I know this seems like a silly question. I'm new to my Turbo S, and and there are a few different tire pressure recommendations in the manual.
I'm usually by myself in the car, sometimes with one additional person. Don't plan on packing it with heavy luggage/gear. All street driving...no track.

Does 36 front, 42 rear sound ok for daily driving???

Thanks!

 

It depends...what tires are you running?

 

I have the OEM tires. Michelin Pilot Sports in 19". Thx!

 

I've run 37psi front / 44psi rear (recommended by the doorframe sticker) for street and autocross and been happy. Usually warms up to about 39/46.

 

This is for full load if I'm not mistaken, at least on 997.1 it is. Partial load should be 33/39.

 

I was also looking to get tire pressures that create a good overall tire wear for daily driving. That's why I chose "middle" numbers of 36/42. Just wondering if that's ok and wondering what other people's experiences are.

 

I run 34/40 and have been very satified with it for the last 18 months or so. I too went with the "middle" numbers.

 

I'm running cold 30/34. Warms up to 34/39. Lower pressure seems to make the ride more comfortable. However the annoying thing is tpms keep on beeping me. Any idea how to disable it?

 

My humble opinions for OP. YMMV and hope this helps:

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https://www.6speedonline.com/forums/...-turbo-16.html
What is the best tire pressure for the Turbo on street tires? This topic has been discussed several times on this board, so here are some info and my humble opinions for those new to this car:

1. The "correct" tire pressures for the Turbo are NOT those numbers on the door panel. These numbers (37/44) are not just high, they are way too high and represent the **maximum allowed** tire pressure for a fully loaded car. The correct pressure recommendation is in the manual page 289: 33 front , 39 rear, at 20 degrees ambient temp.

2. The best way to adjust the Turbo tire pressure? For regular street driving, use the on-board computer - instruction on page 114 of the manual. Set the tire to Summer, set the load to Partial Load (this is the key). Then check the differential reading: maintain this at 0 throughout. The car's OEM tire pressure monitor tends to over-read by 1 to 2 psi (for example, when it reads 30, the real pressure is 32) so I actually run mine at minus1 or so, but that's another story. For most people new to this car, 0 throughout is a good start. In Southern California weather, my car typically starts out around 31/37 in the morning, then becomes 33/39 after a few minutes of driving.

3. If you find yourself over-inflating the tires to make it feel right: it's quite possible you are unconsciously stiffening the tires to compensate for the very very soft spring rates of the stock Turbo. The stock car has too much body roll and lazy steering response and one way to improve and stabilize this defect is stiffening the tires - that's why it feels "better" with over-inflated tires. This of course is not the right way to do things; for one, tire traction is not good when tires are over-inflated. If you think you fit in this category, the proper correction is in that Bilstein thread in my signature LOL.

4. I use a digital pressure gauge like this one http://www.amazon.com/Deluxe-Longacre-Digital-Pressure-Gauge/dp/B004BOH7CU (there are cheaper versions) as a reference to make sure the car's system is correct. As mentioned, I've found that the car over-reads by 1 to 2 psi, and I believe others on this board in general have observed the same.

5. Remember tire is part of the suspension system, and tire pressure could be adjusted, **within reasons**, to influence understeer/oversteer behavior. Soft front tires promote oversteeer, stiff front tires promote understeer. I wrote "within reasons" because tire pressure of course also affects traction, so I don't think it's a good idea to over-use this feature. FWIW I run my differential reading about -1 in the front, and 0 in the rear, for all the reasons I mentioned in 1 to 4 above.

 

Wow. Great write-up. Thanks!

 

^^^You are very welcome if it's my post you are talking about.

 

Good to know! Sounds like I'd better let some air out...

 

Cannga is right on, and has great advice.

On temp related changes, ADias posted this some time back, and I still use it today. Keeping in mind a few things: road conditions, driving style, comfort, temp, and load in vehicle, this may help.



Bottom line, try what you 'think' will work and see how the ride/performance is. Adjust accordingly. I have rarely ever run my '09 at full load numbers.