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post #1 of 14 (permalink) Old 06-09-2004, 03:38 PM Thread Starter
Johnny Bling Bling
 
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oversize and balance

techically speaking, an oversize tire should still balance out, right? i mounted 245-60-15 on my 6.5 rims. i balanced them myself(i know how), but the other day i was on the highway, and once i hit 75, the whole steering wheel had a seizure. was fine once i lowered speed, and is fine around town, but everytime i hit that plateau and higher...nasty vibration.

2003 Ford Expedition: 5.4L, harley supercharger, 2.93 upper pulley, 4lb lower pulley, c&l plenum, jlp cai, LFP SBTB, FTSP, Magnaflow 3" catback, Eclipse AVN-5510, white face gauges, cobalt c2 boost gauge, ddm hid's, 379 rwhp, 465 rwtq sold 11/3/12

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post #2 of 14 (permalink) Old 06-09-2004, 04:01 PM
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Tire size does not affect balencing. Heck, I put some 225/50s on a 6" wide rim and they were great (smooth all the way upto 156mph)

Either the tire has a defect, or you made a mistake when balencing.

Did you put the valve stem closest to the yellow lug?




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post #3 of 14 (permalink) Old 06-09-2004, 04:06 PM Thread Starter
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well, i'm gonna rebalance them myself tonight. i will try that yellow lug thing. never checked, just installed.

2003 Ford Expedition: 5.4L, harley supercharger, 2.93 upper pulley, 4lb lower pulley, c&l plenum, jlp cai, LFP SBTB, FTSP, Magnaflow 3" catback, Eclipse AVN-5510, white face gauges, cobalt c2 boost gauge, ddm hid's, 379 rwhp, 465 rwtq sold 11/3/12

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post #4 of 14 (permalink) Old 06-09-2004, 04:12 PM
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sometimes its the wheel that causes this, if so the wheel needs to be replaced
but this is not likely since this is not common

-Orlando

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post #5 of 14 (permalink) Old 06-09-2004, 04:46 PM Thread Starter
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just rebalanced. i messed up. there is a backspace measurement that i forgot to set. oh well, live and learn. will check it tomorrow night on way to fudds. tried that yellow lug thing, but the yellow paint was worn off of 3 of the 4 wheels. i matched the one up that i could.

2003 Ford Expedition: 5.4L, harley supercharger, 2.93 upper pulley, 4lb lower pulley, c&l plenum, jlp cai, LFP SBTB, FTSP, Magnaflow 3" catback, Eclipse AVN-5510, white face gauges, cobalt c2 boost gauge, ddm hid's, 379 rwhp, 465 rwtq sold 11/3/12

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post #6 of 14 (permalink) Old 06-09-2004, 05:00 PM
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The biggest drawback with our 15" rims is you can't get a VR rated tire because of the sidewalls. So to go with a 60 series tire is the only answer with our 15"ers. But you can't match stock hight 26.9" because the tire is too fat for the front. It will work, but the ride gets mushy and I've heard it rubs some. Too much sidewall, With the 60 series the 235 fits, 26" dia, but you need good sidewall construction. Stock replacements don't cut it. BF goodrich T/A,s are a big improvement. But it's still an SR rated tire. So I too have some vibaration. Real smooth from 0-65 slight up and down steering wheel shake from 65-78, then it hammers down from 80+. My car's lowered with the 1-1/4 bars. Brand new front end. The ultimate solution is to do the 17" rim.
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post #7 of 14 (permalink) Old 06-13-2004, 08:20 PM Thread Starter
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well, i rebalanced them as previously stated. i have now had the chance to take on highway. 100% better than it was, but not 100%. follow? car still shakes, but not nearly as bad. all the wheels look straight. maybe i will rotate front to back and see how that goes.

2003 Ford Expedition: 5.4L, harley supercharger, 2.93 upper pulley, 4lb lower pulley, c&l plenum, jlp cai, LFP SBTB, FTSP, Magnaflow 3" catback, Eclipse AVN-5510, white face gauges, cobalt c2 boost gauge, ddm hid's, 379 rwhp, 465 rwtq sold 11/3/12

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post #8 of 14 (permalink) Old 06-13-2004, 09:48 PM
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check your front suspension

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post #9 of 14 (permalink) Old 06-14-2004, 07:56 AM Thread Starter
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my car has been pretty much rebuilt from bottom up....i work for the big, bad dealership, and almost all work is free.

2003 Ford Expedition: 5.4L, harley supercharger, 2.93 upper pulley, 4lb lower pulley, c&l plenum, jlp cai, LFP SBTB, FTSP, Magnaflow 3" catback, Eclipse AVN-5510, white face gauges, cobalt c2 boost gauge, ddm hid's, 379 rwhp, 465 rwtq sold 11/3/12

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post #10 of 14 (permalink) Old 06-14-2004, 11:22 AM
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might be the wheel that ain't good anymore

must be nice to work at the dealership....

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post #11 of 14 (permalink) Old 06-14-2004, 01:59 PM Thread Starter
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Quote:
Originally posted by mn12xr7
must be nice to work at the dealership....
it is, but the downside is that i have to wait until there is no paying work left to be done. once it is, i can bother the techs......and i do!

it's also good because i can help out my local tccoa boys and girls whenever i can. rodeo joe knows all about that!

2003 Ford Expedition: 5.4L, harley supercharger, 2.93 upper pulley, 4lb lower pulley, c&l plenum, jlp cai, LFP SBTB, FTSP, Magnaflow 3" catback, Eclipse AVN-5510, white face gauges, cobalt c2 boost gauge, ddm hid's, 379 rwhp, 465 rwtq sold 11/3/12

2009 Ford Flex Limited AWD
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post #12 of 14 (permalink) Old 06-14-2004, 05:11 PM
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Sometimes you have to figure out what it isn't, before you know what it is. First, rotate the front with the back, but check the rims this time. If one is bent, just a little, that's a clue. If things get better or worse, then that points to tires. Now, one thing that has not been talked about. Shocks! If just one is bad, small bumps on the highway will make the tire bounce. Resulting in a steering wheel that can't wait to slow down. Plus tire contact with the road is reduced. Now raise the car up and look at each shock. When they leak, dirt collects on the leak. If they are just plain old, then replace them. If not, assume they are in pretty good shape. Also, take it to the shop and have them check out all four coners. Estimates are free. Ed.
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post #13 of 14 (permalink) Old 06-14-2004, 05:51 PM
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Quote:
Originally posted by Hollywood Ed
The biggest drawback with our 15" rims is you can't get a VR rated tire because of the sidewalls. So to go with a 60 series tire is the only answer with our 15"ers. But you can't match stock hight 26.9" because the tire is too fat for the front. It will work, but the ride gets mushy and I've heard it rubs some. Too much sidewall, With the 60 series the 235 fits, 26" dia, but you need good sidewall construction. Stock replacements don't cut it. BF goodrich T/A,s are a big improvement. But it's still an SR rated tire. So I too have some vibaration. Real smooth from 0-65 slight up and down steering wheel shake from 65-78, then it hammers down from 80+. My car's lowered with the 1-1/4 bars. Brand new front end. The ultimate solution is to do the 17" rim.
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post #14 of 14 (permalink) Old 06-14-2004, 06:22 PM
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One of my stock rims on the '96 was bad from the factory. It was out of round. When I went to get tires the first time, the tire place would not warranty the tire on that rim. I went back to Ford and they told me "yes, the rim is off, but it is within factory tolerance." Fortunately I had a good relationship with the service writer and he got me a new rim. So that is a possibility. Check to see if they are bent or if one or both of them is out of round.

How did the car ride before you put the new tires on?? if it didn't shimmy then, I would say it's the tire.

Recheck the balance. Sometimes while you're leaning over the tire to put the weight on the back, the tire moves a bit on the balancer and the spot where you put the weight is not quite right... I've seen that happen often.. but if you re-spin it and the machine says it's balanced then it's balanced.

Swapping tires front for rear should give you some feedback.

There are several things it could be if the balance is right and the rims are not bent or out-of-round and the suspension is solid.

The tires can be out of round, or can have a bad belt...

Recently, the '95 suddenly developed a horrible steering wheel shake at about 73 - 77 MPH and higher. I thought it was the driveshaft, or suspension. I was due for tires so I got a new set of tires put on.. and like magic, the shimmy went away.. So if all else is right and the tires and wheels are right, the shimmy should go away. You shouldn't have to settle for less..

-mike

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