Tire Pressures in 355

You probably need a new shop - they sound almost dangerously high

There are several other threads here with a range of answers from 27f/31r to 36 all round with 32 to 34 all round as the most popular

 

In the Owners Manual you will find the right pressure for the 4 Tire types that Ferrari recommends!

 

I should confess that I was very much suprised with the diference on pressures for OEM tires for the 348.... from Bridgestone to Pirelli.... never would believed that would be so much diferent!!!

But the original stickers do not lie!

 

With Bridgstone S03s I run 35 PSI for the street and 32 PSI for track driving. This puts the tire at 38 PSI when warm on the street and 40 PSI when hot at the track.

With the Bridgestone RE050A PPs I am running 34 PSI front and 33 PSI rear on the street.

The ONLY real way to tell if you are running the right tire pressure is a Probe Tipped Pyrometer and measure the actual tire temperature profiles under actual drivinig conditions. Its not a <pick a number from the table> kind of game. The right tire pressures vary based on driving style, road surface and ambient temperatures.

If yo don't have a probe tip pyrometer, read your tire pressures after along run. You want them above 36 PSi and below 40 SPI. But the sweet spot is rather wide, wth softer responce characteristics on the soft end and sharper responce on the firm end.

After you find the operating pressures YOU like, put the car in the garage and come back the next day to measure the cold pressures you will want henseforth.

 

Albert- The 99 OM recommends 27 psi F and 31 psi R for Michelin Pilot SX MXX3 tires. Probably a good starting point. The PS2s did not come out until later. For the 360 with similar weight distribution and Michelin PS2s, recommended pressures are 26 psi F and 28 psi R. So 27 and 29 or 30 might be a good compromise. A little fine tunig should get you even closer.

Those PS2 pressures are consistent, by the way, even if they seem low. On my car PZeros use 32 psi all around and Michelins use 29 psi all around, and my car weighs 500 lbs or so more than yours.

Taz
Terry Phillips

 

I use around 33-35 psi in all tires when I want good mileage. I drop about 4-6 psi when I want to tear it up. I also use the same pressures all around. Never understood the reason for different ones except to induce some oversteer, which means the factory feels they built in too much understeer with their stagger.