Diff "rumble" seems to be solved by GTS diff coding

viva_brasil · 09-13-2018, 06:37 PM

My F80 had a "rumble" / low frequency vibration coming from the differential under heavy load, low-rpm. Could be perceived more in 4th gear and above.

My 335i with aftermarket LSD actually did the same thing (including the 1st gear clunk - both cars are 6MT). I remember the LSD manufacturer saying it had to do with an adjustment of the differential, and was "normal" NVH given the amount of torque...

I recently had the GTS differential coding performed, and now it is completely gone and smooth.

I've seen a few complaints about this - and was actually planning to take it into the dealer (and expecting them to say it's normal). So wanted to post this up in case someone else is searching for diff vibration or noise.

Poiseuille · 09-13-2018, 06:44 PM

Quote:

Originally Posted by viva_brasil

My F80 had a "rumble" / low frequency vibration coming from the differential under heavy load, low-rpm. Could be perceived more in 4th gear and above.

My 335i with aftermarket LSD actually did the same thing (including the 1st gear clunk - both cars are 6MT). I remember the LSD manufacturer saying it had to do with an adjustment of the differential, and was "normal" NVH given the amount of torque...

I recently had the GTS differential coding performed, and now it is completely gone and smooth.

I've seen a few complaints about this - and was actually planning to take it into the dealer (and expecting them to say it's normal). So wanted to post this up in case someone else is searching for diff vibration or noise.

subscribed to see what others have to say about this, thanks for posting OP.

Edit: sorry about quoting the op, hit the wrong tab

Poochie · 09-13-2018, 10:03 PM

It could be that the vehicle uses the rear brakes and E-Diff to modulate the power distribution. It's part of the DSC/MDM system which sounds like a bag of rocks moving about, when active.

By coding the GTS DSC mapping, it being more liberal; allows for more slippage, thus reducing the rumbling sensation you're used to feeling with the standard Diff coding.

RoundelM3 · 09-15-2018, 08:12 AM

How/where can you get this coding done for the diff?

Poochie · 09-15-2018, 09:18 AM

Quote:

Originally Posted by RoundelM3

How/where can you get this coding done for the diff?

In the [COLOR="Navy"]DSC Module[/COLOR]:

[COLOR="DarkRed"]C_Laenderkennung [/COLOR]
set to: [COLOR="Green"]ECE[/COLOR]

Not available in BimmerCode. Maybe E-Sys. Or try one if the remote coders in the classified section.

EricSMG · 09-15-2018, 11:30 PM

My car makes this same noise. But it does it going straight which means diff is not really engaged, so, I can't see diff software resolving this.

Note that all of my E46 M3s did the same thing but to a lesser degree.

Interesting, though.

RoundelM3 · 09-16-2018, 02:11 PM

Quote:

Originally Posted by Poochie

In the ]DSC Module C_Laenderkennung set to: ECE

Not available in BimmerCode. Maybe E-Sys. Or try one if the remote coders in the classified section.

Thanks. I don't remember seeing the DSC module in Carly for BMW, either. I'll see what I can find in E-Sys.

HZX540e · 09-16-2018, 04:53 PM

Quote:

Originally Posted by Poochie

Quote:

Originally Posted by RoundelM3

How/where can you get this coding done for the diff?

In the [COLOR="Navy"]DSC Module[/COLOR]:

[COLOR="DarkRed"]C_Laenderkennung [/COLOR]
set to: [COLOR="Green"]ECE[/COLOR]

Not available in BimmerCode. Maybe E-Sys. Or try one if the remote coders in the classified section.

That simple? Seriously?

Poochie · 09-16-2018, 05:05 PM

Quote:

Originally Posted by HZX540e

Quote:

Originally Posted by Poochie

Quote:

Originally Posted by RoundelM3

How/where can you get this coding done for the diff?

In the DSC Module:

C_Laenderkennung
set to: ECE

Not available in BimmerCode. Maybe E-Sys. Or try one if the remote coders in the classified section.

That simple? Seriously?

There are other perimeters that could be changed also to match the EURO F80/82 settings, such as eliminating the the US restrictive TPMS sensor's heat threshold but to alter just the slip angles and not mess with any other settings, that's what C_Laenderkennung is for.

With anything to do with DSC system, I try to discourage people from interfering with such an intricate system. This is not some minor feature that's implemented just for convenience but could mean life or death, if I could be so dramatical.

MDM euro Coding https://f80.bimmerpost.com/forums/sh....php?t=1061243

viva_brasil · 11-06-2018, 02:53 PM

Alex@Alpine MSS did the GTS coding for me.

RoundelM3 · 11-06-2018, 03:24 PM

I had Alex from Alpine do my diff and DCT coding - really happy with the results.

09-13-2018, 06:37 PM	#1
viva_brasil Enlisted Member 15 Rep 46 Posts Drives: F80 30 Jahre 6MT Join Date: Nov 2015 Location: Bay Area iTrader: (0)	Diff "rumble" seems to be solved by GTS diff coding My F80 had a "rumble" / low frequency vibration coming from the differential under heavy load, low-rpm. Could be perceived more in 4th gear and above. My 335i with aftermarket LSD actually did the same thing (including the 1st gear clunk - both cars are 6MT). I remember the LSD manufacturer saying it had to do with an adjustment of the differential, and was "normal" NVH given the amount of torque... I recently had the GTS differential coding performed, and now it is completely gone and smooth. I've seen a few complaints about this - and was actually planning to take it into the dealer (and expecting them to say it's normal). So wanted to post this up in case someone else is searching for diff vibration or noise. __________________ 30 Jahre Manual
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09-13-2018, 10:03 PM	#3
Poochie Luxury at the redline :) 9103 Rep 7,563 Posts Drives: 2016 M2 Join Date: Aug 2012 Location: NYC iTrader: (3)	It could be that the vehicle uses the rear brakes and E-Diff to modulate the power distribution. It's part of the DSC/MDM system which sounds like a bag of rocks moving about, when active. By coding the GTS DSC mapping, it being more liberal; allows for more slippage, thus reducing the rumbling sensation you're used to feeling with the standard Diff coding.
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09-15-2018, 08:12 AM	#4
RoundelM3 Major General 1830 Rep 6,985 Posts Drives: 15 F80 M3, 22 G01 X3 30i Join Date: Apr 2010 Location: Wendell, NC iTrader: (2) Garage List 2022 BMW X3 [9.83] 2015 BMW M3 [6.50]	How/where can you get this coding done for the diff? __________________ 2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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09-15-2018, 11:30 PM	#6
EricSMG Captain 574 Rep 829 Posts Drives: E46 M3 Join Date: Mar 2016 Location: San Diego iTrader: (0)	My car makes this same noise. But it does it going straight which means diff is not really engaged, so, I can't see diff software resolving this. Note that all of my E46 M3s did the same thing but to a lesser degree. Interesting, though.
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11-06-2018, 02:53 PM	#10
viva_brasil Enlisted Member 15 Rep 46 Posts Drives: F80 30 Jahre 6MT Join Date: Nov 2015 Location: Bay Area iTrader: (0)	Alex@Alpine MSS did the GTS coding for me. __________________ 30 Jahre Manual
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11-06-2018, 03:24 PM	#11
RoundelM3 Major General 1830 Rep 6,985 Posts Drives: 15 F80 M3, 22 G01 X3 30i Join Date: Apr 2010 Location: Wendell, NC iTrader: (2) Garage List 2022 BMW X3 [9.83] 2015 BMW M3 [6.50]	I had Alex from Alpine do my diff and DCT coding - really happy with the results. __________________ 2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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