11-20-2011, 10:15 AM | #45 |
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Looks like your initial settings were not really far enough off to be causing the tire wear you were seeing, especially at the front. The setting tolerances are very tight, but a camber change of -0.1 to -0.4 (LF) and -0.7 to -0.5(RF) is really insignificant. The rear camber changes are slightly more significant, but still not major changes. The settings of -1.4/-1.5deg. on the rears will slightly improve handling at the cornering limit, but will have little effect in normal driving and may actually increase the inner tire edge wear.
The front caster settings mostly affect steering feel and self-centering at high speeds and changes of one degree or so will have little or no effect on tire wear. the reason they didn't get the caster setting exactly the same is because they're set with a combination of adjustments and the installation of "shims". This limits the "resolution" that can be achieved. In addition, removing the vehicle from the alignment rack and then re-installing it will give different indicated readings. The repeatability of the measurements has a wide enough error range that there is no point in trying to make very fine adjustments. Hope your tires wear better now, but from the measurements, especially at the front, there does not seem to be an "alignment-related" reason for such severe wear. Of course, I'm no expert, particularly about small alignment errors and their interaction with run-flat-tires. The much stiffer sidewalls may make them much more sensitive to tiny alignment errors. Who knows? |
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11-20-2011, 04:52 PM | #47 |
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Thanks for the info.
So, now I'm in that funky territory of trying to figure out if there's something amiss or if I'm thinking too much about the car. The steering wheel is dead solid up to 60 mph or so except for road defects. From about 70 to 80 a vibration occurs. Not like the steering wheel moves or my fillings feel like they're falling out, just a vibration I can feel via the steering wheel. Wouldn't think a thing of it driving another car, but since it's not there at lower speeds and those last tires were trashed, I end up wondering if it's right. Y'all have that feeling in the steering at higher speeds?
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11-20-2011, 09:43 PM | #48 |
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Drives: 2022 X4M40i, retired ‘11 X3
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No vibration at any speed up to 90mph so far.
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06-23-2014, 06:05 PM | #49 | |
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