Carrera Sport Wheels - Center Cap Failure!
03-08-2009, 03:44 PM
#17
Drifting
I suggest you do the same trip in reverse direction to bring your caps back into alignment.
I too took a similar trip last August, from The OC to Vancouver and back. I agree that I-5 is a total bore. I use a portable XM radio to address the monotony. I found the coarse road surface in Oregon to cause deafening tire noise, and a radar detector is very useful in Oregon and Washington in my experience. I returned via Hwy 97, and some mountain roads, and had a ball. I put on over 900 miles on my final leg from Bend Oregon to OC, and was totally comfortable.
Your video clip brings back fond memories of that trip. Everyone should take their P-cars on a long trip on interesting roads. It is a major bonding experience.
I too took a similar trip last August, from The OC to Vancouver and back. I agree that I-5 is a total bore. I use a portable XM radio to address the monotony. I found the coarse road surface in Oregon to cause deafening tire noise, and a radar detector is very useful in Oregon and Washington in my experience. I returned via Hwy 97, and some mountain roads, and had a ball. I put on over 900 miles on my final leg from Bend Oregon to OC, and was totally comfortable.
Your video clip brings back fond memories of that trip. Everyone should take their P-cars on a long trip on interesting roads. It is a major bonding experience.
03-08-2009, 04:38 PM
#18
Lack of the proper amount of grease on the muffler bearings will cause an additional amount of vibration on the car.
Since this vibration begins at the back of the car, the impact of the vibration is greater on the rear wheels that it is on the front wheels because the vibration gets dissipated as it moves forward on the car. The difference in vibration levels, front and back, is what is causing the center caps to rotate at a rate that is directly proportionate with the vibration frequency.
Have the dealer repack the grease bearings in the mufflers and you should be good to go!
Since this vibration begins at the back of the car, the impact of the vibration is greater on the rear wheels that it is on the front wheels because the vibration gets dissipated as it moves forward on the car. The difference in vibration levels, front and back, is what is causing the center caps to rotate at a rate that is directly proportionate with the vibration frequency.
Have the dealer repack the grease bearings in the mufflers and you should be good to go!
03-08-2009, 07:05 PM
#20
Rennlist Member
Try Nitrogen in the tires. 79% N2 is not enough to keep most center caps properly oriented especially on a Porsche.
03-08-2009, 07:13 PM
#21
Three Wheelin'
I actually had the dealer order me a set of Porsche Carbon Fiber "Gravity Drops" which fit on the inside corner of the Caps. These little guys make sure the Caps are always horizontal and being light don't affect the unsprung weight. They come in sets of 5 (smart in case you lose one) and cost $70 for the set of 5.
03-09-2009, 09:24 PM
#22
all the above answers are wrong. The correct answer has to do with the shape of the road, which is higher in the center and lower near the curb, As a result, there is more weight on the outside wheels, which means more heat, This expands the wheels and according to the well know equation below, the outside wheels turn faster and throw the center caps out of alignment
