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> Optimum Tire Pressure
migo84
post Aug 5 2006, 12:48 AM
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Does anyone know the optimum tire pressure for my 2003 outlander AWD?

I will be going on a one day roadtrip... just wondering where should it be at for performance and safety. :unsure:
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Stig-Helmer
post Aug 5 2006, 04:03 AM
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It's the pressure that keeps u'r tires in shape... To little air can't press the sides and stretch the contactsurface so it will be worn out at the tirewall's.... And offcause higher fuelconsumtion.. To mutch air will result in werry high censitivity against small crack's in the asfalt and small stones on the road... It's better to hawe to high than to low preassure...But to high makes the ride bumpy... Werry low preassure is dangerous.. U get the feeling that it's slippery on the road and u loose contakt with the road faster if u have to avoid a dog or so..

But to get back to u'r question.... Users manual can help u to find the right preassure for a special load in u'r car. from one person to 5 and with different loads in the back...... Ewen at the side of u'r tires u can find help..... Driving alone and no stuff in the back of u'r car and in speed around 110-120 moastly means that a lower preassure will give u the best comfort... But if u drive on autobahn at +200km/h u need alot more preassure to make the tire stable... If u'r tires get werry warm then the preassure is to low.....
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Guest_Outlander1_*
post Aug 5 2006, 10:19 PM
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I run 36PSI all around. It seems to help a bit with rolling resistance and therefore fuel economy. I was worried about handling and odd wear when I first boosted the pressure but I like the handling. It tracks true and feels nimble for the tank that it is. No strange wear patterns yet and it is at 24000. I would say the tires will be ready for changeout at 40000 which is about par for all the cars I have had. I think rotation every 10000 or less is exteremely important too. I do it at 10000 which always seems to get me the 40000 which is good enough.
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Stig-Helmer
post Aug 6 2006, 02:18 AM
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Rotate tires is more important when driving a 4 wd... To big differens will put some extra stress on the clutch between front and rear axle.... My old galant turbo with front wheel drive i used to wear out 2 tires (front) ,so i just had to buy 2 new tires at the same time.... But now iam domed to buy 4 new ones...haha. It semes like 40000 km wont be a problem to get... My wintertires has 8000 km and whit some careful measurement i can se witch 2 tires that was at the front axel... But only by looking at them its impossible to se the diff... Here in Sweden there is a law that says that wintertires must be mounted from 1 december – 31 mars.
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conanofcimmeria
post Aug 6 2006, 08:16 AM
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open your drivers door and there is a tyre pressure decal listing your desired pressures whether loaded or empty.the labels are usually in bar.most mitsis run around 2bar which is about 30psi.too little causes tyre roll and outer edge wear.Too much causes excessive center wear on the tyre
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Stig-Helmer
post Aug 6 2006, 11:38 AM
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Wrong!!! To much pressure only results in bad comfort...Its the pressure that keeps the whole contaktsurface strait...No tires these days are able to blow up like a baloon...Its the sides of the tires that stretches out the contact surface... Center wear is not something that exist.... Is there anyonoe out there that has seen a tire worn out in the center??? Unless its a motorcycle tire.....

In F1 racing or dragracing or ewen driving in snow the pressure is important due to friction...But for us when driving around 50-120 km/h is comfort more important than maximum traction.... If pressure in tires where that cencitive we all had a compressor built in our cars with possibillity to inflate when driving.. The pressure enough at 0 C degres would cause werry hig preassure diff at 25 Celsius. And to keep a constant pressure we had to change pressure all the time to keep it constant.... High speed automatically makes tires warmer but not enough to compensate a much to low pressure. A Correct mounted tire at the tireshop is to pump the tire to 1,5-2 times as high as needed and then mount the valve after a freflow back to recomended pressure... And looking at the tire when its twice the pressure does not make the tire look as a baloon... Why they should owerfill the tire is to ensure that its fully expanded on the rim's... Just add another bar... say from recomended 2,5 bar and put one extra bar inside tires and take a ride.. More gocartfeeling but one small stone on the road will feles like a big rock and the sound from tires will be like rolling a emty barrel's..... So in normal drive the pressure is a comfort issue... And the only thing that is important is to NOT HAWE TO LOW PRESSURE
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crazy_horse_uk
post Aug 7 2006, 01:52 AM
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I've run at 30 psi from new. It seems too low, but I just passed 49,000 miles this weekend on the original set, so 'nuff said!!

chuk
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conanofcimmeria
post Aug 7 2006, 04:54 AM
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well stig you asked and I shall reply.I do primarily alignments and find that in almost every case of central tyre wear I find the tyres overinflated.particularly 4x4 vehicles.going slightly higher is functionally ok as where I come from in canada the standard tyre pressure is 32psi.outlanders are extremely sensitive to premature tyre wear and therefore I would not vary too far off recommend tyre pressure of 30psi.of course at the end of the day the old line is :to each thier own.
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Stig-Helmer
post Aug 8 2006, 10:36 AM
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I just had to check my tires at a tireshop.. Mine are owerfilled BY OWNER!!!
2,2 bar is recomended by mitsu. + one extra 0,5 bar if driving faster than 160 km/h.... I hawe had 2,8 bar (2,2+0,5 and then an extra 0,1bar) for 19000 km now and still have 5,3mm in front tires and 5,5 mm left at the rear tires... first 7000 km my front tires was rear tires...Next summer ill change again.. And there is just 0,16 mm in diff at the moast on all tires... By loocking there is no diff at all and tread depth is the same inside center and outside... Moast diff is the inside of front tires..(fast corners) .But still the diff is like a fart in space...
Usually all cars are recomended the lowest press that any tire manufactor can garanty... The first test drive u do has to be smoot and the first impression is important to even sell a car... However... Driving fast with ex 1-1,5 bar will cause extreme centerwear because the low preassure is unable to straiten out the contact surface..(hawe u heard that before?) Centrifugal forse is greater than the sidewalls capacity at low pressure.. To owerfill a 215/17 geolandar u need twice as recomended 2,2 bar...Then u might notice center wear after plenty of km... But adding more than a half bar extra is no problem... So in u'r measured psi and adding 2 psi is also a fart in the space... Center wear comes moast likely from having to low pressure and moastly long and fast higway drive,Rather than from a owerfilled tire.... Who drives around with 4,4 bar (+60psi) in a simple car??And then iam back to sidewalls... Preassure is straighten the contact surface..... And preassure is a comfort mather... 2,8 bar is close to 40 psi..... So give a warning of centerwear for a few psi semes not close to the realistic world we live in..... A new geolander tyre has 791 rew's/ us mile... Thats 791 rews a minute at 60mph (96,5 km/h... Thats quite low speed on a drillmachine but at a 17 tire the outside will get some G forces.... Thats the same force that makes a dragstertire bigger and works like a extra gearbox.... I also wonder who told u that outlanders are sensitive to premature tyre wear?? Micael Shumasher?? Mitsu's 4wd saves tires..

On top of this page to the right u find a english flag..Then u can convert anything from coocking to torqe... http://hemsidor.torget.se/users/b/bohjohan...vert/conv_s.htm
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