As I recall with 175/80/14 Uniroyal RainExpert's fitted all round I went with 30psi front, 28psi rear.
With 175/70/14 Kumho mud & snow tyres fitted the pressures had to be much lower - 24psi front and 22psi rear or the car felt uncontrollable.
Without a manufacturer's handbook, trial and error is the way forward and/or sideways...
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