Can the forum advise what the best tyre pressures are for a 355 running OEM wheels with standard sized tyres 225/265 .....street use only I have Michelin Pilot super sports on the car
If you want to know what is on the door placard:: then look If you want to know what is best, buy a probe-tipped pyrometer and learn to take tire temperatures and then how to read them. Tire temperatures will tell you if a) pressure is correct, b) camber is correct, c) toe is correct, For the way you are driving the car at the moment. I use 35F/35R on the street and 32F/32R on the track.
I am sure your already know but those tyres are a pure joy. Tyre dog sells a tpms for about 150 bucks gives temp and pressure. I started playing with it and what is weird is the ps rear is allways th highest pres and temp. Kinda neat o monitor them as your driving.
The manual says 27 front 31 rear for Michelin pilot ss We have them on our cars at those pressures. Robb
Interesting Did not know the manual catalogued the Michelin PSS tyre Will take a look....maybe the 1995 car manual does not have this... Anyways thanks Robb...am gonna change to 27 and 31.... Strange though how for these tyres there is more pressure in the rears...all other tyres state greater pressure in the fronts🤔
Mitch's answer is best for today's tire compounds. The placard and manual are outdated. For my rain tires on the track, it's 32F/32R. For slicks it's 30F/30R. For tracks with significant banking, I keep the tire pressure at 32 for the right rear. This table is a good reference for various components' effect on handling including tire pressures... .
Pilot super sports weren't available when the 355 was made, it gives specs for the Michelin pilot sport (or maybe ps2,but definitely not the super sport). I just started with 35psi f/r and tuned from there at autox. I ended up with 37f,34r for best grip and balance - both Dunlop direzza star specs and conti extreme dw liked those pressures. The rear seemed more sensitive to small adjustments. Slicks are 2psi less for best grip and balance. Guidance from Hoosier was minimum 10psi per 1000lbs, so 32psi rear is right at the minimum for a street car, and slicks generally like a little less pressure than street tires. Those are hot psi immediately after a run, so cold static pressure will be lower. I used the same at the track and balance was spot on. Ymmv, and I'd expect different tire brands to behave differently. Maybe add 1psi for gts and 2psi for spider.
The manual for my 95 gives pressures for Bridgestones and Pirellis. No mention of any Michelins at all.
When I shod mine with Michelin Pilot Super Sports I initially used the pressures in the handbook for the (very) old Michelin Pilots. I then became afraid that I had made a seriously expensive mistake as the handling/grip was all over the place. A lot of trial and error later I settled on 34psi front and 36psi rear. Handling/grip now superb and much better than the original Pirelli boots.
