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Old 02-27-2021, 04:44 PM   #1
needstobefaster
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Default Please Help, Highway Shimmy Wont Go Away

Hey guys,

So Iíve had a shimmy whenever Iím between 65-80 (sometimes faster) and I canít figure it out.

Iíve had the tires balanced and it was still there, thought maybe my rotors were warped so I changed them, torqued wheels all around. I still get a shimmy and sometimes when I let off the gas it feels hard and lightens up a bit.

Could it be my driveshaft ? Iíve seen a few comments of people having the same problem but I donít hear any clunking or anything like that. Is there a way to check if itís bad without actually taking it out?

Appreciate any help!!
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Old 02-27-2021, 05:44 PM   #2
Jay11STI
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Have you had an alignment done yet? Might be something to consider. Usually rotate balance and alignment go hand and hand. If you verified you dont have any bent wheels, id probably do an alignment next.
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Old 02-27-2021, 06:04 PM   #3
snow_bound26
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What, if any, suspension mods do you have? What tires, and size?
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Old 02-27-2021, 06:49 PM   #4
supermarkus
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My shimmy didnít go away until I had the wheels road force balanced.
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Old 02-28-2021, 09:00 AM   #5
needstobefaster
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Quote:
Originally Posted by snow_bound26 View Post
What, if any, suspension mods do you have? What tires, and size?


I just have BC coil overs, about 5 years old, and I have the Dunlopís of a 2015 wrx, they are 245,40/18 I believe.
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Old 02-28-2021, 09:02 AM   #6
needstobefaster
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Quote:
Originally Posted by supermarkus View Post
My shimmy didnít go away until I had the wheels road force balanced.


Ah, thatís such a pain. I do have 17inch Rotas I just picked up used so maybe putting brand new tires on them and throwing them on will change the car. However, if new wheels AND brand new tires donít fix it, could it possibly be driveshaft or axle related even if I do not hear any clicking or clunking?
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Old 02-28-2021, 09:04 AM   #7
needstobefaster
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Quote:
Originally Posted by Jay11STI View Post
Have you had an alignment done yet? Might be something to consider. Usually rotate balance and alignment go hand and hand. If you verified you dont have any bent wheels, id probably do an alignment next.


Now that I think about it, that could be my probably. I got an alignment done years ago and havenít had one since. I was hoping to grab the white line rollcenter bump steer kit just since my car has 100k and Iím in jersey where salt kills bushings.
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Old 02-28-2021, 02:31 PM   #8
a5m
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Wheel bearings? My buddy's G35 did this badly and he almost wiped out driving in the rain.
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Old 02-28-2021, 02:47 PM   #9
snow_bound26
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Quote:
Originally Posted by needstobefaster View Post
I just have BC coil overs, about 5 years old, and I have the Dunlopís of a 2015 wrx, they are 245,40/18 I believe.


I would get an alignment to rule it out, but I'm guessing the tires are causing some tram lining. Basically, you're feeling the minor deviations in the road surface. This happens more as tires get wider. A surfer sidewall or stiffer suspension parts can increase this feeling.

With the age of your BCs, they probably aren't sliding as smooth as they should which could enhance the feeling as well.
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Old 02-28-2021, 03:44 PM   #10
needstobefaster
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Quote:
Originally Posted by snow_bound26 View Post
I would get an alignment to rule it out, but I'm guessing the tires are causing some tram lining. Basically, you're feeling the minor deviations in the road surface. This happens more as tires get wider. A surfer sidewall or stiffer suspension parts can increase this feeling.

With the age of your BCs, they probably aren't sliding as smooth as they should which could enhance the feeling as well.


Would the coil overs cause a squeak at all if they donít slide smooth? Iím going to get an alignment and see if that fixes it, if not, Iíll try the new rims and tires I have but after that I guess I will check the suspension and maybe wheel bearing. Really hoping itís just the tires I have since they are a few years old and stretched on 18x9.5
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Old 02-28-2021, 06:38 PM   #11
akritzer
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Jack it up if you can and wiggle each wheel. Check to see if there's any play up/down (ball joint) or left/right (tie rod). Play can also be from a bad wheel bearing. Do you hear any unusual noises while driving at highway speed, like a whirring or roaring?
Pull your wheels off and have a good gander at your tires. Is the tread wearing evenly?
While your wheels are off take a good look at your control arm bushings.
Mileage is important, 100k is a good time to start looking at all the things I mentioned.
Check out this post about your car's midlife crisis and you.
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Old 02-28-2021, 07:41 PM   #12
snow_bound26
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Quote:
Originally Posted by needstobefaster View Post
Would the coil overs cause a squeak at all if they donít slide smooth? Iím going to get an alignment and see if that fixes it, if not, Iíll try the new rims and tires I have but after that I guess I will check the suspension and maybe wheel bearing. Really hoping itís just the tires I have since they are a few years old and stretched on 18x9.5


I've definitely found that stretched tires tram line more. I stretched one set and hated the way they felt driving. Coilovers can make all kinds of different noises when they are going bad; squeaking, thunking, etc. Worn tires will also tram line more than new. I'd guess the combination is the main contributor to what you're feeling. Especially during the winter months when the road becomes more uneven in colder weather.
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Old 02-28-2021, 09:12 PM   #13
murrdogg24
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really?? you're using tires off a 2015?? you should replace your tires they are beyond their life span. crappy tires will cause loss of stability...
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