Shimmying/Shaking Over 60 MPH

[hogujak]

Still can't fix this issue. Hyudai dealership is not even willing to help. What a pain..

 

[G90ATL]

Still can't fix this issue. Hyudai dealership is not even willing to help. What a pain..

Still working on this end as well. Taking car in next week.

 

[hogujak]

Still working on this end as well. Taking car in next week.

I feel like it is not the tire or steering wheel problem at this point. Body might not be strong enough for such a heavy vehicle.

 

[hogujak]

Is there any way I can "numb" my steering wheel? Too much road feel or vibration from my steering wheel.

Hyundai is not willing to help and genesis canada is the same. They(genesis) are kind when I talk to them but not really doing anything to help me.

 

[Scott A]

Is there any way I can "numb" my steering wheel? Too much road feel or vibration from my steering wheel.

Hyundai is not willing to help and genesis canada is the same. They(genesis) are kind when I talk to them but not really doing anything to help me.

In the Settings for the Car, on the main display. This is your last option on the Right on the Home Screen. You have dig down a bit to get to the right screen. You can modify the Individual Setting and try Comfort or Comfort+ for the Steering Wheel. I think this just boosts the effort, but that might help dampen some of the steering wheel feel. Note, the car defaults to Smart mode each time you start, at least on my 2019.

I just took my car on a 160 mile road trip, averaging 70 to 90MPH, with a brief peak of 120MPH. No issues with the steering. This is a RWD car.

 

[hogujak]

In the Settings for the Car, on the main display. This is your last option on the Right on the Home Screen. You have dig down a bit to get to the right screen. You can modify the Individual Setting and try Comfort or Comfort+ for the Steering Wheel. I think this just boosts the effort, but that might help dampen some of the steering wheel feel. Note, the car defaults to Smart mode each time you start, at least on my 2019.

I just took my car on a 160 mile road trip, averaging 70 to 90MPH, with a brief peak of 120MPH. No issues with the steering. This is a RWD car.

Thank you very much. I am definitely try that. What about suspension set up? I feel like I should go with sport(or stiff setting.. )Soft setting will give me more jiggly or bumpy feeling.

 

[ogogolby]

There is a Technical Service Bulletin regarding steering wheels in the G90. I don't have it but assume it can be found online.

 

[Scott A]

Thank you very much. I am definitely try that. What about suspension set up? I feel like I should go with sport(or stiff setting.. )Soft setting will give me more jiggly or bumpy feeling.

I use Soft setting around town, DFW is rife with Expansive Soils so there are areas where the pavement sucks. And I live in one of them.

But on the Highway, I set to Firm to reduce the floatyness at speed. I kind of wish there were two Individual Settings we could modify, and then set them to be the default.

 

[hogujak]

I use Soft setting around town, DFW is rife with Expansive Soils so there are areas where the pavement sucks. And I live in one of them.

But on the Highway, I set to Firm to reduce the floatyness at speed. I kind of wish there were two Individual Settings we could modify, and then set them to be the default.

I drive hwy 80% of time. I will set my suspension to firm and steering to softest setting. Hopefull that makes some changes. I am Korean and lots of koreans(comparing to north americans) drive g90(eq900). I see people having this issue and basically non of them fixed the issue. They have replaced drive shaft, engine mount, tires, rims, and other suspension components. Initially it gets better but eventually vibration comes back. I think this is something to do with body strength.

It is such a nice car so I do not want to give up but am not sure what else I can try.

 

[Scott A]

I drive hwy 80% of time. I will set my suspension to firm and steering to softest setting. Hopefull that makes some changes. I am Korean and lots of koreans(comparing to north americans) drive g90(eq900). I see people having this issue and basically non of them fixed the issue. They have replaced drive shaft, engine mount, tires, rims, and other suspension components. Initially it gets better but eventually vibration comes back. I think this is something to do with body strength.

It is such a nice car so I do not want to give up but am not sure what else I can try.

Interesting theory on the body structure. I have driven high mileage cars that felt solid to me, and a couple that were clearly "rode hard and put away wet" to use a Western UC slang term and they felt fine. My 2013, which weighed like 250 Kilos less had 85,000 on it when I traded and it was smooth and solid, even after driving over some parking lot curbs (I was not paying attention and yes, I was an idiot)

Can you get your car up on a lift? Look the suspension bushings, those should not wear out early in the car life, but they are perishable. Look for Cracks and chips and where it looks like the bushing has shrunk. Although, the dealer should have found that.

Is your car AWD? Try a RWD and see if it feels better. If so, then swap to that. You might even make money on the deal....

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[Dwagen]

Please excuse my ignorance but how would the rotors have any effect on the vibrations?

Here are some reasons that some vibrations could be caused by the brake rotors:
1. Panic stops can warp the rotors and if they are seriously warped they will set up a vibration as they turn and make contact with the brake pads. The vibration will be more pronounced when applying the brakes.
2. Rotors are a rotating mass and if they are out of balance one could experience vibrations. Eons ago when I was a mechanic we would get the best balance when the when the entire mass of tire, wheel, rotor/drum was spun together on the vehicle.

When I was searching for a used G90 I looked at the carfaxes of at least 50 different cars and I noticed that many of the examples had bent rim repairs. My judgement was that either the rims were easily damaged or the cars were driven on some of the worst roads imaginable.

My G90 had 4-wheel alignment done very early in it's documented history and the tires were never rotated and NEVER will be. Rotating staggered wheels is a no-no in my maintenance plan!

So far my G90 drives and rides smoother than any of my previous 49 cars! Been driving for 65 years, so that is lots of experience talking!

 

[G90ATL]

Here are some reasons that some vibrations could be caused by the brake rotors:
1. Panic stops can warp the rotors and if they are seriously warped they will set up a vibration as they turn and make contact with the brake pads. The vibration will be more pronounced when applying the brakes.
2. Rotors are a rotating mass and if they are out of balance one could experience vibrations. Eons ago when I was a mechanic we would get the best balance when the when the entire mass of tire, wheel, rotor/drum was spun together on the vehicle.

When I was searching for a used G90 I looked at the carfaxes of at least 50 different cars and I noticed that many of the examples had bent rim repairs. My judgement was that either the rims were easily damaged or the cars were driven on some of the worst roads imaginable.

My G90 had 4-wheel alignment done very early in it's documented history and the tires were never rotated and NEVER will be. Rotating staggered wheels is a no-no in my maintenance plan!

So far my G90 drives and rides smoother than any of my previous 49 cars! Been driving for 65 years, so that is lots of experience talking!

Good info - believe another vehicle in the family tree (Kia Stinger) has issues with rotors and vibrations. Not a fan of tire rotation - when car is aligned and balanced well, prefer to leave well enough alone. Appreciate your input and perspective. Happy New Year!

 

[Ninja400]

My G90 had 4-wheel alignment done very early in it's documented history and the tires were never rotated and NEVER will be. Rotating staggered wheels is a no-no in my maintenance plan!

Out of curiosity, what's the issue with rotating staggered wheels?

 

[Dwagen]

Out of curiosity, what's the issue with rotating staggered wheels?

Over many years manufacturers have recommended several schemes for tire rotation, front to back, x without spare, x with spare, etc. Because staggered tires can only be exchanged side to side by axle, the rotated tires would be changing rotational direction. Older tires were bias-ply and this method would cause lots of problems with ply separation. Tire manufacturers now claim that modern tires can survive the change in rotation, but for me and my trusted mechanic we do not rotate them and my experience with skipping rotation has been successful. So far, no shimmy or shaking for my G90. I treated my former BMW 750 the same way and had 30,000 miles on staggered Continentals with no problems.

 

[Gravy]

My G90 also has this similar symptom.

Vibration only appears within a certain speed range indicates the issue is more probably due to the car body's 1st order dynamic torsional rigidity, not tire balancing.

If the tire is unbalanced, then the vibration will become more noticeable after a certain speed, and the higher the speed you go, the more serious the vibration will be. From your description, looks like it is not this case.

For the 1st order dynamic torsional rigidity (which unit is Hz), it is the periodic impact stimulus caused by uneven road surface starting to reach the 1st order natural harmonic frequency of the car frame structure, therefore causes resonance (vibration). When the vehicle speed is too low (or too high), the road impact frequency is far less (or exceed) the resonance frequency, therefore no noticeable vibration; but with the right speed range, the road impact frequency falls in the car body's resonance frequency spectrum, so vibration becomes extraordinary violent to be noticeable.

The vibration depends on the resonance frequency, and also the amplitude; this is totally different than static rigidity. For G90, Genesis only publishes its static rigidity numbers. Not sure how good (or bad) its dynamic rigidity will be.

Look at Car and Driver's review, they also mentioned the following, all in fact are related to the G90's dynamic rigidity properties:

Our 2017 Genesis G90 Soothes, Cossets, and Generally Impresses for 40,000 Miles

"throughout the car's 30,000-mile life so far with us, there's been a mild front-end shimmy that feels like a tire imbalance but isn't."

"The G90 ought to be structurally stiffer, which is especially noticeable as the car accelerates on corrugated surfaces. Imagine, here, a dog shaking water off its back. Of course, when you build a car that is 204.9 inches long, it wants to twist."

Very interesting. Maybe this explains why the shaking/vibration/wobble symptoms seem to be related to the road surface. On my 2019 3.3T AWD, there is a definite wobble in the steering wheel on smooth surfaces, but the symptom disappears on broken surfaces at highway speeds. I suspect tire condition would also be a factor, but the underlying problem is structural. What a bummer.

Assuming that the shimmying is a structural thing, wouldn't it follow that vibrations at this level would result in damage to the frame/suspension/bushings/etc. ?

@moderators is it possible to create a poll for this issue?

 

[Mcc]

we do not rotate them and my experience with skipping rotation has been successful. So far, no shimmy or shaking for my G90.

I DO rotate them and my experience with rotation has been successful. So far, no shimmy or shaking for my G90. Five years, two set of Contis. So much for anecdotes.

 

[Scott A]

Out of curiosity, what's the issue with rotating staggered wheels?

Most tires these days are Directional. You can see a rotational arrow on the sidewall.

To rotate staggered tires, you have to flip the rims side to side, and then the tread pattern runs backwards. Then either the tread does not shed water like it is supposed to, or provide snow/mud traction like it is supposed to, or, worse, it wears out much faster rotating backwards. Even if they are not directional, wear can increase on a tire when you change it's rotation.

 

[NashvilleEquus]

https://www.tirerack.com/tires/TireSearchResults.jsp?tireIndex=0&autoMake=Genesis&autoYear=2020&autoModel=G90+5.0+RWD&autoModClar=&frontWidth=245%2F&frontRatio=45&frontDiameter=19&frontSortCode=57376&rearWidth=275%2F&rearRatio=40&rearDiameter=19&rearSortCode=57752&performance=ALL

I respectfully disagree that MOST tires are directional. Looks like only 4 or 5 of the 37 that show for a G90 are directional.

Anecdotally, I shy away from directional tires as they tend to get noisy when they wear.

I DO NOT rotate the staggered tires on our 2016 Equus, 2020 G90, 2017 Corvette Grand Sport, 2019 Mercedes SL450, or 1995 Nissan 300ZX Twin Turbo, which has directional tires.

 

[Gravy]

Very interesting. Maybe this explains why the shaking/vibration/wobble symptoms seem to be related to the road surface. On my 2019 3.3T AWD, there is a definite wobble in the steering wheel on smooth surfaces, but the symptom disappears on broken surfaces at highway speeds. I suspect tire condition would also be a factor, but the underlying problem is structural. What a bummer.

Assuming that the shimmying is a structural thing, wouldn't it follow that vibrations at this level would result in damage to the frame/suspension/bushings/etc. ?

@moderators is it possible to create a poll for this issue?

Update

Today I had the wheels balanced and an alignment. 3 wheels required re-balancing and the the right rear toe had to be adjusted.

The tech at Discount Tire said that the wear on rear inside treads indicated that the car was out of alignment. All tires measured 7/32nds. I took it for a spin on the highway and the steering wheel wobble was gone.

The car did not pull or feel out of alignment, but I had it done anyway. Took it for another spin and the difference is noticeable; the car feels much better centered and neutral at all speeds. Hope that this fixes the problem for the long-term.

 

[aaron.andelin]

I hope this is what works for you guys. I have a 17 g90 ultimate AWD. I've been tracking down this problem for over a year. Shaking at ~70. New tires, rims, rotors, pads. Alignment, suspension check. Road force balancing. The works. And nothing worked. The shaking happens at a specific speed, meaning everything relative to the speed the tire is spinning. (Wheel,tire,rotor,axle). All of those things were fine. What else is directly proportional to the wheels that I hadn't checked? The brakes seemed find, firm, and quiet. I figured I'll just bleed them all just a little bit since there are bleeders on both sides of each caliper. After bleeding one of them, I can't say for certain whether or not there was air in it, but the color of the fluid was much darker than the new stuff I got. So I went ahead and flushed and bled the entire brake system. The car feels like a brand new car. No shaking whatsoever. I had forgot how much of a pleasure it is to drive. I had wasted so much money trying to figure out this stupid problem. Maybe there was water in the line? Hope this helps