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Tuesday's Mathematics problem
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Track Ho
 
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Tuesday's Mathematics problem - January 23, 2013, 07:23 AM

So my low tire press warning light came on in my truck yesterday so it sparked this question

I normally put 32 psi of air in my tires. Over time a little air pressure is lost as we all know, but with the super cold temperatures of yesterday my low tire pressure warning light is on. Assume it is 20 degrees F

How much air do I put in so that the air pressure is 32 psi when it reaches 60 degrees again in a couple days?

Oh, and I also want the warning light to turn off, it turns on when the tire pressure is +- 4 psi from 32psi

go

for those of you that are not Orangeshirtdude, hint: thermodynamics


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January 23, 2013, 07:36 AM

You put in whatever amount it takes to turn off the stupid light on the dash. Math problem solved, you are welcome.
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Mojito Anyone?
 
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January 23, 2013, 07:39 AM

blow that bitch out the water.. fill it to the max .duh


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January 23, 2013, 07:40 AM

pv=nrt
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SUPERBITCHIN'
 
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January 23, 2013, 07:41 AM

40psi


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January 23, 2013, 07:42 AM

Wouldn't you need the volume of the tire as well as the weight of the vehicle?


Yeah I am old enough to know better. Thing is, I just don't care.
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January 23, 2013, 08:08 AM

Quote:
Originally Posted by drt_Jumper View Post
You put in whatever amount it takes to turn off the stupid light on the dash. Math problem solved, you are welcome.
Game day bucket go BOOM.


Quote:
Originally Posted by Fitz View Post
My wife wants to get LASIK or a boob job

She asked my opinion

I told her I have no vested interest in making her eyesight better
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Im not really fast enough to notice a difference between tires. I buy the kind thats black and made out of rubber.
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January 23, 2013, 08:10 AM

Quote:
Originally Posted by Slider View Post
Wouldn't you need the volume of the tire as well as the weight of the vehicle?
You would of course need the volume of the tire, which in this case might not even be a constant if the tire is deflated enough to "squish" down from the weight of the vehicle. The formula still works, but you would need to know the volume of the tire at say 26lb at 20 degrees and 32 lb at 60 degrees.

My recommendation: Set it at 30lb or so. Check it again when the temperature goes back up. It is easy to let out some air at that time.


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January 23, 2013, 08:10 AM

Oh and 32 psi seems pretty low to me. I jack mine up to 42. Then again, I'm also trying to squeeze every little bit of gas mileage I can out of it.


Quote:
Originally Posted by Fitz View Post
My wife wants to get LASIK or a boob job

She asked my opinion

I told her I have no vested interest in making her eyesight better
Quote:
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Im not really fast enough to notice a difference between tires. I buy the kind thats black and made out of rubber.
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January 23, 2013, 08:37 AM

whatever the manufacturer recommends on the side door jam. Should always fill on cold tires.


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January 23, 2013, 08:39 AM

Use nitrogen and you will not have to worry about this math problem!


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January 23, 2013, 08:48 AM

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Use nitrogen and you will not have to worry about this math problem!
This.



“Any man who tries to be good all the time is bound to come to ruin among the great number who are not good. Hence a Prince who wants to keep his authority must learn how not to be good, and use that knowledge, or refrain from using it, as necessity requires”.

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January 23, 2013, 08:58 AM

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Game day bucket go BOOM.


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January 23, 2013, 09:07 AM

Quote:
Originally Posted by Heist View Post
This.
Quote:
Originally Posted by dodge131 View Post
Use nitrogen and you will not have to worry about this math problem!
Actually this statement is incorrect. It has been proven that getting nitrogen for the average consumer is the equivalent to buying snake oil. The only time nitrogen is useful is for being on the race track The tires do not get used enough to make a difference. So dont pay extra money and the extra inconvenience for something that is not useful.

I dont have the source off the top of my head.. think it was mythbusters..or someone else. but you can google as easily as i can.


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January 23, 2013, 09:10 AM

Quote:
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Use CDA and you will not have to worry about this math problem!
fixed.

Humidity is what causes the larger pressure swings. N2 out of a bottle is bone dry. CDA would work just as well. Air coming out of a regular compressor is still wet. Race teams use N2 because it's cheap as fuck.


Imma gon fill my tires with He

Last edited by drz1050; January 23, 2013 at 09:14 AM..
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