JB+

Kaps335i · 05-31-2018, 05:28 PM

I wouldn't necessarily say the engine is lugging, but that is the best way I can describe it, and it only happens when the JB+ is installed.

I've had the JB+ for probably a year now in my 2013 335i xDrive MT that has 36,000 miles. This started happening recently. When the engine is cold and usually between 2-3k RPMs it lugs. At first I thought to myself "did I forget how to drive a stick?" But I made sure the clutch was fully engaged and it still happened. I removed the JB+ to see if there was still an issue, and it hasn't happened since I removed it. Which was about two weeks ago.

Has anyone encountered this and know what is the cause and fix?

yoon_209 · 05-31-2018, 05:40 PM

If you are referring to the engine having a rough idle and sort of jerkiness when the engine is cold. then yes i have encountered this issue before.

i've noticed that when i give adequate time for the engine to warm and do no step on the throttle aggressively when the engine is cold i do not have this problem.

Kaps335i · 05-31-2018, 05:44 PM

Quote:

Originally Posted by yoon_209

If you are referring to the engine having a rough idle and sort of jerkiness when the engine is cold. then yes i have encountered this issue before.

i've noticed that when i give adequate time for the engine to warm and do no step on the throttle aggressively when the engine is cold i do not have this problem.

No idle issues, and very noticeable when it happens. Not something you can just barely detect. Feels like you are trying to drive a stick for the first time and lugging the engine.

And as I mentioned, I've had the JB+ for about a year, and this just started. Seems odd that it would start all the sudden.

yoon_209 · 05-31-2018, 06:15 PM

Quote:

Originally Posted by Kaps335i

No idle issues, and very noticeable when it happens. Not something you can just barely detect. Feels like you are trying to drive a stick for the first time and lugging the engine.

And as I mentioned, I've had the JB+ for about a year, and this just started. Seems odd that it would start all the sudden.

i would post this on n54tech as the guys at burger can help you more directly regarding the jb+

Kaps335i · 05-31-2018, 06:37 PM

Quote:

Originally Posted by yoon_209

i would post this on n54tech as the guys at burger can help you more directly regarding the jb+

Doesn't seem like I can register. I can't get past the Anti Spam Question "Who is the best BMW tuner?"

yoon_209 · 05-31-2018, 06:40 PM

Quote:

Originally Posted by Kaps335i

Doesn't seem like I can register. I can't get past the Anti Spam Question "Who is the best BMW tuner?"

isnt the answer like bms or burger

Kaps335i · 05-31-2018, 06:45 PM

Quote:

Originally Posted by yoon_209

isnt the answer like bms or burger

I tried all the combinations I could think of. Usually those questions are straightforward and even have the answer in the question.

Mike@N54Tuning.com · 06-01-2018, 06:56 AM

You can use the dial on the JB+ to adjust boost up or down as needed. Beyond that there are no diagnostics and if something was wrong with it you'd get a sensor faulty code or similar.

Mike

Tommy R · 06-03-2018, 03:23 PM

Quote:

Originally Posted by Kaps335i

I tried all the combinations I could think of. Usually those questions are straightforward and even have the answer in the question.

I can't get past this anti-spam question, either. Tried every possible combination I could think of with/without spacers, caps, etc. No dice. Is the internet full? Should I just move on?

Can someone offer words of wisdom here, please?

Mike@N54Tuning.com · 06-04-2018, 08:29 AM

Quote:

Originally Posted by Tommy R

I can't get past this anti-spam question, either. Tried every possible combination I could think of with/without spacers, caps, etc. No dice. Is the internet full? Should I just move on?

Can someone offer words of wisdom here, please?

They change it regularly since spam-bots attack the site often. Current password should be pretty obvious, though. Try "terry".

Mike

Sanko · 06-04-2018, 10:04 AM

I have the same issue. I got back to the BMS guys they advised to gradually move the boost adjust dial from minimum up. Mine starts lugging from 3 o'clock position (I guess it's 1 bar above stock) The issue is that this way no noticeable power gain. BMS sad it's a petrol quality issue not much can be done...

...so I ditched the thing

Tommy R · 06-04-2018, 11:50 AM

Quote:

Originally Posted by Mike@N54Tuning.com

They change it regularly since spam-bots attack the site often. Current password should be pretty obvious, though. Try "terry".

Mike

Thanks, Mike. I was pulling out my hair about this, but a friend fortunately knew. I didn't/don't even know who Terry is, but at least I'm finally registered!

Thanks,
Tommy

Kaps335i · 06-04-2018, 02:52 PM

Quote:

Originally Posted by Tommy R

Thanks, Mike. I was pulling out my hair about this, but a friend fortunately knew. I didn't/don't even know who Terry is, but at least I'm finally registered!

Thanks,
Tommy

Somehow I was able to get in by using Dinan.

AshlandTE87 · 06-06-2018, 03:10 PM

I have been plagued by an issue where the engine will start stumbling around 4k rpm usually in 3rd gear but sometimes in 2nd gear when I'm flooring it from a stop. I took the car in to the dealer last week (JB+ removed) and mentioned the stumbling thinking it was a plug or coil issue. Car has 36k miles and they couldn't recreate it and it showed no codes for a misfire.......and I can't recreate it myself with the JB+ off the car. I've thought that maybe I'm hitting a torque limit value such as has been discussed in the MHD thread to where the engine is programmed to cut boost/throttle in certain gears when certain torque values are reached.

05-31-2018, 05:28 PM	#1
Kaps335i Private First Class 53 Rep 150 Posts Drives: 2013 335i xDrive Join Date: Oct 2016 Location: New Jersey iTrader: (0)	JB+ - Engine Lugging I wouldn't necessarily say the engine is lugging, but that is the best way I can describe it, and it only happens when the JB+ is installed. I've had the JB+ for probably a year now in my 2013 335i xDrive MT that has 36,000 miles. This started happening recently. When the engine is cold and usually between 2-3k RPMs it lugs. At first I thought to myself "did I forget how to drive a stick?" But I made sure the clutch was fully engaged and it still happened. I removed the JB+ to see if there was still an issue, and it hasn't happened since I removed it. Which was about two weeks ago. Has anyone encountered this and know what is the cause and fix?
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05-31-2018, 05:40 PM	#2
yoon_209 Masterchief 362 Rep 1,012 Posts Drives: 20' BMW M340i Join Date: Aug 2016 Location: Irvine, CA iTrader: (1)	If you are referring to the engine having a rough idle and sort of jerkiness when the engine is cold. then yes i have encountered this issue before. i've noticed that when i give adequate time for the engine to warm and do no step on the throttle aggressively when the engine is cold i do not have this problem. __________________ AWE Non-Res Touring \| TE37 SL PW \| Ohlins RT
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06-01-2018, 06:56 AM	#8
Mike@N54Tuning.com BimmerPost Supporting Vendor 4914 Rep 115,980 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	You can use the dial on the JB+ to adjust boost up or down as needed. Beyond that there are no diagnostics and if something was wrong with it you'd get a sensor faulty code or similar. Mike
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06-04-2018, 10:04 AM	#11
Sanko New Member 9 Rep 17 Posts Drives: BMW 428i Gran Coupe Join Date: Dec 2017 Location: Dubai iTrader: (0)	I have the same issue. I got back to the BMS guys they advised to gradually move the boost adjust dial from minimum up. Mine starts lugging from 3 o'clock position (I guess it's 1 bar above stock) The issue is that this way no noticeable power gain. BMS sad it's a petrol quality issue not much can be done... ...so I ditched the thing
	Appreciate 0 Quote

06-06-2018, 03:10 PM	#14
AshlandTE87 Private First Class 20 Rep 99 Posts Drives: 2015 335i M-Sport 6sp Join Date: Nov 2015 Location: Your mom's house iTrader: (0)	I have been plagued by an issue where the engine will start stumbling around 4k rpm usually in 3rd gear but sometimes in 2nd gear when I'm flooring it from a stop. I took the car in to the dealer last week (JB+ removed) and mentioned the stumbling thinking it was a plug or coil issue. Car has 36k miles and they couldn't recreate it and it showed no codes for a misfire.......and I can't recreate it myself with the JB+ off the car. I've thought that maybe I'm hitting a torque limit value such as has been discussed in the MHD thread to where the engine is programmed to cut boost/throttle in certain gears when certain torque values are reached.
	Appreciate 0 Quote