Whos got the Shakes?

[ASHDUMP]

I'm bringing my Genesis in for an alignment tomorrow because the car pulls to the left leaving me to hold the steering wheel to the right. I'm taking her to a tire place that has a pretty good alignment machine and they told me that they would also check the canter on all the wheels.

I know that has nothing to do with shakes;

Now to the shakes. When I hit the highway and look over at my passenger seat it is shaking pretty good. I can sometimes feel the shakes as well just sitting driving along. I also notice it when I'm driving with one hand, with my wrist placed on top of the steering wheel.

I had my wheels balanced a little while ago, but I don't think it helped. Could it be the OEM tires? I have a set of winter wheels and tires as well and I think they make the car shake too. My winter wheels are road forced balanced and the guy told me they looked good according to the computer.

Does anyone else's car shake? ...or does anyone else's passenger seat shake when driving on newly paved roads? It is mostly highway driving when it shakes.

 

[yuhaze]

I thought I was crazy, but I see the same thing. The passenger seat just shakes away, especially at highway speeds.
Apropos pulling off to one side, there is a tire balancing machine/technique called road force balancing. This will look at each tire individually and determine if it naturally pulls to one side or the other. They will then arrange the tires so that this pulling cancels out naturally; otherwise, I think there is an extra step to "shave the tread" to make it no longer pull.
The prices I got for this type of balancing ranged anywhere from $50 to $150, and some wanted $20 per tire if it needed shaving

 

[oreipa]

If I had to guess, I'd say your tires are scalloped from prolonged misalignment. Does the vibration frequency increase with speed?...another indicator. Take your open hand and put it across the tire tread wrapping your finger tips just over the inside of the tire. Run your hand around the tire and feel for undulations. If the scallops are bad enough, you'll be able to see them with your eye. Do the same for the outside of the tread.

 

[vega]

The DUMFLOPS on my Genesis will shake if the car sits more than a day. It will gradually stop as the tires warm up.

 

[ASHDUMP]

Well I'm going to see what the tire guys say tomorrow. I'm curious in their diagnosis. I've been so busy with work that I haven't found time to get her looked at.

I still have some good tread left on the Dunlops.... I think... I'll report back tomorrow.

 

[JDC]

.

Does anyone else's car shake?

Mine does for the first 10-15 minutes of cold driving, from near 40-the high 40's, it's a very rapid vibration with a low harmonic feel to it.

 

[dg_moore]

I don't have the shakes, but I still have the deceleration droning noise I reported here some time ago - when I take my foot off the gas at speeds above 50 mph I hear a distinct droning noise, which goes away if I apply enough pedal to get the engine and transmission speed in sync. Hyundai replaced the transmission about 3 months ago, but this did not correct the problem. It's going back in for service in a couple of weeks - the tech says this is definitely not normal behavior, and I haven't heard it in other Genesis' I have driven. It must be in the drive train someplace - maybe the drive shaft of U-joints? Hope they figure it out this time.

 

[ttsig]

I experienced this after replacing my Dunlops around the 35K mile mark. Because I drive a lot I went with Yokohama H4S tires because they have a 60,000 mile tread life warranty, but after installation I noticed that there was some extra vibration that I had never felt before. I made the shop rebalance them and it seemed get better, but was still there. I eventually took the car to a different tire shop that had a road force balancer and that seemed to do the trick.

 

[ASHDUMP]

I got my car aligned and so far so good in that department. They threw my tires up on the "road force" machine and said they were pretty good and didn't need adjusting. I'm still getting the shakes, but my car is driving straight... it must be the tires... I don't know though.

 

[crhbobby]

I have noticed that my passenger seat shakes while I am going 50 mph +. On the interstate at over 70 mph - my steering wheel has been shaking. I took it to Discount Tire where I bought my Michelins...and they balanced them. Not resolved. I took it back - they rebalanced it - and said one tire was slightly off. (This time I had a Genesis wheel cap missing by the time I got home.)

My steering wheel still shakes at speeds over 70 mph. Only on smooth roads though. If the road has a texture at all - no shakes. So I am guessing the rougher roads causes the shakes to cancel out. I can't remember the appropriate physics word for it.

Discount said my wheels were fine - I had wondered if maybe I had a bent rim. I did go about 9K without rotating in a span of 5 months. It could very well be the tires are choppy - although I would have thought the tire place would have taken note of it.

I am afraid to even ask the dealer...

Bob

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[ImInPA]

I got my car aligned and so far so good in that department. They threw my tires up on the "road force" machine and said they were pretty good and didn't need adjusting. I'm still getting the shakes, but my car is driving straight... it must be the tires... I don't know though.

See if you have a tire place that has the ability to "shave" the tires. it is quite possible and likely that you have high spots on your tires. A long long time ago (in a galaxy far far away....?) Shaving tires (truing) was standard procedure with new tires. With a suspsension as stiffly sprung as the Genesis, this can make the "roundness" of the tires more apparent.

 

[Aquineas]

On a tangent (but related to tires), take a look at this link comparing a Porsche 911 Turbo vs. a Corvette ZR-1 in a 1/4 Drag race. As if that alone isn't enough to watch, at one point they do a close-up of the ZR-1's tire; I was shocked at how much it's vibrating at speed. I can't imagine how this must manifest itself in the ride quality; or is it just normal for tires to act this way?

 

[JDC]

The DUMFLOPS on my Genesis will shake if the car sits more than a day. It will gradually stop as the tires warm up.

Yup.

So what do you all think are the best, top 3 brands/models to put on this car for smooth ride with good handling...

and no shakes?