Tyre Pressures in winter

[Toddie]

Also worth noting that the tyre fill details can be viewed in the Car Connect app after you've been for a suitable drive.

Screenshot_20201124-224435.jpg

Ah the Porsche Connect App, another Black hole to fall into! Is this the free one? or do you need the Connect subscription to get this to work?

Never got my head round this.

[pmg]

Also worth noting that the tyre fill details can be viewed in the Car Connect app after you've been for a suitable drive.

Screenshot_20201124-224435.jpg

Ah the Porsche Connect App, another Black hole to fall into! Is this the free one? or do you need the Connect subscription to get this to work?

Never got my head round this.

It's a separate subscription with Vodafone rather than Porsche

[Tracky]

Interestingly I probably take out about 10-12 psi during the course of the day when in my track car on a warm summer day.

Me too. But your putting a lot more temperature into the tyre on track. Never seen melted rubber on my road car.

IMHO you are not going to notice +/- 2or 3psi on the road under normal driving conditions.

You aren’t trying hard enough on both counts !!

[Nuclear Nick]

From the Good to Know app:

Screenshot_20201124-184057_Porsche Good to know.jpg
Screenshot_20201124-184214_Porsche Good to know.jpg

Thank you very much for finding that, it answers all my questions. Somehow I never think to look @ that app.

This just highlights how useful this forum is. Thanks again.

Also interesting is how many times the same questions get answered!

And hopefully to clarify, as there were varied replies, the TPMS DOES compensate for tyre and ambient temperature, so you can use the add or subtract figure in the MFD/tyre fill info screen to adjust your pressures, once the TPMS has registered after the car has moved a short distance. The tyres do not need to be warmed up.

[111rdw]

Interestingly I probably take out about 10-12 psi during the course of the day when in my track car on a warm summer day.

Me too. But your putting a lot more temperature into the tyre on track. Never seen melted rubber on my road car.

IMHO you are not going to notice +/- 2or 3psi on the road under normal driving conditions.

You aren’t trying hard enough on both counts !!

[Tracky]

Well that’s all of my normal cars thrown puncture warnings now in as many weeks due to drop in pressure with the temperature!

[RGS]

Trouble with checking tyre pressures when you're on the move is that individual tyres will begin to show different pressures depending on the driving conditions even though each tyre was identical to the other on the same axle before you started so you will never get an accurate reading.
I was always told check tyre pressures when they are cold and adjust as necessary which I do weekly summer and winter and maintain them at the correct pressure regardless of the ambient temperature. I would never drive on under inflated tyres, better to be slightly over than under.

[Tracky]

Agreed. Should be done cold

You don’t need to drive far to get some pressure in them

[Neil1911]

Toddie, I'm with you in this one. I've combed the internet and read lots that took me back 40 odd years to physics lessons and some more about purported benefits of tyres filled with nitrogen but am no nearer an answer to the question: if a tyre should be inflated to 33psi at 20C, what pressure should it get at 3.5C? Sadly, I don't feel as though this thread has answered it ........... yet!

[111rdw]

One assumes the car manufacturers have done all the work and the car is safe irrespective of the temperature the tyre is at when you inflate them. Clearly inflating a tyre to 2 bar cold in February is different to 2bar in July. And the manufacturers do not give summer and winter pressures. If it was a safety issue they would, imagine the court cases. And it changes anyway when you drive but not massively. My wife's BMW has a tyre temp read out and it only moves 3-4 deg in normal driving. As previously mention by a couple of us you have to bleed loads out on track after the first session or 2. That’s because round a track at speed they get hot. How many roads do you know where you can drive 80+ mph around 15 bends every 3 miles for 20minutes. That puts loads of energy and temperature into the tyres. However you will never get your tyres that hot on the road. And if you do you shouldn’t be on the road. Or not anywhere near me. And IMHO most of us cannot really tell a few psi change in tyre pressure driving at normal road speeds. For what it’s worth blow them up to the correct pressure, check occasionally and enjoy the drive. Waits to be