Tyre Pressures in winter

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Toddie
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Post by Toddie »

First car i have ever had with TPMS, so please bear with me , in August i set the tyre pressures as recommended in an ambient temp of 20C. to 33psi front & 36psi rear.

So in these winter temperatures of 8C or so what do you do?

Do you adjust your tyre pressures to the cold weather? what do people do on here?
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SAC1
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Post by SAC1 »

No need to adjust for winter.
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Post by Tracky »

They will have probably dropped so just adjust back to recommended number
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111rdw
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Post by 111rdw »

It will tell you under fill info.
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Post by Madelvic »

Pressures are correct 33/36. No need to change for winter. You might notice the TPMS display shows pressure increasing as tyres get hotter; think the fill pressure is supposed to be at 20degrees C
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Paul
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Post by Paul »

111rdw wrote: Tue Nov 24, 2020 12:04 pm It will tell you under fill info.
^^
..which does adjust for temps...
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Post by AllanG »

I just check my tyre pressures regularly, and inflate as necessary.
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jaffacake
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Post by jaffacake »

A change in ambient temp doesn't make a massive difference to pressures. Even a shift of 30 degrees C is only going to cause a pressure change of less than 10%
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Paul
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Post by Paul »

jaffacake wrote: Tue Nov 24, 2020 3:05 pm A change in ambient temp doesn't make a massive difference to pressures. Even a shift of 30 degrees C is only going to cause a pressure change of less than 10%
🤔
Certainly enough to change the instant TPM reading upwards by 0.2 or even 0.3 bar from rest to working temp in the summer (and “loosing” 0.2 bar from rest in the winter, which I guess was the OP query)
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Toddie
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Post by Toddie »

Paul wrote: Tue Nov 24, 2020 4:08 pm
jaffacake wrote: Tue Nov 24, 2020 3:05 pm A change in ambient temp doesn't make a massive difference to pressures. Even a shift of 30 degrees C is only going to cause a pressure change of less than 10%
🤔
Certainly enough to change the instant TPM reading upwards by 0.2 or even 0.3 bar from rest to working temp in the summer (and “loosing” 0.2 bar from rest in the winter, which I guess was the OP query)

Thanks for your answers, i am aware of a drop in Tyre pressures as shown up in the TPMS reading, what i am trying to asseratian is how people on here deal with it. If you re inflate it is not @ 20C so therefore not as Porsche advise. Once you start driving the car the presures increase as the tyres warm up, so just trying to get my head round it. The drop in TP that i am showing is about 3 PSI per wheel cold.
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