Chaps,i can hear a slight noise when coming down the rev's around 25k mark and only when reducing power,its not from the engine/vanos but near the drivers seat underneath,bracket/cats/ ?? its only a light sound,no loss of power going up the revs at all,any pointers? TIA.
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Strange little noise...
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Originally posted by kwoffa View PostJust seems strange that its when coming the revs...
That's probably just the point when the correct resonance kicks in to set it off2002 '52 S54 - Titanium Silver with 18" BBS LMs, AP Racing BBK, KW V3, H&R anti roll bars & ACS flippers (previously 2000 'X' S50 - Arctic Silver)
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Every time (twice) when I have had the same type of noise coming beneath the car with certain revs it has been the front exhaust support bracket : part nbr 9 in this schematic : http://bmwfans.info/parts-catalog/Z3..._lambda_probe/
It had a minor amount of corrosion but had been neatly broken into two parts and the broken ends were rubbing against each other due to vibration. It was not very obvious to notice but only noticed it after trying to wiggle the exhaust from side to side and noticed that the bracket is actually not holding.
Perhaps this was due to vibrations or overtightening or something else. Nowadays this is the first thing for me to check if there is some resonance noise coming beneath the car. The sound travels nicely through the exhaust system so it can seem to come from front or back given the situation.The older I get, the faster I was ...
BMW HP2 Sport
ex- BMW Z3 M Coupe - Cosmosschwartz Metallic
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