Vibration over 110kmph after raising pressure.
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Vibration over 110kmph after raising pressure. - 4/28/2008 9:03:50 AM
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Smoked
Posts: 198
Joined: 3/17/2008
Status: offline
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Howdy.
I bought my 99 zr2 just over a month ago. It has some 31x10.5 tires which were in good shape as far as remaining tread, and they obviously passed the safety. Now i've never driven in a vehicle with tires this big, but i was told they would make more road noise..which makes sense...than a standard tire. I would have though the noise would be uniform, but to me it's rotational...what I mean by that is it sounds like it's a noise produced every time the tire(s) pass a certain point and then not again until that point returns. Does that make sense?
Anyways, with the pressure set as they were when i took possession there were no vibrations at highway speeds. As part of my spring tuneup I checked the pressures and they were all around 32 but uneven...so one would be 30, the next 33, the next 31 that sorta thing. I like to run my vehicles at 35 for fuel economy so i put them all up to 35 using my own pump and guage which i know to be accurate.
I still had the same noise during normal driving but as soon as I got up to 110kmph + on the highway i had a vibration I could feel in the wheel, but the whole truck shook to a degree. I had this once before with my 89 Jimmy so i decided to leave them at 35 and drive around city for a few weeks to wear them in to that new pattern and test again this past weekend, my next trip requiring highway driving.
By a stroke of bad luck i had to get my oil flushed out on thursday and they went and changed my tire pressure while they were at it. I asked for 35. Anyways, onto the highway friday and the vibration was still there over 110kms. I checked them the next day and they were again all over the place, 30, 31, 31 and 34 psi. I should never have let them touch it. Not having any way to get air into the tires, i lowered them to 30 for the drive home. It was better but still had vibrations over 110kmph.
What should I do? I'm just not familiar with large tires and what noises they should be making. I know it shouldn't vibrate at highway speeds just because they're bigger.
Is there anything I can do...any tests I should put them through at a tire shop?
thanks!
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99 Blazer Zr2 4x4 automatic.
94 Camaro z28 6spd. 332rwhp/332rwtq
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RE: Vibration over 110kmph after raising pressure. - 4/28/2008 11:49:08 AM
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Zed
Posts: 164
Joined: 8/29/2007
From: Niagara ON Canada
Status: offline
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I have basically the same problem , small vibration over 110 mph with my 01 BlaZeR2 , I am thinking maybe a hub/bearing ?
BTW , does it with the winter & summer wheels and tires , both sets are BFG AT's so I doubt it's the tires ?
Zed
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My Trucks & Toys <<Clicky
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RE: Vibration over 110kmph after raising pressure. - 4/28/2008 12:18:27 PM
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cliro
Posts: 1209
Joined: 10/11/2007
From: Calgary, AB
Status: offline
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go get your tires balanced.
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2004 GMC Jimmy
4x4, 2dr.
metallic cherry red.
.net instead of .com (better)
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RE: Vibration over 110kmph after raising pressure. - 5/7/2008 8:40:44 PM
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a_tack
Suspension Tech Moderator
Posts: 1287
Joined: 4/5/2006
From: Ashland, Kentucky
Status: offline
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quote:
ORIGINAL: Zed
I have basically the same problem , small vibration over 110 mph with my 01 BlaZeR2 , I am thinking maybe a hub/bearing ?
BTW , does it with the winter & summer wheels and tires , both sets are BFG AT's so I doubt it's the tires ?
Zed
110 MPH? did you reprogram your CPU or something because most blazers die just under 100MPH.... he said 110 KMPH which is approximately 68.4 mph..... now of course a ZR2 Blazer is gonna vibrate a bit at 110MPH.... but at 110KMPH/68.4 MPH the vibration could be attributed to poor balance or alignment... my 30" tires were doing the same thing... turned out I threw a weight off-road. But mine hold good air pressure... get them balanced..
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-Aaron
"Wherefore, my beloved brethren, let every man be swift to hear, slow to speak, slow to wrath." -James 1:19
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