535d Exhaust
07-10-2005, 10:32 AM
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My Ride: BMW, 535d
Hallo!
Does somebody have any information about flap in exhaust of BMW 535d? How is it working? It is seen that flap is opening/closing during the driving. Why is this flap there anyway? Thank you for INFO.
Best regards from Slovenia,
Klemen
Does somebody have any information about flap in exhaust of BMW 535d? How is it working? It is seen that flap is opening/closing during the driving. Why is this flap there anyway? Thank you for INFO.
Best regards from Slovenia,
Klemen
07-10-2005, 12:08 PM
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My Ride: Current - 330 Sport Topaz Blue, Grey Leather, HK HIFI...lost interest!!
Waiting for - 535d Sport, Silver Grey, Foldy Mirrors, 172 19",Logic7,Pro Radio,Through load,Heated Front Seats,High Gloss shadowline,Black Maple,Headlight wash,Sun Protection Glass.
It is the same as the flap on my 330iS. At lower revs it is shout to keep noise down when you drive hard the flap opens to let the exhaust escape quicker and typically the noise doesnt matter becuase your on a road away from built up areas. It is needed to comply with legislation. If you want a sportier sound, you can disconnect the vaccum pipe (plug it with a golf tee) and the flap stays open all of the time...did theis on my 330 sounds great didnt see any improvement or degradation of performance however 
07-10-2005, 01:45 PM
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I was following my wife driving my car the other day and thought I saw a flap in the exhaust but paid no attention. Your post just reminded me. Thanks for the info. Better get rid of car before exhaust needs replacing as that looks well cheap, NOT. 
07-10-2005, 01:52 PM
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My Ride: 545iSMGSilver GrayAuburn Dakota LeatherLogic 7 Premium SoundSports Package
Its on the 545 exhaust too not sure about the 525 and 530 but I think I remember reading some said it wasnt a good idea to keep it open all the time... I forget why. Maybe I'll do a search later and find out.
07-10-2005, 02:27 PM
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My Ride: 545i Mystic Blue/Black Leather Type 124 Wheels
The valve works with the engine inlet vacuume on older engines, and through a vacuume pump on the newer 6 cylinder engines
It closes at low engine speed to reduce noise, thats all it does
Its a very simple little device, and if you put a different exhaust on you just remove the vacuume line and plug it ( teh oem sport exhaust for the E46 makes you do that )
It closes at low engine speed to reduce noise, thats all it does
Its a very simple little device, and if you put a different exhaust on you just remove the vacuume line and plug it ( teh oem sport exhaust for the E46 makes you do that )
07-13-2005, 04:24 AM
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My Ride: 535 D - to be delivered end Feb 2005 - color E08 - comfort seats - executive leather balck - 122 wheels - dynamic drive - active steering - pack luxe - tecnology pack - moon roof - 6CD player - hifi system - spare wheel - BT phone
Is it normal that it makes a "cling" noise when it opens or closes?
07-13-2005, 02:02 PM
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My wife moved my car earlier and I took a quick look at the exhaust flap. On start up I noticed the flap stayed open on tickover and during a gentle reverse at low revs. I thought it was supposed to be closed at low revs! Is mine not working correctly? 
07-19-2005, 07:18 AM
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Originally Posted by Merv the Derv' date='Jul 13 2005, 11:02 PM
My wife moved my car earlier and I took a quick look at the exhaust flap. On start up I noticed the flap stayed open on tickover and during a gentle reverse at low revs. I thought it was supposed to be closed at low revs! Is mine not working correctly?
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But that's why I can't still understand its function.
I saw yesterday an 535d on an highway, I was behind it and i saw that when the car accelerated the valve closed and the opposite happened in braking or spped lowering conditions...
I studied engines for years but i can't give an exact explication about it. It seems the web don't knows about it!
Bye bye
