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Re: Thanks for the Links.... very useful Posted by CrNiFe [Email]  (#408)  [Profile/Gallery]
(more from CrNiFe) on Thu, 21 Aug 2008 09:07:32
In Reply to: Re: Thanks for the Links.... very useful, steve, Wed, 20 Aug 2008 22:29:11 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Steve,
yes, I can confirm that normal extended usage under load leads to feathering and eventually cupping on the inside edge of the rear tires. Last year I actually measured the load with a scale when we got back.
My alignment was tested and adjusted after my first occurrence. It was very close to being within spec. I requested shims to bring camber more positive, but met with resistance at the dealer from the tech, so I just asked to have it within specification for camber and toe, with no load!
On the MY99 SW Linear, the rear struts were changed but I did not do the rear springs. Perhaps we should have the suspension tested when the cars are at their rated load!
I do see the feathering issue, but to a greatly reduced extent, on the MY05 SW, which is an Arc (slightly altered suspension). Note that I have exactly the same type of tires National Ovation 215/55 R16 on both vehicles.
I keep the rear pressure at 36 p.s.i., even for around town driving.
I saw two other 9-5 SW in a parking lot, and being the curious engineer that I am, walked over and put my hands on the inner rear tire edges. Both had feathering. One was a 2001 and the other was a 2005, based on the trim and headlights. And I watch one of them drive away, with a full load, with the rear dropped just like my MY99.
I see BMW and AUDI wagons with a similar set-up, visually, and they too seem to have the feathering on the inside. Too busy to notice?
I often wonder if it is just the extra weight of the back of the wagon (from the C-pillar back), including the tailgate, that puts us out of the camber specification when we load the rear portion, reducing the available cargo capacity. Maybe the wagon camber specification should be adjusted to reflect the fact that the rear drops by about 1.25 inches when loaded with suitcases and gear.
Incidentally, I do try to balance the weight side to side and front to back in the rear, and in the Thule box on the roof.
Like I said, I cope by running higher pressures and rotating often. The tires do eventually get noisy, but that is usually after 50000 km anyway.
Regards,
CrNiFe
Toronto
, Mon, 18 Aug 2008 22:10:42, Wed, 20 Aug 2008 13:56:31, Thu, 21 Aug 2008 09:07:32 <-- Viewing This Message, Wed, 20 Aug 2008 22:44:41, Thu, 21 Aug 2008 08:11:57, Thu, 21 Aug 2008 13:11:37, Mon, 18 Aug 2008 22:32:52, Mon, 18 Aug 2008 22:42:08, Mon, 18 Aug 2008 22:56:15
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