by jondee86 » Sun Sep 16, 2007 2:56 pm
Thanks for the replies. The reason I asked about this is that I just
took the car out for the first time after fitting a full set of TRD bushings
in the back to replace the old OEM rubber.
Straight off I noticed a big increase in "exhaust" resonance inside the
car. Nothing was changed on the exhaust, and it is a new system and
in good condition. Most noticable increase is in the 2500 to 3500 range.
Thinking about it a bit more, I guess what has actually happened is
that the the amount of engine vibration being transmitted to the body
has increased. If there is metal all the way from the engine to the back
axle, then the stiffer bushings will pass more to the body.
The frequency will be similar to the exhaust note, and so it will seem
as if the exhaust resonance has got louder. Just a theory, but I would
be interested to know if anyone else has noticed the same thing when
upgrading to TRD or urethane bushings.
Cheers... jondee86
1984 AE86 Corolla GT Liftback, NZ new... now with GZE
spec small port, twinscrew s/c and water/methanol injection

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