I had this issue when I first got my car ten years ago. It had a bad rear wheel bearing. The bearing was bad long enough that it also ruined the tire. New bearing and tires and the car felt great. The car is also very sensitive to air pressure in tires so make sure that is correct and even.

Years later I again started experiencing unnerving handling particularly on wet roads. The rear tires were worn but not totally shot. They were pretty old at this point but still had some tread. New tires and the car once again feels great. I did have an alignment done when I got the new tires last year but the alignment was pretty good before they dialed it in. In summary, this car is super sensitive to tires/suspension/alignment/tire pressure more so than most cars.

 

Had the same issue when I picked up my car last fall.

Did a fly and drive to NJ from MI. When I inspected the car, noticed the rear tires were about done. Rained the whole way home, a lot of rain. Hitting any new asphalt sections on the interstate >40 mph would result in the equivalent of a tank slapper. Only way to avoid it completely was to put the clutch in and ride it out. If I just lifted, it would start to rotate, if I added any throttle, it would start to rotate.

Stopped several times to try and find a tire store, but I was in the middle of PA and it was Sunday afternoon.

Longest drive of my life, car tried to kill me several times but we worked thru it and I feel we really understand each other now...

Good tires and an alignment are key.

 

I have to say I have not noticed any of this. Stock or modified. I typically keep pretty good tires on it, but do run them to the wear bars (RE-71Rs) and even a bit below sometimes when trying to stretch a set of autox tires life out. I have driven in rain after an autox event where I had 27psi in them or normally with 30psi in them. I am going to have to say alignment is likely the biggest point. But yes, if it is acting like it is hydroplaning then tires need to be addressed. My S2k does hydroplane worse than my other cars, but the wide extreme performance summer tires not known for their rain ability is the culprit there. But even with that in mind it is nothing like some of you are describing.

 

Me neither. My guess is its not just worn tires, but old worn tires. Combine that with alignment out of whack, and the issues make more sense.