My dealer service guy has been doing a mod on cares that come in with the cupping/feathering issue. Apparently the car is nose diving too much under braking and hard turns. He supposes this is caused by an incorrect rear ride adjustment.

There are two ways to address this problem...stock and aftermarket.

Aftermarket involves a change to progressive springs/shocks.

Stock involves adding shims to the rear differential some where on the mounting thus reducing the rear ride height by several mm.

As soon as I have a chance to crawl under the car I will locate the shims and photograph them.

This fix is not NNA approved and I am not sure if it will have the desired outcome with regard to tire feathering.

I do know this one thing, with my stock suspension setup and my, 4 times on the rack, alignment with new shims, the extra understeer issue seems to be gone. This car now handles turns effortlessly with absolutely predictable performance. I plan on talking to the alignment guy and getting the whole story for anyone interested.

For now I am happy!

 

this is VERY VERY interesting. YES, please take pics and give as much info as possible!!!! THANX!!!

this could explain the theory that the coilovers solve the problem

 

That would be great if this is the deal after all.......now all i need is a tranny fix

 

Well took awhile to get back to this.

I found no shims- and in fact none where added. However, The car was placed on the Alignment rack no less than 4 times to set, check, repeat.

I also had new tires approved for all 4 wheels since all settings were whacked out. I had Michelin(french yuk-- but excellent)Pilot Sports put on at no extra cost. that was 4500 miles ago and absolutely no sign of foul wear or noise and these things glue me to road like nothing I have ever driven.

Push for them-- they make all the difference. And the dealer can put on whatever they want to. YUP! I am convinced that the bridgestone tires are pure crap.

 

Well took awhile to get back to this.

I found no shims- and in fact none where added. However, The car was placed on the Alignment rack no less than 4 times to set, check, repeat.

I also had new tires approved for all 4 wheels since all settings were whacked out. I had Michelin(french yuk-- but excellent)Pilot Sports put on at no extra cost. that was 4500 miles ago and absolutely no sign of foul wear or noise and these things glue me to road like nothing I have ever driven.

Push for them-- they make all the difference. And the dealer can put on whatever they want to. YUP! I am convinced that the bridgestone tires are pure crap.