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Vibration from poly mounts at high speed? (70+ mph)

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Vibration from poly mounts at high speed? (70+ mph)

 
Old 03-22-2018, 10:35 AM
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Vibration from poly mounts at high speed? (70+ mph)

Is this possible for the car to shake because of the poly mounts at speeds 70-110mph?

The car is at the shop and the mechanic replaced tie rods but he stated that vibration is still present. We can't rule out the mounts because I have poly filled.

I have replaced the wheels, tires, I have new flex discs and I'll replace the tranny mount this weekend to see if that will help anything.

I also have a weird vibration in park at 1800-2000rpm, so I wonder if that's tied into this. Research shows it might be the torque converter...
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Old 03-22-2018, 10:50 AM
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Does the car feel like its swaying? Check the rear bushings.
Does it vibrate on throttle or in neutral while rolling at speed?
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Old 03-22-2018, 12:44 PM
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Lol..you just answered your own question
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Old 03-22-2018, 01:20 PM
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It's def the mounts, I drove it fast on the highway and they vibrate a bit.

But it's definitely not as bas as it used to be before the service he performed (bearings, tie rods, balance tires, alignment) the car's a lot better. Don't get solid mounts!
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Old 03-22-2018, 05:05 PM
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Shouldn't you have solid trans mount if you have solid motor mount?
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Old 03-22-2018, 05:14 PM
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Originally Posted by MACEDON View Post
It's def the mounts, I drove it fast on the highway and they vibrate a bit.

But it's definitely not as bas as it used to be before the service he performed (bearings, tie rods, balance tires, alignment) the car's a lot better. Don't get solid mounts!
I just replaced my mounts about 6 months ago with OEM Lemforder, but was thinking about using solid poly mounts next time around.
This thread is definitely making me question that plan - seriously don't want any vibration.
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Old 03-22-2018, 05:45 PM
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You'll definitely feel more of a vibration with poly mounts. The poly is stiffer than the oem rubber mounts and on top of that, you don't have the fluid anymore.
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Old 03-22-2018, 05:56 PM
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Countdown until the solid poly mount manufacturer (East Coast Euro?) chimes in.
10, 9, 8, ...
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Old 03-22-2018, 05:58 PM
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Originally Posted by MACEDON View Post
It's def the mounts, I drove it fast on the highway and they vibrate a bit.

But it's definitely not as bas as it used to be before the service he performed (bearings, tie rods, balance tires, alignment) the car's a lot better. Don't get solid mounts!
I warned about this when you wanted them ,what you expect from solid mounts
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Old 03-22-2018, 06:10 PM
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Replacing OEM mounts is a crappy job to say the least but they are so cheap and vibration free...
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Old 03-23-2018, 08:34 AM
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Originally Posted by Bahnstormer View Post
Countdown until the solid poly mount manufacturer (East Coast Euro?) chimes in.
10, 9, 8, ...
The OP is not using our product. He is using a stock mount filled with polyurethane. Ours is designed from scratch to achieve our goals and minimize vibration.

Last edited by East Coast Euro; 03-23-2018 at 08:36 AM.
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Old 03-23-2018, 01:39 PM
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Originally Posted by East Coast Euro View Post
The OP is not using our product. He is using a stock mount filled with polyurethane. Ours is designed from scratch to achieve our goals and minimize vibration.

The mounts that he is using were made by me - just OEM Poly Filled, 80A... made and sold for high power cars that eat mounts, little care was given to vibration as the customers they are made for and marketed to, don't care about vibration. A few of our cars can bust a set of mounts in one dyno session... (650+ whp cars). I have bought and installed a set of the ECE mounts and they are the best of both worlds.... we have put in heavy testing on the shop car, and they don't flex much at all, and are much smoother than the ones I took out (mine).

Big shout out to ECE for coming up with a quality solution!!

Thanks

Dave
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Old 03-23-2018, 03:23 PM
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Some good respect here between contributors to the AMG scene
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Old 03-23-2018, 03:29 PM
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Originally Posted by DavesMeanE's View Post
The mounts that he is using were made by me - just OEM Poly Filled, 80A... made and sold for high power cars that eat mounts, little care was given to vibration as the customers they are made for and marketed to, don't care about vibration. A few of our cars can bust a set of mounts in one dyno session... (650+ whp cars). I have bought and installed a set of the ECE mounts and they are the best of both worlds.... we have put in heavy testing on the shop car, and they don't flex much at all, and are much smoother than the ones I took out (mine).

Big shout out to ECE for coming up with a quality solution!!

Thanks

Dave
Thank you for the kind words! Great to hear they are performing well 👍
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Old 03-23-2018, 04:30 PM
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So to make it clear: My car had other underlying issues with the suspension and bearings that lead to a different vibration at high speed, so really I never even had a clean chance to experience what the poly mounts should actually feel like.

I made this post before I picked my car up from the shop. After I picked it up I drove it on the highway post repairs and it was a night and day difference. The vibration from the poly mounts is barely an issue at this point, I had a much worse problem going on. Luckily my mechanic was able to get to the bottom of it.

At this point I'm not even sure i want real mounts again, I love the responsiveness of these mounts.

Ahmad's mounts are the future though. Curious to see how the tranny mount would perform and what it does for day to day driving. It's next on my list of things I want to install.
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Old 03-23-2018, 04:33 PM
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Originally Posted by Bahnstormer View Post
Countdown until the solid poly mount manufacturer (East Coast Euro?) chimes in.
10, 9, 8, ...

Like mentioned these were poly filled, not the fabricated ones.

The issue turned out to be something other than the mounts, they perform at an acceptable level.
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Old 03-23-2018, 06:21 PM
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So what was the issue?
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Old 03-26-2018, 03:56 PM
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Needed new tie rods, to tighten the bearings, and a new alignment.
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