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Old 12-11-2009, 07:30 PM   #1 (permalink)
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Question Vitara Tyre Pressure?

Hello,

I just bought a 97 vitara 3 door and checked the tyre pressure. They were all 36psi.

I read the manual and the sticker on the door says 23psi for front and rear.

Should I lower my tyres to 23?

Or do you guys run at a higher pressure on road for economy?

Will it damage my car running much higher than the 23 recommended by suzuki?

Thanks
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Old 12-12-2009, 12:07 AM   #2 (permalink)
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The problem is those aren't the tires that it came from the factory with... only reason its printed on the door was for liability reasons.

What does your tire read as maximum psi (make sure a tire is not a different brand as most are different). Then find the specification chart from the maker for your gross weight and go that route.

My method is whats inbetween... what is the maximum and i'm not driving on snow so I go with what would be about 10-15 PSI under max when around 70F outside. More inflated the tire = the harder it is to brake especially on a wet surface. The lower the more friction and easier breaking and softened ride... vice-versa.

Hope I helped.
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Old 12-12-2009, 12:38 AM   #3 (permalink)
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stock tires?, stock size.?

door jam num is for stock and nothing else.

all tires have a load /pressure chart. www. my tires mfg dot come.

if you run high pressures
the MPG improves,
the bottoms crown (loss of traction and braking)
and they wear in the center first.

low pressure.
loss of traction due to cupping.
too much side wall flex.
tires can pop the bead if you do violent manuviours.
very dangerous (see new cars with tire pressure monitors (a pain to fix) just because ppl dont take care of cars.

codyj split the diff ,is a good starting place.
36 is the max for running on the biggest car it fits and for seating the bead.
i bet yours is between 23 and 30.
but i dont know size

in the old days we didnt have tables so we drove car guessing the pressure.
using a tire , wear guage. look of under or over wear in the center of the tread.
i could get it plus or minus 1, psi . but tires wore faster then.
now they have much better ways, with a skid marks analysis and the like.
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Old 12-12-2009, 01:05 AM   #4 (permalink)
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I have two tires on my car that say max PSI are 44psi and the other are 35psi... mix-matched set yes. Looking to mount worn 235/75/15 on a 2wd model auto for low rpms. They have worn evenly and still have a few thousand miles left.

Hoping to break even with auto mpg and the little more weight and such with it all.

1 thing is you say they were all at 36, so finding the max psi and then determining for yourself does it brake and accelerate fine in wet weather (is my best sugguestion...) as when you need it most it will be waiting for you.
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Old 12-12-2009, 07:48 AM   #5 (permalink)
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Have a look at this thread.

I know the title doesn't suggest it relates to your problem, but as you read it you'll discover that the reason why Bex is skidding is the tire pressures in her tires is too high (and so are yours).

The discussion switches from brakes & skidding to tires & tire pressure in the fourth page and continues from there.

Last edited by fordem; 12-12-2009 at 07:57 AM.
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Old 12-12-2009, 12:00 PM   #6 (permalink)
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Just to add, dropped from 32 to 26 on all tires, and traction much better. As I am not carrying any heavy load (heavier load, then increase pressure), 26 seemed fine. Not only that, but with 32 psi, teeth were shattering on our terrible roads, ride way to stiff for old chassis, etc. I have not really seen a drop in my mpg, maybe 1 mpg or so? Not really sure on that. But certainly recommend lower pressure. Aside from liability, psi listed on tires is MAX. Everything in moderation, please.
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Old 12-12-2009, 01:25 PM   #7 (permalink)
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max is max. worst case no matter what. max.
it considers too, heat and load , worst case. for sure.
load, speed, heat. all are factors.

no reason at all to run max. not on this tiny car.
the lazy tire dealers , leave the tires at max, (seating pressure) so dont let them do that.
go home and set it to the correct safe value. so the car has full traction.



look at your tire removed.
put a ruller on the tread, see the crown.?
when you put weight on the the tire, you want this crown to go to zero perfectly.

how to find tables is the issue for me. (love to link them)

but the mfg does have tables, prying them out of them is the issue
everyone wants to point fingers at the other guy.

MFG car >>> tire maker.
tiremaker >>> car maker...

its a game of lawyers. you in middle.

diff tires have diff, behavour and have flatter stronger thead and or more flexible side walls. depends.
LT235 are stiff allways. and all LT tires have tables published.
those P205 , P215 tables that are hard to get.


i think they do it on purpose, set it to max (mine was at 44psi ,illegal, via les schwab tire co.)
they set them there (speculation) because the lawsuits are cheaper, with high than low pressure. (simpletons?)
just ask them the correct pressure and watch them squirm. what is pitty.
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Old 12-12-2009, 01:26 PM   #8 (permalink)
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like cody says, politics. (multiple sucking leaches)
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Old 12-12-2009, 02:55 PM   #9 (permalink)
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Quote:
Originally Posted by Vitara97 View Post
Hello,

I just bought a 97 vitara 3 door and checked the tyre pressure. They were all 36psi.

I read the manual and the sticker on the door says 23psi for front and rear.

Should I lower my tyres to 23?

Or do you guys run at a higher pressure on road for economy?

Will it damage my car running much higher than the 23 recommended by suzuki?

Thanks
The 23 psi recommended is to reduce the rollover risk from jerking the wheel too hard in an emergency lane change, knee jerk from the bad press the Sami got. I have the stock size tires and run 28-30 psi and have no problem with center tire wear or outside cupping.
B95
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Old 12-12-2009, 06:14 PM   #10 (permalink)
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Thanks guys.

I lowered them all to 23 cold and it was a much more comfortable ride, however the steering is really stiff.

I'll give 28 a try

Trial and error for the sweet spot.
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