Tyre Pressures in winter
According to the manual the tpm takes temperature into account. So it was my understanding that the fill info will be temperature independent. I think it’s significant it doesn’t tell you what pressure to inflate to but the pressure difference to add or remove.
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.
2017 Macan S, Carrara White Metallic, Agate Grey Leather, 21” 911 Turbo Design wheels.
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.
On order
GT4 RS
Current
992 S
Macan.2 S
928S4
Modified Lotus Exige V6
Seat Ibiza 1.0 (115ps) DSG Excellence Lux(dog’s!)
Jag Mk2 3.4
Ex
981 Boxster S
GT4 RS
Current
992 S
Macan.2 S
928S4
Modified Lotus Exige V6
Seat Ibiza 1.0 (115ps) DSG Excellence Lux(dog’s!)
Jag Mk2 3.4
Ex
981 Boxster S
So a drop of 2-3 psi isn’t to be ignored and for some people could be noticeable too
On order
GT4 RS
Current
992 S
Macan.2 S
928S4
Modified Lotus Exige V6
Seat Ibiza 1.0 (115ps) DSG Excellence Lux(dog’s!)
Jag Mk2 3.4
Ex
981 Boxster S
GT4 RS
Current
992 S
Macan.2 S
928S4
Modified Lotus Exige V6
Seat Ibiza 1.0 (115ps) DSG Excellence Lux(dog’s!)
Jag Mk2 3.4
Ex
981 Boxster S
As stated above the Fill Info screen gives you what is required as that takes the temp at the time of reading into account. If the pressure at 20 degrees one day is correct when the ambient is plus 15 it will also be correct the next day of there is a cold snap.
Macan SD Vocano Grey. LEDs, Pano Roof, PSE, Sports Chrono, PASM, Sports Design Mirrors, 21" Sports Classics in Black, lots of other extras.
http://www.porsche-code.com/PJ2XHAR5 for the day that this works again.
987 Boxster 2.7 (2006)
http://www.porsche-code.com/PJ2XHAR5 for the day that this works again.
987 Boxster 2.7 (2006)
Also worth noting that the tyre fill details can be viewed in the Car Connect app after you've been for a suitable drive.
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2018 Macan Turbo Exclusive Performance Edition with all the trimmings
viewtopic.php?f=23&t=10070
2018 Macan Turbo Exclusive Performance Edition with all the trimmings
viewtopic.php?f=23&t=10070
I agree that 3 PSI isn't to be ignored, but you aren't likely to see that kind of change in a warm tyre. TPMS only works after the car has been driven for a while and the tyres are warmer.
You simply aren't going to see a 30C variation in the internal air temperature of a warm tyre. Sure the ambient temp may move from +20C to -10C between summer and winter, but you're never going to see this kind of variation in the warm tyre.
Also worth noting that the "tyre pressure" is actually only a measure of the difference between the pressure inside the tyre to the pressure outside the tyre. The outside pressure varies too. Usually when the weather turns colder, the barometer falls as atmospheric pressure drops significantly. This means the TPMS would read a higher pressure, but the content of the tyre never changed at all. But then the colder temperature helps cancel that change out.
No doubt that a cold tyre sat outside overnight in the winter will read lower pressure than it did on a warm summers day, which is why getting them up to a reasonable operating temperature is sensible before reading any pressures - which is what TPMS does.
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2018 Macan Turbo Exclusive Performance Edition with all the trimmings
viewtopic.php?f=23&t=10070
2018 Macan Turbo Exclusive Performance Edition with all the trimmings
viewtopic.php?f=23&t=10070
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.
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