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Tire pressure
Does everyone use the tire pressure rating that is on the sticker on the SVX or the tire itself, I have the stock tires and all 225/50/16 it says 28lbs in the rear and 33lbs in the front to me that is sort of low tire pressure for the weight of this vehicle, is there a update on this somewhere or is this correct.
Thanks Art |
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dcb |
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I run about the same pressure as you do. (38 front/33 rear) That seems to be about right.
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. Earl .... ... .... ><SVX(*> Subaru Ambassador [COLOR=”silver”]1992 Tri Color L[/COLOR] ~45K (06/91) #2430 1992 Dark Teal LS-L ~184K (05/91) #0739 1992 Claret LS-L ~196K (05/91) #0831 1992 Pearl LS-L ~103K (06/91) #1680 1992 Pearl LS-L ~151K (06/91) #2229 1992 Dark Teal LS ~150K (07/91) #3098 (parts car) 1992 White LS-L ~139K (08/92) #6913 1993 25th AE ~98K (02/93) #164 1993 25th AE ~58K (02/93) #176 1993 25th AE ~107K (02/93) #215 1993 25th AE ~162K (02/93) #223 1994 Laguna Blue Pearl LSi ~124K (1/94) #2408 1994 Laguna Blue Pearl LSi ~144K (10/93) #1484 1994 Laguna Blue Pearl LSi ~68K (10/93) #1525 1994 Barcelona Red LSi ~46K (02/94) #2624 1994 Pearl LSi ~41K (12/93) #1961 1995 Bordeaux Pearl LSi ~70K (02/95) #855 1996 Polo Green LSi ~95K (03/96) #872 1997 Bordeaux Pearl LSi ~55K (08/96) #097 2003 Brilliant Red LS1 Convertible ~29K (04/03) #8951 1999 Magnetic Red LS1 Coupe ~33K (04/99) #6420 My Email | Old Locker | New Locker | Picture of 15 of the 19 |
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I use the numbers on the tire itself, which are around 40psi, but if I had stock diameter tires I would still use the tire's numbers.
You can always eyeball the sidewalls to see if your pressure is good.
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"That which can be asserted without evidence can be dismissed without evidence." '92 Dark Teal SVX LS-L, >146,000m 3 pedals, 5 speeds., restoration underway. 2012 Honda Insight, slow but cute. |
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Ohh ok ohh boy i deal with this every day at my tire shop... 1. NEVER inflate your tire to the pressure it says on the tire! that is a very bad idea... early seporation will occor that number is the MAX the tire it self can handle 2. you can NOT tell by eyeballing the side wall that is a bad idea that leads people to fill their tires with 60+ pounds of air (no joke i see it once a week) 3. dont even think of going over 35 psi unless you own a 3/4 ton truck when your tires get hot the pressure can increase to over 40 psi (the max psi the tire can handle.. at this point a blow out may occur) IF you really think the stock tire pressure is inacurate then there is a test that can be done put a puddle of water down on a level surface like a drive way or parking lot start with the stock recomendations and drive over the water.. messure the tred width it should match up with the width of the tire (225 mm) if its too wide add air and repeat if its too narrow drop the pressure and repeat.. do the same thing with the back tires.. this test is a little pointless because you should get the same numbers as the factory did because they ran simalir tests when figuring out proper air pressure
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- John ASE certified Master Tech W/ X1 Twin City Fleet repair, St. Paul, MN need work done? Have tools will travel
Last edited by Suby Fan; 05-06-2006 at 08:15 PM. |
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When? Quote:
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I assumed we were talking to people that aren't stupid about tires.
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"That which can be asserted without evidence can be dismissed without evidence." '92 Dark Teal SVX LS-L, >146,000m 3 pedals, 5 speeds., restoration underway. 2012 Honda Insight, slow but cute. Last edited by NikFu S.; 05-06-2006 at 08:19 PM. |
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[QUOTE=NikFu S.]Separation of what?
When? the tire is made up of diffent lairs of tred they can separate and cause what looks like a baseball coming out of your tire You can tell if they are as low as 25lbs, and no one with sense would over pump their tires by 20-30lbs. its a conundrum.. any one with sence should have a tire guage in their car to begin with... These tires are tall enough the sidewalls flare at less than 36psi. I could tell by looking at my front left tire it was low. I went to the pump and it was indeed 4-5lbs low. I brought it up to 40psi, which is what Sears filled it to when they installed them. its not the hight of a tire... i could tell when my geo tires were low easyer then my svx tires... why? because svxs have a lower profile tire... that makes the side wall harder... so you are able to tell when the tire is underinflated but not when it is over inflated I assumed we were talking to people that aren't stupid about tires. the thing is that 99% of the population is ingnorant about tires... its a very unknowen thing in the automotive industry... even the most skilled master techs really dont know squat about tires...
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- John ASE certified Master Tech W/ X1 Twin City Fleet repair, St. Paul, MN need work done? Have tools will travel
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Published figures are only a very broad guide and should not be strictly adhered to. These figures can at best be nothing more than a guide. Factors relating to, car weight, loading, road surfaces, city commuting/highway driving, racing, driver preferences, wear factor, rim width, etc. all come into the equation. The sales pitch of sellers is of no account, the wear factor being their major interest. Observing the side wall deflection most certainly IS a very good method of accessing the results of ones judgement. It is a true indication of the expected deflection of the side walls. An accurate final assessment and choice can not be made by anyone other than the driver. Accepted that this should be made intelligently.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
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Higher
I run 40lbs in my Z rated tires.
Lee
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SVXx2 92 SVX LS-L Silver 92 SVX LS-L Burgundy (structurally challenged with 2792 miles) 96 SVX LSi Red 92 SVX LS Pearl (Parts) 01 F150 4X4 Red (+6 with other members of the family) FREEDOM IS NOT FREE |
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Most certainly you can inflate to the maximum pressure and run them there for the entire life span of the tire. (which will be quite lengthy if you keep them there) The 32psi rule went out with the subaru brat.
I would NEVER run a tire at 32 psi if the maximum inflation is higher. (this is my personal choice) Now as Trevor suggested if your personal taste if different then adjust them down but not too much. Underinflation can cause the tire to overheat and fail. Case in point. The original tires on my wifes galant clocked 64k miles before I replaced them. I ran them at the max pressure. These were 50k tires. No signs of any problem other than normal treadwear.
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ASE Master and L1 cert. Discounted Repairs I feel a lot more like I do now then I did before. 92 SVX 5spd, (sold),92 SVX Teal, 67 Mustang 351C 5spd, 00 Galant. |
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I started "over"-inflating my tires years ago on the suggestion of a garage owner after I wondered aloud what it was about my driving style that scrubbed tread off the tire shoulder right down to the cord while leaving plenty of healthy tread in the middle. Those few extra pounds of air not only stiffen the sidewall, as others have mentioned, but cause the tire to ride-up more on the center of the tread footprint. Just look at the profile a modern radial under weight and it's easy to understand why they tend to wear more at the shoulder. As an incidental plus, tires with less flex return better fuel economy.
Of course, I agree that one shouldn't exceed the maximum PSI recommended by the tire manufacturer. But generally speaking, UNDER-inflation is the bugabooo that causes heat buildup that can lead to tire (usually sidewall) failure. I had that happen once: Slow leak on an Interstate highway run, started feeling a shudder at reduced speed, took a look and found the tire not flat but very low, but with a big knot in the sidewall, literally smoldering. It's a wonder that thing didn't blow. dcb |
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AJ4U2,
I was not really asking the question that you quoted. It was part of a reply to subyfan. But thanks for answering anyway!!
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ASE Master and L1 cert. Discounted Repairs I feel a lot more like I do now then I did before. 92 SVX 5spd, (sold),92 SVX Teal, 67 Mustang 351C 5spd, 00 Galant. |
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I just have an anecdote from this morning's commute.
I pulled up behind a Pathfinder that seemed to be tilted. I look closer and her rear right tire appeared to be under inflated by about 20lbs... Some people are completely oblivious. Not only drivers, but some teenaged female jaywalked across a 3 lane road without even looking. Luckily she heard the Blizzaks screaming at 40mph as I was about 20ft away cuz I had no intention of stopping for the dumb *****. She had a stupid surprised look on her face like I came out of nowhere. Noisy tires though. Saved her life they did. Stupid ass people.
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"That which can be asserted without evidence can be dismissed without evidence." '92 Dark Teal SVX LS-L, >146,000m 3 pedals, 5 speeds., restoration underway. 2012 Honda Insight, slow but cute. |
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I see it everyday. High schoolers walk across the traffic all the time. They ASSUME that people will see them and they ASSUME that people drive on good brakes. I know otherwise. One dummy with bad brakes runs over another dummy that doesnt look both ways.
I have seen rotors that are completely separated from the hub. I have seen brake pads gone missing and the caliper piston scraping the rotor.
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ASE Master and L1 cert. Discounted Repairs I feel a lot more like I do now then I did before. 92 SVX 5spd, (sold),92 SVX Teal, 67 Mustang 351C 5spd, 00 Galant. |
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