2013 Porsche 911: Choosing a Tire Pressure for Everyday Driving
12-28-2013, 01:00 AM
#1
Nordschleife Master
Thread Starter
2013 Porsche 911: Choosing a Tire Pressure for Everyday Driving
Here is an interesting discussion on setting correct tire pressures on a new 991.
Seems that Porsche now lists two comfort settings, one for partial load and another for full load settings.
The comfort settings in the owners manual are considerably lower than the settings listed on the door jamb.
I have to wonder if the old 36/44 tire pressures for 18" tires on the 993 were only recommended for maximum load safety (2 passengers plus luggage)?
It now seems that pressures of 34/37, front & rear may have been right all along
Seems that Porsche now lists two comfort settings, one for partial load and another for full load settings.
The comfort settings in the owners manual are considerably lower than the settings listed on the door jamb.
I have to wonder if the old 36/44 tire pressures for 18" tires on the 993 were only recommended for maximum load safety (2 passengers plus luggage)?
It now seems that pressures of 34/37, front & rear may have been right all along
2013 Porsche 911: Choosing a Tire Pressure for Everyday Driving
May 14, 2013 http://www.edmunds.com/porsche/911/2...y-driving.html
As you can see, there's not much sidewall to the tires on our Porsche 911. A set of 20-inch wheels doesn't leave much room for such extravagances. The result is a slightly jarring ride depending on what you consider jarring. Personally, I think our 911 rides exceptionally well given its combination of paper thin sidewall and firm suspension. It's an easy everyday driver, even on the beat-up, concrete highways here in Southern California.
Of course, not everybody agrees and Porsche knows that. There's apparently enough disagreement that the company even provides two sets of tire pressures. There are the standard settings on the door jamb and the "comfort" settings in the owner's manual. And even with those, there are "part load" and "full load" settings.
Needless to say, Porsche's engineers have gone to great lengths to dial in the correct pressures for the various situations you might encounter in the 911. It's as much art as it is science, requiring thousands of hours of testing and research. With that in mind, the next time you see a new Porsche 911 with aftermarket tires and wheels, don't listen to the owner if he or she says it rides like a truck.
May 14, 2013 http://www.edmunds.com/porsche/911/2...y-driving.html
As you can see, there's not much sidewall to the tires on our Porsche 911. A set of 20-inch wheels doesn't leave much room for such extravagances. The result is a slightly jarring ride depending on what you consider jarring. Personally, I think our 911 rides exceptionally well given its combination of paper thin sidewall and firm suspension. It's an easy everyday driver, even on the beat-up, concrete highways here in Southern California.
Of course, not everybody agrees and Porsche knows that. There's apparently enough disagreement that the company even provides two sets of tire pressures. There are the standard settings on the door jamb and the "comfort" settings in the owner's manual. And even with those, there are "part load" and "full load" settings.
Needless to say, Porsche's engineers have gone to great lengths to dial in the correct pressures for the various situations you might encounter in the 911. It's as much art as it is science, requiring thousands of hours of testing and research. With that in mind, the next time you see a new Porsche 911 with aftermarket tires and wheels, don't listen to the owner if he or she says it rides like a truck.
12-28-2013, 01:13 AM
#2
Rennlist Member
I'm running 225/40/18 and 265/35/18 at 34 psi and 39psi cold and worried about going lower. In defense, those pressures gave me very even wear with my, perhaps, lower than ROW ride on PSS10s
12-28-2013, 01:28 AM
#3
Nordschleife Master
Thread Starter
I run the same tire sizes at 34/37 psi front and rear and have excellent tire wear. (RS ride height with Hankook EVO V12 tires)
12-28-2013, 03:06 AM
#4
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Before we start discussing a few PSI here and there, I wondered what the accuracy is of the average tire gauge, and do we need to establish a baseline gauge to compare between cars and owners? I looked around a bit, and found this video - of the ones tested, most of the cheaper ones seemed to read a bit low - some out a few pounds or more...
Cheers,
Mike
Cheers,
Mike
12-28-2013, 11:43 AM
#7
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Before we start discussing a few PSI here and there, I wondered what the accuracy is of the average tire gauge, and do we need to establish a baseline gauge to compare between cars and owners? I looked around a bit, and found this video - of the ones tested, most of the cheaper ones seemed to read a bit low - some out a few pounds or more...
http://www.youtube.com/watch?v=8OPljSXxGfs
Cheers,
Mike
http://www.youtube.com/watch?v=8OPljSXxGfs
Cheers,
Mike
On the track, it is not so much where you start (cold) but where you end up (hot) and tire temps across the tread width. And on the track, 2 lbs change at a time seem to be the unit of change measure.
Roadway driving, tire ware, comfort, nosie, and handling/saftey are all factors is setting a tire temp. YMWV.
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12-28-2013, 09:20 PM
#8
Nordschleife Master
Thread Starter
Before we start discussing a few PSI here and there, I wondered what the accuracy is of the average tire gauge, and do we need to establish a baseline gauge to compare between cars and owners? I looked around a bit, and found this video - of the ones tested, most of the cheaper ones seemed to read a bit low - some out a few pounds or more...
Cheers,
Mike
Cheers,
Mike
12-29-2013, 09:29 PM
#9
I use a tire pressure gauge from Intercomp that I bought when I got serious about vintage racing. I use it to get to "general" settings. For racing or DE's, I do a series of laps, on the street a good 5 - 10 mile run and then use a pyrometer to measure the tire temps at 3 points across the face of each tire. The goal is to have as close to equal or a smooth transition of temps across the faces of all 4 tires.
This has worked well as evidenced by tire wear or by lap times.
This has worked well as evidenced by tire wear or by lap times.
12-30-2013, 12:12 AM
#11
Rennlist Member
Before we start discussing a few PSI here and there, I wondered what the accuracy is of the average tire gauge, and do we need to establish a baseline gauge to compare between cars and owners? I looked around a bit, and found this video - of the ones tested, most of the cheaper ones seemed to read a bit low - some out a few pounds or more...
Cheers,
Mike
Cheers,
Mike
You pay for quality.
