Tire pressure monitoring... - 986 Forum - The Community for Porsche Boxster & Cayman Owners

LoveBunny · 07-07-2008, 12:42 PM

The sticker says 19" wheels, so I assumed that it was correct. Oh, well, at least now I know.

LoveBunny · 07-08-2008, 01:05 PM

Luckily I didn't get charged to find all this out.

The explanation I got from the lady at the dealer is that the computer is set at 36/39 so that's what it has to be. This makes no sense to me. I don't understand why what a computer is set at determines what amount of pressure a manual guage should read on my tire. Maybe I just didn't understand her explanation. I was really tired and recovering from a migraine.

CJ_Boxster · 07-10-2008, 02:29 PM

Quote:

Originally Posted by LoveBunny

Luckily I didn't get charged to find all this out.

The explanation I got from the lady at the dealer is that the computer is set at 36/39 so that's what it has to be. This makes no sense to me. I don't understand why what a computer is set at determines what amount of pressure a manual guage should read on my tire. Maybe I just didn't understand her explanation. I was really tired and recovering from a migraine.

Yours is probably set higher because you have the 19" TT wheels which I assume are wider than 19" CC's and would require afew more PSI to keep the tires from riding on there sidewalls.. just enough so that center of the tire protrudes out more and edges make even contact with the road. When you have too little PSI the center of the tire tread will colapse slightly and the sidewalls will take the grunt of the vehicle weight against the pavement.

LoveBunny · 07-10-2008, 02:34 PM

so maybe what is listed in my door panel is for 19" wheels but not for my specific 19" wheels? i know it does say 19" so that's why I thought it was what I would need.

CJ_Boxster · 07-10-2008, 02:40 PM

Quote:

Originally Posted by LoveBunny

so maybe what is listed in my door panel is for 19" wheels but not for my specific 19" wheels? i know it does say 19" so that's why I thought it was what I would need.

I believe that is the case. You should be good now so long as you keep it at 36 psi.. did you notice it was easier to turn the steering wheel and the roads were slightly more bumpy since the increase in PSI?

LoveBunny · 07-10-2008, 02:43 PM

I really haven't noticed much difference driving it, but the difference was maybe 3 psi.