Tune install, now Transfer case problem?

CDNBimmer · 09-03-2018, 04:04 PM

Hello, I recently did a stage 1 tune to my 13 535XI and instantly noticed under hard acceleration (typically) at hwy speeds that the car stutters or that the car is simply not accelerating smoothly.

I never noticed any of this prior to the tune.

It's not always easy to repeat or consistent.

For those that have experienced similar would you guess spark plugs or as my mechanic noted he's seen a few lately with failing transfer cases.

Perhaps best to remove the tune??

Stück · 09-03-2018, 05:16 PM

What tune, what supporting mods, how old are your plugs? What plugs? Gapped to what? What fuel?

No mind readers here.

CDNBimmer · 09-03-2018, 05:25 PM

Quote:

Originally Posted by Stück

What tune, what supporting mods, how old are your plugs? What plugs? Gapped to what? What fuel?

No mind readers here.

Quote:

Originally Posted by Stück

What tune, what supporting mods, how old are your plugs? What plugs? Gapped to what? What fuel?

No mind readers here.

Fair point. Plugs are original (60,000kms) but look ok. Gapping I'm not totally sure. Running 91 fuel with no other mods. The car has been stock it's entire life.

bradsm87 · 09-03-2018, 06:08 PM

Sounds like spark plugs need to be gapped down. Common when increasing boost.

CDNBimmer · 09-03-2018, 06:51 PM

Quote:

Originally Posted by bradsm87

Sounds like spark plugs need to be gapped down. Common when increasing boost.

What would you suggest they be gapped to?

Stück · 09-03-2018, 07:31 PM

Wwwwwhhhhaaaaattttttt Tttt00000000n

bradsm87 · 09-03-2018, 08:01 PM

Quote:

Originally Posted by CDNBimmer

What would you suggest they be gapped to?

0.024" is a good starting point. If they're already at that, go less.

CDNBimmer · 09-03-2018, 11:08 PM

Quote:

Originally Posted by Stück

Wwwwwhhhhaaaaattttttt Tttt00000000n

Sorry, the tune is from these guys. I don't know much more about it.

http://www.ecuprogram.com/bmw

BMW Engine N55
ECU: Bosch MEVD17.2.x
Tuning Process: OBD
Stage 1: Up to 380 HP / 380 TQ

AZ_Bmw_550 · 09-04-2018, 10:20 AM

I had this issue, (or at least it sounds similar), on a tuned 650. Went to a colder plug, (M5/M6 plug) and gapped them down to .024 as mentioned above. This got rid of the acceleration stumble for me. Most say it's overkill to go to a colder plug on just a tune, but I live in a high heat environment so I wanted to hedge my bet a little.

CDNBimmer · 09-04-2018, 01:09 PM

Quote:

Originally Posted by AZ_Bmw_550

I had this issue, (or at least it sounds similar), on a tuned 650. Went to a colder plug, (M5/M6 plug) and gapped them down to .024 as mentioned above. This got rid of the acceleration stumble for me. Most say it's overkill to go to a colder plug on just a tune, but I live in a high heat environment so I wanted to hedge my bet a little.

I'm going to go ahead with plugs since that seems like the most common fix. Thanks for the feedback.

CDNBimmer · 09-22-2018, 11:13 AM

I resolved my issue. For anyone else that experiences the same symptoms I did the plugs (which didn't completely fix) then had the tuner change the throttle response or accelerator sensitivity.

Most tuners amp up the sensitivity of the accelerator but I think in my case it was so sensitive that slight variations to the peddle made the car jerky. What was slight before could have been the equivalent far more coming on and off (ie. in a merging scenario where you don't just put the pedal down and leave it there).

Now that I'm back to stock (peddle settings) I have no symptoms.

09-03-2018, 04:04 PM	#1
CDNBimmer Second Lieutenant 17 Rep 265 Posts Drives: 07 BMW 335i & 09 BMW 128i Join Date: Feb 2013 Location: Canada iTrader: (0)	Tune install, now Transfer case problem? Hello, I recently did a stage 1 tune to my 13 535XI and instantly noticed under hard acceleration (typically) at hwy speeds that the car stutters or that the car is simply not accelerating smoothly. I never noticed any of this prior to the tune. It's not always easy to repeat or consistent. For those that have experienced similar would you guess spark plugs or as my mechanic noted he's seen a few lately with failing transfer cases. Perhaps best to remove the tune??
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09-03-2018, 05:16 PM	#2
Stück Major 801 Rep 1,214 Posts Drives: F15 X5, E46 330i, R56 Mini.S Join Date: May 2016 Location: Houston, TX iTrader: (4)	What tune, what supporting mods, how old are your plugs? What plugs? Gapped to what? What fuel? No mind readers here.
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09-03-2018, 06:08 PM	#4
bradsm87 Lieutenant Colonel 596 Rep 1,693 Posts Drives: F25 LCI xDrive30d Join Date: Jun 2013 Location: Australia iTrader: (0)	Sounds like spark plugs need to be gapped down. Common when increasing boost.
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09-03-2018, 07:31 PM	#6
Stück Major 801 Rep 1,214 Posts Drives: F15 X5, E46 330i, R56 Mini.S Join Date: May 2016 Location: Houston, TX iTrader: (4)	Wwwwwhhhhaaaaattttttt Tttt00000000n
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09-04-2018, 10:20 AM	#9
AZ_Bmw_550 Private First Class 52 Rep 182 Posts Drives: 2015 BMW 650i GC Join Date: Feb 2015 Location: United States iTrader: (0) Garage List 2011 BMW 550i [0.00]	I had this issue, (or at least it sounds similar), on a tuned 650. Went to a colder plug, (M5/M6 plug) and gapped them down to .024 as mentioned above. This got rid of the acceleration stumble for me. Most say it's overkill to go to a colder plug on just a tune, but I live in a high heat environment so I wanted to hedge my bet a little.
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09-22-2018, 11:13 AM	#11
CDNBimmer Second Lieutenant 17 Rep 265 Posts Drives: 07 BMW 335i & 09 BMW 128i Join Date: Feb 2013 Location: Canada iTrader: (0)	I resolved my issue. For anyone else that experiences the same symptoms I did the plugs (which didn't completely fix) then had the tuner change the throttle response or accelerator sensitivity. Most tuners amp up the sensitivity of the accelerator but I think in my case it was so sensitive that slight variations to the peddle made the car jerky. What was slight before could have been the equivalent far more coming on and off (ie. in a merging scenario where you don't just put the pedal down and leave it there). Now that I'm back to stock (peddle settings) I have no symptoms.
	Appreciate 0 Quote