Exhaust vibration absorber

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Rodent
Joined: Mon 22 May, 2017 08:34
Posts: 24

  Z3 roadster 2.2i

Exhaust vibration absorber

Post by Rodent » Thu 22 Jun, 2017 10:52

My recently purchased 2.2 lit z3 had a strange metallic rattle on the passenger side. I had a look underneath and noticed that the vibration absorber (marked 80hz.) was very loose and wobbly. It looks like the spacers had rusted away, leaving the rubber lump very loose.
I have taken it off but still notice the rattle noise, perhaps a little quieter.
My question is: are these dampers really necessary? Will my exhaust shake itself to bits without the damper in place?
Thanks

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Gazza
Site Admin
Joined: Tue 04 Oct, 2005 21:58
Posts: 9200

  M roadster S54
Location: East London/Essex

Re: Exhaust vibration absorber

Post by Gazza » Thu 22 Jun, 2017 17:33

I removed it from my 2.8, didn't notice any difference.
Gazza

"Understeer is when you hit the wall with the front of the car, oversteer is when you hit the wall with the rear of the car. Horsepower is how fast you hit the wall and torque is how far you take the wall with you"

S54 M roadster Image, BMW Z1, BMW M3 CSL, Mustang Fastback

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lightning
Joined: Tue 27 Nov, 2007 08:15
Posts: 814

  Z3 roadster 3.0i
Location: Stockport

Re: Exhaust vibration absorber

Post by lightning » Thu 22 Jun, 2017 21:07

Must be there for a reason.

Rodent
Joined: Mon 22 May, 2017 08:34
Posts: 24

  Z3 roadster 2.2i

Re: Exhaust vibration absorber

Post by Rodent » Fri 23 Jun, 2017 12:34

if its necessary to remove harmful vibration, why then has my exhaust system not shaken itself to pieces since I removed it? I read somewhere that for the USA market, it was felt that any sort of vibration would detract from the driving experience. I have to be honest and say that between pot-holed roads, lovely exhaust note and my enthusiastic driving I have not really noticed any bad vibrations. whats left of mine was marked as 80hz, but looking online it seems there are many different hz. ratings available.

4wheels
Joined: Sat 24 Sep, 2016 20:42
Posts: 71

  Z3 roadster 3.0i

Re: Exhaust vibration absorber

Post by 4wheels » Sat 08 Jul, 2017 20:30

i was painting under mine today, well preparing for painting, removing the rust...
and noticed these, just looked them up... i thought thats what they were for but wasnt sure..... they gotta be heavy to do anything ? and heavy on a sports car is BAD!!

http://www.realoem.com/bmw/enUS/showpar ... Id=51_2331

ill be taking them off lol.

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