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Post by papcina on Oct 17, 2010 12:03:22 GMT -5
hi can you please tell me what is the tire pressure, front and rear, for the justy 1.2 gl 1994 4wd previous owner had them at around 1.7bar, i've put them at 2bar... i've seen here it's supposed to be 44psi (3bar) but imho i think that's a lot... or not? please advise thx ps- got this winter tires on each wheel www.ityre.com/en/tyres/catalog/sava/model/2638/
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SeattleJusty
No, a boxer will not fit in a Justy.
Posts: 1,587
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Post by SeattleJusty on Oct 17, 2010 15:34:40 GMT -5
hi can you please tell me what is the tire pressure, front and rear, for the justy 1.2 gl 1994 4wd previous owner had them at around 1.7bar, i've put them at 2bar... i've seen here it's supposed to be 44psi (3bar) but imho i think that's a lot... or not? please advise thx ps- got this winter tires on each wheel www.ityre.com/en/tyres/catalog/sava/model/2638/ On the sidewall of your tire it will say the maximum allowable tire pressure in both imperial and metric.
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Post by papcina on Oct 17, 2010 16:10:01 GMT -5
okay, but what about the stock tire pressure? i heard here on forum that the stock pressure should be 3bar (44psi) is that correct or not?
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Post by nsquared97 on Oct 17, 2010 22:32:55 GMT -5
That doesn't sound right, I believe it says 27 psi on the door of my 89.
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Post by papcina on Oct 18, 2010 0:29:10 GMT -5
That doesn't sound right, I believe it says 27 psi on the door of my 89. can someone confirm that? i have no stickers on the doors of my 94 :/
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nsj93
Justy 1.2 GL II 4WD
Posts: 14
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Post by nsj93 on Oct 18, 2010 13:56:07 GMT -5
The default tire pressure is 2.1 bar (30 PSI), front and rear, according to my instruction manual. My car is a 92/93 Justy 4WD.
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SeattleJusty
No, a boxer will not fit in a Justy.
Posts: 1,587
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Post by SeattleJusty on Oct 18, 2010 16:10:41 GMT -5
The default tire pressure is 2.1 bar (30 PSI), front and rear, according to my instruction manual. My car is a 92/93 Justy 4WD. That information is only useful if you have the exact specification original tires. Tire technology has progressed a lot on the last 20 years and the tires you have now may be designed to run with much higher pressures. Always always always look at the sidewall of your tire and read the recommended pressures. You might need more like 44PSI depending on what tires you currently have.
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nsj93
Justy 1.2 GL II 4WD
Posts: 14
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Post by nsj93 on Oct 18, 2010 17:06:48 GMT -5
The default tire pressure is 2.1 bar (30 PSI), front and rear, according to my instruction manual. My car is a 92/93 Justy 4WD. That information is only useful if you have the exact specification original tires. Tire technology has progressed a lot on the last 20 years and the tires you have now may be designed to run with much higher pressures. Always always always look at the sidewall of your tire and read the recommended pressures. You might need more like 44PSI depending on what tires you currently have. The sidewall of my tire only includes a maximum pressure. How can a tire have a recommended pressure without knowing at least the weight of the vehicle? That said, I use 2.5 bar on my tires, but my previous post was directed at papcina, who wanted to know the default tire pressure.
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Post by RedRooJusty on Oct 18, 2010 22:49:38 GMT -5
That information is only useful if you have the exact specification original tires. Tire technology has progressed a lot on the last 20 years and the tires you have now may be designed to run with much higher pressures. Always always always look at the sidewall of your tire and read the recommended pressures. You might need more like 44PSI depending on what tires you currently have. The sidewall of my tire only includes a maximum pressure. How can a tire have a recommended pressure without knowing at least the weight of the vehicle? That said, I use 2.5 bar on my tires, but my previous post was directed at papcina, who wanted to know the default tire pressure. **nsj93**, **seattlejusty** is absolutely correct, please have the patience to accept good advise. The weight of my 1990 4WD is ~2000lbs. Simple math: -- the 1 car = 2000lbs has 4 tires, since the tag on your car has the exact same pressure for front and rear, let that be a 1:1 weight ratio by Subaru's design or roughly 500lbs per tire. Now take 1 tire: -- the tire is rated for Maximum pressure at a given load (also printed on the sidewall of the tire). My tires are rated like this exactly "MAXLOAD 470kg (1036 LBS) AT 300kPa ( 44PSI ) MAX.PRESS" Each tire is rated to hold a max load of 470kg at 300kPa, my car distributes roughly 230kg of load per tire, and the tire is rated for double that load. What does this mean? 1. Fill your tires with the load of the vehicle applied to them. 2. Do not exceed the maximum pressure given by the tire vendor. 3. Do not exceed the maximum load given by the tire vendor What's implied by the tire vendor? You can run you tires to any pressure below the maximum, just do not exceed it. What does the Subaru door card mean? Exactly what **seattlejusty** said, it refers to the OEM tire that shipped from the factory with the vehicle. The important tid-bit from the door plate is the pressure ratio given front:rear. Hypothetically, if the OEM ratio was 40psi (front) : 30psi (rear), then I would translate this to mean 44psi (front) : 33psi (rear) for my 44psi tire (and I do not exceed the max load).-RRJ
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Post by papcina on Oct 19, 2010 3:59:40 GMT -5
thx all of you, this issue has been cleared for me my tire max pressure is 3bar (44psi) but at 2bar they seem like they have enough pressure in them and i'm afraid to put more air in them cos they might explode ;D will keep them at 2bar than... btw, when going offroad (mud and snow) what would be suggested tire press, around 1.6bar right?
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nsj93
Justy 1.2 GL II 4WD
Posts: 14
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Post by nsj93 on Oct 19, 2010 6:06:51 GMT -5
Quote from National Highway Traffic Safety Administration (NHTSA): "Remember, however, that the vehicle manufacturer, not the tire manufacturer, determines the correct tire pressure for the tires on your vehicle." Why does NHTSA give this advice? Lack of patience? Recommended tire pressure is dependant on the load. Hence, tires can't be labelled with a recommended tire pressure. Tire pressure does affect the car's handling. For instance, overinflating your tires compared to the vehicle's correct tire pressure generally reduces the friction between the road and the tires. True, you may use the maximum pressure, but that doesn't imply you should always use it.
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Post by RedRooJusty on Oct 19, 2010 11:22:32 GMT -5
Quote from National Highway Traffic Safety Administration (NHTSA): "Remember, however, that the vehicle manufacturer, not the tire manufacturer, determines the correct tire pressure for the tires on your vehicle." They say vehicle manufacturer, by OEM tire size, load rating, and handling rating. So go ask the Vehicle manufacturer, and let Subaru suggest you find an exact tire model that hasn't been made in 15 years. Why does NHTSA give this advice? Lack of patience? Recommended tire pressure is dependant on the load. Hence, tires can't be labelled with a recommended tire pressure. Tire pressure does affect the car's handling. For instance, overinflating your tires compared to the vehicle's correct tire pressure generally reduces the friction between the road and the tires. True, you may use the maximum pressure, but that doesn't imply you should always use it. If you had the patience to read my previous posting I said: "What's implied by the tire vendor? You can run you tires to any pressure below the maximum, just do not exceed it. " Did I tell you to run at the maximum pressure ? Notice the doorplate has a OEM tire size 165/65/13 along with the 30/30psi? Are you running this size? NHTSA says I can only run the OEM tire as put forth by the vehicle manufacturer as well (take note everyone not on OEM tire sizes, running around all nilly-willy). I personally am running a +1/+1 175/70/13 tire. Overpressure (and overload) of a tire is determined by the tire vendor. My tires are not OEM, my tires are rated to a max pressure at a max load. Since my car puts only half the rated load per wheel, I am free to run them at a range of pressures as I choose (not exceeding max). Today I choose 40psi as I get less rolling resistance, better handling, and have recorded my best gas mileage. Oh and it is perfectly allowable by the tire vendor,( and Danger is my middle name ). In the winter snow and ice, I choose to pressure down to ~30psi. If you really want the answer go to your tire vendor and see if they have an application chart for a given tire. Tell them the weight of the vehicle , pressure ratio, and exact tire model. When I replaced the tires on my wife's SUV the tire-shop put the tires (OEM size) at OEM pressure. The SUV handled awful like I was driving on four flat tires. After a couple of return trips to the tire-shop to correct this, they ultimately stood fast at the OEM pressure they had in their book (not even what was on the vehicle door plate). Arguing the door plate number to them, they told me flat out the pressure is determined by the tire manufacturer, and that the door plate only matched the OEM tire model shipped with the vehicle. Frustrated by this I called the tire vendor. I gave Firestone my vehicle model / weight / OEM ratio / and exact tire model. Firestone gave me the exact pressure each tire should be at corrected for my application, the wife's vehicle handles like new again. The corrected pressures for the SUV were higher than the doorplate numbers by a couple psi, but they clearly did not exceed the MAX rating on the sidewall. -RRJ
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nsj93
Justy 1.2 GL II 4WD
Posts: 14
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Post by nsj93 on Oct 19, 2010 13:13:35 GMT -5
Did I tell you to run at the maximum pressure ? You said this is absolutely correct: " Always always always look at the sidewall of your tire and read the recommended pressures. You might need more like 44PSI depending on what tires you currently have." Since the sidewalls are labelled with the maximum pressure, this can be a misleading advice. (And as you can see, Patience is my middle name.
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Post by RedRooJusty on Oct 19, 2010 14:21:53 GMT -5
Did I tell you to run at the maximum pressure ? You said this is absolutely correct: " Always always always look at the sidewall of your tire and read the recommended pressures. You might need more like 44PSI depending on what tires you currently have." Since the sidewalls are labelled with the maximum pressure, this can be a misleading advice. (And as you can see, Patience is my middle name. I see your point but I believe you are reading into **seattlejusty**'s statement wrong, he never said "set the tires to the max pressure" either. I agree he could be more clear about where to source the recommended pressure, as this info is not on the sidewall of the tire. I say the tire manufacturer suggestion supersedes the outdated OEM vehicle manufacturer suggestion. The tire manufacturer engineered the tire, they have the correct answer for that specific model of tire. Always Always read the sidewall of the tire, and don't exceed the limits put forth. -I hope this helps clarify -RRJ
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Post by xtremzj on Dec 10, 2010 2:07:56 GMT -5
always go by the car recommendations, not the tire
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