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  #1  
Old 02-22-2015, 01:37 AM
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dual exhaust not working right?

2013 3.5 M-Sport noticed that exhaust comes out only out of the driver side, asked dealer and was told it switches to both after either specific RPM or after certain TEMP both of which kind of didnt make sense. well had a 5 hr drive and the passenger side had nothing coming out of it. any ideas?
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  #2  
Old 02-22-2015, 01:40 AM
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It is RPM related and has an actuator valve that controls it. There was a factory upgrade that allows both exhaust tips to be used though; it was the 50i option or the X5 M.

Your actuator could be malfunctioning though.

Golf Tee Mod on 2011 no longer works the same way!
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Old 02-22-2015, 01:45 AM
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Quote:
Originally Posted by lanbrown View Post

Your actuator could be malfunctioning though.

Golf Tee Mod on 2011 no longer works the same way!
lovely not even 20k on it

thanks for the info though
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  #4  
Old 02-22-2015, 01:29 PM
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above roughly 3000rpms it opens or at WOT
you may even be able to hear the difference.
maybe tape a piece of paper over it and go for a quick drive, if the tape popped off then it must have opened
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  #5  
Old 02-25-2015, 11:36 AM
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get a metal zip tie and it will hold it open for a little better sound! i did it to mine with 30miles on it now i have 30K no issues at all
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  #6  
Old 02-25-2015, 07:35 PM
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Hello,

I know there has been allot of discussion around this, everything from fuel mileage to HP & TQ differences.

What has been your overall expirence in having the passengers side zip-tied open? I've been thinking of doing the same to mine since I had my 2011 X5, but couldn't get through all the Pro's & Con's around it to make a decision.

-Thanks

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Originally Posted by Chio View Post
get a metal zip tie and it will hold it open for a little better sound! i did it to mine with 30miles on it now i have 30K no issues at all
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  #7  
Old 02-26-2015, 05:58 PM
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not one negative IMO! sound little better drives and sounds fine on city roads and highways!
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Old 02-26-2015, 07:19 PM
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Thanks for the feedback.

I've done a number of searches on this and seen everything from what you have posted (30K miles with zero issues) to people saying that it caused Turbo failures on their 3 Series cars.

My thinking around it is that I can't see how it would possibly harm anything for the following reasons:

1) The exhaust is not being removed, just the other 50% is free flowing and opens under full throttle or above 3K RPM's.
2) BMW performance replacement exhausts are replacing the factory exhaust with even less back pressure.
3) I could be wrong, but I don't think Turbo engines require this much back pressure.
4) The back pressure isn't going away, it's just being equalized across both sides as when it's above 3K RPM's or Full Throttle.
5) Other BMW's with the same engine, such as the 535xi I used to have, had both exhausts open, no flap at all.

Personally I think the exhaust flap is there for noise only purposes for the soccer moms that are just driving to the store etc...

I'd actually like to see if anyone has ever done a dyno with this mod.

I also think that it might (while ever so slight) provide a little better fuel economy.

Thoughts...?
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  #9  
Old 02-26-2015, 10:49 PM
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I agree it is only for noise ! the m performance exhaust does not have the flap if i can recall! I also have the dinan tune and my car has been pretty solid!
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Old 05-03-2015, 09:22 PM
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hey so a friend of mine picked up a 2012 50i and his both sides work. so is this due to different engine or as someone said above a factory upgrade to allow both sides? dealer is insisting after supposedly checking that this is normal on my 35i for the passenger pipe not to work constantly.
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