Jaymanbikes Posted August 31, 2016 Share Posted August 31, 2016 I recently purchased a 77 280Z, while replacing all the bushing I noticed this very home made looking bracket attached to the car. It is bolted through the diff support bracket that also holds the control arm bushings. It consists of a main base and attached to it is a stack of several pieces of plate that come up right under the rear sway bar. Any ideas what they may have been trying to do here? Quote Link to comment Share on other sites More sharing options...
pamato Posted August 31, 2016 Share Posted August 31, 2016 The metal plates are referred to as a 'mass damper'. These are usually used as a last resort to fix noise/vibration problems that crop up late in the vehicle's development cycle. By attaching the mass damper to the offending piece, you change it's resonant frequency - the idea is to move the resonant frequency to one that the piece is not likely to see. Quote Link to comment Share on other sites More sharing options...
NewZed Posted August 31, 2016 Share Posted August 31, 2016 It's a stock factory piece installed on all 280Z's from the factory. They just made it ugly. It's shown in the Rear Axle chapter, twice, but the illustrations are poor. "Damper plate". Quote Link to comment Share on other sites More sharing options...
TimZ Posted September 1, 2016 Share Posted September 1, 2016 On 8/31/2016 at 4:38 PM, pamato said: The metal plates are referred to as a 'mass damper'. These are usually used as a last resort to fix noise/vibration problems that crop up late in the vehicle's development cycle. By attaching the mass damper to the offending piece, you change it's resonant frequency - the idea is to move the resonant frequency to one that the piece is not likely to see. Hmmm... that sounds familiar. Somebody smart must have said that... ;P Quote Link to comment Share on other sites More sharing options...
dmoralesbello Posted September 2, 2016 Share Posted September 2, 2016 My "78 has the exact same setup from factory. Quote Link to comment Share on other sites More sharing options...
Ken Smith Posted November 18, 2016 Share Posted November 18, 2016 My 75 has them also. Many have said you can just remove them and save some weight. I guess if you feel a difference you could just re-install them. Quote Link to comment Share on other sites More sharing options...
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