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Old 01-20-2014, 10:03 AM   #76
Guzzi 1
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Quote:
Originally Posted by Dirt Bringer View Post
The recommended tire pressure is a compromise for comfort and performance. The tires are rated to 44psi, and while they will likely change in shape somewhat by increasing air pressure within these numbers, it is not likely to be hugely significant to the point of changing the tread life. Traction is also a relative point depending on conditions. If you are running higher tire pressure you may experience slightly less traction but it is not likely to be a very significant difference unless the tire pressure is massively higher. I believe the Mazda 3 ( a lighter car) uses the same tires as this car but recommends a tire pressure of 36 or 38 on the door sill (had to adjust a friends tire pressures recently).
Well, kind of. The recommended pressure has to do with the specific vehicle and the load it puts on the tire simply put. If a manufacturer recommends a particular tire pressure it is supposed keep the entire contact patch even across the width of the tire. This is based on vehicle weight, weight distribution, and tire size, etc. If you over inflate a tire, you will cause the center to wear faster then the edges. An under inflated tire will wear the edges at a greater rate than the center. As an aside, tire pressures on a motorcycle even vary with the weight you carry, so there is a recommendation for both loaded and unloaded weight, which is defined in the owners manual.

Even if you have the same tire size on two different cars, that does not mean the pressure will be the same recommended by the manufacturer. The car could be lighter over all, but have more of its weight up front requiring a different pressure. So to compare a Corola, (or Mazda 3) to an Impreza is apples and oranges.

Tire manufacturers state the maximum pressure the tire can hold and still be safely run. Best guess somewhere below whatever its burst pressure is, maybe 80%. Just because you can put 45 lbs. of air in the tire does not mean that is the right amount for any given vehicle. Vehicle manufacturers don't just make these numbers up.

If you really wanted to be anal about tire pressures, buy a pyrometer, (they go for 20 bucks and go sky high from there), and take readings in the center of the tread and the edges. Do this when the tire is hot and adjust the pressure accordingly.

John
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Old 01-20-2014, 10:33 AM   #77
sgoldste01
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Quote:
Originally Posted by Guzzi 1 View Post
Torque steer is a result of unequal length half shafts. Subaru is not unequal, to the best of my knowledge.
That is correct. Avoiding torque steer is one big advantage of Subaru's Symmetrical AWD. It's not just marketing fluff. Symmetrical AWD is truly an excellent system, and is one reason many of us enjoy driving Subarus.
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Old 01-20-2014, 07:54 PM   #78
tenaciousZ
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honestly, the STI rear sway bar was an immediately noticeable improvement. I've had it in for over a month and my wife just drove my car alone for the first time yesterday and actually commented how much better it handles. If you knew her you'd know that she pays no attention to things like that and I didn't even ask her to report back. Don't expect to be driving a $100K supercar, but do expect all ur favorite road curves to be more enjoyable.

My '12 sport premium already had the 16mm bar so the install was a quick unbolt and refasten using the stock endlinks (new bushings, however). Make sure to observe the stock bar and put the new one in correctly, as i read one members post who put it in backwards at first.

The bar should be installed with the suspension loaded (i.e. weight of the car on the wheels) so I just shimmied under there. this is a good bang for ur buck mod.
Quote:
Originally Posted by LickitySplit View Post
tenaciousZ, any improvement with the RSB? Anyone add the sway bar to their 2012+ base Impreza, or come up with another solution (other than ditching tires early). I've noticed this on my wife's 2013 wagon premium, which I assume does not have the RSB. It drives me crazy, but thankfully she does not mind it so much.

Regarding installing the RSB + linkages, does this require a lift? How involved is the install?
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Old 01-20-2014, 09:07 PM   #79
jsteg
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Quote:
Originally Posted by Guzzi 1 View Post
Well, kind of. The recommended pressure has to do with the specific vehicle and the load it puts on the tire simply put. If a manufacturer recommends a particular tire pressure it is supposed keep the entire contact patch even across the width of the tire. This is based on vehicle weight, weight distribution, and tire size, etc. If you over inflate a tire, you will cause the center to wear faster then the edges. An under inflated tire will wear the edges at a greater rate than the center. As an aside, tire pressures on a motorcycle even vary with the weight you carry, so there is a recommendation for both loaded and unloaded weight, which is defined in the owners manual. Even if you have the same tire size on two different cars, that does not mean the pressure will be the same recommended by the manufacturer. The car could be lighter over all, but have more of its weight up front requiring a different pressure. So to compare a Corola, (or Mazda 3) to an Impreza is apples and oranges. Tire manufacturers state the maximum pressure the tire can hold and still be safely run. Best guess somewhere below whatever its burst pressure is, maybe 80%. Just because you can put 45 lbs. of air in the tire does not mean that is the right amount for any given vehicle. Vehicle manufacturers don't just make these numbers up. If you really wanted to be anal about tire pressures, buy a pyrometer, (they go for 20 bucks and go sky high from there), and take readings in the center of the tread and the edges. Do this when the tire is hot and adjust the pressure accordingly. John
VERY well said and spot on!! It's a relief to finally see someone who fully understands tire pressures. I can't stand when people inflate to sidewall spec, or compare car A to car B because "they have the same/same size tires." Adjusting plus or minus a pound or two or three up or down, is one thing, but 5, 8, 10, lbs?? Now you're definitely messing with the handling characteristics of the car as well as tread life!
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Old 01-24-2014, 01:08 PM   #80
dragonbear7
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Default My input

Just thought I would add to this.

I have noticed the steering with this car since I got it. It just feels like it doesn't track straight, kinda meanders left or right. At first I thought it drifted left but now I am not so sure anymore. Best way to describe it is if you take your hands off the wheel and grab something in the backseat, watch out, you could go anywhere...

I have different tires than stock, Michelin Primacy, it does it on them. They have been rotated twice, has always done this. I figured I was the only one and thought maybe it was alignment, maybe its the AWD, but now I am not so sure on that anymore with this thread.

Also wanted to add, GF drove the car on long road trip and also complained it took a lot of work to keep it in the lines.
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Old 01-24-2014, 01:23 PM   #81
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Does this even happen on days that aren't windy? That's the only time I really notice this behavior. I drive 8 months out of the year on the stock Yoko tires, and the other 4 months are on snow tires (Bridgestone Blizzak WS60s). I don't notice this behavior with either set of tires.
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Old 02-14-2014, 09:42 AM   #82
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I think I can add that I had a moderately loaded vehicle the other day and I noticed it got squirrelly. Next time your vehicle is heavy see how it does, fairly certain I easily noticed how it kind of wanted to go any old direction.
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Old 02-20-2014, 04:26 PM   #83
whittnierae.27
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I just bought a 2014 limited Impreza and I notice my steering wheel pull to the right as well. It's really hard to control since I'm not used to it. I look off the road for a second and I could be in the other lane or off the road... It's exhausting. Since it's brand new, I feel like the alignment should be great and it has brand new tires on it.. So I'm not sure what the cause of this would be.
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Old 02-20-2014, 08:38 PM   #84
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If your car is pulling to the right, you should have the alignment checked. Barring roads that have a lot of crown, I can let go of my wheel and the car tracks straight.

John
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Old 02-20-2014, 09:37 PM   #85
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Quote:
Originally Posted by Guzzi 1 View Post
If your car is pulling to the right, you should have the alignment checked. Barring roads that have a lot of crown, I can let go of my wheel and the car tracks straight. John
X2
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Old 02-21-2014, 01:37 AM   #86
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Default 2012 Limited

No issues with our Impreza with Yoko's although I hate the tires. My issue was with the Yoko's on our 13 Foz, it was a bad tire same effect described in this thread. So I got rid of it and got a 14 XT and love it. My wife and I both love our Subies.
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Old 03-02-2014, 07:52 PM   #87
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Default allignment issue

I have had my 2013 impreza sport for a year and a month. The rear drivers side tire was severly cupped and the other tires had worn down. I decided to replace the tires today and have it aligned. They found left rear tire was out of alignment -2.3 and that they could not adjust this. Is this a problem I need to take to Subaru? Thanks for any help you can offer.
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Old 03-02-2014, 08:00 PM   #88
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Is it still in spec?
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Old 03-02-2014, 08:02 PM   #89
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Not sure. I was hoping someone on here could help me answer that. What do you mean by spec?

Does this help?

Last edited by ausubimpreza; 03-02-2014 at 08:12 PM.
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Old 03-02-2014, 08:25 PM   #90
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Originally Posted by ausubimpreza View Post


Not sure. I was hoping someone on here could help me answer that. What do you mean by spec?

Does this help?
When I asked if it was "in spec", I was asking if the reading fell within Subaru's design specifications (spec).

Per the graphic you provided, we see that it is not in spec. The spec is from -0.5 degrees to -2.0 degrees. So your -2.3 degrees is out of spec.

I'd let the dealer know, and see what they suggest.
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Old 03-02-2014, 08:38 PM   #91
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Thank you for your help. I'll let you know what they say.
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Old 03-02-2014, 09:26 PM   #92
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Quote:
Originally Posted by ausubimpreza View Post
Thank you for your help. I'll let you know what they say.
Thank you for keeping us posted.

Not that this affects your conversation with the dealership, but I'm curious to know how many miles you have on the car.

Good luck!
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Old 03-02-2014, 09:37 PM   #93
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Just a little over 24,000. Only about a year old which is why I'm confused about it being out of alignment. My main concern is that tire wearing faster than the others. Also, why would you make the rear so that you couldn't adjust it? Seems odd.
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Old 03-02-2014, 10:38 PM   #94
jsteg
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Quote:
Originally Posted by sgoldste01 View Post
When I asked if it was "in spec", I was asking if the reading fell within Subaru's design specifications (spec). Per the graphic you provided, we see that it is not in spec. The spec is from -0.5 degrees to -2.0 degrees. So your -2.3 degrees is out of spec. I'd let the dealer know, and see what they suggest.
They're not going to do anything. It's barely out and it was designed with zero adjustment. It's also very likely that with it being 3/10ths of a degree out of spec, that you could put it back up on the alignment machine and it could be within spec. There's nothing they can do and it's not a defect. As I said in the other thread where this was posted, all the more reason to stick to a strict rotation schedule, and one more reason why I don't like uni-directional tires.
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