: Tire Pressure?


06GTO6.0
10-28-2005, 03:04 PM
What tire pressure do you guys run in your GTO? The owners manual states 30psi for(17" wheels)...is this optimal? I have always ran 35....but this morning, after reading more of the manual last night I decided to decrease to 30....can't really tell much of a difference though. Any thoughts?....Thx...:cool:

-db-
10-28-2005, 04:19 PM
I'm almost certain the door panel on the car says 35 and that's where I keep mine. Well, actually I run 34 in back and 36 up front.

daveinsa
10-28-2005, 05:13 PM
I'm almost certain the door panel on the car says 35 and that's where I keep mine. Well, actually I run 34 in back and 36 up front.

I take the engine weight into consideration too. I run 32 in the back and 35 up front

Kruul
10-28-2005, 05:42 PM
35/35 on the street. Fronts are stock and rears are Nitto's but I did the same with all stock.

Redfred
10-28-2005, 05:54 PM
40 all around for daily. i have a curvy ride to work feels little better then 35. i drop back to 35 for long drives more comfy on the interstate. local track likes the mid pressures as well. stock all around btw.

400Plus
10-29-2005, 04:30 AM
For stocker 18's the book says: 33 Front / 39 Rear.

Sounds backwards but thats what they reccomend.

old goat 05
10-29-2005, 05:35 AM
i go with 40 all round . i go by tire mainufacture then nock down a little bit .dont go by car mainufacture . look what happen to ford(ya i know bad word). i worked at ford for a little bit and they wanted 26 front 28 rear and look what happened ford blamed tire main ,tire main blamed ford.

trm100
10-29-2005, 05:53 AM
i go with 40 all round . i go by tire mainufacture then nock down a little bit .dont go by car mainufacture . look what happen to ford(ya i know bad word). i worked at ford for a little bit and they wanted 26 front 28 rear and look what happened ford blamed tire main ,tire main blamed ford.

**Note that the following is for daily driving, not track runs....**

The rule of thumb I was taught is the following:

OEM tires- use DOOR STICKER recommendations
supposedly GM (or whoever) has done research and found this
pressure to be the best for performance and/or mileage based
on THESE PARTICULAR tires.

Non-OEM tires- use pressure rating ON TIRE +/-5% to your liking based
on how you feel the ride, etc...

ROKS ROKET
10-29-2005, 06:11 AM
I found 34psi all around works best for me since I don't drive the car on a daily basis. At the track, I'll raise the fronts to 40 and lower the rear Nittos to 17 psi. it changes the whole profile of the car, and the Nittos wrinkle as they grab for a great launch.

~ROK~

H2OSGTO
10-29-2005, 06:25 AM
35psi on all 4

old goat 05
10-29-2005, 07:02 AM
**Note that the following is for daily driving, not track runs....**

The rule of thumb I was taught is the following:

OEM tires- use DOOR STICKER recommendations
supposedly GM (or whoever) has done research and found this
pressure to be the best for performance and/or mileage based
on THESE PARTICULAR tires.

Non-OEM tires- use pressure rating ON TIRE +/-5% to your liking based
on how you feel the ride, etc...
i do not want this to get into a debate thing but with ford it was mainly there fault why they had tire problems. ive seen brand new f150, rangers with not even 3k miles on with cupped tires or some kind of tire problem due to shock or front end prob or just low tire psi,now if they did there research u wound not see this problem. now gm i never seen this prob. now this is something ive seen and delt with. now me ingeneral i put 40psi in for around town and gas miles. racing then i run 35psi per say for tracion. so i hope this does not get into a big debate .

Devil
10-29-2005, 08:36 AM
I've always kept it at 32, seems to be the safe zone for me at least.

Redfred
10-29-2005, 09:11 AM
manufacturer sets pressure at whats comfy to most drivers not allways whats safest or best performance. the stock tires roll over ad play dead road corse under 40psi.

the tire thing was a both company screw up. the firestones had a defect that was ok at 35 or higher psi, ford set pressures at under 30 because it made the explorer ride nice and soft. and everything went poof.

noob
10-30-2005, 06:05 PM
35 psi, so sayeth the manual. But they did come with 55-60 in them.

jmasse
10-30-2005, 06:21 PM
To reply to some other replys in this post, there is no such thing as a tires' recommended pressure. The pressure stated on the side of ANY passenger tire is the maximum safe pressure and is in no way related to what you should set the pressure at for driving. It is there so the tire is not overinflated and cause tire damage. You should use the placard on the car and make minor adjustment based on your personal preferences, but DO NOT set the pressure at 44 psi unless you want your car to ride like a broken log wagon and have very little straight line traction.

Jeff

DawgByte
10-31-2005, 01:24 PM
35/35 now.

I've played with it at 39/39 and 32/32. It runs best where I have it now.

xxxxxxxxSilver Ecstasy
03-19-2006, 10:22 PM
I have an 05, however I had bargained to have the dealer install the stock set of 18's on the vehicle. I haven't received my owner's manual yet (the dealer is supposed to send it to me) but what is a typical normal temp to run with the 18's? I read what someone wrote about them, but I wasn't sure cause the poster seemed a little hesitant.

why2kmax
03-20-2006, 05:59 AM
35/35 checked when dead cold

GTO DIVA!
03-20-2006, 06:10 AM
32/32 checked on Saturday

Holeshot
03-20-2006, 06:40 AM
Mine are filled with Nitrogen so I run 30 psi:wall:

Flashpoint
03-20-2006, 08:11 AM
35 psi, so sayeth the manual. But they did come with 55-60 in them.


yeah but they came with 55-60 PSI so they didn't flat spot on the boat/train/truck ride over here. It is suppose to be reduced durring the PDI....if the person doing said PDI actually read the thing....:banghead:

HotRodGuy
03-20-2006, 08:33 AM
33 all around dead cold on factory 18's

fremont gto
03-20-2006, 07:25 PM
I thought I would go on to the dealer service manual for th 2005 GTO and see what they say for tire pressure. I found it interesting that they have a high speed tire pressure for speeds over 100 MPH. I dont think they will cover any damage to tires or not if you are driving at 100MPH or faster though.

Document ID# 1507133
2005 Pontiac GTO


--------------------------------------------------------------------------------

Inflation - Tire Pressure
Tires need the correct amount of air pressure to operate effectively.

Notice: Do not let anyone tell you that under-inflation or over-inflation is all right. It is not. If your tires do not have enough air (under-inflation), you can get the following:

• Too much flexing

• Too much heat

• Tire overloading

• Premature or irregular wear

• Poor handling

• Reduced fuel economy

If your tires have too much air (over-inflation), you can get the following:
• Unusual wear

• Poor handling

• Rough ride

• Needless damage from road hazards


A Tire and Loading Information label is attached to your vehicle's center pillar, below the driver's door latch. This label lists your vehicle's original equipment tires and their recommended cold tire inflation pressures. The recommended cold tire inflation pressure, shown on the label, is the minimum amount of air pressure needed to support your vehicle's maximum load carrying capacity. For more information regarding how much weight your vehicle can carry, see Loading Your Vehicle .

How you load your vehicle affects vehicle handling and ride comfort. When driving with less than the maximum load capacity allowed for your vehicle, you can set tire inflation pressure to the recommended amounts shown in the following chart. Never load your vehicle with more weight than it was designed to carry.

Tire Size
Recommended Cold Tire Inflation

Occupant and Cargo Weight:

470 lbs (210 kg) or Less
Occupant and Cargo Weight:

Up to 740 lbs (330 kg)

(Vehicle Capacity Weight)

Front Tires
Rear Tires
Front Tires
Rear Tires

245/45ZR17 95W
30 psi (210 kPa) front 470lbs
30 psi (210 kPa) rear 470lbs
35 psi (240 kPa) front 740lbs
35 psi (240 kPa) rear 740lbs

235/40ZR18 91W
33 psi (230 kPa) front 470lbs
33 psi (230 kPa) rear 470lbs
33 psi (230 kPa) front 740lbs
39 psi (270 kPa) rear 740lbs

T145/70R17 96M

(Compact Spare)
60 psi (420 kPa)
60 psi (420 kPa)
60 psi (420 kPa)
60 psi (420 kPa)


When to Check
Check your tires once a month or more.

Do not forget your compact spare tire. It should be at 60 psi (420 kPa). For more information about your vehicle's compact spare tire, see Compact Spare Tire .

How to Check
Use a good quality pocket-type gage to check tire pressure. You can't tell if your tires are properly inflated simply by looking at them. Radial tires may look properly inflated even when they're underinflated. Check the tire's inflation pressure when the tires are cold. Cold means your vehicle has been sitting for at least three hours or driven no more than 1 mile (1.6 km).


Remove the valve cap from the tire valve stem. Press the tire gage firmly onto the valve to get a pressure measurement. If the cold tire inflation pressure matches the recommended pressure on the Tire and Loading Information label, no further adjustment is necessary. If the inflation pressure is low, add air until you reach the recommended amount.

If you overfill the tire, release air by pushing on the metal stem in the center of the tire valve. Recheck the tire pressure with the tire gage.

Be sure to put the valve caps back on the valve stems. They help prevent leaks by keeping out dirt and moisture.


High Speed Operation
Caution: Driving at high speeds, 100 mph (160 km/h) or higher, puts an additional strain on tires. Sustained high-speed driving causes excessive heat build up and can cause sudden tire failure. You could have a crash and you or others could be killed. Some high-speed rated tires require inflation pressure adjustment for high speed operation. When speed limits and road conditions are such that a vehicle can be driven at high speeds, make sure the tires are rated for high speed operation, in excellent condition, and set to the correct cold tire inflation pressure for the vehicle load.

Vehicles equipped with 245/45ZR17 95W size tires, do not require additional air pressure for high-speed operation. If your vehicle has 235/40ZR18 91W size tires, use the following chart to determine the cold tire inflation pressure when operating your vehicle under high-speed conditions.

Tire Size: 235/40ZR18 91W

Recommended Cold Tire Inflation Pressure for High Speed Operation

Occupant and Cargo Weight:

470 lbs (210 kg) or less
Occupant and Cargo Weight :

Up to 740 lbs (330 kg)

(Vehicle Capacity Weight)

Front Tires
Rear Tires
Front Tires
Rear Tires

36 psi (250 kPa) front 470lbs
36 psi (250 kPa) rear 470lbs
39 psi (270 kPa) front 740lbs
44 psi (300 kPa) rear 740lbs


When you end high-speed driving, return the tires to the cold inflation pressure shown on the tire and loading information label.


--------------------------------------------------------------------------------
Document ID# 1507133
2005 Pontiac GTO

ATL_GTO
12-23-2006, 06:22 PM
Thanks for the post! Very helpful!

dredz172
12-25-2006, 12:51 PM
well with temperature being a factor.... i put them at 32 cold, and then at rest plazas on high way, i try to make sure they stay between 36 and 38 hot

D-GTO
12-25-2006, 02:02 PM
I run mine 44 all around all the time except at the track when I run the rears @ 20 to 22

06black6spd
12-25-2006, 02:22 PM
35 for the front and 28 in the rear. Rear has nitto's 555'r

GTO 1
12-25-2006, 09:23 PM
Two different pressure specs depending on weight carried, for 17's. I follow the recommeded pressure with a stock (suspension) vehicle as in Owners Manual.

RDGGTO
12-26-2006, 03:52 PM
33 all around on my stock 18's.