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#1
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dual exhaust not working right?
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#2
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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! |
#3
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Quote:
thanks for the info though |
#4
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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 |
#5
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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
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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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2015 BMW 650IX M SPORT 2013 BMW X5 PREMIUM 2013 FORD SVT RAPTOR |
#7
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not one negative IMO! sound little better drives and sounds fine on city roads and highways!
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#8
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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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2015 BMW 650IX M SPORT 2013 BMW X5 PREMIUM 2013 FORD SVT RAPTOR |
#9
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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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#10
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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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