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YOUR RESEARCHTire Pressure
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Run 32 and 36
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Suggestion
That means that pressures should be checked before even moving the car.
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Having owned my first Porsche for about six weeks, I keep getting conflicting advice about tire pressure.
A track oriented friend says 30 PSI all around. The book says 36 and 44. I'm running 32 and 36 on Kumho Ecsta ASX's. (I know they are not viewed with great respect around here). 225/40's in front, and 265/35's in the rear on 18" wheels.
I'm mainly interested in some opinions on pressures for street use.
Thanks,
Zman
I go with what the door label says. That's the advice I was given and that is what I use. Car feels very comfortable at 34 in the front and 40 in the rear.
Jay
I go with what's in the manual - 44 psi rear and 36 front. For street use, I don't try to second guess the factory. For autocross I go run 39 rear and 40 front. I have Dunlop Sport SP9090 225/40 front and 265/35 rear. Mine is a '99 coupe tip with base suspension. Any suggestions about autocross psi's are welcome.
Track and street are two different environments for tires, that's why you are getting conflicting recommendations. For the track, especially if using R-compounds, you need to heat up and sustain the heat for the tires to have optimum traction. Track heating the tires is best achieved with lower cold pressures, which heating then coincidentally significantly raises the pressures. Hence the need to check for "HOT" pressures. Street drivng, OTOH, rarely raises tire temperature or pressure to the same extent, and street tires do not REALLY need optimum heat for optimum traction. The factory recommended pressures are for street tires driven on the street in a wide variety of driving environments. For regular and even spirited street drivng on street tires, stay with the factory recommended "COLD" pressures, 36F and 44R. You'll get better mileage, protect your wheels, and can cope with a wider variety of drivng conditions at anytime.
Weird, I had been running the exact factory setup and my rear tires worn out in the middle way ahead of the sides. Isn't that signs of running an overinflated tire ?
I've now droped 2 lbs on each tire and will see when the new one wears out how I've done.
I recall reading here that the factory specs are way too high ???
I use the same pressures as Paul. Whenever I'm driving my car, it's always a bit more towards aggressive rather than conservative. And, as remarked upon by mbergeron above, I was noticing some wear in the middle of the rear tires. The key here is that Porsche's recommendations are for dead cold air in the tires. That means that pressures should be checked before even moving the car. Then again, I'm using 34f/42r dead cold. So far, wear looks a bit more even. Then again, what do I know: I never have a second cup of coffee at home!
