BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

Post Reply
 
Thread Tools Search this Thread
      09-02-2012, 08:39 AM   #1
eazyefromli
Enlisted Member
United_States
1

 
Drives: 2010 135i Coupe
Join Date: Nov 2011
Location: Los Angeles, CA


Posts: 33
iTrader: (0)

N54 Jb4 Issue - Pulsating/Uneven Boost

Hey guys, I've done a bunch of searching on the forums and on google and can't seem to find an answer. Sorry if this is something that's been answered, if so, please link to the info!

Anyways, I have a 2010 135i. I purchased a JB4 PnP back in december or january, I can't remember exactly when, but I didn't have a chance to install it until a couple weeks ago (waiting for services, moving across the country, a bunch of stuff came up). I installed it last friday after having my 30k mile service from BMW and have had one major issue.

I noticed that under heavy acceleration (but not full throttle, maybe 3/4 throttle) that my car is not boosting evenly. In any map that I've tried (1, 2, and 5) I'm having issues with the boost 'pulsating'. According to the hijacked boost gauge I am peaking at around 14psi average, but intermittently pulsating between 14psi and around 8psi. Under full throttle I don't really notice any issues.

I was wondering if anyone had any similar problems, and if so, what their solution was.

The only other mod I'm running is a BMS DCI, and I'm running 91 octane at around 3-5k ft altitude.

Thanks.
Appreciate 0
      09-02-2012, 09:17 AM   #2
Elsabor67
aiming for 450.....
Germany
40

 
Elsabor67's Avatar
 
Drives: La Jeva ;-)
Join Date: Feb 2009
Location: Stuttgart, Ge :-)


Posts: 2,622
iTrader: (25)

Garage List
2009 135i  [5.00]
Check what firmware you have and shoot a log to Terry. If it's what I think it is, it has already been fixed on the firmware because I had a slight pulsating issue before and with the logs that I and others had sent it was fixed.

Also, go here: http://www.n54tech.com/forums/showthread.php?t=10605

There is alot of information adn should be able to find other information too.

Good luck.
__________________

Quote from Ezeedee regarding car mods:
"you're only done when you sell the car "
Appreciate 0
      09-02-2012, 09:28 AM   #3
eazyefromli
Enlisted Member
United_States
1

 
Drives: 2010 135i Coupe
Join Date: Nov 2011
Location: Los Angeles, CA


Posts: 33
iTrader: (0)

Thanks for the response/link. I shot an email over to Terry and I will try updating the firmware. I'm sure this information is available somewhere, but does anyone know the software/hardware requirements for doing the firmware update?

Edit: I'm sorry for asking dumb questions: but is a PC required to create a log from the JB4? I have a mac laptop, but can probably install software to run a PC program if it's necessary.

Last edited by eazyefromli; 09-02-2012 at 09:34 AM.
Appreciate 0
      09-03-2012, 01:15 AM   #4
mcmn
Captain
8

 
Drives: MY10 AW 135i
Join Date: Jun 2011
Location: Sydney


Posts: 631
iTrader: (0)

a pc is required to log on a mac, you can run vmware or something similar to achieve this


Are you getting a check engine light at all coming on?

It might actually not be the tune, but represent an issue with either your Fuel Pump/Injectors or Ignition Coils/spark plugs.
Appreciate 0
      09-03-2012, 04:13 AM   #5
Tech112
New Member
Canada
0

 
Drives: 2011 135i N55 DCT
Join Date: Oct 2011
Location: Montreal


Posts: 25
iTrader: (0)

I have had a similar problem but at about 20% throttle around 100-130 km/h on all maps except 0. I've tried every firmware for the last year all do the same. I have an N55 though. This pulsing isn't very annoying so I haven't complained yet.
__________________
Appreciate 0
      09-03-2012, 08:52 AM   #6
IZAGLO
Mbira
United_States
13

 
Drives: Sedonna Red 09 135i SOLD
Join Date: Jan 2010
Location: Garage cleaning Brake Dust


Posts: 1,009
iTrader: (3)

My experience with the JB4 was that it either likes to be driven hard most of the time or mild and the car would run smooth....Unlike the stock tune that is smooth no matter what the JB4 in my experience would also run like crap till the car adapts to either style till a few hard pulls are done, if you want to go fast it would take a few hard pulls to consistanly run smooth. My car would run silky smooth alway's at mild rpms till i wanted to go WOT or three quarater throttle then it would be rough till i did a few hard runs then smooth out...This is the reason i am stock now and will get another tune to try later...I had an issue with the JB4's in-consistancy or rather my inconsistant driving habits...I do like to drive slow at times as our local speed limits on my backroads are 30-50...so......i am not looking for tickets. But i do get some nice pulls in and some aggressive drives on some of the twisties. Right now i am appreciating the stock tune...i love the smoothness!
__________________
Appreciate 0
      09-03-2012, 04:56 PM   #7
foghat
Captain
Canada
16

 
Drives: 2008 135i
Join Date: Jun 2009
Location: Great White North


Posts: 913
iTrader: (1)

might want to changes plugs. I had a bit of a hesitation or hiccup when going part throttle in 2nd gear. Changed the plugs and hesitation gone.
Appreciate 0
      09-04-2012, 01:31 PM   #8
revo 3vom
It's move over
United_States
3

 
Drives: White 135i
Join Date: Mar 2012
Location: Bartlett, ILL


Posts: 135
iTrader: (1)

Send a message via AIM to revo 3vom Send a message via Skype™ to revo 3vom
Boost Leak?

I was noticing these same symptoms when i first put the jb4 in... i upgraded my charge pipe and dv's problem seemed to be at bay... on occasion it will hiccup. Most likely a tune issue that will be addressed.
Appreciate 0
      09-17-2012, 04:57 AM   #9
eazyefromli
Enlisted Member
United_States
1

 
Drives: 2010 135i Coupe
Join Date: Nov 2011
Location: Los Angeles, CA


Posts: 33
iTrader: (0)

Quick update:

I finally installed the USB cable to the JB4, but I haven't been able to get any logs yet, I still need to find someone with a PC who is willing to come on a high speed mountain drive with me.

However, the problem has gotten worse, to the point that I just keep it on stock mode 95% of the time now; basically any time I'm not doing full throttle pulls.

revo 3vom: I've been considering upgrading my DV's. I had an issue a long time ago with my 95 Audi S6 that was somewhat similar to this problem, and it turned out to be a bad diverter valve. The main difference being that that was a 10+ year old car with 100k+ miles on it, and I was running approximately 100% higher than the stock horsepower. This is a 2 year old car running around a 30% increase from stock horsepower so I'd like to think the stock DV's could handle it.

Anyone have experience with aftermarket/performance DV's or BOV's?

As far as changing plugs goes: I really doubt that's the problem. I have absolutely zero problems in stock mode, no matter how hard I get on it, but in ANY map I have problems, even when I'm not going very hard (although it's much worse when I do go hard on it).

I really appreciate everyones help. I'm going to try to get some logs this week. On a side note: I hit a fucking deer the other day, super excited about that repair bill.
Appreciate 0
      09-18-2012, 11:01 PM   #10
foghat
Captain
Canada
16

 
Drives: 2008 135i
Join Date: Jun 2009
Location: Great White North


Posts: 913
iTrader: (1)

I agree plugs are likely not the issue if your problem is so severe. But Just because you don't have any issues when stock does not mean plugs may not be at least part of the problem. I believe terry recommends doing the plugs about every 24,000 miles when running jb4.

I had about 23,000 miles on mine when I was getting hesitation at part throttle. No hesitation at all when I was stock. New plugs, hesitation gone when using jb4.
Appreciate 0
      09-19-2012, 02:21 AM   #11
SteveAZ
Captain
8

 
Drives: 135i Cab
Join Date: Jul 2012
Location: Phoenix, AZ


Posts: 614
iTrader: (5)

I recently did a JB4 install as well and saw similar characteristics. It wouldn't do it all the time, but in the beginning it did it about 50% of the time. I did a couple things at once and it has greatly improved. Not sure if it's the car getting used to the tune, the fact that I changed gas stations (only use Shell or Chevron now, I was using Costco), or the fact that I put an intercooler on. Given I live in Phoenix it's pretty warm here so I've been waiting until the weather cools to really test it and see if I have an issue or not. I can say I noticed an immediate difference with the IC but I was very meticulas about the hoses sealing. Plus I've only had the car for about 1500 miles (it has 26K) with a small fraction of that being run with JB4 so I'm still getting used to it all. It does seem to have improved a lot, however I've only run on map 1 and don't change my settings. Waiting to do a couple more upgrades before I use map 2.

I too need to take logs but when I installed the software it keeps telling me I have a previous version and fails install, haven't gotten serious enough about it yet to really delve in to it but it's coming.

Short term I'm planning on...
new spark plugs
DCI
OCC
DPs (after the first of the year and emissions are done)
Vent gauge (to make it easier to monitor things)
...and will go from there. If all is good and as I gain confidence with the car, I'll go to map 2.

If I'm not happy with it I'll probably go to the COBB, I like the flexability of the JB4 tune, but I don't like all the additional connections and additional processors. Flashing seems like a better way to go and since my car is out of warranty...no worries anyways.
Appreciate 0
      09-19-2012, 07:01 AM   #12
b1aze
Just one more taste...
United_States
22

 
Drives: 2010 135i
Join Date: Aug 2012
Location: Shirley, MA


Posts: 1,419
iTrader: (14)

I have noticed that my hijacked boost gauge will read between 14.5ish to 12 and waver between them in a pull. This could be a few things and it may not actually be varying that much. It could easily be gauge inaccuracy. My IAT hijacked gauge will bounce between a few readings just cruising at 75 on a cool day. I'm talking 10+ degree jumps and I can't imagine it's actually increasing and decreasing that quickly. Until I pull some logs showing boost pressure is varying, I'll chalk it up to gauge variability.
Appreciate 0
      03-04-2013, 10:33 PM   #13
C4747Z
Second Lieutenant
United_States
4

 
C4747Z's Avatar
 
Drives: VO 1M
Join Date: Oct 2008
Location: Long Island, NY


Posts: 217
iTrader: (0)

Send a message via AIM to C4747Z
Did you ever fix the problem? I was having the same issue with my 1m. It only happened at 70 percent throttle.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 08:37 PM.




1addicts
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST