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Old 04-21-2006, 05:53 PM   #1
freedomflame200
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Default tire pressure?

i got the fuzions hri's and the shop that installed them put 30 psi in front and 26 in the back. the max psi is 44 .... i dont know that much about tires and such but is that proper for my car/tires and the way i drive? i deliver pizza mostly on paved potholey backroads at 40-60 mph (cant have late pizzas)

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Old 04-21-2006, 06:46 PM   #2
Titanium48
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Default Re: tire pressure?

Those are the standard inflation pressures for Saturn S-series cars. You will get better handling and fuel economy at somewhat higher pressures at the expense of a bumpier ride. Don't go all the way to 44 psi though, that is too high. I think optimum cornering grip occurs somewhere in the mid-30s.

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Old 04-21-2006, 07:08 PM   #3
ym42
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Default Re: tire pressure?

That is the right pressure. More pressure will cause your wheels to lock up more easily when you hit the brakes in emergency, especially if you do not have ABS. Also, if you have bigger tires with higher load capacity ( in case you put 205 size ), you can get away with even less air pressure than the manual says, not that you have to.

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Old 04-21-2006, 07:45 PM   #4
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Default Re: tire pressure?

I have always run my SC2 (and prior to that my SL2) at 30 front, 26 rear as indicated on the sticker. The car handles great and I have exceeded 40MPG on the highway, so it isn't hurting my gas mileage any.

Running them higher might give you better mileage, but it will reduce the contact patch between the tire and the road, which won't increase your handling, not to mention the fact that your tires will wear faster in the center than the sides. Less tire touching the road means less traction.

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Old 04-21-2006, 09:06 PM   #5
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Default Re: tire pressure?

Quote:
Originally Posted by freedomflame200
i got the fuzions hri's and the shop that installed them put 30 psi in front and 26 in the back. the max psi is 44 .... i dont know that much about tires and such but is that proper for my car/tires and the way i drive? i deliver pizza mostly on paved potholey backroads at 40-60 mph (cant have late pizzas)
as long as they have a load index of 87 or more then use 30 psi front and 26 psi rear. if the load index is less than 87 then you need to put more air in them. also if you are autocrossing on them you would need more air for sure.

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Old 04-22-2006, 04:41 AM   #6
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Default Re: tire pressure?

is that the standard tire pressures for all saturns ? I never really checked cause after (a long time ago) I had my tires installed from a shop they said to keep it at 35psi all around, if its supposed to be 30 front, 26 rear that what I should put mine at. My car slides around VERY easily in the rain, maybe this will remedy it

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Old 04-22-2006, 06:26 AM   #7
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Default Re: tire pressure?

Quote:
Originally Posted by BullyCanadian
is that the standard tire pressures for all saturns ? I never really checked cause after (a long time ago) I had my tires installed from a shop they said to keep it at 35psi all around, if its supposed to be 30 front, 26 rear that what I should put mine at. My car slides around VERY easily in the rain, maybe this will remedy it
I think all S-series were designated 30f/26r, but I could be wrong. There should be a sticker either in the trunk or inside the driver side door.

...
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1999 SC2 118,537 miles ('98-'12)
2005 VUE 25,705 miles ('05-'09)
2008 Astra 27,014 miles ('09-'12)

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Old 04-22-2006, 02:13 PM   #8
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Default Re: tire pressure?

Quote:
Originally Posted by Titanium48
Those are the standard inflation pressures for Saturn S-series cars. You will get better handling and fuel economy at somewhat higher pressures at the expense of a bumpier ride. Don't go all the way to 44 psi though, that is too high. I think optimum cornering grip occurs somewhere in the mid-30s.

Depends on the tire. High performance anything holds best, lasts longest, and feels "tightest" at around 39-40, if max is 44psi. My Falken's max was 52psi, and I kept them at 51. Ran NICE. Of course, I like to feel any tiny pebble I drive over. Some don't.

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Old 04-22-2006, 02:25 PM   #9
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Default Re: tire pressure?

Quote:
Originally Posted by BullyCanadian
is that the standard tire pressures for all saturns ? I never really checked cause after (a long time ago) I had my tires installed from a shop they said to keep it at 35psi all around, if its supposed to be 30 front, 26 rear that what I should put mine at. My car slides around VERY easily in the rain, maybe this will remedy it
that's the standard tire pressure for S-Series Saturns. Look at the sticker on the door. forget what the shop told you unless they have "Saturn of" on the front of the building 35 psi in an S-Series makes for a stiffer bumpier ride. it will probably slide more in the rain now...

...
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Old 08-04-2015, 09:39 AM   #10
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Default Re: tire pressure?

I once heard that the factory tires only had a max psi of 35.

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Old 08-04-2015, 12:14 PM   #11
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Default Re: tire pressure?

Quote:
Originally Posted by Bdpennington View Post
I once heard that the factory tires only had a max psi of 35.
I have my second set (of O.E. Firehawks) on spare rims they are 1190 pounds at 35 psi max.
The tires I have now are 1135 pounds max. They seem best at 34 psi front.
Quote:
Originally Posted by eRic 02sc2 View Post
as long as they have a load index of 87 or more then use 30 psi front and 26 psi rear. if the load index is less than 87 then you need to put more air in them. also if you are autocrossing on them you would need more air for sure.

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Old 08-04-2015, 06:23 PM   #12
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Default Re: tire pressure?

Quote:
Originally Posted by freedomflame200 View Post
i got the fuzions hri's and the shop that installed them put 30 psi in front and 26 in the back. the max psi is 44 .... i dont know that much about tires and such but is that proper for my car/tires and the way i drive? i deliver pizza mostly on paved potholey backroads at 40-60 mph (cant have late pizzas)
you obey the sticker which states that on the door jamb. the tires are used on a lot of other cars as well, but all cars use their own specific tire pressure taylored to their specific weight & handling...

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Old 08-04-2015, 07:50 PM   #13
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Default Re: tire pressure?

I currently have Sumic GTA 195/60-15 installed with 41.5k miles with lots of tread left running about 40psi all around.

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Old 08-04-2015, 08:35 PM   #14
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Default Re: tire pressure?

This is very interesting. I have Toyo Extensa at 33-35 all around. Never even thought about going other than tire recommendation.

This is where they were after shop mounted them.

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Old 08-04-2015, 09:00 PM   #15
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Default Re: tire pressure?

not all tire shops employ or lots of other shops for that matter employ certified mechanics as they command big bucks. a lot of them do what walmart does, employ knuckleheads who don't even know how to properly tighten an oil drain valve plug as they love to strip the threads. tire pressure recommendation is always on the car's tire placard inside of the door jamb. those who over inflate their tires over the recommended placard just cause a rough ride & uneven tire wear... to each his own though...

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Old 08-04-2015, 09:16 PM   #16
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Default Re: tire pressure?

Look on the side wall and note the max cold pressure and the max load rating. Now from that info and using an inverse exponential decay curve estimate the pressure for the individual wheel load. 750lb each front wheel and 500lb each rear wheel with no passenger and luggage load in the car and increase pressure proportionally for the load as it is on each of the tires evenly. That means that a total additional load relatively evenly distributed of 400lb total adds 100 lb to each wheel load.

http://www.revisemri.com/tools/timeconst/1_exp_x400
1.0 on the graph is max pressure and 2000 to 0 represents the wheel load with 2000 being the max rated load. There is math for this but fitting it to the curve will be easier and works well to find the starting point.

Do not load the car to exceed the max tire load at max cold max pressure.

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Old 08-04-2015, 09:33 PM   #17
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Default Re: tire pressure?

I do about 34-35 front and 30 rear

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Old 08-04-2015, 09:39 PM   #18
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Default Re: tire pressure?

That is some splodey head stuff right there. I'll probably drop my back down a few because it does feel a bit harsh.

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Old 08-04-2015, 09:43 PM   #19
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Default Re: tire pressure?

Generally speaking a 4-5 psi difference front to back and the fronts inflated to the point it does not feel squishy when you turn corners works.

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Old 08-04-2015, 09:50 PM   #20
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Default Re: tire pressure?

Most of my automotive experience centered around big blocks and big tube headers melting pavement until the Saturn. Pressure in the Mickey Thompson cheater slicks and pizza cutter fronts were an afterthought and clorox made smokiness.

...
Bill from Middle Georgia
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