MarkG123

Just purchased a lightly used 911 991 GTS (1900 miles). Drove the car home 620 miles from the dealer. A few observations. The ride felt rough, car has 20's with Pirelli Tires. Do I switch to Michelins or spend more money!! and go with 19" wheels?

BLAM

Lower the tire pressure.

cajerseyboy

When they expire go with MPSS. Noticeably better ride with no loss of traction imo.

What ride are you coming from? If it's a Mercedes E class the ride will be noticeably harsher regardless of what tires you are using.

TorqueChap

Congrats! Now... how about some pics?

MarkG123

I did but front are at 38 rears 46 psi. (Per the door plate) I guess I can take out another 5 psi all the way around.

MarkG123

A Cayman GT4! and it had a better ride. However tire pressures are much lower, 28 front 32 rear.

MarkG123

Will take some pics once she is cleaned up.

oolor13

That's way high. Try 31/34 or thereabouts

Tangerine

Change the car settings for tire pressure to Comfort Mode and it will display the target pressures for you. The values are different for each 911 variant, even GTS and GTS 4 are different, so stating exact pressure values is misleading. Your car will tell you what it should be in the gauges display LCD.

Completely ignore the door sticker. Most cars that's fine, but it's for extreme performance levels which is of course much more extreme on the 911.

I don't know why dealers don't stress this aspect of the car to people. Really the two most important things for new owners is to wait for the oil to get to 150 before you lay into it, and explain the tire pressure options.

Benedict14

Me too ! I'm using the same tire psi - there's blood running out of my ears. I hear a loud squealing noise. People are pointing at my car and running.

Sorry. I couldn't help it. Congrats on the new car. Yes, lowering the Px will help.

96redLT4

Good advice but the only problem is he'll have to go through 2 sets of rear Pirellis before you can replace all 4 with Michelins. I don't know why Porsche has not gone with MPSS for all the 911s
Jim

worf928

This:

... and then set the pressures as indicated. Comfort pressures are also in the owners manual IIRC.

Makes a HUGE difference.

MarkG123

Will drop pressures!
Don't understand why dealer puts 48 psi for delivery!

GSIRM3

Liability reasons. Those pressures inside the door are for full load conditions. Dealer doesn't want someone to take the car out in a full load condition and have a tire issue and try and sue them. This is America you know where if you have a problem of any kind, it's go to be someone else's fault. Dealer doesn't want to be the one at fault.

c_Gio

Congrats! btw