Reference Tire Pressure Settings

[USMA81]

Shown below is my tire pressure data on a recent trip. When one adds or subtracts the current pressure and the difference from the target/reference, the resulting reference pressure for each wheel is different. So for the left front 39 + 3 = 42 target or reference. It’s different for each tire: front 42 and 44, rear 42 and 44, left/right respectively.

Going under: Settings, Vehicle Settings, Tire Pressure Monitoring one can select the tire size, type and vehicle load. It then shows the reference pressure (no way to adjust this manually). For my vehicle tires and a partial load, the reference is 40 psi for all tires, not 42 or 44.

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[jadatis]

I dont know wich brand Macan is , but Porche and BMW calculate recomended pressure for the setting, from 20 degrC/ 68 degrF to the temperature in tire, also sended by the tpms sensors.

Then your right side was in the sun when you took the picture. And I think not driven yet.

Idea behind it, is that at higher temperature a higher cold ( and so warm ) pressure is needed, to give lesser deflection so heatproduction, because cooling down of tire-material is also lesser at higher ambiënt temperature.

They do this to give lesser confusion for the user, so you wont go lowering a warm pressure, wich you never must do.

But nice attempt, but also gives confusion for the more educated user.

Mayby my explanation comforts your mind.

Another thing, mayby a lower pressure is completely save for your driving situation ( load and speed) . This " pigheaded Dutch selfdeclared tirepressure specialist " can help you determining that.
Mayby you can then give in system another setting , like comfort instead of sports, so lower recomended pressure is used for that.

I am no professional, yust a hobyist with a rubber ducky.

 

[ColdCase]

Interesting, always wondered about that variation.

I've started monitoring pressure more regularly awhile ago as it seems all my tires loose a PSI about every 200-300 miles. 55+ years of spirited driving and thats new to me. I've seen one tire lose a bit of air on sharp turns.

Perhaps a batch of porous wheels, but you would thing the sealer would block that.

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