I keep my air pressure at the recommended psi and hate taking it for service, I always tell them to not adjust as I have and 90% of the time they change it.
I'm just shaking my head. One time at an independent shop they told me they adjusted the tire pressures to 30 psi. I said that's great, but next time read the label in the door jamb which clearly states they need to be at 34 psi. But to have a Porsche technician not know the proper tire pressures for a Porsche vehicle? Shameful.
A coworker of mine got to work and said her van was "riding funny" after having 4 new tires installed at the local tire shop. I checked the pressure for her...my dial gauge only goes to 60 psi and these tires were all well over that. I hate letting anyone else work on my cars.
When I attacked The Dragon in my 2005 CTS-V on the new Michelin Pilot Super Sport in the summer of 2011, I experimented with tire pressure. The car originally came with run flats and wanted 30/30. On non-runflats, that is too low, as you lose some of the extra sidewall stiffness (and thankfully, weight). In normal driving, I tend to prefer something around 34/32 but for continuously aggressive driving (like unleashing all 400hp, then full brakes, corner, repeat for 11 miles), I found I needed to go much higher. I think I ended up at like 38 or 39 cold front and 35 or 36 cold rear. The car responds better at those pressures and traction was more temperature stable.
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