Tire Pressure and gas

[rachunter]

Chris,

I understand what you are saying about the chalk mimicing tire wear.

My point is that you are mimicing tire wear in a unrealistic way. What you are doing will show you exactly how your tire will wear in a parking lot at very slow speed, in a straight line with low tire temps.

How your tire wears under the above conditions are very different than how your tire will wear at highway speeds and normal operating temps.

As far as the dragster tire, I know that was kind of a extreme example. I was just trying to make a point.

Street tires are designed to keep their shape under all speeds for wich they are rated.

With your above statement in mind think of the following 3 questions.
If you overinflate a normal street tire by 20 psi how will it wear?
Now if you underinflate the same stree tire by 20psi, how will it wear?
Now ask yourself, are you changing the shape/contact patch of this tire???

I respect your opinion and also the opinion of ridgerunner, they are just different from mine.... no harm, no foul.

[chris4x4]

Originally Posted by rachunter

My point is that you are mimicing tire wear in a unrealistic way. What you are doing will show you exactly how your tire will wear in a parking lot at very slow speed, in a straight line with low tire temps.

It is in no way Unrealistic. The point of this method is to accuratly determine the tires propper "cold" psi, for THAT vehicle at THAT weight. "Cold" psi for a tire should allow the contact patch of the particular tire to have an even contact with the road. I.E. equal ground pressure from the inside tread to the outside tread. Useing Chaulk allows you to see where you're tire is not contacting the ground, and therefore adjust your psi accordingly. Unless your psi is already too low, which is why you should start at a higher psi and work down.

Originally Posted by rachunter

How your tire wears under the above conditions are very different than how your tire will wear at highway speeds and normal operating temps.

Like I stated before, we are talking about COLD tire psi.

Originally Posted by rachunter

With your above statement in mind think of the following 3 questions.
If you overinflate a normal street tire by 20 psi how will it wear?
Now if you underinflate the same stree tire by 20psi, how will it wear?
Now ask yourself, are you changing the shape/contact patch of this tire???

Here, you are going to extremes to make a point that I am not seeing. Yes, Overinflating a tire is not good. Yes, Underinflating a tire is not good. What I was trying to explain to you, is that when the tire is at the PROPPER psi, you will not see a significant increase or decrease in size. Have you watched a street tire spinning at 100+ m.p.h.?

Originally Posted by rachunter

I respect your opinion and also the opinion of ridgerunner, they are just different from mine.... no harm, no foul.

Im trying to figure out what your opinion on finding the propper tire psi for a given tire/vehicle combo is. Please tell us.
FWIW, I have used this method with tires of all kinds and in many conditions, including hauling heavy loads, towing trailers, and when adjusting/ tuning cars for SCCA, solo 1 and 2.

[chris4x4]

Originally Posted by rachunter

You had a good plan but your signature line says it best.....

"The simplest solutions are often the most clever..........they are also usually wrong."

FWIW, my method of determining tire pressure is by far NOT a simple way. And, it is NOT wrong. Im still waiting for you to tell me otherwise.,

[rachunter]

The point of this method is to accuratly determine the tires propper "cold" psi, for THAT vehicle at THAT weight.

Well maybe that is where I was confused. So you know a way to figure out the proper "cold" pressure for tires. I will remember that the next time I put a vehicle in storage. You did not mention "cold' pressure until the last thread.

Here, you are going to extremes to make a point that I am not seeing.

Extreme, I asked three simple questions and you answered none of them. If you had answered the questions maybe you would have got the point.

Have you watched a street tire spinning at 100+ m.p.h.?

Have you measured a street tire going 100+ m.p.h.?

Quote:
Originally Posted by rachunter
I respect your opinion and also the opinion of ridgerunner, they are just different from mine.... no harm, no foul.

This was me trying to be nice and agree to disagree.

[chris4x4]

Rachunter,
Re read my posts. Slowly. You have not given any more input to this thread than to say that I am wrong. I am starting to feel as though I am trying to convince a child. You dont like what I wrote and do not want to post what you feel is a better way. I have answered your questions and given examples. Do a search on the method I listed, then give a LOGICAL argument, with a PROBABLE solution, rather than say things like " I will remember that the next time I put a vehicle in storage?" I HAVE seen tires at high speeds. I havent mesured them as I stated earlier that the differences in size are insignificant. If the way I determine cold psi for tires is incorect, PLEASE tell me what is correct?

[chris4x4]

http://www.jeepfan.com/tech/tire-pressure-chalk.php
http://www.jpmagazine.com/techarticl...nce/index.html
http://forum.ih8mud.com/chit-chat-se...s-correct.html
Post #8
http://www.automedia.com/Optimizing_...cr20010801tp/1
Rachunter, Im guessing that all these people are wrong as well?

[Ridgerunner]

Hey rac-you do Not express an opinion here. You criticise Chris' method. Then you offer No alternative method. Then you use HIS signature to slap him in the face as if to say "practice what you preach". Sure you are entitled to an opinion here! WHAT IS IT???? Sure you can critique Chris' chalk method! WHERE"S THE ALTERNATIVE METHOD YOU USE TO PROVE HIS IS WRONG???? If you cannot answer the two simple questions here, then you are critisizing just to be critisizing! Waste of time

[Imrubicon]

Originally Posted by chris4x4

http://www.jeepfan.com/tech/tire-pressure-chalk.php
http://www.jpmagazine.com/techarticl...nce/index.html
http://forum.ih8mud.com/chit-chat-se...s-correct.html
Post #8
http://www.automedia.com/Optimizing_...cr20010801tp/1
Rachunter, Im guessing that all these people are wrong as well?

These methods are what is common on the Jeep BBs as running oversize tires you can not follow the door sticker.
I have not done this yet on the Tacoma but they loaded the tires at 29 and they are too soft for sure.
Now they ride really nice but I can tell by looking they are low for the weight they are carrying.
The new nubs on the tires wore off on the outside first

[luk8272]

I know I should stay out but here we go.

The chalk method works because if you check your tires frequently. No matter how your tires wear when you check them in the mornings with the chalk method it will show how they have worn for the last week no matter how you drive, then you compensate your psi to accomadate the shape your tires are taking.
It is just faster to chalk your tires then to walk around looking at them and trying to figure out what psi you think should be in them. That is my take on the whole thing. I agree with all parties here seeing as how there is almost always more than one way to achieve the same answer. Thanks for the input I have learned a bunch here, and will be applying it to my truck form here on out, wether it increases my mpg or just the life of my tires.

[Ridgerunner]

Originally Posted by luk8272

I know I should stay out but here we go.

The chalk method works because if you check your tires frequently. No matter how your tires wear when you check them in the mornings with the chalk method it will show how they have worn for the last week no matter how you drive, then you compensate your psi to accomadate the shape your tires are taking.
It is just faster to chalk your tires then to walk around looking at them and trying to figure out what psi you think should be in them. That is my take on the whole thing. I agree with all parties here seeing as how there is almost always more than one way to achieve the same answer. Thanks for the input I have learned a bunch here, and will be applying it to my truck form here on out, wether it increases my mpg or just the life of my tires.

WHAT??!! ARE YOU SERIOUS? HOW DARE YOU..just kidding now get outa here LOL

[luk8272]

I'm back and according to me and only me I went from 60psi to 50 in front and 53 in the rear. whew.

[Ridgerunner]

Originally Posted by luk8272

I'm back and according to me and only me I went from 60psi to 50 in front and 53 in the rear. whew.

luk whats your max tire pressure allowed on the sidewall?

[luk8272]

65psi max if i'm not mistaken I usually run 5lbs less than what the tires call for.

[Ridgerunner]

Originally Posted by luk8272

65psi max if i'm not mistaken I usually run 5lbs less than what the tires call for.

WOW-Ive never run across tires w/ that high a max-just curious

[luk8272]

BFG T/A KO 65psi max cold. 33"

[chris4x4]

Originally Posted by Ridgerunner

WOW-Ive never run across tires w/ that high a max-just curious

The tires on my Ram max at 85.

[Ridgerunner]

Originally Posted by chris4x4

The tires on my Ram max at 85.

Whats the deally w/that Chris-does it take that much to "fill out" that tire's construction? How come mine are only 35?

[chris4x4]

Originally Posted by Ridgerunner

Whats the deally w/that Chris-does it take that much to "fill out" that tire's construction? How come mine are only 35?

My Ram is a 3/4 ton. I tow a 11,000 lbs. Toy hauler, and a 14,500 lbs. 5th wheel. Those tires are designed for the weight. Your tires are probably good for 2000# each. It should say on the side wall. LT, tires are "Light Truck" usually good for hauling 1000# or more weight, not for towing heavy trailers, or carying 3000# in the bed.

[Ridgerunner]

Shoot I shoulda figured that-Im gettin senile Thanks Chris.