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I should have added that this question relates to a 911 Targa 4S. There is clearly extra weight involved with the Targa. By the way, does anyone have information on how the Targa changes (or doesn't) the front/rear weight balance of the 911?
I should have added that this question relates to a 911 Targa 4S. There is clearly extra weight involved with the Targa. By the way, does anyone have information on how the Targa changes (or doesn't) the front/rear weight balance of the 911?
+150lbs if I remember correctly. Still going Comfort 30/32
From the Porsche Manual, here are the tire pressures for regular and comfort. I’m set at TPMS Comfort and 30/32 and the ride comfort is significantly better than the higher settings. We do have PASM Sport on our cars.
Why only comfort? The question was about a balance between comfort and performance.
I’m getting old. 😂
Truthfully, plenty of performance with PASM Sport and these tires pressures. Click of the button and I’m in a firmer setting. Very please with the choices. Even sold off my TechArt HAS kit because it’s just right.
When I picked up the 911 at higher tire pressures, I could feel every pebble. Immediately thought I chose the wrong suspension. After switch to TPMS comfort I’m back in my happy place. I also have Sport PASM, RAL, FAL, and PDCC and couldn’t be happier.
You could set your own standards for comfort and performance.
Tirepressure is to give the tire a deflection, that wont overheat any part of tire-material when driving constant the speed for wich its determined.
For that you need to determine next as acurate as possible.
1. Max speed you wont go over for even a minute in your use.
2. Weights on seperate wheels, per axle will do.
For that best is weighing in loading you use with also persons in it. You can stan in row behind RV, for wich weighing is standard procedure.
That 2. Is the most tricky part, and your responcibility. Estimating is dangerous.
Once you have that, I can make a pressure/axleloadcaacity list for your tire and max speed, in wich you look back the axleloads for needed pressure.
Standard I make these lists for max 160kmph/99mph, and give 90% of calculated loadcapacity.
Determined this to give maximum reserve, with still acceotable comfort and gripp.
I think, even a Porchedriver can control him/her-selfe to not go over 99mph.
From tires I need next, read from sidewall.
1 maxload or loadindex
2.kind of tire to determine referencepressure, shal be XL/reinforced /extraload ( AT 42 psi, 2.9 bar)
3. Speedcode, less important.
Then in the end you look wich setting suets best the pressures you determined.
But this way you have a personal customised setting, in line with laws of nature, wich always rule above other.
On my Targa I usually go ~32-33 front ~34-36 rear.
But it really depends on a few things to consider: load as mention, speed and even road conditions. Bad roads I would go a little higher to give you a little more air for the bad roads.
Seems like most are running at (or near) 'comfort' pressures. The manual states that "Comfort tire pressure for summer tires up to 165mph" which begs the question "why run anything else?" Is there any real or perceived advantage of going with full or partial load pressures assuming a the only 'load' consists of driver and (potentially) a passenger?
Seems like most are running at (or near) 'comfort' pressures. The manual states that "Comfort tire pressure for summer tires up to 165mph" which begs the question "why run anything else?" Is there any real or perceived advantage of going with full or partial load pressures assuming a the only 'load' consists of driver and (potentially) a passenger?
A great question. I would love to hear opinions on this.
On my Targa I usually go ~32-33 front ~34-36 rear.
But it really depends on a few things to consider: load as mention, speed and even road conditions. Bad roads I would go a little higher to give you a little more air for the bad roads.
Thanks for this. I moved to the Partial Load settings (33 front, 39 rear) from the Full Load settings, and will see how that changes the road feel.
02-25-2024, 10:20 PM
