Vibration Questions

[ckon]

Had my car in to the dealer again last week for Road Force Balancing of the third set of Michelin tires. This does seem to have almost eliminated the High-Speed vibration, although I can still feel some minor shaking. It has not made any difference to the flat-spotting and nor did I expect it to. I'm still not happy about the tire-swap as the Michelin's are noisier and not the same performance rating or load rating as the original Hankooks, but at least the vibration on the highway is tolerable.

You say "almost eliminated". What speed or conditions do you notice the vibrations now?

PS:I personally am having a harder and harder time accepting any vibration that isn't just road feel as "tolerable" in a $50K+ vehicle. I was feeling very cooperative with HMA, but now I'm just plain pissed!

 

[CanukV6]

Before the Road-Force Balancing, the vibration was very noticeable between 60-80mph. After the balancing there is some residual vibration at 75mph, but it is nowhere near as bad. As noted previously, I am still very unhappy with Hyundai with regard to the tire swap. The one thing it was supposed to cure - the flatspotting - is as bad if not worse and the tires they have supplied are not in my opinion an equal product to those supplied from the factory.

 

[Toga]

Yes, they were road force balanced. It's been definitely proven that my old wheels were damaged, but they don't seem to have been totally responsible for the vibration I was experiencing - the vibration was only somewhat reduced by changing the wheels, not eliminated.

These two vibrations seem to have the same "signature", meaning they both seem to originate in the same area of the car and feel the same. Is that making sense?

I know it's very difficult to actually know where a vibration is coming from, but has anyone else suspected a relationship between the early morning flat-spotting vibration and any other vibration, high speed or otherwise, they've experienced? EDIT: Also, if you are experiencing this similarity, please state whether your car is AWD. TIA.

I still have a minor high speed vibration at 65-75 mph on the michelins. I usually don't go over 80.
I definitely had flat spotting with the Hankooks since the vibration was relatively strong and would improve significantly after 10 minutes of driving. It also occurred at lower speeds, 25-45 mph.
I have the AWD.

 

[ckon]

I still have a minor high speed vibration at 65-75 mph on the michelins. I usually don't go over 80.
I definitely had flat spotting with the Hankooks since the vibration was relatively strong and would improve significantly after 10 minutes of driving. It also occurred at lower speeds, 25-45 mph.
I have the AWD.

Thanx, Toga. When you feel the high speed vibration does it feel a lot like the flat spotting vibration? Not necessarily the same intensity, but feeling like the same thing is causing it. I'm starting to think they are related. TIA

 

[Toga]

Thanx, Toga. When you feel the high speed vibration does it feel a lot like the flat spotting vibration? Not necessarily the same intensity, but feeling like the same thing is causing it. I'm starting to think they are related. TIA

The quality of the vibration is the same. The only difference is that it's of low intensity and doesn't improve after driving for a while.
I have not had my wheels rebalanced since the tire swap. I just haven't found the time to keep running back to the dealer. Also my wife has been driving the car more than I have recently and she has not complained about the vibration.
Personally, the vibration drives me crazy. The whole reason I bought the car is for the supposed low NVH so I have poor tolerance for the vibration. I also don't care what everyone else says about the hankooks, they were very noisy tires on rough pavement. I also have minor audible rattling noise coming from the ac unit. It's only audible intermittently. I also have some squeaks and rattles in the rear which are related to the rear sunshade screen. Only audible when the shade is up, so I leave it down.

 

[jarred52]

For the V6 cars, I think it would be very interesting if someone tried a set of the 17" wheels and 55 series tires off a pre-15 Genny on a car with a vibration issue that was not fixed by the tire swap. I am beginning to believe that Hyundai and the Lotus engineers went too far beyond better handling to try to make a luxury car into a sports sedan.

 

[ckon]

The quality of the vibration is the same. The only difference is that it's of low intensity and doesn't improve after driving for a while.
I have not had my wheels rebalanced since the tire swap. I just haven't found the time to keep running back to the dealer. Also my wife has been driving the car more than I have recently and she has not complained about the vibration.
Personally, the vibration drives me crazy. The whole reason I bought the car is for the supposed low NVH so I have poor tolerance for the vibration. I also don't care what everyone else says about the hankooks, they were very noisy tires on rough pavement. I also have minor audible rattling noise coming from the ac unit. It's only audible intermittently. I also have some squeaks and rattles in the rear which are related to the rear sunshade screen. Only audible when the shade is up, so I leave it down.

This may be hard to answer, but does the vibration seem to be coming from the same area of the car as the flat spotting vibration?

 

[ckon]

For the V6 cars, I think it would be very interesting if someone tried a set of the 17" wheels and 55 series tires off a pre-15 Genny on a car with a vibration issue that was not fixed by the tire swap. I am beginning to believe that Hyundai and the Lotus engineers went too far beyond better handling to try to make a luxury car into a sports sedan.

I like the first half of your statement, but I can't come up with any evidence that the cooperation between Hyundai and Lotus is responsible for what we're witnessing. Not to say the statement's incorrect - but I just can't see it. Maybe later, but not yet.

 

[CanukV6]

For the V6 cars, I think it would be very interesting if someone tried a set of the 17" wheels and 55 series tires off a pre-15 Genny on a car with a vibration issue that was not fixed by the tire swap. I am beginning to believe that Hyundai and the Lotus engineers went too far beyond better handling to try to make a luxury car into a sports sedan.

Firstly I don't think the pre-2015 Genesis wheels will fit the 2015 models, especially the AWD, as I believe the offset is totally different. Also, most 17" wheels won't clear the front brake calipers.

Lotus & Hyundai Engineers did a fantastic job of the suspension on the 2015 and having owned both 2009 and 2012 Genesis models, I can tell you the ride is significantly improved with no major detriment to handling. It's hard to make direct comparisons on the handling since my 2015 is an AWD model and now has Electrically assisted steering which definitely changes the feel of the car. Let's not forget that aside from the flat-spotting (which is an issue for both the original Hankook's and replacement Michelin's) there were no reported highway speed vibration issues with the original Hankook tires. My dealer actually refitted a set of Hankook tires and wheels to my car after the initial tire swap and that totally cured the highway speed vibration. This is definitely a tire and/or wheel problem.

 

[TroyK]

My dealer actually refitted a set of Hankook tires and wheels to my car after the initial tire swap and that totally cured the highway speed vibration.

if that fixed the issue, why didn't you keep that set of tires/wheels?

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[CanukV6]

if that fixed the issue, why didn't you keep that set of tires/wheels?

I wish I could have, but they were off a demonstrator car on the dealers lot that hadn't had the tire swap yet. I told the dealer I wanted the 19" wheels & Continental tires off a new 5-Litre they had in-stock, but no such luck.

 

[Toga]

This may be hard to answer, but does the vibration seem to be coming from the same area of the car as the flat spotting vibration?

I can't pinpoint an area. It feels generalized like it did before.

 

[TroyK]

just got my tires swapped out today. here are my initials impressions after having driven nearly 3 hours back home at speeds up to 85 mph (interstate). the michelins overall are quieter than the hankooks, particularly on coarse pavement. however, i'd say the hankooks provided a bit better ride at higher speeds. the michelins seem to give my car a bit harsher, slightly more jiggly ride. and yes i checked to make sure the tires weren't over inflated. i'm gonna drop 'em down to 31psi cold and see what that does for the ride. fwiw, the dealership did do a road force balance and the tires/wheels feel well balanced to me.

 

[J Evenden]

i don't belive it is flat spotting as not every owner is having an issue, & I have spoken with a number of owners of other makes running on similar tires and they have no issues. Hyundai seems to be making no effort to find the real problem, I have contacted Hyundai Canada many times but only hear from the dealer who hasn't the resources to resolve the problems.
In my uneducated opinion it would seem to be a manufacturing issue they are refusing to recognize.

 

[ksoze]

In my uneducated opinion it would seem to be a manufacturing issue they are refusing to recognize.

It would have to be a random manufacturing issue as the majority of owners here apparently do not have the issue. That does not mean some don not. The tire choice for a low profile, soft walled performance tires was obviously not to the liking of some not use to performance tires and their nuances during cold and standing issues.

 

[J Evenden]

It would have to be a random manufacturing issue as the majority of owners here apparently do not have the issue. That does not mean some don not. The tire choice for a low profile, soft walled performance tires was obviously not to the liking of some not use to performance tires and their nuances during cold and standing issues.

Random is probably right, like a faulty subcontractor, if it is tires why are other products not affected?

 

[ckon]

i don't belive it is flat spotting as not every owner is having an issue, & I have spoken with a number of owners of other makes running on similar tires and they have no issues. Hyundai seems to be making no effort to find the real problem, I have contacted Hyundai Canada many times but only hear from the dealer who hasn't the resources to resolve the problems.
In my uneducated opinion it would seem to be a manufacturing issue they are refusing to recognize.

I'm quite certain the problem's more common that we think because many drivers don't drive in a situation that will reveal the "flat-spotting" symptoms when they first leave their homes. For example, slow speeds and rough roads would disguise the symptoms.

Even though they've given up trying to find the issues on my car (which is a whole 'nother situation), I don't really think they're refusing to recognize the problem. I'll give them the benefit of the doubt on that one. I really believe they are stumped and are simply handling it wrong.

I suppose they COULD know what's causing it and don't want to spend what it would cost to fix it, but I don't really see any evidence of such. If that's the case, ignoring it would be really stupid because it's damaging the car's rep.

 

[ksoze]

I'm quite certain the problem's more common that we think because many drivers don't drive in a situation that will reveal the "flat-spotting" symptoms when they first leave their homes. For example, slow speeds and rough roads would disguise the symptoms.

True, however flat spotting is a tire issue not a car issue. It is inherent in low profile performance tires which seemed to take some Genesis buyers by surprise, hence the switch to a new tire.

 

[xsolara]

My car is primarily used for trips and can stay in garage for several days...I never felt vibrations from the Hankook tires. Sweet mysteries of life why some cars have the problem and majority of owner do not.

 

[ckon]

True, however flat spotting is a tire issue not a car issue. It is inherent in low profile performance tires which seemed to take some Genesis buyers by surprise, hence the switch to a new tire.

I can't prove it yet, but I don't believe the symptoms referred to by the term "flat-spotting" are really caused by the tires in our case. IMO, the name has been attributed because the symptom mimics flat spotting tires and was first thought to be the case.

There seem to be TWO definite vibration issues that are common, but not universal, mostly with AWD cars - what we refer to as flat-spotting (an issue which presents itself when first driving the car after it has been sitting, like a nylon tire does) and an intermittent high-speed vibration. These seem to be two separate problems. It's possible there's a relationship between the two, but that remains to be seen.

I became aware of the flat-spotting issue on my car when it was still very new, but didn't have the high speed issue until the Hankooks were replaced.

I could be wrong about any of this and I'll be glad when the cause(s) is finally discovered cuz I'd sure like my car FIXED!