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Old 01-08-2010, 11:38 PM   #41
MINICooperS
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Default Re: Tire Pressures for S Series

36psi all around, rotate every 5K, 36mpg, I'm on 4th set of tires (Nitto) at 233K miles.

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Old 01-08-2010, 11:54 PM   #42
Derek McNelly
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Default Re: Tire Pressures for S Series

I'm running mine at 44 psi, which is the max rated for the tires.

I've got a slow leak in the front left tire, so I have to check it every time I fill up. Usually top it off then as well.

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Old 01-09-2010, 09:45 AM   #43
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Default Re: Tire Pressures for S Series

about 34 x 4 on the highway
yes it rides a little stiffer but gets better gas mileage and I drive like Grandma anyway

"I've got a slow leak in the front left tire, so I have to check it every time I fill up" - scary, who knows when it will become a FAST leak!

I worked for AZ dept of trans, saw many roll-over accidents, many were from blow-outs or underinflated tires becoming HOT and failing.

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Old 01-09-2010, 12:42 PM   #44
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Default Re: Tire Pressures for S Series

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Originally Posted by MikeNW View Post
"I've got a slow leak in the front left tire, so I have to check it every time I fill up" - scary, who knows when it will become a FAST leak!
If I could afford new tires, trust me, I'd get 'em. It's not anywhere near as bad as it sounds. It's something like a 5 psi drop every week or so, so I just top it off when I get the chance.

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Old 01-09-2010, 02:28 PM   #45
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Default Re: Tire Pressures for S Series

Whee! The thread lives!

Quote:
Originally Posted by CND_SC1 View Post
By all accounts the Altimax HP is an excellent tire. I'm also assuming it's in a 185 or 195 width? (I don't think they make it in 175).

Assuming it's not 175, I'm still kind of surprised you'd find it "squirley" at 34/30 or 35/31.

However I would allow that my impression of Saturn's 30/26 recommendation might have been less negative if I had experienced it with a good touring or performance tire of a 185 instead of low performance 175.
What's coloring this thread is an important lesson- tire choice makes a huge difference in how your car behaves. I have the comparison of our 2 SL2s as a reference. The 97 came with the 185/65R15 Firestone Affinitys. At the time, the whole car was such a total upgrade over the Chevy Spectrum (with its pronounced bump-steer in back) that the Affinity's rubbery steering response when new was not noticed. Then I purchased the 95 used, and went through several sets of the popular Dunlop Sport A2's. I always thought the difference in handling beween the two was due to springs and shock damping. Until the A2's were discountinued by Dunlop (just as well- the last 2 sets (A2 Plus) got ear-ringing LOUD when they wore down), and the closest Dunlop available was the Signature- not a performance tire, but longer lasting. About this time, I finally went researching at Tire Rack, and found the Michelin Pilot Exalto's, 195/60R15, for the 97. Now it's the 97 that handles better. My wife's daily driver, and she is thrilled. All in tire choice.


Those in this family who autocross or road-race will tell you that tire choice can make the difference between being up front or off the back.

Also, there is another thread currently running where the owner has been going back and forth between 14" and 15" wheelsets, and duly noticed the dramatic difference in how the car behaves.

Ultimately, your needs and preferences may be different than ours. Research well...

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Old 01-09-2010, 04:41 PM   #46
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Default Re: Tire Pressures for S Series

Quote:
Originally Posted by Starduster_Sat View Post
Those in this family who autocross or road-race will tell you that tire choice can make the difference between being up front or off the back.

Also, there is another thread currently running where the owner has been going back and forth between 14" and 15" wheelsets, and duly noticed the dramatic difference in how the car behaves.

Ultimately, your needs and preferences may be different than ours. Research well...
yes, tire choice is quite important in autocross. especially with "street" tires. if you're not running one of the 2 or 3 top tires, you're probably not winning unless there's nobody else in your class. wheel size is important, too. if you're running anything bigger than a 15" wheel on your s-series, i will beat you every time. if you're running a 17" wheel (or bigger), it won't even be close. if you can cram a 13" wheel on your car (i've tried without success) and make it work, you have the gearing advantage on your side.

as far as tire pressures; stick with what Eric says. i'm pretty sure there's some saturn engineers that call him up to ask about the s-series saturn. for auto-x racing, you generally run the lowest pressure you can that doesn't let the sidewall touch the ground. after that, you adjust for balance depending on conditions. most of the time you don't have to worry much about over heating the tire...


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Old 01-09-2010, 10:40 PM   #47
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Default Re: Tire Pressures for S Series

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Originally Posted by S3aturnR View Post
as far as tire pressures; stick with what Eric says. i'm pretty sure there's some saturn engineers that call him up to ask about the s-series saturn.

s3aturnr
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Old 11-11-2010, 04:28 PM   #48
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Default Re: Tire Pressures for S Series

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Originally Posted by eRic 02sc2 View Post
30 psi front, 26 psi rear. Saturn came up with that number after testing the OE Firestone tires.
Roads around here are littered with potholes. Would that pressure still work?

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Old 11-11-2010, 09:47 PM   #49
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Default Re: Tire Pressures for S Series

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Originally Posted by isoOctane View Post
Roads around here are littered with potholes. Would that pressure still work?
I believe too much air will break the belts...per my dad, he runs too much air in his SW2 and has broken belts.

For highway, I ran my OE Firehawks at 30/26
My current set of Firehawks seem to do better with a few pounds more air.

Due to my negative camber, too much air makes the car follow ruts too much.
(although, finally setting the alignment and track properly sure helps the driving experience THAT'S FOR SURE!)

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Old 12-24-2018, 04:55 PM   #50
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Default Re: Tire Pressures for S Series

Not sure how much the tire brand matters now days, but I the largest tires stock allows by Jeep and if I go over 26 lbs front 28 lbs rear the ride gets super bumpy and over steers, almost floats the front end.

I use to run similar pressures on the Saturn SL1, but I have been running 32 on all 4 tires for 4-5 years now, as the tires look scary flat-like even at 32. I noticed today the Tire Max pressure rating is huge like 52? (maybe it was 44, I forget) But we never had tires that could go over 32 psi back in the 1970s....

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Old 12-24-2018, 09:55 PM   #51
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Default Re: Tire Pressures for S Series

Original tires were 185/65R15, in "S" speed rating....
35 PSI max...

My current tires are 205/60R15, in "H" speed rating...
51 PSI max...

I put 44 PSI in rear, 37 front, getting around 42 mpg highway...

...
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