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DannyZ
Gentoo Fanboy
Premium
join:2003-01-29
Erie, PA
reply to MooJohn

Re: Tire Inflation ?

said by MooJohn:

The "use the factory sticker" approach makes the huge assumption that the tire itself doesn't matter. As long as you have a round tire with x psi, you're fine. That's not something I'm willing to blindly concede.

There is no way that the ideal inflation for one tire is the ideal for all on a given vehicle. If you change from a 16 to a 17 inch wheel, is that cushy 29 psi still ideal? If you go from a $50 no-name tire to an expensive Pilot Sport, is 29 still ideal?

My last car had different guidelines for different rim sizes on the placard. Also, If you stick to the ratings of the stock tires, PSI should remain the same. Obviously, if you get a tire with a different load index and/or speed rating, the handling characteristics will be different and might require a PSI adjustment to obtain similar wheel response.
--
Out the 10BaseT, through the modem, down the co-ax, over the fiber, across the backhaul, past the edge router, off the network...nothing but net


TheTechGuru

join:2004-03-25
TEXAS
kudos:2
Reviews:
·HughesNet Satell..
·WesTex Connect
One should note, THE PSI NUMBERS ON THE DOOR STICKER ARE INTENDED FOR THE TIRE SIZE PRINTED ON THE DOOR STICKER! DUH!

Sorry I didn't say that when I said to use the door sticker, I over estimated everyone's intelligence and just assumed everyone was intelligent enough to figure that out.

--
CompTIA Network+ Certified


DannyZ
Gentoo Fanboy
Premium
join:2003-01-29
Erie, PA
said by TheTechGuru:

One should note, THE PSI NUMBERS ON THE DOOR STICKER ARE INTENDED FOR THE TIRE SIZE PRINTED ON THE DOOR STICKER! DUH!

It's also optimized for the tire rating, which isn't usually represented on the placard as far as I've seen. That was mostly my point, I was agreeing that different quality tires may have different sweet spots.
--
Out the 10BaseT, through the modem, down the co-ax, over the fiber, across the backhaul, past the edge router, off the network...nothing but net


MooJohn

join:2005-12-18
Milledgeville, GA
kudos:1
Reviews:
·Windstream
reply to TheTechGuru
said by TheTechGuru:

One should note, THE PSI NUMBERS ON THE DOOR STICKER ARE INTENDED FOR THE TIRE SIZE PRINTED ON THE DOOR STICKER! DUH!

Sorry I didn't say that when I said to use the door sticker, I over estimated everyone's intelligence and just assumed everyone was intelligent enough to figure that out.

Ah ha! So at that point one's personal judgement is perfectly capable of determining the proper inflation pressure whereas with stock tires the same reasoning cannot be trusted. I am able to determine the proper pressure of aftermarket tires but if the car came with the same size from the OEM then I would have zero input.

Makes perfect sense.

Who knew such infallible automotive wisdom was contained on the little silver sticker inside the door jamb?
--
John M - Cranky network guy


TheTechGuru

join:2004-03-25
TEXAS
kudos:2
Reviews:
·HughesNet Satell..
·WesTex Connect
reply to Bob4
said by Bob4:

My low pressure light came on last night. Drove home and I see all four tires are low (~27 psi, should be 32). So now I have to put air in, and I hate those new machines at the gas stations.

Everyone should own a basic tanked air compressor IMO.

»www.homedepot.com/Tools-Hardware···tDisplay
--
CompTIA Network+ Certified


mob
On the next level..
Premium
join:2000-10-07
Reviews:
·SureWest Internet
reply to MooJohn
said by MooJohn:

The "use the factory sticker" approach makes the huge assumption that the tire itself doesn't matter. As long as you have a round tire with x psi, you're fine. That's not something I'm willing to blindly concede.

There is no way that the ideal inflation for one tire is the ideal for all on a given vehicle. If you change from a 16 to a 17 inch wheel, is that cushy 29 psi still ideal? If you go from a $50 no-name tire to an expensive Pilot Sport, is 29 still ideal?

That doesn't even address the factors that make up the "ideal" point either. What is ideal? Is it the softest ride? Is it the minimum without risking tire damage? Is it harmonically tuned to the suspension resonances? We just don't know. At the recommended pressure, my car rides like a Lincoln -- because it is one. At 35 it rides the way I want it to. Guess where it's staying?

The sticker is ok for the OEM-equipped tires only. After that, using it might not get you killed but there's no way it is certain to be the ideal pressure either. There are just too many variables to accept it as gospel.

I switched from 18" rims to 20" rims. When I first had the 20" rims on, I ran the tires at 40 PSI, then went back to 35 PSI like the door jamb said after finding the ride to be too rough and having less grip than the smaller stock sized tires. Once I dropped the pressure on the tires the ride became close to what it was like on the stock rims and the grip went up dramatically.
--
Ich habe kein Mitleid - Me
You're a daisy if you do. - Doc Holliday
And as always, have nice day.

Bob4
Account deleted

join:2012-07-22
New Jersey
Reviews:
·Optimum Online
reply to Bob4
said by Bob4:

I think I'll stop at Lowes and get one of these »www.lowes.com/pd_146781-40883-KL···=3522750
(was mentioned in the other thread)

So I got the Kobalt unit. It's pretty nice, although noisy as hell. It has a digital PSI display. You just set the desired pressure, hit start, and it runs & shuts off automatically when the target pressure is reached.

Only thing that concerns me is that I can see sparks inside the unit when it's running. I guess it's the motor commutator??


shdesigns
Powered By Infinite Improbabilty Drive
Premium
join:2000-12-01
Stone Mountain, GA
Reviews:
·EarthLink
·Comcast
·Atlantic Nexus
Yes, most compressors these days are real loud. The sparks probably are the brushes.

Hope it lasts; I never have had luck with those small compressors. I would have gotten a real one with a tank, but they start near $100.

I have a small Kobalt 3 gal compressor I picked up off CL. It works ok but has a bit of burning smell when it works hard. Probably dust on the compressor. Don't use it much as I have a big compressor for the garage.
--
Scott Henion

Embedded Systems Consultant,
SHDesigns home - DIY Welder


Rifleman
Premium
join:2004-02-09
p1a
reply to Rifleman
These tires are W rated for speed. I'm 6 pounds over the sticker recommendation on the car and 12 under the tire's recommendation. It seems good to me by the seat of the pants feeling. I do get that weird harminic noise at 45--50MPH but wondering if it may be a wheel bearing. My hearing is badly impaired so hard to tell. I'll get it checked out when I change the oil next week.


Lurch77
Premium
join:2001-11-22
Oconto, WI
kudos:4
reply to TheTechGuru
said by TheTechGuru:

One should note, THE PSI NUMBERS ON THE DOOR STICKER ARE INTENDED FOR THE TIRE SIZE PRINTED ON THE DOOR STICKER! DUH!


You are confusing air volume with air pressure. There are other factors to consider when determinging pressure, but the basic size of the tire has little to do with it.
»blog.tirerack.com/blog/tire-talk···ire-size

Bob4
Account deleted

join:2012-07-22
New Jersey
Reviews:
·Optimum Online
reply to Rifleman
said by Rifleman:

I'm 6 pounds over the sticker recommendation on the car and 12 under the tire's recommendation.

I think you mean to say "tire's maximum".


Rifleman
Premium
join:2004-02-09
p1a
Yeah. I guess. It's working Ok for me so will leave it as is. drove a hard 2600kms in 4 days on them with no problems.

Beezel

join:2008-12-15
Las Vegas, NV
reply to Bob4
said by Bob4:

said by Bob4:

I think I'll stop at Lowes and get one of these »www.lowes.com/pd_146781-40883-KL···=3522750
(was mentioned in the other thread)

So I got the Kobalt unit. It's pretty nice, although noisy as hell. It has a digital PSI display. You just set the desired pressure, hit start, and it runs & shuts off automatically when the target pressure is reached.

Only thing that concerns me is that I can see sparks inside the unit when it's running. I guess it's the motor commutator??

Most oil-less compressors are very noisy. Sparks are normal with most electric motors.