When I originally purchased my car and took it in for an oil change they said every single tire was running 50 PSI. They checked the tires and said they dropped it down to 35 PSI last summer.

So my question is what is the correct tire pressure to run in 2001 Z06 with pilot PS2's?
I noticed that after they reduced the tire pressure last oil change the steering seems a bit off from how it reacted when I first got the vehicle. I never changed them back to 50 PSI, but I've always been curious what the right tire pressure is to run in pilot PS2's. Is 35 right or is 50 right? The car seemed to respond alot better before the tire pressure got changed.

 

You could search for a plate on the car somewhere for the pressure advices.
But I can do calculations for it if you give me the data.
What I need is from tires the sises ( 235/40R18 XL95W for instance)
And maximum load an kind of tire.
In this example W stands for speedcode up to 270km/85m?/h.
XL stands for Extraload or reinforced, and sometimes only that is written on tire, if not found its an P-tire or standard load. I need that to determine the pressure at wich the maximum load may be carried up to reference speed of 190km/??m/h for a W speedrated tire.
95 stands for the loadindex wich is 690kg maximum load.

From car I need the GVWR ( gross vehicle weight rating) , empty weight and the way you load it normally( persons and load), GAWR front and back ( Gross axle weight rating). And if mostly only rear has camber angle ( alignment tires like this on the axle /-\ instead of this|-|) also that. Also need the maximum technical speed of car, or speed you sertainly wont go over in your use.

If you give all that I will calculate a save lowest pressure , at wich no tire-damage to laws of nature will happen.
Better then the official advices because especially for low AR tires ( Aspect-ratio isthe 40 in the example) the maximum load given on sidewall is to optimistic given by the tire-makers all over the world. A thing we are not allowed to know, but now you do.

So this is the reason of my long story , so you understand why it has to be recalculated.
Could give that the 50 psi is needed to prefent tire-damage, if you have such low AR tires, but calculating makes it shure.
35 psi wich lowered to is coincidentially the referencepressure ( further Pr= pressure needed for the maximum load up to reference speed and camber angle below 2 degreees) of a normal car tire=P-tire.
Most car-dealers use as we call it in Holland, wet fingerwork to determine the pressure to fill or rules of tumb.

 

I dont know your tire or sizes or what it says on the sidewall, but I personally am running 35 in my Nitto Invos on 19 front 20 rears.

 

I would not depend on any shop, even the dealer, to get the tire pressures right.
You should not be running the tires at the max. pressure on the sidewall unless you are a max. load rating.
The original recommended tire pressure was 30 PSI, so you should be around 30 to 35 PSI, and the pressure should be checked when the tires are cold. The pressure will obviously go up as you drive the car.

Another thing to check is how was the tire wear at the higher pressure? Is the tire wear even across the face of the tire, or worn more in the center or outside?

 

I with u on that about the dealer not putting the right pressure into the tires ...I always check in all my cars specially when I get my tires changed...I keep at 30psi in my Z..and always check when the weather changes...