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#16
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A tire is safer if it is run at its max inflation or a couple of pounds less. Not overinflated, not 9psi less as you suggest.
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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. |
#17
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Tire pressure
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Proper inflation pressure is essential for achieving maximum performance and mileage. Improper tire inflation pressure can cause severe internal tire damage, which can lead to sudden tire failure and resulting in serious personal injury or death.Improper inflation pressure may result in rapid or irregular wear. Pressures should always be checked when the tires are cold and at least monthly. Under normal tire operation, approximately 1psi of tire pressure will escape every month. Also, for every 10 degrees F change in ambient temperature, tire pressure will change by approximately 1psi. Vehicle manufacturers list recommended tire pressures for original vehicle tires in the owner's manual or on a placard on the end of the driver's side door or in the glove box. For continuous high speed driving, tire pressures should be increased by 3 to 5psi above the normal cold inflation recommended. However, for passenger tires, never exceed the maximum inflation pressure molded on the sidewall. The inflation pressure for light truck tires may exceed that molded on the tire by 10psi. Any recommended front to rear pressure differential should be maintained. Recommended Inflation Pressure Many people ask "what air pressures do you (meaning tire companies) recommend for cars under normal conditions?" The answer is "we recommend what the vehicle manufacturer recommends." What criteria do the car manufacturers use to determine inflation recommendations * Ride * Load capacity * Traction, wear * Fuel economy/Rolling resistance .....are all correct. But, consider another question: "Why did Ford recommend 30 in the front and 34 in the rear on a 1997 Crown Victoria?" The additional air stiffens the sidewall and makes it more stable. In order to achieve the handling, tracking, and other driving characteristics, one of the things the manufacturer can do is balance front to rear handling by adjusting the tire pressures. In adding the same air pressure in the front as the rear you will change the handling characteristics from what the manufacturer intended. Quite a few station wagons and light trucks have different pressures for the front and rear. But, it's not just station wagons and light trucks; it's also Porsches, Nissans, Corvettes, Hondas, and BMW's to name just a few. Quote from Firestone" Now what tires came on the SVX.1992 225/50/16. but what rating- V-- Z --Wr-- I got Fuzion by firestone --225/50/16 with a ZRi with a wr16 which is a high speed touring tire Max is 51LBS , My sticker shows 28 rear 33 front with stock tires, Tire pressure is hard on the steering senser and the rear end with the LSD also gas mileage |
#18
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Just a reminder that the max recommended on the tyre is a COLD inflation pressure, or at least ambient.
Also the manufacturer will always want the car to ride as smoothly as possible, so they are always using a compromise between comfort (low pressure) and performance/tyre wear etc (higher pressures) - hence what we are finding here that many people run their tyres at higher pressures due to the increase in performance benefits. Other things to consider, especially if your roads aren't the best is that a higher pressure increases your road noise as well. Personally I run 32r/37F cold - always maintaining that 5psi difference. Anything more and she roars at me.. I find you've gotta check your pressures all the time. Certainly makes a difference too, the 4wd system really works (or should I say feels) a lot better if you have the pressures nicely balanced. Matt
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'92 JDM (E) Burgandy/Black 100Km Just Crusin' |
#19
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'92 JDM (E) Burgandy/Black 100Km Just Crusin' |
#20
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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 |
#21
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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. |
#22
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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. |
#23
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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. |
#24
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40F/36R (cold) on my car. Have checked them when hot and read 44psi front.
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David B. SVXipedia @ SVX-IW.COM -- SVX Information Warehouse 2.0 coming...eventually! Ebony 1992 SVX LS-L 5 spd Koni/GC Stebro 187k miles RIP (Rust In Pieces) 1993 SVX 5 spd Koni/GC Stebro Polyurethane bushings still available! |
#25
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47/44 on my 225/45/17
ran right around 40/36 on stockers on the wife's svx with good results. The stock pressure suggestion is ridiculously low. The shoulders run to cords way too fast and the car rides too soft.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#26
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i glanced at the rear rotor and thought humm that thing has a lot of surface rust... WAIT A MINUTE where the f is the caliper?!?! under further examination it seemed that it snaped off right from the slide bolts and the brake hose was being cut off by a bolt nut and two wahers (custom mod there)
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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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#27
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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$hit! |
#28
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dcb |
#29
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#30
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In new york they were really tight on the inspections - yearly for every car registered and they actually performed a good inspection as long as you didn't just go to a shady shop and slip the guy some cash. The cops up there will pull you over in a heartbeat and ticket you for an out of date inspection sitcker also.
In south carolina there are no required vehicle inspections and there are alot of cars on the road with bald tires, taillights that don't work, etc. I hate inspections because it is a pain in the neck to go through every year but I think it does make the roads safer to require inspections.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
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