Need help with putting the correct tire pressure

[talontsiboy24]

Ok so my 1g door lable says 32psi front and 29psi rear but thats on stock wheels which are 16" i believe...Well i have 17" wheels now and the tire size is 225/45-17 so should i put 32psi in all four tires?

I dont want bad gas mileage or my rims to bend either also want the pressure to be good for handling and performance.

 

[19Eclipse90]

Those numbers are vehicle/location specific (front or rear), not tire specific.

32 psi in a 205-55-16 is a different volume of air than 32 psi in a 225-45-17. But 32 psi is still 32 psi, which is what the specifications call for and will give you ample performance and handling.

However, if you want to try improving gas mileage by increasing pressure, it is recommended to increase the pressure to at least 38 psi to decrease rolling resistance (source: http://www.dsmtuners.com/forums/articles-miscellaneous/254223-how-save-gas.html. Before you do, make sure your tire's pressure ratings can handle it.

There's always a trade off, less pressure will yield better performance and handling (to a point) and more pressure will yield better fuel mileage. Choose what works for you.

 

[steve]

Also remember that inflation pressure effects tire wear so watch how they wear over time if the center wears faster you have too much pressure, both outer edges too little, one edge faster that the rest an alignment issue.

 

[talontsiboy24]

Those numbers are vehicle/location specific (front or rear), not tire specific.

32 psi in a 205-55-16 is less air than 32 psi in a 225-45-17 only because more air is required to increase the pressure in the larger volume of the larger tire. But 32 psi is still 32 psi, which is what the specifications call for and will give you ample performance and handling.

However, if you want to try improving gas mileage by increasing pressure, it is recommended to increase the pressure to at least 38 psi to decrease rolling resistance (source: http://www.dsmtuners.com/forums/articles-miscellaneous/254223-how-save-gas.html. Before you do, make sure your tire's pressure ratings can handle it.

There's always a trade off, less pressure will yield better performance and handling (to a point) and more pressure will yield better fuel mileage. Choose what works for you.

My car door label says 32front 29rear but thats what stock calls for with 16" wheels right? but i now have 17" rims and tire size is 225/45-17...its winter out here so i was thinkin to run 32 or 34psi in all four? They say not to run higher then stock pressure in winter and lower pressure makes better contact with the ground?

But im saying the door lable says 32psi in front i guess cause the car is heavier in front then the rear? So i should probably put 34psi in front and like 32psi in the rear since im on 17" rims which are heavier then the stock 16s?

By the way my car wont be driven when snow is on the ground only on those dry winter road days but our temps are in the 20s,teens,and single digits out here.

 

[19Eclipse90]

My car door label says 32front 29rear but thats what stock calls for with 16" wheels right?

For all practical purposes (i.e. all common passenger tires), the manufacturer (Mitsubishi) recommends 32psi in the front and 29psi in the rear for your vehicle for adequate performance/handling, comfort, and fuel economy. Tire/wheel size is basically a non-factor in this.

but i now have 17" rims and tire size is 225/45-17...its winter out here so i was thinkin to run 32 or 34psi in all four? They say not to run higher then stock pressure in winter and lower pressure makes better contact with the ground?

From summer to winter, tire pressure will decrease due to temperature. It's a good idea for everyone to check their tire pressure when the cold weather comes around. When the temperatures rise, the pressure in your tires increases so everyone should check their pressures at that time as well. You can run 32 or 34psi in all four without any problems, barring any weird wear patterns like steve mentioned.
If you will be driving through snow (which I see you are not, but for those who are), it is better to have higher pressure in the tires. A skinny tire is preferred over a wide tire as it can cut through the snow to the road where a wide tire tends to "float" over the snow. Increasing the tire pressure increases sidewall rigidity, making your tire slightly skinnier.

But im saying the door lable says 32psi in front i guess cause the car is heavier in front then the rear? So i should probably put 34psi in front and like 32psi in the rear since im on 17" rims which are heavier then the stock 16s?

Again, the type or size of tire and wheel does not make any difference. For example, any FWD 1G is recommended to run 29psi in the front and 26psi in the rear according to the FSM. Those vehicles with the 1.8L came with 14"x5.5" wheels and 185/70/14 tires. Those with the 2.0L (non-turbo and turbo) came with 16"x6" wheels and 205/55/16 tires. All of those cars are recommended 29psi in the front and 26psi in the rear by Mitsubishi. No doubt the 14"x5.5" with tire weighs less than the 16"x6", by they are still recommended the same pressures.
Yes, the difference in front and rear pressures is due to weight -- vehicle weight. That doesn't mean you pressure for adding weight in the wheel itself. You would be fine running 34psi in the front and 32psi in the rear, 34psi or 32psi all around, or the recommended 32psi and 29psi. As stated in the link I provided last time, higher pressures will make the ride less comfortable, so how high you want to go is up to you.

Hope that helps you out!


Edit: I see you already received a lot of help from members in this thread. Hopefully between the two you've got things figured out.