Southbranch

From Tire Rack's page about breaking in your new tires:

Penn4S

New tires should not feel "squirmy" regardless of the film that some are saying needs to be worn off. But high tire pressures, 48 psi, like that will definitely cause the car to float and catch ruts, etc..... Try lowering the pressures and see if the change is immediate.

ejlif

thanks to all the advice. I haven't had a chance to drive it yet but am going to lower to 38 PSI and will report back. Thank you!

dannyss

38 is what I run in the summer when tires are hot. If cold set to 33.
I don’t think you mentioned where you live. Up here in the great white north, days are cool/cold. So cold pressure right now can be 28/30. Then when it gets warmer later after driving for a few hours they’ll go up to 35/38.
Experiment a bit.

nstar8

From your original post, sounds like scrubbing the tires in may/may not help as that is a different sensation...Lowering the pressures should help on initial turn in...but the squirminess may still be there...And is most like a direct resultant of a weaker (not as strong) sidewall construction. I went through this exact same thing with the Conti's last year.
A good test is to find a nice on/off ramp (or series of twisties)...keeping an eye on the stability/traction control lights on the dash...accelerate through the corner...My guess is you won't see the lights...Next do the exact same ramp, accelerate to a fair enough speed, let off while in the apex or cornering...and check to see if the stability/traction control light comes on briefly...Mine did..usually at speeds above 60/65...which is a direct resultant of the mismatch of wheel speeds between the front and the rear, so the computer compensates immediately for that mismatch...Extremely unnerving to say the least...

I would certainly appreciate any/all feedback you can provide once you get a chance to drive the car around.

Good Luck!

Levy

i'm thinking all of the above coming into play causing the perfect storm= squirrelly

Brand new tires do seem to need a few miles to get comfy. my experience with none P cars is maybe 10 too 20 miles....30 miles max then all is good. never felt squirrelly but not very grippy out the gate

Air pressure way to high. i run my 13 C2S P zero's at 30/33 cold. took me about 3 months of ownership and this forum to help figure out the dealership set psi was insanely high (thank you RL!)

Worn tires upfront/brand new in the rear. you have a rather large differential between front/back here

good luck getting it sorted out

911dude41

Accurate.

JW911

For some reason you seem insistent on setting your pressure higher (38) than what Porsche recommends for partial load comfort settings. But I think you will find that the comfort pressures at partial load make the car handle and ride the best, unless you are exceeding 165 mph and/or have back seat passengers. I would suggest you start low and experiment upward if you don't like it. Best to maintain the front to rear difference as you adjust. For example. if the recommended pressure for your model is 31F 34R, maintain that 3 PSI difference if you experiment upward.

nstar8

UPDATE!
Just got the Nspec Michelin 4s installed. Needless to say, there is literally zero wallowing from the rear tires. And the temp here in Denver was about 38 today when I picked up the car from the tire shop.
So, for all of you out there with doubt about your tires and pressures, and etc. Just go get a set of Nspec tires and all that drama will disappear...
These Michelin tires are far superior to the Conti's and I haven't even been able to fully test them out. Absolutely amazing difference!

I'm anxiously awaiting a warmer day here so I can see what the tires can really do.

asellus

Careful driving on them when the temps are that low! Glass transition is no joke.

nstar8

Yeah for sure...drive this car all year long unless there is snow, residual snow, or extremely cold temps...Been through two winters with the Contis...now the Michelins are up...