ENCT

Any idea why they have the tire pressure for 911 GTS, 911 4 GTS, and 911 Targa 4 GTS at 31 for the front and 36 for the rear in comfort mode, and they list the Turbo and Turbo S at 34 for the front and 43 for the rear? The tires are the same size and both are for comfort mode?
Thanks,
Eric

radar979

TT/TTS are heavier???

the_buch

They know you'll be going even faster and want to cover their a$$

abiazis

my 2017 TTS says 38/48 on the door info decal......

Penn4S

I have the TTS on Michelin 4S. I run 31 front and 34 rear. Car rides better and IMO handles better.

ENCT

I was a car back from yours on Tuesday at POTML, Tim said I just missed you. That's the pressure the dealer put mine at and they feel good. I thought the manual seemed high to me, I was curious if there was a reason. Thanks for the input.
Eric

Randyc151

They tell you to run those high pressures because they want to cover their butts if you load the car down with max people and luggage and run over 200mph. Alternatively, if you run it at 32 front, 35 rear, the "Comfort" setting in the TPMS is happy and does not give off any warnings, so that means it's safe. Do not run the tires at the high setting, and ignore the dealer...they don't understand these cars at all.

Penn4S

Sorry I missed you Eric. Next time, looks like we are on the same timing.
I've been ruining at these pressures since I had the TTS and MP4S. I ran the same on my previous 991 4S.
More comfortable ride and I think the tires perform better.

abiazis

With these lower pressures do you have excessive or premature wear on the edges of the tires? That has been my experience with my previous 4S...

Jim M.

The door placard is not the comfort setting. You have to go i the manual to find the comfort settings.

Penn4S

No I have not. At the higher levels I find the ride jarring and the performance/grip compromised.

abiazis

Thanks for all the feedback........to the manual for comfort setting

hcvone

I run 32F/36R cold, that gets them to 38F/44R hot how I drive

the_buch

I have no idea if there's anything to this, but I read somewhere on Rennlist once that the right cold pressures result in a 10% increase when fully warmed up - i.e., if the increase is greater than 10% you're running too soft as the related rolling friction is higher than it should be and therefore generating excess heat, and if the increase is less than 10% you're running too hard??? It is notable that Porsche wants the pressures way up there if you're going to be on the autobahn.

CrazyFast

So I've owned my TTS for a year now, and have always had the pressure at 41/46 and found the ride pretty jarring, especially on the highway. And, recently had the car in for annual service, and the dealer kept those pressures.

After reading this thread, I adjusted the pressures down to 31/36, and it's a world of difference. Feels like a new car with WAY better traction and much more comfortable ride.

Irony is that I always adjust tire pressure into the low 30's (hot) on track with my GT4, just never thought about it with the TTS. Huge SMH moment for me. Thank you all for the thread and great advice!