JB4 S2 on N55 stutter between 4-5k when cold? - BMW 3-Series Forum (F30 / F32)

Alan l. · 12-23-2012, 06:29 PM

I've had my JB4 installed on my N55 535 for a few months now without any issues. The car has only 1800 miles on it and the tune has been good until this weekend. It's also much colder this weekend so not sure if it has anything to do with it. During warm up if I give the car slightly more throttle the car stutters and sounds like the exhaust is backfiring when it hits over 4k rpm and then goes back to normal. I made the car do it several times and so far only seems to do it before the car is fully warmed up.

Has anyone else notice issues in cold weather?

Alan

fotios335i · 12-23-2012, 06:49 PM

Ive had overly lumpy idle before but nothing like stuttering and backfire. The temp has been in the 30's the last couple days up here.

jsedlak · 12-24-2012, 02:46 PM

Maybe you shouldn't be hitting 4k+ on a cold, overboosted engine.

I'm no turbo freak, but don't these things need to warm up a bit before they spin nice and easily?

Alan l. · 12-25-2012, 12:33 AM

I don't normally even go over 3K during warm up but these cars take freaking forever to get the oil temps to the normal operating temperature sometimes you need the power to either merge onto the highway or avoid a situation. This is how i noticed this happening on my car.

AntBabeee · 12-25-2012, 05:12 AM

Remove the JB4 and test out the car and see if it still stutters.

tdizzle · 12-28-2012, 03:01 PM

I thought the jb4 had some feature that didnt activate it until the car reached a certain temp? (I dont have one so forgive me if I'm wrong. I'm still waiting to decide between the ppk and warranty vs the jb4 and more power)

Cfichman · 01-02-2013, 12:10 AM

jb4 on n54 had CAN bus capabilities that tapped into all variables and parameters of the engine so it could see what engine temp was. Thats what allowed you to change maps with volume/track buttons on steering wheel on e9x cars. on the n55 it is a different language I believe? So it will be a while for can features to be available. Right now its more of a set it and thats it tune.

TreDirtyFive · 01-02-2013, 04:40 PM

the JB4 does not kick in until the engine reaches safe operating temperatures.

Alan l. · 01-02-2013, 06:17 PM

FYI my temp gauge already moved when this occurs.

Mike@N54Tuning.com · 01-03-2013, 02:34 PM

The JB4 is different between each platform. So your best bet is to check with other F10 owners as it has its own special software and tuning different from E90 N55s, etc. There is no JB4 for the F30 yet. Only the Stage1.

Mike

12-23-2012, 06:29 PM	#1
Alan l. Brigadier General Drives: M-Sport 535xi Join Date: Jun 2009 Location: New York Posts: 3,709 iTrader: (8)	JB4 S2 on N55 stutter between 4-5k when cold? I've had my JB4 installed on my N55 535 for a few months now without any issues. The car has only 1800 miles on it and the tune has been good until this weekend. It's also much colder this weekend so not sure if it has anything to do with it. During warm up if I give the car slightly more throttle the car stutters and sounds like the exhaust is backfiring when it hits over 4k rpm and then goes back to normal. I made the car do it several times and so far only seems to do it before the car is fully warmed up. Has anyone else notice issues in cold weather? Alan __________________ Current - 2013 N55 535xi Msport SAT Retired - 2009 N54 335i Msport 6MT Retired - 2000 M52TU 323i ASA Supercharged 5MT More Photos of my car here Last edited by Alan l.; 12-23-2012 at 06:37 PM.
	Tweet

12-23-2012, 06:49 PM	#2
fotios335i Major General Drives: 12 BSM F30 sportline 335i Join Date: Jan 2007 Location: cape cod MA Posts: 6,517 iTrader: (61)	Ive had overly lumpy idle before but nothing like stuttering and backfire. The temp has been in the 30's the last couple days up here. __________________ 2012 335i sportline/Msport, M adaptive and vss, sport 8 AT, fully loaded, Black saphire, black dakota leather, M performance front grills, M performance shifter, M performance rear spoiler, M performance power kit, M performance exhaust, 19" 401's, morr vs8.2's coming someday..., front aero lip & more coming....

12-24-2012, 02:46 PM	#3
jsedlak First Lieutenant Drives: F30 335i 6spd Join Date: Sep 2012 Location: Morristown, NJ Posts: 346 iTrader: (0)	Maybe you shouldn't be hitting 4k+ on a cold, overboosted engine. I'm no turbo freak, but don't these things need to warm up a bit before they spin nice and easily? __________________ johnsedlak.com - web developer, designer

12-25-2012, 12:33 AM	#4
Alan l. Brigadier General Drives: M-Sport 535xi Join Date: Jun 2009 Location: New York Posts: 3,709 iTrader: (8)	I don't normally even go over 3K during warm up but these cars take freaking forever to get the oil temps to the normal operating temperature sometimes you need the power to either merge onto the highway or avoid a situation. This is how i noticed this happening on my car. __________________ Current - 2013 N55 535xi Msport SAT Retired - 2009 N54 335i Msport 6MT Retired - 2000 M52TU 323i ASA Supercharged 5MT More Photos of my car here

12-25-2012, 05:12 AM	#5
AntBabeee Lieutenant Drives: 2013 BMW 335i Join Date: Sep 2012 Location: Bay Area, CA Posts: 527 iTrader: (2) Garage List 2013 BMW 335i [0.00]	Remove the JB4 and test out the car and see if it still stutters. __________________ F30 BMW 335i M-Sport: Estoril Blue II, 19" Rims, Sports Auto, Premium, Technology, Harmon Kardon, Heated Front Seats, Driver Assistance...

12-28-2012, 03:01 PM	#6
tdizzle Captain Drives: 2012 335i Sport Join Date: Aug 2012 Location: Memphis Posts: 741 iTrader: (0)	I thought the jb4 had some feature that didnt activate it until the car reached a certain temp? (I dont have one so forgive me if I'm wrong. I'm still waiting to decide between the ppk and warranty vs the jb4 and more power)

01-02-2013, 12:10 AM	#7
Cfichman Private First Class Drives: F30 335i AW M Sport Join Date: Dec 2009 Location: Miami/Orlando Posts: 101 iTrader: (0)	jb4 on n54 had CAN bus capabilities that tapped into all variables and parameters of the engine so it could see what engine temp was. Thats what allowed you to change maps with volume/track buttons on steering wheel on e9x cars. on the n55 it is a different language I believe? So it will be a while for can features to be available. Right now its more of a set it and thats it tune.

01-02-2013, 04:40 PM	#8
TreDirtyFive Captain Drives: 335i Coupe Join Date: Jun 2008 Location: Los Angeles, CA Posts: 872 iTrader: (8)	the JB4 does not kick in until the engine reaches safe operating temperatures. __________________ 335 F30 MSport: N55.Tech.NAV.+ 135 DCT:N55.Prem.Sports.NAV.IPod X-335 E92: Prem.Sports.NAV.IPod Audi A3: Sports.Tech.NAV.sways.DP.K2 Coils.Flash.etc X-67 Baracuda Fastback: DragGears.Sway.etc.

01-02-2013, 06:17 PM	#9
Alan l. Brigadier General Drives: M-Sport 535xi Join Date: Jun 2009 Location: New York Posts: 3,709 iTrader: (8)	FYI my temp gauge already moved when this occurs. __________________ Current - 2013 N55 535xi Msport SAT Retired - 2009 N54 335i Msport 6MT Retired - 2000 M52TU 323i ASA Supercharged 5MT More Photos of my car here

01-03-2013, 02:34 PM	#10
Mike@N54Tuning.com Lieutenant General Drives: 07335i Join Date: Dec 2008 Location: Earth Posts: 12,353 iTrader: (78)	The JB4 is different between each platform. So your best bet is to check with other F10 owners as it has its own special software and tuning different from E90 N55s, etc. There is no JB4 for the F30 yet. Only the Stage1. Mike __________________ Lowest Price GUARANTEED on ALL PRODUCTS!! JB4 G5 On Sale - FREE Shipping Click Me - NEW JB4(N55) & DCI's $95.00 NEW F30-328 N20 Tune(Stage1) BMS Oil Catch Can (On Sale)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search