New 07 IS Highway vibration
10-07-06, 03:58 AM
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New 07 IS Highway vibration
Hey guys,
I am the proud owner of an 07 IS350 with lux/nav/ml red/black. I love the car..however, I didn't expect any highway vibration from a $44k car.
I am experiencing a slight shimmy to the body (not steering wheel) every second or so around 80mph. If I accelerate to 100+mph is goes away. I known, I know, drive 100+ all the time right....
Should I take it back to the dealer? I picked it up yesterday and I have 120mile on the odo. I reside a 120 miles from the dealer.
I found the tire pressure at 40psi, so I lowered it to 35psi. I haven't hit the highway with it again yet so I don't know if that helped or not.
Anyone else experience this shimmy/viration at 80mph with their IS?
James
I am the proud owner of an 07 IS350 with lux/nav/ml red/black. I love the car..however, I didn't expect any highway vibration from a $44k car.
I am experiencing a slight shimmy to the body (not steering wheel) every second or so around 80mph. If I accelerate to 100+mph is goes away. I known, I know, drive 100+ all the time right....
Should I take it back to the dealer? I picked it up yesterday and I have 120mile on the odo. I reside a 120 miles from the dealer.
I found the tire pressure at 40psi, so I lowered it to 35psi. I haven't hit the highway with it again yet so I don't know if that helped or not.
Anyone else experience this shimmy/viration at 80mph with their IS?
James
10-07-06, 08:44 AM
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Actually I think I have the exact same problem. It feels like you are going over small tiny bumps every 1 second when driving at about 80. It then goes away above and under 80 mph. I thought it was the roads around here and it is with a 2007 IS 350 too. Please let us know if you find anything.
10-07-06, 09:58 AM
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I was testing to see where the vibration started/stopped
I will report any new findings.
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10-07-06, 04:56 PM
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What is your tire brand? I bet it is Dunlop.
That's the characteristics of all Dunlop tires, always out-of-round.
If you want smoother ride, replace your Dunlops with something else. Michelin or Bridgestone.
That's the characteristics of all Dunlop tires, always out-of-round.
If you want smoother ride, replace your Dunlops with something else. Michelin or Bridgestone.
10-07-06, 05:16 PM
#9
10-07-06, 06:00 PM
#10
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I don't have a hard answer for you on the 80 MPH shimmy...but one of my guesses is that if it is only in the body and not the steering wheel....and two of you have reported the same thing in the same car at the same speed....it could be in the design of the rear suspension bushings that causes a harmonization with the spinning rear drive shafts and wheels at that speed.
A further clue to this might be if the IS250AWD, with four spinning driveshafts instead of just two rear ones, does the same thing.
Last edited by mmarshall; 10-07-06 at 06:07 PM.
10-08-06, 09:13 AM
#13
if the frequency of the up and down movement of the highway matches the frequency of the tire/suspension it will hit something called resonance frequency. I guess what's happening is that you're hitting this resonance at that speed. I would think that decrease in tire pressure or increase may help it... not sure.
the best way to understand resonance frequency is to think bout a swing. If you're going to push a swing.. where are you goin to push it? Pretty much at the very peak where it comes back and about to go forwards. Now if you always push at that point it requre very little to make it move.
if the frequency of the car (the swing) matches the frequency of the push (the road) ...
this is the same concept as noise cancelation headphones... but they're just having the exact opposite frequency (well close to exact opposite)
the best way to understand resonance frequency is to think bout a swing. If you're going to push a swing.. where are you goin to push it? Pretty much at the very peak where it comes back and about to go forwards. Now if you always push at that point it requre very little to make it move.
if the frequency of the car (the swing) matches the frequency of the push (the road) ...
this is the same concept as noise cancelation headphones... but they're just having the exact opposite frequency (well close to exact opposite)
10-08-06, 10:59 AM
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Same here.
Frequency calculations aside, I don't want vibration out of a $45k car period. I noticed that the red dot on the pass/rear tire is 180º out of phase from the valve stem, Maybe someone wasn't paying attention during tire mounting.
It's going back Tommorrow asap in the morning.
James
10-08-06, 11:12 AM
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Apparently, both reports are by Bridgestone users. My Dunlops have no problems, after 4000 miles.