LastHopeRS

I was just wondering what some of you 3rd genners are inflating your tires to? I have heard so many different numbers by so many different people...i have cooper cobra 245/50 and i usually inflate to about 32psi (give or take). Is that high, low...or what. i was just curious to see what everyone else fills. Thanks in advance for sharing.

iroc5speed

I inflate to about 43 psi(max is 45). It handles like a dream, the rides a bit bumpy though

breathment

32 front. 30 rear

iroc5speed, why do u inflate to 43?


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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series Muffler added to Unkown CatBack, Ported Intake

http://www.geocities.com/david_angel_16

Ragin'87

35 all around

82camaro

30 front and rear. Proper pressure depends on weight of the car, tire size, tire construction, wheel size, and probably some other stuff. Most 245/50's like around 32psi. More than that and they tend to wear the center out. Max pressure on the side of the tire should be ignored, unless you are hauling something heavy enough to reach the maximum load rating of the tire.

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350 with stealth intake, holley carb, 470 lift cam. 700r4 with .5 boost valve, vette servo, tci lock-up kit, B&M megashifter. Richmond 3.73 gears, powertrax locker, timkin bearings, synthetic lube. Custom 3 inch single into 2 2.5 pipes. 1 1/2 drop springs, 1 5/16 solid front sway bar, 1 inch rear bar, custom subframe connectors, custom LCA relocation brackets. Kobel ground FX, currant red metallic paint. Lots of other stuff...
82camaro

rezinn

32psi all around..

91FireChicken

32 front, 30 rear.. about 20 rear for dragging.

AlexJH

37 fronts / 35 rears for autoxing

Bort62

33 front 31 rear on Kumho Estca V712's 275/40/Zr17's

Im still not getting wear down to the markers Tho, So I imagine 1 or 2 lbs down from that would be best.


Whoever is Running 43 psi is on crack




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85 2.8L Blazer - Soon to to Beater car.
85 Sport Coupe LG4 - Daily Driver 14.55 @ 98.6 (faster than Ed)
Reader's ride -> My Ride

"Faster than Most, Slower than Less"

Inwo

30 all around, softer ride and hooks up better for me, although maybe it's my gearing that helps considering I can't figure out what it is...

RICH92RS350

28 Front/30 Rear
Falcon GRBII 245-45ZR16
Lowered almost 3"
-Rich-

camaro6spd

44lbs

RadarRunner

I run 35 on all 4, & I saw the above post about the sidewall, but I have done that for years on most of my vehicles including motorcycle, & have gotten good wear on most brands of tire.

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1987 Z28 Black & Silver 305 LG4/5-Speed . . .
Dual Snorkel Air Cleaner
4th Gen Seats
NRA/AMA/FOP/IUPA/Blue Knights

iroc5speed

cauise that's what the max said(well, 2 lbs less) so I did it. I later heard it's supposed o be in the 30's recommended, but I
m too lazy to take air out, and personally I love the handling

SSC

35 usualy but I prefer to be +5 PSI to reduce tire wear.
SSC

99Hawk120

32 cold, which becomes about 35 hot...

fly89gta

iTrader: (1)

same here, my firehawk SVX's say 45#'s on the rear that is

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*89 Trans Am GTA
*Moderator at www.transamgta.com

To hell with the GM vs Ford war. We must unite, as brothers to fight the plague that is overtaking the world...RICE

Tony

Tom84L69

front 30 rear 26.
I have cheapo 235/60/15 fronts and 255/60/15 rears. The rears show too much wear in the middle so i run 26 psi. Those numbers above in the 40s are too high.

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84 Z28 L69. 5 speed with 3.73 posi (broken)Ported heads, intake, 10:1 comp. 230/230 .480 lift cam @.050" w/108 LSA

Triumph Spitfire SCCA roadracer. 1.1 liter 4cyl w/ 14:1 comp.
turns on rails!

burntblues

State troopers inflate to 42# in Mass. I inflate mine just above that so I can get a little ahead if I have to. If i'm drag racing I leave my front alone and drop the rear to about 20#

-=-Mike

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1989 RS.. 355, Hypereutectic pistons, double roller cam, double roller timing chain, accel wires, blue streak cap and rotor, rapidfire plugs, chevy caprice 350 chip, 200* fan switch, 3 angle valve job, 3 inch cat-back exhaust, 3 core radiator, 3.73 gearing with POSI.

Bort62

If your Running that much pressure, unless you have a really heavy car, wich you don't, Your not getting a full contact patch.


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85 2.8L Blazer - Soon to to Beater car.
85 Sport Coupe LG4 - Daily Driver 14.55 @ 98.6 (faster than Ed)
Reader's ride -> My Ride

"Faster than Most, Slower than Less"

82camaro

Read closely what the sidewall says. Max pressure at "xxxx" weight. Or something to that effect. If you max out the load rating on the tire, then run the maximum pressure. The maximum pressure is exactly that--the maximum pressure the tire can handle. The pressure on the door jamb will be much closer to optimum.

From the tirerack.com
Maximum Inflation Pressure

A tire's maximum inflation pressure is the highest "cold" inflation pressure that the tire is designed to contain. However the tire's maximum inflation pressure should only be used when called for on the vehicle's tire placard or in the vehicle's owners manual. It is also important to remember that the vehicle's recommended tire inflation pressure is always to be measured and set when the tire is "cold". Cold conditions are defined as early in the morning before the day's ambient temperature, sun's radiant heat or the heat generated while driving have caused the tire pressure to temporarily increase.

For the reasons indicated above, It is also normal to experience "hot" tire pressures that are up to 5 to 6 psi above the tire's recommended "cold" pressure during the day if the vehicle is parked in the sun or has been extensively driven. Therefore, if the vehicle's recommended "cold" inflation pressures correspond with the tire's maximum inflation pressure, it will often appear that too much tire pressure is present. However, this extra "hot" tire pressure is temporary and should NOT be bled off to return the tire pressure to within the maximum inflation pressure value branded on the tire. If the "cold" tire pressure was correctly set initially, the temporary "hot" tire pressure will have returned to the tire's maximum inflation pressure when next measured in "cold" conditions.

A tire's "maximum inflation pressure" may be different that the assigned tire pressure used to rate the tire's "maximum load". For example, while a P-metric sized standard load tire's maximum load is rated at 35 psi, many P-metric sized standard load performance and touring tires are designed to contain up to 44 psi (and are branded on their sidewalls accordingly). This additional range of inflation pressure (in this case, between 36 and 44 psi) has been provided to accommodate any unique handling, high speed and/or rolling resistance requirements determined by the tire and vehicle manufacturers. These unique tire pressures will be identified on the vehicle placard in the vehicle's owner's manual.

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350 with stealth intake, holley carb, 470 lift cam. 700r4 with .5 boost valve, vette servo, tci lock-up kit, B&M megashifter. Richmond 3.73 gears, powertrax locker, timkin bearings, synthetic lube. Custom 3 inch single into 2 2.5 pipes. 1 1/2 drop springs, 1 5/16 solid front sway bar, 1 inch rear bar, custom subframe connectors, custom LCA relocation brackets. Kobel ground FX, currant red metallic paint. Lots of other stuff...
82camaro


[This message has been edited by 82camaro (edited December 07, 2001).]

skipsZ28

You can get better milage with the tires set to the max psi. I've noticed a difference on my 2000 cavalier (z24) when I set the tires to 42 from 30 psi. The harder the tire is, the easier it will spin. on my z28 i run the tires at 32.

Grim Reaper

Yes. Increased tire pressure does yield better gas mileage. I believe you should adjust your tire pressure to suit your driving needs.

On a long highway trip, I will purposely increase the tire pressure to 40 psi to get better gas mileage. In typical city driving, I run 32 psi. For dragging, I run 40 psi front and low 20 rear.

Takes only a few minutes to adjust the air pressure, which I like to check on a regular basis, even if my "style" of driving hasn't changed in awhile.

Grim Reaper

PS: Same with changing your oil. You should adjust your intervals based on the type of driving you've been doing. If you've been doing a lot of "stop-n-go" or other "severe" duty, you should change it even more frequently than 3,000 miles/5,000 Km.

breathment

well the gas money you save overinflating ur tires will be negated by the cost of new tires or a new car..

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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series Muffler added to Unkown CatBack, Ported Intake

http://www.geocities.com/david_angel_16

Grim Reaper

Over the 10 years and 200,000 miles I've put on my car since I've boought it new in 1991, I've also get great mileage (and proper wear) out my tires (except if I've been booting it a lot from standing starts).

No accidents either. I also live in a very mountainous area - there is nothing flat or straight here for any distance.

[This message has been edited by Glenn91L98GTA (edited December 07, 2001).]

Sitting Bull

I find I get the best handling, performance and ride with 28 pounds both front and rear. And I have very, very good tires. Goodyear P225-60R15 Eagle HPs, good to 200 kph.