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I like 36/40 in the cooler spring (March and April) and fall (October) months and 35/38 in the summer (May-September) months. That was on my PZeros for 37,000 miles (2 sets of rears, one set of fronts). I haven't dialed in the new Michelin PSS yet. I will next driving season.
I find 32F-35R perfect for MPSS in the summer. They go up a couple of pounds on the highway when hot.
In the winter, on the suggestion of a friend who repairs wheels I run a few pounds more to try to avoid potential bad results from potholes. They needed filling when the temp dropped.
I don't generally run on them when its much below 40 F, and never when its cold and wet- I can control cornering speeds but stopping fast gets hairy fast.
(This is a .1S so it may not pertain to the larger tires on the .2).
I wish I had seem this in 2012 when I got my first 911. I spent 2 years in misery until I figured out the proper pressure settings myself and ran lower pressures. Seems dumb now, but I was just following the door jam...
I think the dealer should make sure the customer knows about this. Maybe some legal issue is the reason they don't mention it? Took me a couple of weeks. I was out driving and was scrolling through the information and came across the tire pressures. Couldn't believe what I was seeing. Pretty surreal! So I did the same thing-got on this forum and found out what was going on. Now run the comfort pressures and much much better.
To be honest, with the excellent performance of the "Fill Info" readout in the Tire Pressure Menu, I don't even consider directly setting the air pressure to an absolute value anymore without checking the recommended delta for my current comfort/load setting (see image from manual). Since this system takes into account the temperature AND the pressure of the air in the tire, it is pretty foolproof to get the right pressure this way regardless of tire and/or outdoor temperature. Once I have the +/- delta to use, I'll adjust the tire pressure by that much using my gauge and compressor if an adjustment is required and recheck the deltas (the readings update reasonably quickly).
Sometimes I'll still check the absolute value out of curiosity. This morning it was around 45 degrees here in Central Texas. The cold tire pressures reported a zero recommended change. Out of curiosity, I checked the absolute pressure and was surprised the fronts were only 29 psi (comfort/partial setting)! After driving out to the PCA group drive this morning they were up to 34.
The bottom line is: I'd just recommend using the Fill Info settings for Partial Load, Comfort or not as is your preference. Its use of temperature and pressure together likely gives a result more appropriate that 99% of us could figure out alone.
To be honest, with the excellent performance of the "Fill Info" readout in the Tire Pressure Menu, I don't even consider directly setting the air pressure to an absolute value anymore without checking the recommended delta for my current comfort/load setting (see image from manual). Since this system takes into account the temperature AND the pressure of the air in the tire, it is pretty foolproof to get the right pressure this way regardless of tire and/or outdoor temperature. Once I have the +/- delta to use, I'll adjust the tire pressure by that much using my gauge and compressor if an adjustment is required and recheck the deltas (the readings update reasonably quickly).
Sometimes I'll still check the absolute value out of curiosity. This morning it was around 45 degrees here in Central Texas. The cold tire pressures reported a zero recommended change. Out of curiosity, I checked the absolute pressure and was surprised the fronts were only 29 psi (comfort/partial setting)! After driving out to the PCA group drive this morning they were up to 34.
The bottom line is: I'd just recommend using the Fill Info settings for Partial Load, Comfort or not as is your preference. Its use of temperature and pressure together likely gives a result more appropriate that 99% of us could figure out alone.
I think the dealer should make sure the customer knows about this. Maybe some legal issue is the reason they don't mention it? Took me a couple of weeks. I was out driving and was scrolling through the information and came across the tire pressures. Couldn't believe what I was seeing. Pretty surreal! So I did the same thing-got on this forum and found out what was going on. Now run the comfort pressures and much much better.
Every time my car is serviced, they reset my pressures to the max full load pressures of 36/42, even when I tell them not to do so. And my service receipt states something on it to the effect "Per California law, tire pressures adjusted to manufacturer levels...' I think others do it for liability reasons. I now bring my pressure gauge with me and lower them before I leave.
Ran my first set of PZeros to 15,000 miles. The second set I ran to 21,000 miles. I expect the same from the MPSS.
LexVan,
What made the second set of rears last longer? I am changing out my OE rears at 16.5k because they are right at the wear bars now. I would love to get over 20K our of the replacement PZero (N1).
12-10-2016, 12:50 PM
