Ridin Dirty

I think I know the answer to this.....but just bouncing it off you guys.

Strange? steering wheel wobble/bounce that is directly proportionate with ambient temp.... the colder it is the worse it gets.
*40 degrees F or below... it's so pronounced it can be visually appreciated by the passengers.
*75 degrees F and above.... no visual wobble and barely tactically perceptible by driver

again i think i have an idea....but I'm not the best shady-tree....any thoughts?

Bradford

Have you replaced your front control arm bushings? Common problem with our cars.

Ridin Dirty

Thanks....probably...in fact it's the whole oem suv U.S. suspension STILL in place from new......think it's time for pss10's

Knight

If the bushings, it's interesting that it happens at colder temps. Wanna also mention tire pressures and of course age/type of tires too.

If your going to upgrade the suspension check your tie rods too.

Ridin Dirty

Thanks....new tires all around this summer......but its definitely temp dependent....i think that rules out tires/wheels.....has to be a bushing?....

drove it to work early this am bouncing all over the place...i'll drive it home (going to be 65 degrees F then) and it will be barely noticeable.

.....idk that is so odd tho.

Knight

I had worn bushings in mine for years and drove the car during colder temps, the only times I had vibrations were at higher speeds during 993Fest. And I know some had complained of vibrations at only certain speeds like 60mph range etc, never heard of it temp dependent.

Basal Skull

If temp dependent, I'd be suspicious of the tires or bent wheels. In the colder weather, if you drive for a long time (i.e. Tires warm) does it get better? (Softer tires will make minor bent wheels seem okay)

Ridin Dirty

Gotcha...I wonder how i can heat up the tires tho

golfnutintib

tire flat spotting perhaps

Ridin Dirty

....just as expected later in the day with warmer temps (was beautiful actually over 70 degrees in November is amazing) and no vibration/gone. My fair-weather 993...geez

LexVan

What tire's are you running? What are your cold tire pressures?? Increase all tire's 2 psi and report improvements and changes.

Your tire's are temporarily flat spotting. The increased tire pressures will help/resolve issue. Try 36 front and 40 rear.

Ridin Dirty

sure i will......i hope your right

pretty aggressive sizes:

315/25/19
255/30/19

on Rufs with proper spacers

......completely asymptomatic over the summer with the new tire install was kinda shocked actually almost asking for trouble with such small sidewalls and then throwing spacers in the mix etc.....so I was actually shocked at install when they rode great...all summer too. hhhhhmmmmm.

ronnie993tt

+1. Mine do this too if the car is parked for even a week. It's worse the colder the weather gets but goes away as car is driven. Parking on foam tiles will eliminate it.

pirahna

I have had flat spotting after just a couple of cold days with both Sumi's and Bridgestone S02a's. Didn't notice the same problem with PS2's. The flat spotting usually goes away after about 10 miles or as the temps rise.

997rs4.0

Try bumping up the tire pressures. My 993tt sits for weeks sometimes. Michelin PSS. Flat spotting.