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Engine Specific Info and Questions => IDI Engine => Topic started by: molgrips on October 27, 2008, 03:36:00 am
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On my AAZ, on the rear sub-frame there's a metal block about 6" square sticking out backwards, underneath where the downpipe comes down.
Wtf is it? Some kind of vibration damping counterweight perhaps?
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you got it in one - its a dead mass presumably for changing some harmonic vibration frequency...
i actually recently pulled mine off, thinking "how much difference could it make?" infact, it has seemed to make a difference - i used to feel some mild steering vibration under high load (like driving up a big hill on the freeway) - now its GONE!
i'm leaving mine off.
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I'm getting a small amount of buzzing and noise at higher revs, when cruising. I might experiment with it. Maybe I can tune it some more by adding weight :)
Question is, why would it stop doing whatever job it was designed to do in the first place?
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rust?
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The plan is to put the front wheels up on ramps and tie some string or something to the accelerator cable, so I can lie underneath the car and rev it up to 2.5krpm and listen for any noise. Can't hear a thing from the top apart from normal engine noise.
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my sisters 2.0 has one, i am curious what they are, made it a pita to get the passenger axel in.
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my 91 golf donor car has this as well.. I like the idea of not having to move it over when i do the gas->diesel swap i am planning. :P