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07-02-2015, 03:52 PM | #1 |
sportscars only
3244
Rep 3,195
Posts |
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, 08:20 PM | #3 |
Private
6
Rep 96
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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 |
Captain
68
Rep 715
Posts |
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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