Seems like everytime I get enw tires the shops always fill them only to 30 PSI. WHY??? They don't even look full. I've kept the last set between 38-43.

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http://www.cardomain.com/ride/3882088

I run 35-36 psi so the tires don't wear on the outside edges. Too much pressure will cause the center of the tread area to wear prematurely.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
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I keep mine at 40psi, less rolling resistance, and better fuel economy.

Milestone

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I run 30 because thats what the door sticker says.....

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All sho no go...

The TPS warning pops up at 32psi on my car so I need to keep it a little higher for temperature variation.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

35 that is waht the door sticker says for cold range after it warms up (20 minutes driving) it reads 42psi

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

32-35 is what i use on mine.

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1999 GT|SLP CAI|Borla Catback| Shift kit|18" Koblenz|GMPP Lowering|GMPP handling|Blk Headlights|ER Rcokers|HV3|HV TB http://www.fquick.com/The_Guz

Same here, 32-35 and rotate them.

35 up front, 40 in back.

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38-40 on the summer tires and 32-34 on the winters...ive had no problem with premature wear on my summers yet, and ive got 15k and 3 summers worth of driving on em

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04 GP GT1 black spo grilles/spoiler, tinted led tails/third brake light, painted reverse bar, 6k lows/fogs, gxp door rings, STB's/DR brackets, DR door locks, GMPP RTA's, Wizair

wondering why more in the rears than fronts .. the front has more weight to it. (unless huge system)

i will often run up about 40-42 sometimes less (usually because the temps will lower them) in the winter (allthough i do check them every so often) apparently i drive just hard enough to wear the sholders as our tires usually have pretty even wear on them

my general rule is close to what the tire says for max cold (a little less to not wear the centers too much), my exception to this is with my truck, as it has load E tires which require 80 psi for max, and i run about 50 psi most of the time unless i am gonna pull a large load farther than about 30-50 miles. (like over 7,000 lbs) but as being i have 6 tires on the ground having them that hard with no load and only tonge wieght from hauling a car (5-6,000 usually with car and trailer) there is no need for that much. 4 tires @ 50 psi is plenty (and still wearing centers)

our other eception in trailer tires, max psi allways. (haveing a trailer tire blow to underinflation is just stoopid) they wear the centers really bad, but we have very, very few fail.

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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

35 on stock wheels.

I'm not sure about my 18" wheels with 245/45/18 tires. I guess same 35?

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38-40 PSI.

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2009 Pontiac G8 GT- Roto-Fab Intake, Roto-Fab Radiator cover, Superchips Cortex Tune, Tinted Tail lights, Corsa Cat-Back Exhaust, Tinted side markers, Painted GXP Diffuser, Tinted Reflectors, Painted Grilles.

it loosens the car up a little.

34 fronts and 36 rears for my 2 gps.

I don't see why would you want to loosen the car up. I want mine to handle tight since the G8 has a 50/50 weight balance so I keep all 4 tires the same pressure.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

35 on all

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3.5" MPS, 1.84 Rockers, 3" DP, Frt PEM, 39lb Injs., PowrTuner, Wizair
14.07@ 98.85mph 2.180 60'

4.43 psi in the rear, 73.22 psi in the front

/\ That's messed up!

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

In the GP I ran 32 all around. That provided me with even wear. When I got them the shop put 35 in them and the outer edges weren't wearing at all. 32 evened everything out.

In the Jeep I run 28 all around. Big balloony 33's need less air on a 3800lbs Jeep. Again when I got them installed the shop put 35 in them and the outer 1.5 inches of tread weren't even touching the ground. 28 evened everything out. With 35 I was bouncing all over the place going down the road. 28 smoothed that out too.

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Higher pressure in the back because of a lot of weight in the back and my car's tendency to plow like a mofo.

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Since 70% of the weight of the GXP is in the front I should keep those higher?

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http://www.cardomain.com/ride/3882088

I always put more pressure in the front tires when I drove a Grand Prix since the front is heavier.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

X2 mine like it get pissed off at me. Thank god I have an air compressor.

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Why have more money than brains? Cuz RACE CAR :

Mine went off yesterday and it's not that cold yet. I put 36 lbs (cold) in them and when I left home this morning they were all at 34. WTF?

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

I don't think they read correctly at all. I compared the DIC and the results from the air pressure gauge I got and it was different.

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Why have more money than brains? Cuz RACE CAR :