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Old 09-14-2011, 04:26 PM   #1
glockoma
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Tire Pressure

Long time lurker, first time poster. I just received my 5-door and was curious what psi others are running in their tires? The Continentals that came with the 17" polished alloys indicate a max of 51psi - currently set at 40psi.

Two-thirds of my commute is highway and I have been averaging ~38mpg although I did manage to squeeze out 51mpg (no stops, 40-50mph for approx. 15 minutes).




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Old 09-14-2011, 04:33 PM   #2
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Quote:
Originally Posted by glockoma View Post
Long time lurker, first time poster. I just received my 5-door and was curious what psi others are running in their tires? The Continentals that came with the 17" polished alloys indicate a max of 51psi - currently set at 40psi.
You should use the recommended tire pressure (35 PSI) as a guideline.

I usually set the tire pressures to 2~3 PSI greater than the recommended pressure.
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Old 09-14-2011, 04:38 PM   #3
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A good place to start is what ever the sticker on the door jam recommends. The tire rating is the safe maximum pressure the tire can handle.
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Old 09-14-2011, 04:40 PM   #4
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I have the 18" summer tires which recommend 39psi. I was wondering if it would be dangerous to drive with about 5psi more than this? Do you think there would be a noticeable difference in gas mileage - especially at lower speeds?
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Old 09-14-2011, 04:42 PM   #5
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to ff.com

as stated above 35 psi is normal

the reading on the sidewall of the tire is the max the tire can handle, however this is set by the manufacture of the tire. The 35psi that ford stated for the car, which gives you the proper footprint where the tire meets the road, this insures proper traction, tire wear, and fuel economy, always set tires at what the car manufacture says, Never set your tires at the max rating on the sidewall.
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Old 09-14-2011, 04:55 PM   #6
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The 35psi that ford stated for the car, which gives you the proper footprint where the tire meets the road, this insures proper traction, tire wear, and fuel economy, always set tires at what the car manufacture says, Never set your tires at the max rating on the sidewall.
But...but... hypermiling and such? (I've never tried, but I'm tempted to)
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Old 09-14-2011, 05:01 PM   #7
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I have found having the front tires at 5 to 8 PSI higher than the rear gives the actual equal tire footprint.
The front of a front engine car IS HEAVIER, and thus the tires, to actually have the same footprint oval, fronts have to have higher pressure than the rear.
Also with too much pressure in the rear tires, the ride gets really choppy.

So if you are trying to save gas with higher pressure in the tires...
If the recommended all around is 35, go 37 rear, 42 front. Even 43 front
(A V-6 i would go 8 pounds heavier front than rear, with a small four banger, like the Focus, four to six pounds more air front is great.)
If you want a good ride, then stick to 36 instead of 35 rear, and 40 or 41 front.
I am using 41 front, 36 rear and the ride over concrete is MUCH better than 38 all around.
I may go up to 43 front and 36 rear just to try it out. (When the front steering is very 'light' then your front tires are too high a PSI)
IMO the 'even' all around tire pressure is for simple folk not to get confused.
(Feel free to dis' me for that comment, no problem, I stick by the reality of actually measuring the contact oval and IF YOU DO, the front PSI will be higher to aquire a similar oval contact patch (the golden ring of tire pressure, read up on it...), as I said, by anywhere from 4 to 8 pounds.. in a front engine car. ALWAYS
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Old 09-14-2011, 05:09 PM   #8
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Quote:
Originally Posted by Elizabeth View Post
I have found having the front tires at 5 to 8 PSI higher than the rear gives the actual equal tire footprint... Feel free to dis' me for that comment, no problem, I stick by the reality of actually measuring the contact oval and IF YOU DO, the front PSI will be higher to aquire a similar oval contact patch...
Wow - I took a automotive design class last semester and for all of the "contact patch" talk we went over, we never talked about higher pressure in the front tires. But it makes sense to me!
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Old 09-14-2011, 06:25 PM   #9
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Quote:
Originally Posted by PratoN View Post
But...but... hypermiling and such? (I've never tried, but I'm tempted to)
true, hypermiling is a different story, in order to do hypermiling you will need to set your tires higher to get the best results. While I will admit a higher set psi will get you better mileage, there are many more factors in how you drive in order to get the same result of higher mpg's. But consider this the higher pressure puts more wear on the middle of the tire, resulting in premature wear. also with less rubber on the road less traction, while this isn't an issue with dry roads, when it rains you have a much higher chance of hydroplaning than if you had your tires set at the recommended setting due to the size of the foot print.

Quote:
Originally Posted by Elizabeth View Post
I have found having the front tires at 5 to 8 PSI higher than the rear gives the actual equal tire footprint.
The front of a front engine car IS HEAVIER, and thus the tires, to actually have the same footprint oval, fronts have to have higher pressure than the rear.
Also with too much pressure in the rear tires, the ride gets really choppy.

So if you are trying to save gas with higher pressure in the tires...
If the recommended all around is 35, go 37 rear, 42 front. Even 43 front
(A V-6 i would go 8 pounds heavier front than rear, with a small four banger, like the Focus, four to six pounds more air front is great.)
If you want a good ride, then stick to 36 instead of 35 rear, and 40 or 41 front.
I am using 41 front, 36 rear and the ride over concrete is MUCH better than 38 all around.
I may go up to 43 front and 36 rear just to try it out. (When the front steering is very 'light' then your front tires are too high a PSI)
IMO the 'even' all around tire pressure is for simple folk not to get confused.
(Feel free to dis' me for that comment, no problem, I stick by the reality of actually measuring the contact oval and IF YOU DO, the front PSI will be higher to aquire a similar oval contact patch (the golden ring of tire pressure, read up on it...), as I said, by anywhere from 4 to 8 pounds.. in a front engine car. ALWAYS
.
You make a very valid argument here. and while I do agree with most of what you have said, and it is true that a higher will result in a better ride typically, but once again your making a smaller footprint with the road. Yes there is more weight up front, and yes it has a larger foot print due to the weight, but going again back to traction, since the car is front wheel drive you will get more traction, and the majority of the breaking is done with the front breaks as well. So with a higher pressure up front making the foot print smaller, it could affect traction negatively, and increase breaking distances.
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Old 09-14-2011, 10:12 PM   #10
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Keep in mind the recommended pressure is with the tires cold. Driving the car with the tires flexing raises the temperature and increases the pressure. In hot weather the tire pressure can go much higher than the recommended pressure. Also, if the tires are too hard (over inflated) they are prone to damage from rough roads, curb and junk on the street.
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