Resonance when up shifting at full acceleration - BMW 3-Series Forum (F30 / F32)

heldraget · 05-21-2013, 03:55 PM

Featured on BIMMERPOST.com

A few days ago my dealer installed the M Perf exhaust on my 328i M Sport F31 AT8. Now there's a loud vibration/resonance when up shifting during full acceleration. I've been in Sport+ and used the paddle shifters in manual mode.

The duration is about half a second and it's very loud/strong.

Is this to be expected? Has anyone else experienced this?

Vitoco · 05-21-2013, 04:01 PM

I'm pretty sure it's meant to be that way, enjoy it

heldraget · 05-21-2013, 04:25 PM

It would be easier to enjoy if I knew it's a feature and not a bug

pokerface · 05-21-2013, 04:37 PM

Take an audio recording.

Joshhleee · 05-21-2013, 08:57 PM

all the new bmw do that, i personally think it sounds nice

stormtrooper328i · 05-21-2013, 09:26 PM

i've got it too with the magnaflow cat-back, and the reverb sound seems to kick in when a shift occurs from 4000rpm or above. definitely agree with the others here that the sound is bad ass...

canbmw · 05-21-2013, 10:54 PM

Maybe a heat shield that has come loose or something related to the installation??

momo3605 · 05-21-2013, 11:10 PM

I have the same thing on mine, I think it's normal. Check out a video of the F10 M5 shifting, it does the same thing.

Vitoco · 05-22-2013, 04:13 AM

I got the stock exhaust and hear it when im shifting in D/S, kinda goes hand in hand with the shift-kick you get when accelerating fast and shifting. And with the pano-roof open, its sounds even better

unfortunately I haven´t had the time to get the M-Perf exhaust yet.

heldraget · 05-22-2013, 07:05 AM

Thanks all, good to hear it's working as supposed!

Funny that I never noticed it with the stock exhaust.

05-21-2013, 03:55 PM	#1
heldraget New Member Drives: BMW 328iAT F31 Mineral Gray Join Date: Nov 2012 Location: Sweden Posts: 7 iTrader: (0)	Resonance when up shifting at full acceleration Featured on BIMMERPOST.com A few days ago my dealer installed the M Perf exhaust on my 328i M Sport F31 AT8. Now there's a loud vibration/resonance when up shifting during full acceleration. I've been in Sport+ and used the paddle shifters in manual mode. The duration is about half a second and it's very loud/strong. Is this to be expected? Has anyone else experienced this?
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05-21-2013, 04:01 PM	#2
Vitoco Second Lieutenant Drives: F31 328i M Sport Join Date: Mar 2012 Location: Sweden Posts: 254 iTrader: (0)	I'm pretty sure it's meant to be that way, enjoy it __________________ Glacier Ag. F31 328iA M Sport oct. 2012 \| Sport Automatic \| Adap. M Susp. \| Pano. Moonroof \| 19" 403 M \| M Sport brakes \| Harman Kardon \| Elec. Seats \| PDC F&R \| Park Assist \| ACC Stop&Go \| Perf. Parts \|

05-21-2013, 04:37 PM	#4
pokerface Major Drives: B8 A4 2.0T Join Date: Apr 2006 Location: Toronto Posts: 1,414 iTrader: (1)	Take an audio recording. __________________ F25 X3 N20: 2010 B8 A4 2.0T quattro (current)/ 2013 F25 X3 x28 N20 (babymobile)

05-22-2013, 04:13 AM	#9
Vitoco Second Lieutenant Drives: F31 328i M Sport Join Date: Mar 2012 Location: Sweden Posts: 254 iTrader: (0)	I got the stock exhaust and hear it when im shifting in D/S, kinda goes hand in hand with the shift-kick you get when accelerating fast and shifting. And with the pano-roof open, its sounds even better unfortunately I haven´t had the time to get the M-Perf exhaust yet. __________________ Glacier Ag. F31 328iA M Sport oct. 2012 \| Sport Automatic \| Adap. M Susp. \| Pano. Moonroof \| 19" 403 M \| M Sport brakes \| Harman Kardon \| Elec. Seats \| PDC F&R \| Park Assist \| ACC Stop&Go \| Perf. Parts \|

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05-21-2013, 04:25 PM	#3
heldraget New Member Drives: BMW 328iAT F31 Mineral Gray Join Date: Nov 2012 Location: Sweden Posts: 7 iTrader: (0)	It would be easier to enjoy if I knew it's a feature and not a bug

05-21-2013, 08:57 PM	#5
Joshhleee Second Lieutenant Drives: F30 328 jet black/coral sport Join Date: Oct 2012 Location: Socal Posts: 207 iTrader: (0)	all the new bmw do that, i personally think it sounds nice

05-21-2013, 09:26 PM	#6
stormtrooper328i Enlisted Member Drives: F30 328i M Sport Join Date: Jan 2013 Location: Raleigh-Durham, NC Posts: 43 iTrader: (1)	i've got it too with the magnaflow cat-back, and the reverb sound seems to kick in when a shift occurs from 4000rpm or above. definitely agree with the others here that the sound is bad ass...

05-21-2013, 10:54 PM	#7
canbmw Private Drives: none Join Date: Feb 2013 Location: Canada Posts: 69 iTrader: (0)	Maybe a heat shield that has come loose or something related to the installation??

05-21-2013, 11:10 PM	#8
momo3605 Private First Class Drives: 328i M Sport Join Date: Aug 2012 Location: Norcal Posts: 192 iTrader: (0)	I have the same thing on mine, I think it's normal. Check out a video of the F10 M5 shifting, it does the same thing.

05-22-2013, 07:05 AM	#10
heldraget New Member Drives: BMW 328iAT F31 Mineral Gray Join Date: Nov 2012 Location: Sweden Posts: 7 iTrader: (0)	Thanks all, good to hear it's working as supposed! Funny that I never noticed it with the stock exhaust.