Had a little steering wheel wobble on the lobster claw 19" wheels. Put some new Team Dynamics 18" with new tyres on and the wobble is still there.
Got a little worse over this last couple of weeks so went back and got the front wheels/tyres balance/checked. 35grms out on one, 10grms the other!
Put them back on and the wobble is worse and happens 10mph lower now.
Even at about 30mph on straight smooth road without touching the steering wheel, it is noticeable that the steering wheel wobbles slightly although it can't be felt.
At 64mph there is a light vibration through the car and the steering wheel wobbles about 1/4".
I've checked the wheel runout (warp) and one is 1mm the other 0.25mm. The discs are not warped, the wheel bearings are good.
Replaced the lower control arms both sides on front about 8,000 miles ago.
When one wheel is jacked off the floor and the wheel/tyre is pulled/pushed at 9 and 3 o'clock I can't feel any slack or knocks on the front steering/suspension, only movement of the steering wheel can be seen.
Should this happen if the other front wheel is on the deck? Worn rack?
What can it be?
I would strongly suggest you have the tires road force balanced (Porsche recommended by the way) if you haven't done so. Doing so has resolved quite a few problems that plain old spin balancing just can't deal with. It's a relatively inexpensive first step. If that doesn't help then it sounds like you may have a suspension issue of some type. Keep us posted.
I would replace the thrust puck on all four LCA's with a solid Tarett adjustable thurst puck. While you are doing this, your lower control arms are off, replace the inner and outer LCA's bushings with a little stiffer bearing material. I changed my LCA's to Tarett Cup LCA's to gain more track width and camber, not knowing how this modification would change my steering. I had steering wobble as well, even with new forged monoblock light weight wheels and new RE71R's.
These LCA's fixed that and much more. I was able to add 6 minutes of toe out in front, which does not change much under threshold and trail braking, for quicker turn in of the 255/35/18 fronts. Mid corner thottle modulation is excellant as well. Cantrell Motor Sports, my install shop, said the axles can move forward and back, as much as 2 1/2 inches all the while changing the toe and camber. So, these arms are really the foundation of the suspension system.
You may want to read about the result of another 987 owner who installed the Tarett Cup LCA's, JRZ shocks, Tarett GT adjustable swaybars on his R. His thread by djm68 is in the 987 Modification section titled " is this what the slippery slope looks like?" on menu page 3. Below is a picture of front tire rub caused by forward wheel motion (picture rotated). In the rear, the Tarett through bolt connecting the down link sliced into my OEM LCA from backward motion during braking.
After replacing the OEM LCA's with the Cup LCA's, no wobble, no axel movement f or r, improved turn in, throttle modulation, trail braking and weight transfer side to side (wider track).
Sorted! Back to minimal/no wobble by first trying the original wheels....loads better.
Then the new wheels back on swapped over...massive difference! Don't ask how.Can't have been seated properly last fitment. Or directional wear!
I'm getting 4 wheel alignment done Friday. I just wanted to make sure there was nothing obviously worn that would waste the alignment.
The car's been 4 wheel aligned 2 years ago and 7 years ago!
Thanks for the responses.
