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Old 03-14-2005, 09:11 AM   #1
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Tire Pressure

Hey Guys,

New to the site and enjoy it tremendously.

I recently took my 2002 ZX3 in for service. Tires were making a thumping noise in the rear, at low speeds and Ford chalked it up to a flat spot on the rear.

Anyway, the technician put about 40 psi in the tires, isn''t that way to high? Especially in Florida weather? He said you can put that much in low profile tires, but I am doubting 42 can be good for the tires. I usually put 32 in all 4? The door says 34.

Thoughts or comments? What kind of pressure should be in these tires? Does it make a diffeence that I'm in warm Florida?


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Old 03-14-2005, 10:16 AM   #2
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what size are your tires?

as for me, i have 215/45/17's and run 45psi ( and i'm in Central Florida )

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Old 03-14-2005, 10:25 AM   #3
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low pro's are a much much stronger tire. you can put up to 90 psi just to set the bead. the sidewall is so small it takes a lot to force it out. the tag on the door refers to normal tires, which you should never set a bead at over 40 psi. but you should be fine, i run 34 front 36 rear because it can cause the back end to slide before the front which, in my opinion, is easier to control. i hate the feeling of the front floating through a turn, so i counter it in that way.

hope this helps.
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Old 03-14-2005, 10:34 AM   #4
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Old 03-14-2005, 01:54 PM   #5
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I have the original Firehawks on the cars, which are 205/50/16s
On the tire it says a max of 44 psi.
So you think 42-44 running in all four tires is on target?
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Old 03-14-2005, 01:59 PM   #6
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You should always start with the manufacturers suggested tire pressure. You can go as high as the max indicated on the sidewall of the tire. This number represents the pressure needed to acheive maximum load capacity which you rarely will ever need for a car...trucks are, however, a different matter. Its ok to experiment between these two numbers. For autocrossing its not unusual to increase the tire pressure 5 to 10 lbs per tire to get the best performance. It takes a lot of experimentation. Autocross guys generally use two methods. The first and most accurate is a pyrometer which is used to take temperature measurements across the face (both edges and center) of the tire. They adjust the pressure until they get even temps. The poor mans method is to use chalk or white shoe polish on the sidewall starting at the tread. If the sidewall is soft some chalk or polish will be worn away on turns. The idea is to adjust the pressure until just minimal wear of the chalk mark or polish occurs. A good driver will record this hot/cold PSI, road surface temp and air temp so it can be easily duplicated in the future. While you could drive these pressures on the street they may be very uncomfortable.
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Old 03-15-2005, 10:58 AM   #7
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depends on the tire what is your max psi rating. Hell man i run mine at 30 and 32...
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