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I just installed two dampers on the engine side right in front of the flexible joint. My RX350 is the 2022 model year without the factory damper on the center pipe.
I can say that the vibration transmitted to the cabin has been reduced by more than 50% and is now below my annoyance level.
It feels much more like a "normal" amount of vibration any car would have. The vibration now easily blends with road vibration.
The engine still sounds exactly the same but that doesn't bother me. It sounded like that since new.
I might experiment and add two more dampers on the other side of the flexible joint to see if I can reduce the vibration even further.
I just installed two dampers on the engine side right in front of the flexible joint. My RX350 is the 2022 model year without the factory damper on the center pipe.
I can say that the vibration transmitted to the cabin has been reduced by more than 50% and is now below my annoyance level.
It feels much more like a "normal" amount of vibration any car would have. The vibration now easily blends with road vibration.
The engine still sounds exactly the same but that doesn't bother me. It sounded like that since new.
I might experiment and add two more dampers on the other side of the flexible joint to see if I can reduce the vibration even further.
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I would definitely experiment with the weights some more. My 2017 RX was perfectly smooth. Never a problem.
I would definitely experiment with the weights some more. My 2017 RX was perfectly smooth. Never a problem.
Mine was too until the dealer dropped the engine to fix the oil leak. Also, everyone has different sensitivity.
Experiment how? According to the thread, the spot in front of the flexible joint on the engine side gives the best results. Attaching the dampers on the center pipe itself gives diminishing returns the further you go from the flexible joint.
I installed only one damper and two clamps in front of the two spring loaded bolts. On clamp is 2 1/2" and the other is 2 3/4".
I am curious of the effect of one damper vs. two. I figured two would require twice as much energy to transmit vibration as one, so I installed two. But then again every car is different.
I am curious of the effect of one damper vs. two. I figured two would require twice as much energy to transmit vibration as one, so I installed two. But then again every car is different.
Do you think it's worth checking the torque specs on flexible joint bolts? It's a near guarantee the dealership didn't torque them to spec; they just put them on with an impact to save time. I bet is they are way too tight. Whether that makes a difference or not is anyone's guess.
Do you think it's worth checking the torque specs on flexible joint bolts? It's a near guarantee the dealership didn't torque them to spec; they just put them on with an impact to save time. I bet is they are way too tight. Whether that makes a difference or not is anyone's guess.
I don't have a torque wrench. Torque spec on those bolts is 43Nm. On my car, the springs and bolts (length and how far they're screwed in) looks exactly the same as on all the other photos I've seen in this thread, so I'm guessing the torque is fine.
The instructions for reinstalling the exhaust are interesting... they even make you check the distance between the flanges of the flexible joint after installation.
The instructions for reinstalling the exhaust are interesting... they even make you check the distance between the flanges of the flexible joint after installation.
I had the TSB new pipe installed when I bought the car when it was a year old with 12,000 miles on it, it's been fine until three months ago. So I decided to fix the problem myself.
I had the TSB new pipe installed when I bought the car when it was a year old with 12,000 miles on it, it's been fine until three months ago. So I decided to fix the problem myself.
Since the TSB now finally covers my 2022 RX350, I might get it done next time I'm in for an oil change. I'll try to add two more dampers and see what that does.
Can you let us know the outcome when you do this experiment?
Won't be for a while. I'm kind of tired of constantly going under the car and doing test drives. How about someone else does this for the community?
I removed one damper this morning and did a test drive with just one installed facing the passenger side on the engine side of the flexible joint.
This seems to have reduced the vibration transmitted to the cabin the most. I still get some drone when I floor it around 1750-2000RPM, but now at least the car is not annoying me anymore.
Two dampers gave a similar result to one, but caused a very loud resonance at around 950-1000RPM.
03-29-24, 12:09 PM
