I have some Bridgestone Turanza Serenity 255/40r19 tires on my XJR and i dont know the proper psi they should have can anyone help me out?

 

The Jaguar recommended pressures are located inside the gas door. I don't know if that is what you are looking for or pressures specific to the tires you put on?

 

Front 32Psi rear 34 Psi.

 

I exceed the Jaguar recommended tire pressure by 30% as I found that at this pressure both my tires and rims do not easily get damaged by potholes or any severe bumps on the road. The ride at this pressure is a little rough but worth the savings on repair bills.

 

That means you are running 42-44psi cold which is a bit hard core.

A few extra psi can be justified for the reasons you supply but there can be side effects too such as wear on various components (bushings etc), poorer traction (esp wet), and remember that actual running pressure is increased even further with speed and heat.

 

I over inflated mine too depending on weather.

Colder days F35/36 R37/38
Warmer day F34/35 R36/37

 

Thanks for the advice. I maintain a pressure of about 36psi on all 4 tires. Will I experience the problems you suggested if I maintain this pressure, and do you think keeping both the front and back at 36psi will also be problematic?

I will try to reduce the pressure down to 34psi.

 

IMO 34 is smarter and safer than 36, for reasons supplied above.

However my personal practice is to stay within 2psi of mfr recommendations.