gillie

Sounds like a Cayenne to me.

Carrera Mike

Not. Carrera 911.
They were being on the safe side when they first came up with the 44/36. Just too hard for unloaded cars. Specially on the track.. slides a lot.

AndyK

This is the most interesting tire pressure thread, because it mentions that 997 tire pressure recommendation is LOWER! I feel like stock 36/44, or even lower 34/42 pressure is rattling my car to death on the junky NJ roads. I've also read that stock 44 for the rear causes uneven premature wear.

Other threads suggest lower pressures cause tires to flex more and wear out or even blow faster than the stock high pressures.

I'm gonna try 33/39 for the street and highway. Any objections?

Barn996

Are you on 18"s? My 17" call for 36 psi all around, but I dropped the front to 35psi. Try 33/39 and adust up or down based on ride and/or tire wear.

AndyK

I should have mentioned I'm on 18's for the summer/fall, but switch to 17's for winter. Why the big difference in factory pressure recommendations from 18" to 17"?

fpb111

More sidewall on the 17"s

kristyhana

I never checked the pressures when I bought the car, but quickly took to an indy shop for alignment and he bumped the pressures up to 36/44. I don't know what they were before, but she told me that if it felt too hard I could lower to 40-42 in the rears, but honestly I can't even tell the difference.

I just want the best pressure for longest tread life- what do you guys suggest? (just reg street/highway driving)

Barn996

Reccomended PSIs in OM.

Schützenweber

That's what I maintain on my PZeros for over 1.5 years of regular solo driving.

AndyK

Looks like the consensus is the factory settings are safest, but cause the rear tires to wear prematurely. 33/39 seems to allow more even wear.

Pac996

In the wet more pressure reduces hydroplaning. The front would be my main concern in the rain ie Oregon or rainy run times.

Rob996

This tread is pretty funny so far!!! Tire pressures are such an imprortant component of the cars handling ability with the enginneers at porsche investing countless hours getting this right. Not only for handling but for safety as well...

Anyone running r-compound tires on the track will agree getting the right tire preassure is much more challenging, even from right to left as well as front to rear.The impact the tire pressure has on the handling is crazy.

Good luck, and be safe...

Zookie

As per 997 TSB (DEC 2009) 997's are Heavier than 996's.

For 18" and 19" Wheels w/ Summer or Winter Tires

Half Load 33f and 36r PSI

Full Load 36f and 43r PSI

This is what i Run

BruceP

I run the recommended pressures. To me, lowering pressures to solve a ride problem is a pretty heavily compromised bandaid. That rear pressure is meant to carry the weight of the engine, and it's a significant component of Porsche's solution to trailing throttle oversteer. I want that.

Some may recall that I replaced my shocks awhile back after I found one of the OE shocks leaking. I didn't want to lower the car (Toronto peeps will understand why), so I ended up going with Bilstein HDs and the OE springs. The Billies were far better damped than the OE shocks, both over high frequency bumps and when rebounding from sharp impacts. The crashy ride was solved, without anything being softer. I mention this only because I think it's possible that what people are experiencing as a "harsh ride" might actually be lousy rebound damping from worn OE shocks.

Jacks911

If it is Harsh Ride you are trying to solve - Please take a close look at tire Age.
I assume most know this - but I will share my story. Purchased a 2000 C4 a few months back. Picked up the car in LA & drove home to Seattle. It has a TechArt Coil-over suspension so I assumed the Harshness of the ride home (so much it blurs my vision) was all related to this. At home, took a closer look at tires and see they are Conti 2's and 9 years old. Still had 70% tread. I suspect the prior, prior owner of 7 years used 18 inch wheels and had these tires & 17 inch-ers in the garage for all those years & put back on for sale. Bottom line - purchased the new Conti Extreme DW tires in OEM sizes - and the C4 is transformed! Yes the ride is Firm over dips - but the Harshness is gone. Even the shocks of hitting road paving cracks & Rail lines is absorbed. Those road edge warming strips - are just noise now - not a massage. Check the tire age - as Many low mileage Porsche have old rubber. And as far as I can tell the DW tires have the same or better grip as the former Conti 2's, should be way better in the rain, and compared to the 4 year old Potenza's on my 968 ride better & quieter.