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Tyre pressures

 
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Old 05-14-2011, 02:06 PM
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Tyre pressures

Hello, First real post on the forum so

Just a quick question about ideal tyre pressures on my prelude if anyone could help. The wheels are 18" DOTZ GTR's and tyres are Fullway 225/40ZR18 92W XL.

What is a good guidline PSI to to have them upto?

Thanks
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Old 05-22-2011, 02:04 AM
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Re: Tyre pressures

No more than 40psi IMO. But it'll say 44psi for maximum pressure on the side wall though.
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Old 05-22-2011, 03:14 AM
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Re: Tyre pressures

usually tires are like 32psi
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Old 05-22-2011, 06:30 AM
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Re: Tyre pressures

Thanks for reply, im doing about a 650 mile trip next month on the motorway, 35 all round sound alright?
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Old 05-22-2011, 07:40 AM
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Re: Tyre pressures

i don't know where you're from, but around here its spelled tIre. lol. yeah anywhere between 32-38 is a standard pressure. typically the higher pressure is gonna give you better gas mileage. the lower pressure will be a slightly softer ride. are the differences really measurable? hardly.
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Old 05-22-2011, 08:09 AM
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Re: Tyre pressures

cheers mate yeah im in the uk haha
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Old 06-26-2011, 01:17 AM
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Re: Tyre pressures

Higher pressures for "moar lode capasitee."

For example If your tires is rated to hold 1200lb/ tire at 42psi max, that is the maximum allowed. (4 people x 200 lbs + car weight)
4800 (Gross weight on tires_ - 800 (people) and 3100 Prelude= 900 lbs left to play with, meaning Packages, bodies in the trunk, etc,etc.

The real numbers for passenger cars are less than 1200lbs/tire, usually calculated to cover the Gross weight of the car, the max passengers by 180lbs each and trunk full of goodies. UNLESS you go into load rating: Standard, up to G (semi trucks and crap)

Point of all this? the less you fill your tires, the less you can carry. sure it's comfy and there's less road noise, but if three of your friends hitch a ride with you, you risk damaging your rims, bottoming out and Tire/shock rub. If the website tells you your tires are to be filled to 44psi, go to 38psi, so in the summer the air expands, then you fill in the winter.
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Old 06-28-2011, 01:40 PM
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Re: Tire pressures

On any FWD car if you exceed a certain pressure on the front tires you will start to experience torque steer which really sucks.On my stock lude the max pressure before torque steer seams to be at the manufactures suggested pressure of 32 psi cold so thats where I have them set at. On your tires ,you will have to experiment.On the rears if you are looking for some over steer ,or to put it another way if you want your rear end to rotate around easer, then you lower the rear tire pressure relative to the pressure of the fronts .If your looking for understeer,or to put it another way if you want your rear tires to stick like glue to the road relative to the fronts, then you raise the air pressure to a point above that of the fronts.My car tires in the rear are set at 34 psi cold so as to introduce some under steer because the front tire grip on my ATTS car is so high.You will have to experiment with your rear tires to get it the way you like it.

Last edited by SHDRIVER; 06-28-2011 at 02:31 PM. Reason: change incorrect word
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Old 07-02-2011, 11:07 PM
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Re: Tyre pressures

Ideal pressure means different things to different people. Some want them slightly lower to cushion bumps from crap road surfaces. Others want them higher for better fuel milage.

An advanced driving instructor once told me that manufacturers always recommend pressures that are too low because they want the car to ride a little nicer, and recommended 38-40psi in lieu of the 32 that most manufacturers recommend.

Personally I run 36-38psi. Though also keep in mind that 36psi when it's cold is a different pressure to 36psi when it's hot outside, and that driving around will heat up the tyre, therefore the air inside the tyre thus increasing the pressure further. It's fun to play with tyre pressures for track use, but for road use there are too many variables to get an accurate idea of what we should all be doing.

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i don't know where you're from, but around here its spelled tIre.
And everywhere else in the world it's tYre
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