BCS Powervalve M135I rattle

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Tazz
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BCS Powervalve M135I rattle

Post by Tazz » Sun Mar 25, 2018 8:19 pm

I bought a BMW M135I with BCS powervalve exhaust system already fitted in.

There seems to be a rattle in the rear pipe on the right (the one connected to boost actuator).. If I put something to keep the flap inside the pipe the rattle goes.. Any advice ??

Thank you

mick.86uk
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Location: Lancashire

Re: BCS Powervalve M135I rattle

Post by mick.86uk » Sat Apr 07, 2018 6:35 pm

I've just fitted a BCS Sports Cat & a used cat back power valve system.

On first start up while still on the ramp to check for leaks & rattles, it all seemed fine.

I did a cold start this morning & there is a rattle noise similar to the standard backbox rattle, if I blip or hold a small amount of throttle it disappears.

I'll take a closer look tomorrow and see if its coming from the butterfly valve.

Anyone else had this issue on their BCS exhaust system?
2014 F20 M135i - Manual - Glacier Silver - Pro Nav - HK Audio - Drexler LSD - BBS CH-Rs - JB4 MHD BEF - BCS Cat - BCS Powervalve - M4 LCAs - Bilstein B14s - aFe Drop In & Scoop
Gone:
2009 E92 335i M Sport
2004 E46 M3
2005 E87 130i M Sport

JoeperkinS
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Re: BCS Powervalve M135I rattle

Post by JoeperkinS » Tue Jun 26, 2018 10:17 pm

Did you get to the bottom of this?

Ronburgundy1983
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Re: BCS Powervalve M135I rattle

Post by Ronburgundy1983 » Wed Jun 27, 2018 7:34 am

I think my bcs has started to rattle too! Need to investigate a little more but sound as if it was coming from the valve side also

mick.86uk
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Re: BCS Powervalve M135I rattle

Post by mick.86uk » Fri Jun 29, 2018 9:29 pm

JoeperkinS wrote:
Tue Jun 26, 2018 10:17 pm
Did you get to the bottom of this?
Once I flashed the MHD cold start noise reduction option the loud exhaust rattle disappeared all together! :thumbs:

Expensive fix but a good excuse to start running the MHD maps....
2014 F20 M135i - Manual - Glacier Silver - Pro Nav - HK Audio - Drexler LSD - BBS CH-Rs - JB4 MHD BEF - BCS Cat - BCS Powervalve - M4 LCAs - Bilstein B14s - aFe Drop In & Scoop
Gone:
2009 E92 335i M Sport
2004 E46 M3
2005 E87 130i M Sport

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