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      12-15-2014, 05:30 PM   #1
chris82
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Need help, lots of vibrations coming from winter setup

Hi guys,

Need some help here. I just put on my winter wheels/tires and I'm getting a lot of vibrations from them. On super smooth road surfaces like a freshly paved concrete highway, everything is normal, but on other road surfaces that aren't as smooth I get very annoying vibration from the tires. It's like they are picking up every single road imperfection. I'm thinking this is because of my JRZs and my stiffer suspension setup? I had these same winter wheels/tires on last winter and had no such vibrations. I've checked the pressures, the alignment is good, tread looks good, etc. I had no vibrations when I had my summer wheels/tires (Pilot super sports) on.

Are the wheels not balanced? I'm confused because on some road surfaces they seem fine. the speed I'm going doesn't seem to matter either. What's happening!?

Thanks
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      12-15-2014, 06:22 PM   #2
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What are you running on your suspension rebound/compression wise?

You might have it tuned such you're jacking the wheel when you're compressing the tire causing some odd vibrations.
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      12-15-2014, 09:17 PM   #3
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Quote:
Originally Posted by Kgolf31 View Post
What are you running on your suspension rebound/compression wise?

You might have it tuned such you're jacking the wheel when you're compressing the tire causing some odd vibrations.
They're in the middle all around. The car rides great. all four corners giving off the vibration btw
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      12-15-2014, 09:34 PM   #4
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Quote:
Originally Posted by chris82
Quote:
Originally Posted by Kgolf31 View Post
What are you running on your suspension rebound/compression wise?

You might have it tuned such you're jacking the wheel when you're compressing the tire causing some odd vibrations.
They're in the middle all around. The car rides great. all four corners giving off the vibration btw
Could be the fact that the soft winter tires are essentially acting as a second damper and your shock is trying to now dampen 2 masses which results in severe oscillation.

Turn down the dampers to full soft and see if the same thing happens. I bet you need more dampening
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      12-15-2014, 09:39 PM   #5
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Quote:
Originally Posted by Kgolf31 View Post
Could be the fact that the soft winter tires are essentially acting as a second damper and your shock is trying to now dampen 2 masses which results in severe oscillation.

Turn down the dampers to full soft and see if the same thing happens. I bet you need more dampening
You're saying turn them up? I'll give it a try, I'm very curious to see if this works
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      12-15-2014, 09:47 PM   #6
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Quote:
Originally Posted by chris82
Quote:
Originally Posted by Kgolf31 View Post
Could be the fact that the soft winter tires are essentially acting as a second damper and your shock is trying to now dampen 2 masses which results in severe oscillation.

Turn down the dampers to full soft and see if the same thing happens. I bet you need more dampening
You're saying turn them up? I'll give it a try, I'm very curious to see if this works
No..Turn them down.

I think the damper is too stiff on this soft tire. When you hit a small bump the shock quickly corrects but too quick for the soft tire, that is still compressing. This is leading to shocking the car, and thus making the ride very rough.

You can overdamp or underdamp the car. Overdamping can lead to under oscillation. Like you hitting a bump then the whole road contact is transferred to the car even after the bump occured.

Underdamping is when you don't dampen the bump enough so you get a wavy effect thru the car... like OE suspension.

Turn the shocks down to make the ride as soft as possible.


Last edited by Kgolf31; 12-15-2014 at 09:54 PM..
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      12-15-2014, 10:14 PM   #7
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Quote:
Originally Posted by Kgolf31 View Post
No..Turn them down.

I think the damper is too stiff on this soft tire. When you hit a small bump the shock quickly corrects but too quick for the soft tire, that is still compressing. This is leading to shocking the car, and thus making the ride very rough.

You can overdamp or underdamp the car. Overdamping can lead to under oscillation. Like you hitting a bump then the whole road contact is transferred to the car even after the bump occured.

Underdamping is when you don't dampen the bump enough so you get a wavy effect thru the car... like OE suspension.

Turn the shocks down to make the ride as soft as possible.

Oh I misread your post, will give it a try tomorrow
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      12-16-2014, 07:48 AM   #8
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I turned down the fronts to full soft before I drove to work today, and I think it made a difference but I'm still getting vibrations. The rears are still at 11/22 so that might be where they are coming from now. I have to rip out the trunk lining to get to those MFers.

I appreciate the help, I think you're on the right track here
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      12-16-2014, 10:20 AM   #9
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Quote:
Originally Posted by chris82 View Post
I turned down the fronts to full soft before I drove to work today, and I think it made a difference but I'm still getting vibrations. The rears are still at 11/22 so that might be where they are coming from now. I have to rip out the trunk lining to get to those MFers.

I appreciate the help, I think you're on the right track here
You should just cut an access hole where you can flip the back the carpet to access the rebound. I should take pictures and show you what I've done.

Hopefully the rears will help calm down the vibrations
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      12-16-2014, 10:31 AM   #10
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Quote:
Originally Posted by Kgolf31 View Post
You should just cut an access hole where you can flip the back the carpet to access the rebound. I should take pictures and show you what I've done.

Hopefully the rears will help calm down the vibrations
Yea would you mind? I doubt I'll ever get the rear height adjusters from JRZ lol
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      12-16-2014, 03:04 PM   #11
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Here's mine - Ohlins adjustment knob

Slotted the carpet for easier access and it also allows for easier adjustment.
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      12-16-2014, 04:09 PM   #12
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Originally Posted by E82MSport View Post


Here's mine - Ohlins adjustment knob

Slotted the carpet for easier access and it also allows for easier adjustment.
That looks good, I need to get those adjusters. Would it be hard to reach the knob just by cutting a hole in the carpet if you didn't have the external adjusters?
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      12-16-2014, 06:04 PM   #13
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Here's mine. I don't have issues adjusting.



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      12-22-2014, 08:13 AM   #14
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Okay, I cannot figure this out, the vibrations seem just as bad this morning as they ever were so I'm going to get my wheels/tires balanced to see if that is the issue.
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      12-23-2014, 04:04 PM   #15
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Well after all this it turns out all 4 wheels were bent, can you believe that? I couldn't, but they straightened em' out and no more vibrations. They were fine last year, oh well, only $150 for all 4 wheels to get straightened, so I'm happy it was as simple as that.

Thanks for the help anyways!
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      01-06-2015, 11:14 PM   #16
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I have had bent wheels before. As careful as I am about potholes and other road irregularities, it happened. The shop showed me the run-out before they straightened them. It is amazing what a small bend can do to your ride quality, and like you, how much better they ride after having been straightened.
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