Picked up my 1st SC today! Whooo! 2006 65,000 miles spotless inside and out I got for $26,500 black/ecru
Its a beauty and a dream to drive. I noticed over 60 mph it shimmies and feels funny. Do you think it is the run flats or just the way the suspension is?

Thanks,
Kelly
VRRMMM

 

Congratulations. I can tell you that after three months of ownership, the thrill is still there for me, so enjoy. I never had the run flats so I can't speak for them, but mine is as smooth as can be at any speed. I intentionally use the cruise control to limit my speed because 90 feels the same as 50. You gotta be carefull so get yourself a good radar detector.

 

I've got runflats and do not have the shimmies at any speed. Check some of the threads on runflats, they're very informative.

 

Congrats on your buy. I have 44,000 on my 2005 and I have Pirelli runflats. I do notice a slight shimmy at about 65mph but it is moderate. It is more noticeable with the top down. 70 and above and 60 and below, I'm solid as a rock, regardless of whether the top is up or down. It's not serious enough for me to put in the effort to try to get rid of the shimmy. I remember at least one other CL member describe slight vibration at 65 mph so I know I am not alone.

how does your car run at 70-80 mph ?

 

Hey, congrats on the new ride! I just bought an 07 and had it for 3 weeks so far. I can tell you that 99% of the shimmering is due to the Run flat tires, and I have made some threads about it here. After driving for a week, I changed to traditional tires (Bridgestone Turanza with Serenity) and everything changed. The ride is much more smoother, quieter, and the car doesn't shimmer. Hope this helps. Replace your run flats.

 

Congratulations and welcome to the forum.

Wide run flats and/or low profile tires tend to have flat spots that develop after sitting for a while (hours or overnight). Often the shimmy goes away after a few miles. For those that don't, get a road force balance done on your wheels/tires but have it done after driving several miles and make sure that they get the wheels/tires off the car very soon after you arrive at the shop so they don't have time to develop another flat spot.

Unfortunately, the shimmy is common and it typically shows up between about 50 to 65 mph. Good luck and let us know how it goes. (Also, post pictures of your new ride.)

 

Also look for cupping on one of your front tires. These wide tires cup easily (feel or look for scalloping) if you run a little under-inflated, and sometimes even if you are religious about tire pressure. I keep my tire pressure at what the tire manufacturer recommends for the load (vehicle weight) for that specific tire, rather than what Lexus says (which technically is valid only for the exact original fitment). If you find one that is cupped sometimes you can 'fix' the cupping a bit by rotating it to the rear and increasing the inflation a few pounds.

 

Topic reminded me of this: (0:53 to be exact lol)
http://www.youtube.com/watch?v=jtlas...eature=related

 

He pretty much hit the nail on the head, also make sure to get the wheels balanced, preferably by a shop that has a road force balance machine


the two main causes of vibration at that speed are the tires or the balancing

 

Thanks everybody.
This car is a dream!