensors that go in line with the Jb4 than just the stage 1.
That being said, I am not sure how much greater the gains are in real life.
My impression of the car, on a dry day that isn't very hot or too cold is that the JB4 screams in Sport mode.
If it is humid or muggy forget about it, power seems to be stock.
I have fed other F30's their lunch in my car though so the Jb4 definitely works in terms of power gains and performance.
Without a Downpipe I think your chances of hitting 350WHP are very slim to nonexistent.
The Dyno's I have access to locally are Mustangs, which read very low, so any car you put on there is going to piss on your parade a little.
If you want to stroke your ego a bit, put the car on Dynapak and call it a day.

Thank you for this statement.
It is the first tame that i read, that the hp increase of a JB4 is not always noticeable.

I know the problem of dyno charts... If you can do a before/after run on the same dyno they give you a relativly reliable number of the hp increase but you cannot compare Californan Dynos with the german ones.

Originally Posted by TayE90

I have a 435xi with the stage 2 JB4. I see some good increase in sport mode. Lookin to get a new airbox and either a charge pipe/downpipe. Car is under lease so debating what to do.

Are there differences between the Sport/Comfort/Eco mode?

[Dosturbos]

Are there differences between the Sport/Comfort/Eco mode?

There are definite differences in those modes with the JB4 and just in general with the car. Not only does the exhaust valve open up in sport mode, but the car has way more torque. This is where the JB4 and JB stage 1 really shine.
From a dead stop to 50/60MPH The car feels like a beast. This is where I start to miss the longer gears of my old 6AT N54. I feel like all the shifting that starts to happen kind of kills the acceleration experience. That being said, the shifts are smooth and the exhaust sounds mean.

[mike@x-ph.com]

Get the Jb4.
It offers more power, smoother delivery, more features, flexibility, etc...

[chromatic]

OP i was in the same boat but I went with JB stage 1 and I am very happy with it, mainly because of no wire splicing and its easy to remove if any issues. The power is more than enough for daily use - my 2 cents.

[r33_RGSport]

@435iDriver, before I started selling BMS products, I used their products a few times.
Here are the history of my usings.

2012 F10 528i
- Started with JB Stage 1: Great power addition to the engine and better response.
- Upgraded to JB4 Stage 2 since I have a Catless downpipe: Much more power gain and much better control on the engine. Also clears out the CEL.
Other than the catless downpipes, I don't have any other mods to the 528i since it is wife's car.

2014 F15 X5 sDrive35i.
- Started with JB Stage 1, since BMS said only Stage 1 that is compatible with all the X'series. It was great addition, the X5 feels lighter with the extra power.
- Upgraded to JB4 Stage 2, since I found out that the DME is actually the same part number as my 5 series. And it worked. Currently got BMS air intake, EWG/FF harness, and custom muffler. Overall experience, JB4 Stage 2 has much more capability than the JB Stage 1 in stock condition. Even in my stock condition, I was able to run Map 2 on my X5 since the exhaust system is pretty much straight through. Now with all the mods, the X5 feels like a 5 series. Quick and nimble.
Still trying to find the sweet spot on the mapping.