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      03-01-2006, 05:06 PM   #1
rossmelvin
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whats this?

took these near the tailpipe
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      03-01-2006, 05:21 PM   #2
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Opens the 2nd exhaust port at higher engine RPM for better breathing.
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      03-01-2006, 05:25 PM   #3
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but mine is open all the time? what about the first pic?
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      03-01-2006, 06:52 PM   #4
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first picture is the bumper stop for the exhaust i guess.
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      03-01-2006, 07:26 PM   #5
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Quote:
Originally Posted by rossmelvin
took these near the tailpipe

The second pictures is the valve which operates similar to a wastegate, vaccum/pressure driven to open at a certain point. This allows it to have backpressure when needed and have more flow when it is needed.


The second pic I have no idea about. Can you take a less zoomed in picture to give it some more perspective?
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      03-01-2006, 08:10 PM   #6
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the valve will close when the car is cold to help aid the engine get warmer faster.
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      03-01-2006, 08:18 PM   #7
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Quote:
Originally Posted by hotsand5
the valve will close when the car is cold to help aid the engine get warmer faster.
I'm pretty sure its pressure and not temperature regulated.
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      03-01-2006, 08:32 PM   #8
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more pics of first one (thats the driver's side rear wheel)
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      03-01-2006, 08:59 PM   #9
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pressure regulated flap yes, but I still believe that it is used for the warming of the engine and exhaust gasses (creates lower emissions) and is controlled by the engine temp.
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      03-01-2006, 09:55 PM   #10
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      03-01-2006, 10:01 PM   #11
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the first picture is a vibration absorber (32Hz) as per info from E90fleet.

see link below...

http://www.e90post.com/forums/showthread.php?t=5909
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      03-01-2006, 11:14 PM   #12
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Quote:
Originally Posted by btc
the first picture is a vibration absorber (32Hz) as per info from E90fleet.

see link below...

http://www.e90post.com/forums/showthread.php?t=5909


Good link btc, havent seen that.
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      03-01-2006, 11:20 PM   #13
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Quote:
Originally Posted by hotsand5
pressure regulated flap yes, but I still believe that it is used for the warming of the engine and exhaust gasses (creates lower emissions) and is controlled by the engine temp.

Temp has nothing to do with it. Poldim is correct.
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      03-01-2006, 11:25 PM   #14
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Nice to know, I was wondering the same thing.
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