Tire pressure
The cold (starting) inflation pressure. Lower pressures tend to give more grip and build temperature faster while adding rolling drag; higher pressures tend to feel more responsive and roll more freely at some cost in grip. The working value is the HOT pressure a stint settles into — the cold value is just the way to aim for it. The cold-to-hot rise per tire is a useful load diagnostic: a tire building noticeably more pressure than its partners is working harder.
Effect by corner phase
The pressure sets the size and stability of the contact patch under lateral load.
Symptom tendencies
These describe tendencies, not rules.
Grip and traction fade as the stint goes on
If hot pressures climb well past the intended window, lower cold pressures tend to bring the working range back.
One tire builds much more pressure than the rest
That corner is over-worked — look at balance, camber or line before masking it with pressure alone.
Verify on track before you commit to a change.