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What tire pressure with 305's in rear.
I have searched and could not find my answer. What is a good street and track tire pressure to run with 305's in the rear? Should it be the same as the 295's? I have them at 40 psi currently.
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tire pressure should be what the manufacture of the car recommends, the wider tire doesnt really change that. I would start out 5lbs less than that for the track then adjust your pressures accordingly so that you have proper wear on the shoulders of the tires when at speed thru corners amd the tires are up to temp. You want to use the entire shoulder of the tire, anything showing wear to high on the shoulder is over inflated and if your are going past the shoulder tread and onto the sidewall it's under inflated. Your pressures will change constantly thru the day depending on temp, driving style, etc.
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Thanks b911s. I figured it would be the same. I usually go by the door sticker, but was told those pressures are for max load of the vehicle (I rarely have even a second person in the car). I run 40 psi in the rear. Hopefully I will see the correct wear pattern.
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When cold [street]...
37 psi - front 44 psi - rear *According to the sticker on the doorjamb* |
Originally Posted by mdrums
(Post 1976419)
Just follow the owners manual and use 33 front and 39 rear. You get better handling with these pressures on the street. The higher the pressure the more the car can and will slide.
For the track on PS2's depends on the track and how fast your are driving. If you are starting out at a DE don't worry about presures and go with the 33/39. After you start to learn the track and are picking up speed come in from a hot lap and check pressures and keep the front and rear at 38 or so but no more than 40. Actually at the end of my PS2's life I was in solo group and found that 35 hot worked best. My tire pressures at Sebring were increasing by 10psi from cold to hot. Thanks for the info mdrums! |
Originally Posted by MelsM3
(Post 1976066)
When cold [street]...
37 psi - front 44 psi - rear |
I'm with mdrums re: PS2 pressure on the track. Whenever my rear tires got more than 40 hot, the car got real squirrelly. (My car's sticker states 37 and 44 cold.)
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Just wondering, why are rear tires higher than the fronts?
Originally Posted by lardog
(Post 1977152)
Thats WAY to high. 33/39 cold
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Originally Posted by honeybadger
(Post 1977218)
Just wondering, why are rear tires higher than the fronts?
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Originally Posted by MelsM3
(Post 1976066)
When cold [street]...
37 psi - front 44 psi - rear Isn't that a bit much? I don't know Porsche pressures but even Ferrari does not go beyond 39 lbs! |
Originally Posted by honeybadger
(Post 1977218)
Just wondering, why are rear tires higher than the fronts?
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Guys, READ THE OWNERS MANUAL!!!!!....those 37/44 pressures are ONLY for 4 adults with the front full of luggage. More weight in the car on a trip Porsche says to put more air in the tires.
If you use the 37/44 pressures for any type of spirited driving you will end up with too much heat and thus pressure in the tire. Look on the tire sidewall and there is a max pressure stated. IF all you ever have in you Porsche is you and your girl and some luggage stay at the 33/39 PSI cold which is done at 68 degree F. Any change in ambient temp + or - of 68 by ten degrees you can adjust around 1 psi + or -. Again all this is covered in the OWNERS MANUAL. |
I routinely run 33 and 39. It's always higher in the rear because all the weight is back there. That's with no real loads.
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Originally Posted by Edgy01
(Post 2000150)
I routinely run 33 and 39. It's always higher in the rear because all the weight is back there. That's with no real loads.
Why is Porsche so much more? I have seen an 08 TT cabrio showing 40 rear. |
Originally Posted by mdrums
(Post 1977825)
Guys, READ THE OWNERS MANUAL!!!!!....those 37/44 pressures are ONLY for 4 adults with the front full of luggage. More weight in the car on a trip Porsche says to put more air in the tires.
If you use the 37/44 pressures for any type of spirited driving you will end up with too much heat and thus pressure in the tire. Look on the tire sidewall and there is a max pressure stated. IF all you ever have in you Porsche is you and your girl and some luggage stay at the 33/39 PSI cold which is done at 68 degree F. Any change in ambient temp + or - of 68 by ten degrees you can adjust around 1 psi + or -. Again all this is covered in the OWNERS MANUAL. |
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