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jmartynuska | RR Tire Hop/Rapid wear | ||
Guru
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I've been chasing a bad vibration/tire hop in the rear. Put tires on it mid-January. Fronts look brand new, rears are smooth.
Think this could be the cause, or most of it? RR Lower Dogbone mounting hole |
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Posted on: 2010/4/13 19:43
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Andrew | Re: RR Tire Hop/Rapid wear | ||
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Could it be because of:
http://www.youtube.com/watch?v=FAx7lDNmcmQ Seriously, I've never seen what you posted. How bad is the vibration? I would think if it was the dogbone mounting hole, it would shake like crazy. |
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Posted on: 2010/4/13 20:41
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BillH | Re: RR Tire Hop/Rapid wear | ||
The Stig Moderator
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Need more info. Vibration and tire hop are really 2 different things.
Vib - when, what speed, under acceleration, deceletation? Tire hop, again when? Hard launch, around corners? The only thing in your vid that I can think of that would cause that is a bolt that wasn't tightened properly. It had to be working on the holes for a while to do that. |
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Posted on: 2010/4/13 21:03
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jmartynuska | Re: RR Tire Hop/Rapid wear | ||
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Real bad.....
Top hole is similar. The sleeve in the bushing the bolt passes through has a similar elongation, more so on the bottom bushing than the top. |
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Posted on: 2010/4/13 21:08
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jmartynuska | Re: RR Tire Hop/Rapid wear | ||
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Vibration increases with road speed. What I think the "vibration" is - maybe my description isn't very good and may be misleading - is the tire either shaking back and forth or hopping up and down like a basketball.
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Posted on: 2010/4/13 21:12
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BrianCunningham | Re: RR Tire Hop/Rapid wear | ||
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chicken vs egg, which came 1st?
fortunately those brackets unbolt, good time to upgrade to DRM brackets if you want to. how the rest of it look, u-joints etc? |
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Posted on: 2010/4/13 21:17
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jhammons01 | Re: RR Tire Hop/Rapid wear | ||
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If you can see it hopping like a basketball, how old are the shocks?
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Posted on: 2010/4/13 21:23
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jmartynuska | Re: RR Tire Hop/Rapid wear | ||
Guru
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When I got the car, this is what happened to the RR outer u-joint...
RR Outer U-joint I suspect that's when a lot of the problems began. |
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Posted on: 2010/4/13 21:23
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jmartynuska | Re: RR Tire Hop/Rapid wear | ||
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I can't see the tire hopping - I'll try to get someone to follow me or drive beside me and look at it. I sure does feel like the tire is moving a lot. The wear pattern was feathered across the center tread blocks.
U-joints are new, within the past year, both outer tie rod ends with in the last two months. Shocks passes a basic push test and show no signs of leakage. I know, not real accurate or scientific, but the shock doesn't feel especially worn. I'd think if the shock was bad enough to be the sole cause, it would be noticeable with a basic push test. Rebound adjuster - Koni single - still functions in that I can see a change in extension when I fiddle with the knob. |
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Posted on: 2010/4/13 21:30
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BillH | Re: RR Tire Hop/Rapid wear | ||
The Stig Moderator
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Have you checked the rear wheel bearing for play, should be done with the caliper off and a dial indicator but, if there's any movement in and out it ay be bad.
Have you checked the wheels for runout, lateral & radial? This can be done with a pointer C clamped to a jackstand, check at the edge of the rim and on the bead edge (for up & down). Or, if the car's drivable, switch tires side to side. Bad shocks will amplify the problem but probably not cause it. |
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Posted on: 2010/4/13 21:39
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jmartynuska | Re: RR Tire Hop/Rapid wear | ||
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Sorry, rear hubs are two weeks old. This is the second wheel/tire combo this has happened to. These tires were mounted up on these wheels when I changed the tie rod ends. I was hoping the new tie rods ends had cured the problem.
I do notice a difference with the tie rods and hubs. I think just about every part in the rear is going to be replaced before all is said and done. Each part replaced makes a difference - new tie rods, car stopped wandering on accel/decel, new hubs, roughness and noise went away. I know it needs a new pinion yoke - I have one sitting in the garage from Randy's R&P. Sorry if I'm omitting a lot of details - been frustrated for a while with this. Thanks for the help and suggestions thus far...much appreciated..... |
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Posted on: 2010/4/13 22:04
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