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Thread: Those with 17's, what PSI do you run? Reply to Thread
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  Topic Review (Newest First)
09-25-2006 05:37 PM
MikeW Carcass heat decreases with increased tire pressure.
Tread heat increases with increased tire presssure.

There is a friction versus temperature graph per tire. Winter tires work better a below 50, summer tires work at temps greater than 50. All seasons work 0-100 f.
There was a recent advertising suplement from Continental that said we should all switch at the magic 45F temp from summers to winter.
09-24-2006 08:25 PM
Mr.Dodge hey everyone remember the firestone deal? those were under inflated tires,with a driver at high speeds? wanna know why they blew up? because they were 1, under inflated 2, drivin at high speeds. So this will cause, guess what a tire to heat up and go boom...
09-24-2006 12:34 PM
TERMINATOR101CA
Quote:
Originally Posted by Big3
Actually I am an engineer. Your tires will run much hotter at those pressures and will shorten their life, in addition to causing abnormal wear patters. Now I'll shut my mouth fucker.
Actually you're just a tool who doesn't know what he's talking about, and I wouldn't want to be the one trying out stuff "engineered" by you. I was trying to prevent any more jewels coming out of you when I politely asked you to shut it...eventually you aired it again. Please learn how to use Google, it might help your career future.
So you just proved to everybody how much you know, now go back under the rock you came from Mr. Troll Engineer. Tire flex causes high temps and having a higher PSI reduces tire flex thus, it reduces temperature. And also exesive flexing of the sidewall will cause it to weaken and be more prone to the tire giving out. High PSI on the other hand will make the sidewal stiffer and the only real risk is when hitting a 2x4 on the highway and have it explode wich would happen with an underinflated tire anyway if the speed is right. Other downfall is the punishent you will get from a harsher ride on yourself and suspension components, other than that all is dandy.
09-24-2006 03:51 AM
linuxglobal
Quote:
Originally Posted by smc1377
I should clarify. I didn't know who he was talking to. I'm assuming that he's talking to the people who are overinflating their tires, but then he claimed to be an engineer and that it would overheat the tires.

But any real engineer in this field or a related field would know that overinflating does not cause tires to overheat. Underinflating them is what causes tires to overheat. So that's why I was wondering what he meant.
LOl i dont know anything about tires so its all the same to me....

makes sense that if more rubber is pushed down on it would lead to more heat (ie underinflation). But im not an engineer and ive never actually tested tires..

We should all take pics of our tires at diff pressures for comparissons, that would make for a nice faq...
09-24-2006 01:50 AM
smc1377 I should clarify. I didn't know who he was talking to. I'm assuming that he's talking to the people who are overinflating their tires, but then he claimed to be an engineer and that it would overheat the tires.

But any real engineer in this field or a related field would know that overinflating does not cause tires to overheat. Underinflating them is what causes tires to overheat. So that's why I was wondering what he meant.
09-24-2006 01:12 AM
linuxglobal
Quote:
Originally Posted by smc1377
At what pressure are you referring to?
he means outside the recommended vehicle pressure(little sticker on the inner door)... ie anything other than 30 psi or around there as other members have suggested 35-45.

I dunno, i just found out how serious of an issue it really is.
09-24-2006 01:10 AM
smc1377
Quote:
Originally Posted by Big3
Actually I am an engineer. Your tires will run much hotter at those pressures and will shorten their life, in addition to causing abnormal wear patters. Now I'll shut my mouth fucker.
At what pressure are you referring to?
09-24-2006 12:19 AM
Big3 Actually I am an engineer. Your tires will run much hotter at those pressures and will shorten their life, in addition to causing abnormal wear patters. Now I'll shut my mouth fucker.
09-22-2006 09:22 PM
DJDiggler Sorry if I've offended anyone here.... I was excited to share what I'm experienced in. If I knew computers I'd be in a thread over there. Didn't think my posts were condesending but if anyone took them that way, again I'm sorry.

Linuxglobal is right it's not even a important issue, do what works for you.
09-22-2006 08:47 PM
smc1377
Quote:
Originally Posted by DJDiggler
Common sense does make you think your tire looks low but they are not...

http://en.wikipedia.org/wiki/Radial_tire


They are designed to look bulged... and yes larger rims mean less sidewall, hit a pothole and bend a rim.... Nothing you can do about that.
Seriously, I don't know who got your panties in a bunch. Don't assume I'm some kind of idiot who don't know a thing about tires.

You have not seen my trep on those tires so you have no idea what I was talking about. I'm not talking about a "slight bulge" like your article stated. I don't even know why you would waste your time looking that up. Don't start talking about common sense without even knowing what I'm talking about.

I stated that the overall diameter was much smaller than stock, which should have given you the hint that these aren't just your typical plus one size. We are talking about 17's and when I said 45 series tires, it should have rang some kind of alarm that says that a normal plus one would not drop the sidewall aspect ratio down to 45 series unless these are super wide tires, which they are not. Apparently your super knowledge of tires failed you. Excuse me for assuming that a tire tech of 8 years would immediately recognize that fact. BTW, they were 205/45/17's.

If you would have seen them, you would have upped the psi, I guarantee it.

Only one person that I know of has actual pics of the setup, RapidTransit. He took pictures of them at a meet. Trust me, if you could see the tires even at 42 psi, you'd still notice quite a bulge on the sidewall and notice how low the lip of the rim still is. Then imagine it with even less air.
09-22-2006 05:32 PM
TERMINATOR101CA
Quote:
Originally Posted by Big3
So terminator, where did you go to school to get your engineering degree? I am sure the veh makers just pull those numbers out of their ass. If you fill them up to about 60 psi think of the fuel mileage you would get then!
Dude shut your mouth !! I never said to inflate the tires to 60 or whatever don't patronize me. If you read my post (if you know how to read) you will se that all I said was that the plaque spec isn't OK for ME, and that I run my tires 37-38 fronts and 35-36 rears. Where do you come with all that bullshit you post without understanding what I said, or you just looking for beef ??? I never forced any of you to inflate your tires to what I have anyway, but I gues YOUR engenieering degree got in your eyes and didn't let your little brain focus on what I REALLY said ! There, now I'm done with this thread !!
As for everybody else I just expressed my own opinion wich has worked fine for me so far !!
09-22-2006 10:08 AM
linuxglobal man o man, so many problems over tire pressure.

Is it even that critical??? Maybe the rough range would be better to agree on like 30-40 PSI??? Im sure the tires can take it if people like 30 or 35, even 40. Im sure if they are running that pressure they must know if the tires are getting worn properly and such.

I myself havent noticed any issues at 30psi, but then again ive never tried higher pressures so i cant comment. Personally ive never really looked into it that much, my dealer set all of my pressures when i got the car and ive been using that setting ever since.

Good luck guys,
09-22-2006 04:50 AM
DJDiggler Common sense does make you think your tire looks low but they are not...

http://en.wikipedia.org/wiki/Radial_tire
Quote:
By comparison, radial tires lay all of the cord plies at 90 degrees to the direction of travel (that is, across the tire from lip to lip). This design avoids having the plies rub against each other as the tire flexes, reducing the rolling friction of the tire. This allows vehicles with radial tires to achieve better fuel economy than vehicles with bias-ply tires. It also accounts for the slightly "low on air" (bulging) look that radial tire sidewalls have, especially when compared to bias-ply tires.
They are designed to look bulged... and yes larger rims mean less sidewall, hit a pothole and bend a rim.... Nothing you can do about that.
09-22-2006 03:58 AM
smc1377 Though I've always heard that following the car's placard is the way to go, when I threw on my brother's 17's on my car with some 45 series tires (the overall diameter was smaller than stock), I had to overinflate just to keep the wheels from hitting the ground. At 32 psi, it seriously looked like I had a flat tire. The max on those tires was very high, like 48 psi or something. I had it inflated to something like 42 psi in the front just to get the tires to look right. It rode and handled just fine, much better than stock.

So I guess what I'm saying it, go with the placard unless common sense tells you otherwise.
09-22-2006 12:42 AM
Big3 From Tire Rack's website:

While a wide variety of tire sizes are available to fit the many different vehicles in use today, almost every tire size can be used on more than one vehicle. Therefore it is the vehicle manufacturers that ultimately determine the tire inflation pressures they believe best fine-tune the tires' capabilities to their specific vehicle makes and models.

The pounds per square inch (psi) pressure number branded on the tire's sidewall identifies the maximum cold inflation pressure that specific tire is rated to hold. However, the tire's maximum pressure is not necessarily the correct pressure for every vehicle upon which the tire can be used (almost all vehicle manufacturers' recommended tire inflation pressures are less than the tires' maximum pressure).

Therefore when checking and adjusting tire inflation pressures, the "right" inflation pressures are those provided by the vehicle manufacturer, not the "maximum" inflation pressure branded on the tire's sidewall. The vehicle manufacturer's pressure recommendation can be found on the vehicle's tire information placard label, as well as in the vehicle owner's manual.
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