The best way to set pressure is to check tire temps across the face and adjust accordingly. While ideally you would have someone do this in the hot pits during a session, you can do this immediately after a session and get a decent feeling for where your temps are at. Will also help you with setting camber, toe etc.
I run much lower temps than most - I run at 26 front and 28 rear hot - but i'm also running 245/40/18 and 275/40/18 f and r respectively. I've based this on the log book of the previous owner as well as tire temps across the face.
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