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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > 335i Stock + JB4 = Airy?



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      03-06-2012, 03:39 PM   #1
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335i Stock + JB4 = Airy?

So I recently put the JB4 Stage 1 on my 335i which is otherwise completely stock. I can say that when I really just hammer it that there seems to be a little more power/kick under WOT. However, I find that I'm missing that throw me to the back of my seat feeling that I had with the stock tune...or maybe I'm just looking for it now and it isn't there? Someone said that it could be my power curve smoothing out some from the tune, and thus I have a smoother climb in power as opposed to that wham! power on the stock map?

Regardless of that it sometimes feels, especially on surface streets, that when i get on the gas that it is a bit....airy? Almost like the power just isn't there? It is hard to describe the feeling. This is when I'm under about half-open throttle, or if I'm slowly building up speed as opposed to just pushing the pedal to the floor.

I do have the Stage 2 in the mail, so maybe that will fix it? If not, maybe I can take a data log and see if there is an issue?
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      03-06-2012, 03:47 PM   #2
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how much are you boosting??
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      03-06-2012, 04:04 PM   #3
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how much are you boosting??
Not sure. I'm running the Stage 1 so it doesn't have the in-dash boost gauge. I'm guessing whatever the Stage 1 sets to for a stock car.
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      03-06-2012, 04:06 PM   #4
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Get downpipes.. I bet you'll delete this thread.. Lol
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      03-06-2012, 04:20 PM   #5
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Get downpipes.. I bet you'll delete this thread.. Lol
Yah, already discussing this in another thread. I want catless, but I live in Texas. So until they come up with a DP fix that will spoof the sensor reading over the OBDII port, I can't pass inspection with catless.
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      03-06-2012, 05:22 PM   #6
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Get a cantool and leave it plugged in.. That will get rid of codes and cel.. Emissions is tough cause we have them here too but there's way to go around that..
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      03-06-2012, 05:25 PM   #7
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Originally Posted by gustnyc View Post
Get a cantool and leave it plugged in.. That will get rid of codes and cel.. Emissions is tough cause we have them here too but there's way to go around that..
Well once I get the Stage 2 I won't be to worried about codes/CELs because it can clear them. But for our emission test, the sensors have to read as Ready instead of Not Ready or Failed. And we have to have 2 out of 3 read as Ready to pass.
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      03-06-2012, 06:52 PM   #8
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There's no way around the emissions test with a catless DP unless you either
a) fool the sensors (see "dp fix" for N54 ... doesn't commercially exist for N55 yet)
b) uninstall it, put stock back in and drive around for the requisite amount of time

ronny214 is 100% spot on about clearing the CEL ... that will not help with inspection. Just gets rid of that annoying dash light.
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      03-06-2012, 08:21 PM   #9
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Quote:
Originally Posted by ronny214 View Post
So I recently put the JB4 Stage 1 on my 335i which is otherwise completely stock. I can say that when I really just hammer it that there seems to be a little more power/kick under WOT. However, I find that I'm missing that throw me to the back of my seat feeling that I had with the stock tune...or maybe I'm just looking for it now and it isn't there? Someone said that it could be my power curve smoothing out some from the tune, and thus I have a smoother climb in power as opposed to that wham! power on the stock map?

Regardless of that it sometimes feels, especially on surface streets, that when i get on the gas that it is a bit....airy? Almost like the power just isn't there? It is hard to describe the feeling. This is when I'm under about half-open throttle, or if I'm slowly building up speed as opposed to just pushing the pedal to the floor.

I do have the Stage 2 in the mail, so maybe that will fix it? If not, maybe I can take a data log and see if there is an issue?

I have the same issue. Especially after a fast shift and back on the throttle. It feels like sometimes the tune is engaged, other times it feels like its not. I am going to do some logging this weekend and see if there is any evidence there. Let me know if you figure anything out in the meantime.
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      03-06-2012, 08:35 PM   #10
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Solutions:

A) Trade in your N55 for an N54.
B) Replace your 335I With a M3/5/6
or
C) Sell your house and Buy a Ferrari F12 and Live in it.
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      03-06-2012, 10:09 PM   #11
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Quote:
Originally Posted by Swerd430 View Post
I have the same issue. Especially after a fast shift and back on the throttle. It feels like sometimes the tune is engaged, other times it feels like its not. I am going to do some logging this weekend and see if there is any evidence there. Let me know if you figure anything out in the meantime.
Terrysaid for the n55 there is major turbo lag and that the stage2 should fix it. So ill see in a couple days.
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      03-06-2012, 10:24 PM   #12
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I'm running the same setup you have (orig. poster) but the stg 2 JB4.... had the car on a mustang dyno last weekend (which will typically show way lower numbers than other dyno rigs)...

here's my output....



Run 2 is a tunes n54 and not my setup. Only runs 1 & 3 are mine.
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      03-06-2012, 10:33 PM   #13
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Yeah Im running stage 2 and I don't have any of these issues. Good luck!
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      03-07-2012, 12:14 AM   #14
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OP, I just realized you only had the Stage I installed. Stage II is MUCH MUCH better.

I had the Stage I installed for about five months, just recently removed and went back to stock (I have Stage II in the mail as well). It didn't do much for me. It gives a bit more pull at the top end (4k+) but down low ... unnoticeable. I felt it made the car feel sluggish accelerating from a stop (might have just been a relative thing since the top end was stronger). The stock tune is linear, predictable, and overall more driveable.

I had the opportunity to drive a Stage II-equipped N55 and it pulls like a mofo all the way through the rev band. Definitely worth the upgrade. Either stay with stock or go Stage II.
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      03-07-2012, 12:32 AM   #15
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I have a stage 1 jb4 on my n55 and i don't have that problem at all. Whether if i slowly feed it gas or just punch it all the way it pulls hard. Big difference from stock and i don't really have turbo lag at all.
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      03-07-2012, 01:24 AM   #16
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I have the Stage 1 still. I know what you mean, OP. I hear this is resolved with Stage 2.

I am dying to get my DME updated so that I can upgrade. If you can upgrade to Stage 2, do it.
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      03-07-2012, 07:43 AM   #17
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I ordered Stage 1 and Stage 2 at the same time. Stage 2 wasn't sent with Stage 1, so I ran Stage 1 for about two weeks until Stage 2 came in and I had time to get it installed.

I noticed what you have posted OP with Stage 1. When you get Stage 2, that airy feeling will go right away. I also put in the BMS catless downpipe. I would highly recommend it.

When are you due for inspection? I would put the catless downpipe in and enjoy it then swap it out for stock to pass inspection.

Can you find any local shops that can maybe slap an inspection sticker on there for you for a minimal fee and keep the catless downpipe in when the time comes?

Good luck!
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      03-07-2012, 09:20 AM   #18
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Thats because you dont have stage 2!
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      03-07-2012, 09:21 AM   #19
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Quote:
Originally Posted by badblk335i View Post
I ordered Stage 1 and Stage 2 at the same time. Stage 2 wasn't sent with Stage 1, so I ran Stage 1 for about two weeks until Stage 2 came in and I had time to get it installed.

I noticed what you have posted OP with Stage 1. When you get Stage 2, that airy feeling will go right away. I also put in the BMS catless downpipe. I would highly recommend it.

When are you due for inspection? I would put the catless downpipe in and enjoy it then swap it out for stock to pass inspection.

Can you find any local shops that can maybe slap an inspection sticker on there for you for a minimal fee and keep the catless downpipe in when the time comes?

Good luck!
What do you mean it didnt come together? Did you order them from different vendors or something? Im a little confused.
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      03-07-2012, 10:39 AM   #20
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Stage 2 is just a new box and a few wires including can.
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      03-07-2012, 11:14 AM   #21
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Quote:
Originally Posted by badblk335i View Post
I ordered Stage 1 and Stage 2 at the same time. Stage 2 wasn't sent with Stage 1, so I ran Stage 1 for about two weeks until Stage 2 came in and I had time to get it installed.

I noticed what you have posted OP with Stage 1. When you get Stage 2, that airy feeling will go right away. I also put in the BMS catless downpipe. I would highly recommend it.

When are you due for inspection? I would put the catless downpipe in and enjoy it then swap it out for stock to pass inspection.

Can you find any local shops that can maybe slap an inspection sticker on there for you for a minimal fee and keep the catless downpipe in when the time comes?

Good luck!
Inspection is due in august. I may rip the sticker off, though, because the corner is peeling and my OCD is kicking in on it and just go get my inspection early...I wonder how much inspections run? I've never had to get one before. This is my first car registered with Texas plates.

Anyways, I wish I could find a backwater shop who would slap it on for a few extra bucks. HAHA. But in all honesty if I can do my inspection this month and it last for a year, surely by the time the next inspection comes around someone will have cracked the ECU on the N55 and come out with a DP fix like the N54 has.

Decisions...decisions...
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      03-07-2012, 12:04 PM   #22
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Quote:
Originally Posted by ronny214 View Post
Inspection is due in august. I may rip the sticker off, though, because the corner is peeling and my OCD is kicking in on it and just go get my inspection early...I wonder how much inspections run? I've never had to get one before. This is my first car registered with Texas plates.

Anyways, I wish I could find a backwater shop who would slap it on for a few extra bucks. HAHA. But in all honesty if I can do my inspection this month and it last for a year, surely by the time the next inspection comes around someone will have cracked the ECU on the N55 and come out with a DP fix like the N54 has.

Decisions...decisions...
Inspection cost $10 over here.
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