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angelfj1
Yoda
Offline
I am trying to chase down a severe vibration that has developed in the TR250. This occurs in the front end and at its peak it is difficult to hold the steering wheel steady. This occurs consistently in 4th gear between 3200 and 3700 rpm. I have an “A” type overdrive and 3.7:1 rear axel. Both the O/D and speedo are currently disconnected, so I can't be exact about the speed in mph. Let's just say between 60 - 70 mph. This is not a good speed to have a bad vibration. The vibration starts rather suddenly and disappears when speed increases to maybe 72-75 mph
We have pretty much eliminated the front suspension. Athough the rubber has not been replaced recently, everything is in fairly good condition. There is no unusual slop in any of the suspension. The steering rack is new as are the inner and outer tie-rod ends. The flexible steering column coupling is in bad shape and needs to be replaced as well as the upper and lower steering column bushings. This fact, i am sure is amplifing the symptoms.
We also checked the run-out on each AR wheel and they are all at about 0.020 axial.
It has been recommended that I get the wheels/tires balanced. I am running BF Goodrich, Silvertown Red Lines, 205/65 R15’s mounted on American Racing Silverstones. I took the tires mounted on the wheels to a tire shop today. They put the wheels/tires on their Hunter Engineering RoadForce machine. This balances the tires while simulating the force of the road pushing against the tire. See https://www.gsp9700.com/pub/features/how.cfm
I was told that they were able to balance all of the tires but that the RoadForce machine indicates that two of the four tires are out of specification.
Here are the results, which I do not understand.
before after
LF .024 .016
LR .045 .035 out of spec.
RF .081 .076 out of spec.
RR .007 .001
Spec. = 0.026 or less.
I guess I have to live with this for now. Should I put the "best" two tires on the front and the other two on the rear??
Anyone understand what all of this means? I sure don't.
We have pretty much eliminated the front suspension. Athough the rubber has not been replaced recently, everything is in fairly good condition. There is no unusual slop in any of the suspension. The steering rack is new as are the inner and outer tie-rod ends. The flexible steering column coupling is in bad shape and needs to be replaced as well as the upper and lower steering column bushings. This fact, i am sure is amplifing the symptoms.
We also checked the run-out on each AR wheel and they are all at about 0.020 axial.
It has been recommended that I get the wheels/tires balanced. I am running BF Goodrich, Silvertown Red Lines, 205/65 R15’s mounted on American Racing Silverstones. I took the tires mounted on the wheels to a tire shop today. They put the wheels/tires on their Hunter Engineering RoadForce machine. This balances the tires while simulating the force of the road pushing against the tire. See https://www.gsp9700.com/pub/features/how.cfm
I was told that they were able to balance all of the tires but that the RoadForce machine indicates that two of the four tires are out of specification.
Here are the results, which I do not understand.
before after
LF .024 .016
LR .045 .035 out of spec.
RF .081 .076 out of spec.
RR .007 .001
Spec. = 0.026 or less.
I guess I have to live with this for now. Should I put the "best" two tires on the front and the other two on the rear??
Anyone understand what all of this means? I sure don't.
