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      07-02-2015, 03:52 PM   #1
tranquility
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rattling sound from exhaust?

There is a slight noise whenever the car's started up cold, but once it's warmed up, subsequent times starting up the car during the same day there is none. Is this a prb at all or something that needs monitoring? Thx.
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      07-02-2015, 04:18 PM   #2
paris1
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Mine does the same thing. I've just assumed it's got to do with all that plumbing for the turbos.
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      07-02-2015, 08:20 PM   #3
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From Car Magazine:

"The 35iS engine is the same engine that will power the forthcoming 1-series M Coupe, and with special acoustic flaps in the exhaust and a modified silencer this Z4 sounds rorty and rough and aggressive. The mid-range oomph lets you know it’s turbocharged, but its willingness to rev, great exhaust note and decent throttle response will make you think otherwise. It’s a cracking engine, with the character that’s usually so sorely missing from forced-induction units, and the standard-fit dual-clutch ‘box sends some nice little booms down the twin pipes on upshifts."
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      07-05-2015, 04:27 PM   #4
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The rattle is the butterfly valve getting stuck and not functioning 100% as it should. Commonly confused with the sound of a wastegate rattle as well. If I'm not mistaken, it's a N54 wide problem, not just the Z4 35i/s and as far as my dealers are concerned, it's a non-issue and not warrant for replacement regardless of how hard I try.

I did the golf-t mod so the butterfly valve never closes and the rattle was gone.
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      07-05-2015, 05:59 PM   #5
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Not being intimately familiar with the workings of the N54's plumbing, what exactly is the butterfly valve for and where is it located?
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      07-06-2015, 05:42 PM   #6
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Ok as long as it's not a ftn/safety issue... If it's just noise I can deal w that. Thx.
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