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E70 X5 M / E71 X6 M
Forum for the all-wheel-drive models BMW X5 M and BMW X6 M.

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  #1  
Old 03-27-2013, 10:12 AM
WineCountry WineCountry is offline
Cameron
Location: San Francisco, CA
 
Join Date: Aug 2011
Posts: 99
Mein Auto: 135i Coupe
Exhaust Valve Opening

I've done some searching about the "butterfly" style exhaust valve on 2 of the 4 tailpipes on the X5M, and mostly seen some questions/answers on other model forums. Nobody seems to know for sure what causes these valves open up. Sorry for my ignorance- I mostly am just curious. At standstill (in all drive modes) they seem closed, so barring a test where I place a camera staring straight into the exhaust and drive off, does anybody actually know exactly what sets these valves off? I assume either heavy throttle load out of necessity or a certain RPM point? Sounds like some people with other models have been able to disconnect it and permanantly open it up for noise reasons?
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2013 X5M
2009 135i Coupe
2012 550i
2008 650i Convertible- Sold
2007 550i- Sold
2006 750i- Sold
2004 545i- Returned/Lemon Law
2001 330ci- Sold
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  #2  
Old 03-27-2013, 10:56 AM
dkreidel's Avatar
dkreidel dkreidel is offline
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Location: OC CA + Bear Country Montana
 
Join Date: Aug 2005
Posts: 1,838
Mein Auto: BMWs
The valve is open in the M power mode all the time after warm-up. In non-M it seems to be regulated by manifold pressure/vacuum. My M3 was a pneumatic/vacuum valve but I haven't crawled under the X5M to see if the valve is electric or vacuum.

Are you the same Wine Country who posts on the UA forum in FT?
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'13 X5M - carbon black over black • BBS SV "it's our truck"
'13 X5 35i - alpine white over black • X5M wheels & tires "it's our car"
'11 Z4 - mojave over beige • 6 speed manual • Münich delivery

...and a bunch of old English motorcycles
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  #3  
Old 04-07-2013, 11:19 AM
WineCountry WineCountry is offline
Cameron
Location: San Francisco, CA
 
Join Date: Aug 2011
Posts: 99
Mein Auto: 135i Coupe
Thanks for the info! And no, I don't think thats me
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2013 X5M
2009 135i Coupe
2012 550i
2008 650i Convertible- Sold
2007 550i- Sold
2006 750i- Sold
2004 545i- Returned/Lemon Law
2001 330ci- Sold
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