very odd suspension behavior ('95 C4)
02-09-2009, 09:49 AM
#16
Interesting. I've heard of similar symptoms in lifted Jeeps called "death wobble", but it's normally caused not completely taking care of all the things necessary to properly lift a Jeep 3+ inches. Gets lots of things out of alignment and many people try to do it on the cheap. Can't imagine what it'd be on a Porsche aside from what others have suggested with the tie rods, control arms, and finally ice/snow buildup.
I would do some real inspecting of all front stering and suspension connections in the OPs case. Could be ice, but that sounds like an odd one to me.
02-09-2009, 08:09 PM
#17
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Thread Starter
Shocks don't seem too bad, actually, despite their age. No bounce, just nice damped response. And I flog her pretty good around pretty bumpy curves almost every day with no loss of confidence. And I'm pretty sure the shimmy I'm experiencing wasn't brought on by a bump.
Perfect today (3 straight days of warm weather). If it happens again when it cannot be ice, I'll have the pros take a look - everything seemss right to me.
Perfect today (3 straight days of warm weather). If it happens again when it cannot be ice, I'll have the pros take a look - everything seemss right to me.
03-03-2009, 10:50 PM
#19
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Thread Starter
Alright, it's happened twice more (5 times total), all times the day after the car has seen some snow/ice/slush. All times I can stop the car for a minute or two and drive off and it's fine for some time (many days...)
So while it still could be ice, it seems unlikely that it would happen so often. I'll let the pros look her over see what they can find. Keep you posted.
So while it still could be ice, it seems unlikely that it would happen so often. I'll let the pros look her over see what they can find. Keep you posted.
03-04-2009, 11:30 AM
#21
Drifting
03-04-2009, 12:23 PM
#22
Wallflower
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03-04-2009, 12:54 PM
#23
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Ahhh...Ice forming inside your tire from the miosture in the tire.
At cold temps the moisture condenses and refreezes in a lump at night. In the morning after driving 10to 15 minutes the tires warm up enough to let it loose. Then you stop and the water melts and evenly distributes.
At cold temps the moisture condenses and refreezes in a lump at night. In the morning after driving 10to 15 minutes the tires warm up enough to let it loose. Then you stop and the water melts and evenly distributes.
03-04-2009, 12:56 PM
#24
Seared
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Ahhh...Ice forming inside your tire from the miosture in the tire.
At cold temps the moisture condenses and refreezes in a lump at night. In the morning after driving 10to 15 minutes the tires warm up enough to let it loose. Then you stop and the water melts and evenly distributes.
At cold temps the moisture condenses and refreezes in a lump at night. In the morning after driving 10to 15 minutes the tires warm up enough to let it loose. Then you stop and the water melts and evenly distributes.
Andreas
03-04-2009, 04:22 PM
#26
Race Car
So, maybe re-routing the SAI valve to the tire valves could work. On startup, the SAI pump will flush any water buildup in the tires and refill them with air at the same time.
03-04-2009, 05:19 PM
#27
RL Technical Advisor
I deplore doing things twice,...
03-04-2009, 06:49 PM
#29
Seared
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Andreas
03-04-2009, 07:47 PM
#30
Drifting
None of you guys are allowed to work on my car. 
I've never heard of ice inside the tires but the humidity is low here. You would think that the ice would be distributed and not affect balance. Mechanical looseness can cause inconsistent vibration. You would think the tires would be worn if it was plain front end wear.
I've never heard of ice inside the tires but the humidity is low here. You would think that the ice would be distributed and not affect balance. Mechanical looseness can cause inconsistent vibration. You would think the tires would be worn if it was plain front end wear.