Wayne Smith

Good to hear. I ran some fairly spirited miles today and the tires handled well although I didn't trust them and selected lines that have leeway. Tomorrow I'm back on the freeway and will see what happens.

Wayne Smith

For what it's worth the tires stopped pulling (or pushing) the car back and forth after about 1300 miles and the rumbling noise ended at 1500 miles. The last 400 miles have been normal. The sidewalls seem softer on this set than on the last set. This makes setting up for long sweepers less comfortable. But it's only been a few days with these new tires on the car. Time will tell.

pro1200

The verdict is in from my dealer-PS4S tires are not good for track duty. I will be replacing them with Michelin PS2 with a Porsche N specification.

GTSpure

I drive with PS4S tires and they are amazing.
My air pressure is 2.3bar front (cold) and 2.5bar rear (cold) and it is perfect for Track / Mountain driving

texass4

That’s a big statement from a dealer. If you had newer good tires in good condition, I would not rip them off in favor of another Michelin (or any other comparable) tire just because of an ad how recommendation from a dealer. There are a ton of questions and assumptions in that statement that I would want to verify first. Besides, wouldn’t a PS2 to PS4S change be little more than an academic exercise? I can’t imagine there’s THAT much difference in the two.

I’m following this thread with curiosity, as the PS4S seems to be universally as one of the very best tires in the segment for a great balance between grip, wear and noise. Strange to hear all of this negative chatter.

GTSpure

I agree and join Mr. texass4.
PS4S is an excellent summer tire for DD and track.

Enough to see the cars with this tire and who is driving this tire: Chris Harris GT3 .. Ferrari TDF ..

Move to 15:47

Move to 02:09

and the list is long ..
They need to be heated and they are perfect. It is important to work with the right air pressures.

pro1200

I agree 100% with your assessment-the PS4S came highly recommended from club members and the installer and I have them installed on my Audi so I didn't think there would be any issues. What's weird is that I didn't realize the tires ruined the handling at the track until about a week after the event. At the time I thought it was odd that the car was hard to get through the turns and wandered at high speeds but I shrugged it off to the high winds that day.

So, here's a theory-in light of the problems that others have posted, maybe there is a defective batch of PS4S tires in circulation.

ADias

Sure is a big statement... PS4S is a great tire. If not PS4S then Sport Cup 2 (if you do not drive in the rain or only in light rain) and never the very old PS2. I had PS2 20 years ago...

ADias

That can happen an Michelin will exchange them... Also... always change tires as sets of 4 to obtain best performance.

Deven

Thanks, I am down to 31/37 (the problem with 29/33 is that the TPMS low pressure warning comes on). The car drives significantly better and significantly quieter. I might end up at 33/37 (which is where I have always been since 2006).

Kineticdg

My 997.2 C2S SPASM / spacers (otherwise stock) with PS4S tires has lightning-fast turn-in and very stiff feeling sidewalls. I drove it back to back with a 2008 C4S with Michelin tires this week (forgot to check if they are PS4S or PS2S), my car was much faster reacting (and less comfortable, but I assume that’s the SPASM). If it’s “soap” then it’s soap used by a Le Mans LMP1 team. I don’t have documents on the age of the tires, but they were likely purchased in 2019 and have maybe ~5-10k miles on them. I wonder if there was a change to the construction or compound since then?

jtsmith18

PS4S’s installed on a 2011 C2S in Feb. 2020 in Palm Desert CA. Tried 3 times to balance them at different places but would not run smooth. Tirerack replaced 1 front and 1 rear, although somewhat improved it still had vibrations after 2 more balances. The suspension was suggested to be the problem. Shipped the car back to Canada and tried one more time to balance…no go. I was about to sell the car but decided to invest in 4 new Pirelli PZeros. Smooth as glass. Although they are all made in the US, Michelin will not honor any warranty in Canada on US purchased tires. All 4 PS4S in the dumpster with less than 1500 miles on them! The suspension was never at fault. I have been a Michelin fan for 50 years but no longer. There are other great tire brands.

Wayne Smith

I haven't had a chance to test mine after the initial problems. They seemed to get better at around 1400 miles but then the handling was still terrible (scary) on the subsequent group drive through the Trinity Alps. I found myself pushing to 80% and more to keep up whereas I prefer to stay below 75% on the road. I blamed the suspension as well, but am hesitant to make changes. I've got another spirited drive coming up in ten days. I'll know more after that.

I've trusted Michelin for many years. I'm still (trying to be) hopeful.

ilovemaui

Interesting thread. I have two sets if rims, one set has PS2’s 18” and the other has PS4S’s 19”. The main differences are that odometer is reading 2 mph slow with the 19’s and the 18” PS2’s are considerably noisier. Handling might be a slight bit better with the PS2’s. I don’t track so my experience is manly highway driving.

jtsmith18

Wayne, I tried everything including an alignment. I wasn’t about to start trying to diagnose/repair a suspension/PASM issue, that’s a black hole. The last ditch effort was a high end tire and wheel specialist. They said the tires were at fault. I decided to spend the money on a new set as a last ditch effort before selling my car. Bingo….problem solved and am I one happy guy. Have a replacement DSC controller coming this week (original was faulty and I hoped it would solve the suggested suspension Issue). I’m in love with the car all over again as I endured Bridgestones before the PS4S’s.