Front End Vibration
Thread Starter
Instructor
Joined: Aug 2007
Posts: 215
Likes: 0
From: NEWPORT NEWS VA
Front End Vibration
When First Starting Off From 40mph On Up For About 5-10 Miles The Front End Vibrates Like The Wheels Are Out Of Balance But Their New ,wheels And Tires. Anyway It Gets Better After About 10 Miles Or If I Go Into A Turn Loading Up The Front End. My Car Has About 113k On It The Motor Is Fresh, But Back To My Problem
I Think My Wheel Bearings Are Shot But You Cant Feel Anything When Its Jacked Up In The Garage What Do Think Any Input Would Be Helpful I Know My U-joints Are Shot Too And Soon To Be Replaced But They Have Nothing To Do With The Front Thanks
I Think My Wheel Bearings Are Shot But You Cant Feel Anything When Its Jacked Up In The Garage What Do Think Any Input Would Be Helpful I Know My U-joints Are Shot Too And Soon To Be Replaced But They Have Nothing To Do With The Front Thanks
Racer
Joined: Jun 2006
Posts: 408
Likes: 0
From: Elkton MD
Cold vibration
Look at the sidewalls of your tires to find the belt type. Often there are two steel radial belts and one polyester and one nylon sidewall belts. The nylon belt suffers 'creep' or flat spotting that goes away after 7-10 miles of running.
I have a set of Goodrich's that vibrate a little after sitting overnight. One of my kids bought a new accura and couldn't eliminate the cold vibration. He couldn't believe they'd put such tires on a new car - but they do.
The nylon sidewalls give very good performance if you can overlook their creep.
Good luck.
I have a set of Goodrich's that vibrate a little after sitting overnight. One of my kids bought a new accura and couldn't eliminate the cold vibration. He couldn't believe they'd put such tires on a new car - but they do.
The nylon sidewalls give very good performance if you can overlook their creep.
Good luck.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
I never heard of sidewall creep but your tires are flat spotting and after you drive for awhile the tires warm up and the flat spot is ironed out by heat and pavement contact. It will be worse in cold weather.
Drifting
Joined: Sep 2003
Posts: 1,363
Likes: 7
From: 1994 LT1 Coupe 6-speed with FX3 & 2000 LS1 Vert 6-Speed with F45 Hunterdon County, NJ
33 PSI COLD & Cardboard under tires
catlettlt1,
What COLD tire pressure are you using? What type of ground surface do you park on overnight?
Our experience with our 94 with OEM Goodyear run-flats is the minimum pressure should be 33 PSI COLD (meaning after car sat overnight).
Otherwise the pressure seemed to be insufficient to cause the tire to run on the tread -- instead it was running on the side wall, which made the ride rough (and the different between 30 and 33 was amazing). The increased pressure also seemed to reduce flat-spotting (what you may be experiencing).
We also started putting a piece of cardboard under the tires where we park in the garage (on cement), which also made a big difference and completely eliminated the flat spotting (car typically sits 1-2 weeks between drives). My speculation is that since the cement doesn't change temperature as much or as quickly as the tire rubber, it insulates the tire rubber, allowing for the subtle expansion/contraction to occur in the tire rubber without being 'held back' by the cement.
What COLD tire pressure are you using? What type of ground surface do you park on overnight?
Our experience with our 94 with OEM Goodyear run-flats is the minimum pressure should be 33 PSI COLD (meaning after car sat overnight).
Otherwise the pressure seemed to be insufficient to cause the tire to run on the tread -- instead it was running on the side wall, which made the ride rough (and the different between 30 and 33 was amazing). The increased pressure also seemed to reduce flat-spotting (what you may be experiencing).
We also started putting a piece of cardboard under the tires where we park in the garage (on cement), which also made a big difference and completely eliminated the flat spotting (car typically sits 1-2 weeks between drives). My speculation is that since the cement doesn't change temperature as much or as quickly as the tire rubber, it insulates the tire rubber, allowing for the subtle expansion/contraction to occur in the tire rubber without being 'held back' by the cement.
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