ajeffrey10

Dewinator

erko1905

I run 30/33 cold; the "comfort" pressure for 4S. Heats up to about 33/36 usually w street driving, which rides and handles fine.

I think 44 cold is way too high. If you put some heat into those rears you'll approach the high 40s, and w these tires max psi it can safely hold is probably in the low 50s.

subwoofer

chuck911

36/44 cold is high. Everyone seems to think this is car specific but its not. Any Porsche ever made, 911 or otherwise, heck practically any car ever made, that is just plain high. At 44 you are already at the point where traction is being lost compared to lower pressures. Plus its a cold pressure, which is even worse, because the minute you start driving the tires warm up pressure increases and then you're definitely sacrificing grip. Anything 45 or more you should really notice the tires starting to lose grip and skate around. Also do this long enough and almost certainly there will be uneven wear with greater wear down the middle. The only "advantage" running this high is you will notice the car response is razor sharp. This is because the tires are so hard with that much pressure the sidewalls hardly flex at all. But you pay the price in ultimate traction and ride smoothness.

The best overall performance is closer to the so-called "comfort" range of something like 30/35, 33/38, something like that, HOT. Cold does not matter. Whatever it is cold that results in that when hot, when you are driving, that is what matters. Also whatever 911 it is does not matter. Tires, that DOES matter. Some tires work better a few psi higher or lower than other tires. No street tires I'm aware of work better at 45. That is just out there.

Porsche has always specified a pretty big f/r bias of 5 psi or more. Some of this is necessary because of the 911 rear weight bias. But then they add in even more to bias towards understeer, because they know their customers don't know how to drive. Understeer is always deemed safer for unskilled drivers. That is why you will see the more experienced drivers recommend pressures with a smaller f/r bias, often as little as 3 psi. But really, anything around these numbers is well within your personal preference.

worf928

Here - https://rennlist.com/forums/991/1057...-purposes.html - we beat the crap out of the tire pressure topic a couple of days ago.

drcollie

There is only ONE correct tire pressure to use on the street - that's the one that gives you even tire wear.

chuck911

Good one. But just for the record, April Fools Day is tomorrow.

okbarnett

try 36 cold all around

Mr. Big

I'm using the recommended 35 psi front and 45 psi rear. Is it best not to do so?

Al.Fresco

https://www.edmunds.com/porsche/911/...-pressure.html

Mr. Big

^^^ Great info, thanks! Owner's manual says 31/37.

worf928

Part-load Comfort Pressure is the 'go-to' pressure. See above linked thread for dead horse beating.

Stevelev

Penn4S

I have a widebody car with 245 f and 305 r. I run 31 f and 35 r. Car rides extremely well, handles perfectly and I always watch and get even tire wear. No need for daily driving to run high pressures like 36f and 46r unless you have 4 meaty passengers and their luggage.