After catless downpipes installation

zjaiz · 08-13-2018, 11:25 AM

Hi guys, been searching in the forum for answers/info regarding about the rattling noise during low rpms which is also known as the waste gate rattle/flutter. The sound is muffled by the cat coverter but got the catless installed so i can hear it more which m not used to it! Loved the added hp and the sound of the turbo on high rpms but annoys me a bit if driving slow..tried setting it to sport and its still there.. any inputs is highly appreciated!

RaVe · 08-13-2018, 01:13 PM

No Chance..i spend a lot of Time in discussion with m Group and i had a turbocharger change but it is still there...They Coded the Engine but Again no Better result..i hope there is a Solution but i do Not Know anybody??

zjaiz · 08-13-2018, 01:16 PM

Quote:

Originally Posted by RaVe

No Chance..i spend a lot of Time in discussion with m Group and i had a turbocharger change but it is still there...They Coded the Engine but Again no Better result..i hope there is a Solution but i do Not Know anybody??

Guess if you have a valved exhaust then you can lessen the noise.. i do have the eisenmann race thats maybe its loud...

:

RaVe · 08-13-2018, 01:39 PM

I have an akrapovic exhaust and sport cats ... the rattling annoys me too ... the overall impression of the engine noise is disturbed, because it does not sound clean

RaVe · 08-13-2018, 01:44 PM

I do not know if maybe other turbos help by pure turbos or if the original turbos are reworked with stage 2

zjaiz · 08-13-2018, 01:54 PM

Quote:

Originally Posted by RaVe

I have an akrapovic exhaust and sport cats ... the rattling annoys me too ... the overall impression of the engine noise is disturbed, because it does not sound clean

Yes it sounds raw ... saw the post from the m5 and m6 forum. One suggested to get used to it since all of them have this issue..

RaVe · 08-13-2018, 02:22 PM

the problem does not happen often enough and many do not hear it in the normal state .. the effect can also be heard later ... bmw knows the topic but can live with it ... Engines do that Noise 😝 its only a Noise ... no Otter Problems

zjaiz · 08-20-2018, 01:04 PM

Found out that the installation for my catback exhaust wasnt done properly.. and its leaking.. no waste gate noise..

r33_RGSport · 08-20-2018, 02:32 PM

Quote:

Originally Posted by zjaiz

Found out that the installation for my catback exhaust wasnt done properly.. and its leaking.. no waste gate noise..

Wow, that's good news.
Funny that the car didn't give you any error with that leakage.
I suspect, the leakage should be from the top part where it connect to the turbo itself, right?

zjaiz · 08-20-2018, 02:42 PM

Quote:

Originally Posted by r33_RGSport

Quote:

Originally Posted by zjaiz

Found out that the installation for my catback exhaust wasnt done properly.. and its leaking.. no waste gate noise..

Wow, that's good news.
Funny that the car didn't give you any error with that leakage.
I suspect, the leakage should be from the top part where it connect to the turbo itself, right?

Its actually where the stock pipes and the eisenmann connects, plus the clamps r not secured.. they showed me my under carriage and literally he can moved it with his hands..

r33_RGSport · 08-20-2018, 10:31 PM

Quote:

Originally Posted by zjaiz

Its actually where the stock pipes and the eisenmann connects, plus the clamps r not secured.. they showed me my under carriage and literally he can moved it with his hands..

That explains it.
I guess whoever install it, loosen up the muffler to get some wiggle room to take out the downpipe and forgot to re-tighten that back end.

08-13-2018, 11:25 AM	#1
zjaiz Private First Class 180 Rep 140 Posts Drives: F95 X5MComp Join Date: Aug 2017 Location: queens nyc iTrader: (1)	After catless downpipes installation Hi guys, been searching in the forum for answers/info regarding about the rattling noise during low rpms which is also known as the waste gate rattle/flutter. The sound is muffled by the cat coverter but got the catless installed so i can hear it more which m not used to it! Loved the added hp and the sound of the turbo on high rpms but annoys me a bit if driving slow..tried setting it to sport and its still there.. any inputs is highly appreciated!
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08-13-2018, 01:13 PM	#2
RaVe Private 80 Rep 96 Posts Drives: X5M F85 Join Date: Jan 2016 Location: West Germany iTrader: (0)	No Chance..i spend a lot of Time in discussion with m Group and i had a turbocharger change but it is still there...They Coded the Engine but Again no Better result..i hope there is a Solution but i do Not Know anybody??
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08-13-2018, 01:39 PM	#4
RaVe Private 80 Rep 96 Posts Drives: X5M F85 Join Date: Jan 2016 Location: West Germany iTrader: (0)	I have an akrapovic exhaust and sport cats ... the rattling annoys me too ... the overall impression of the engine noise is disturbed, because it does not sound clean
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08-13-2018, 01:44 PM	#5
RaVe Private 80 Rep 96 Posts Drives: X5M F85 Join Date: Jan 2016 Location: West Germany iTrader: (0)	I do not know if maybe other turbos help by pure turbos or if the original turbos are reworked with stage 2
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08-13-2018, 02:22 PM	#7
RaVe Private 80 Rep 96 Posts Drives: X5M F85 Join Date: Jan 2016 Location: West Germany iTrader: (0)	the problem does not happen often enough and many do not hear it in the normal state .. the effect can also be heard later ... bmw knows the topic but can live with it ... Engines do that Noise 😝 its only a Noise ... no Otter Problems
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After catless downpipes installation

08-20-2018, 01:04 PM	#8
zjaiz Private First Class 180 Rep 140 Posts Drives: F95 X5MComp Join Date: Aug 2017 Location: queens nyc iTrader: (1)	Found out that the installation for my catback exhaust wasnt done properly.. and its leaking.. no waste gate noise..
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