I've never had any complaints about the ride quality of my 991S. Recently, though, my daily commute to and from work felt a bit rough. The car didn't feel as composed and comfortable as it usually did. I checked the tire pressures and realized that my last dealer visit had resulted in changes to my tire pressure.

As it was, the car showed the following with cold tires: Front 37/36, Read 46/40.

The variation in the rear tire pressures was bad, but the real change came when I reduced the pressure down to our factory "comfort" setting. (You can select the "normal" or "comfort" setting through the tire pressure page menu). Comfort mode sets the tire pressure sensors to look for 31psi front / 34psi rear.

I did just that; I set the car to use "comfort" mode and a "partial load" by using the on-board measurements, and the car rides beautifully now. It made a huge difference in ride quality. Just thought I'd mention it here in case a few people are looking for a softer ride (up to 165mph only, though ).


Link to a similar experience: http://www.edmunds.com/porsche/911/2...-pressure.html

 

It's amazing how much of a difference they can make....46 rear? wow

 

Assuming it wasn't a typo, it sounds like with 46/40 imbalance in the rears the dealer did a pretty sloppy job of adjusting pressure. If that's their attention to detail I'd ask them next time to leave my damn tires alone...

 

Either that or he has a leak in one of rear tires. My experience has been that dealers usually fill tires to max vehicle load pressures for liability reasons. That probably explains the OP's tire pressures, but of course doesn't explain the 6psi difference between the two rears.

 

No leak. Been keeping on eye on it for the past few days and it hasn't dropped one bit. They just didn't do a good job on the fill.

 

Great posting. I have run the comfort settings on the street for 18K comfortable miles and am getting outstanding tire wear. I have reset it after every visit to the dealer, who insists on setting to the higher optional settings.

BTW for summer runs at the track, that is a good starting temp too.

 

+1. Not only is it comfortable but my PZeros have 22k on them with 70% tread left. Running the winter tires now.

 

Good to know. I had it set to 36/38 last time at Willow Springs, but the weather was pretty decent.

 

"Comfort" is the right setting.
"Normal" is rediculous.

It is best to ask the dealer not to touch your tire pressures, when they write up your work order.

 

thats good

 

+1

Otherwise, the damn warning comes on while you are going so fast and you are trying to keep the eyes on the road.

 

I run my summer 20" tires at 36 front 44 rear. The ride is just fine, this is my daily driver, and the car is less prone to tram lining on the wonderful New england highways.

 

What I run, works Great!

 

So the summer 20" tires at 36f/44r are fine in the winter? I'm in NJ where it's freezing right now running the summers. Do I really need winter tires or can I get by with the summer tires? I don't take the car out if it snows even a bit.

 

You need winter tires! I run Pilot Alpin, 19" in the winter. 35 PSI front, 41 PSI rear.