Tyre Pressure

[Kurosagi]

Hey guys so i over inflated my tyres by a good 14 psi when the manufacture reconmend is 34(so i have 48),i was just wondering how much psi release when i deflate it,i can't check because i haven't got a pressure gauge and i inflated my tyre at the petrol station.
But i was just wondering how much actually comes out you guys think per second?

[WhiteLotus]

Deflate it until it's obviously deflated then drive back to the garage and do it again properly. I thought air was free in the UK? It is down where I live.

[Kurosagi]

Deflate it until it's obviously deflated then drive back to the garage and do it again properly. I thought air was free in the UK? It is down where I live.

20p over here =/ i actually paid 90p altogether because i overinflated my tyres to 48psi,because i was a idiot and read my label incorrectly.
1st time i overinflated then i letted some air out on the driver side which had most out which left it flat.
And i letted some air out on passenger side but a little bit because i noticed i flatted the driver side.
So now i wonder how much air goes out when deflating per second so i ensure myself i am safe on passenger side because driving to petrol station twice but to get help from another drive felt embarrassing.
The 2nd time i had to pay 70p(ran out of 20p) to the damn machine inflate the driver side passenger to the correct depth..
So guys any form of estimate how much air comes out per second..?

[WhiteNoise]

Just buy a cheap pressure gauge.

http://www.atvconnection.com/Departments/ATV_Tech/images/tire_pressure_gauge.jpg

[CyberDruid]

The amount released will be variable. More at the highest pressure and least as the pressure reaches 0. So how do you suppose anyone even a Rocket Scientest, could possible estimate the amount of pressure release? It would also vary depending on the size of the tire. A small tire will see a rapid pressure drop a large tire a slower less dramatic pressure drop.

Buy a pressure gauge.

[WhiteNoise]

Not to mention the weight of the car...lol who even thinks like that? Gauges are so cheap...

This thread is scarey...and a little funny.

[twilyth]

You could try to apply Boyle's law of gases (http://en.wikipedia.org/wiki/Boyle%27s_law) but the elasticity of the tire will be a variable you can't account for and probably doesn't vary in a linear fashion.

You should be able to get a tire gauge at any convenience store. I'm sure it will be at most a quid.

When I bought may car I made sure it came with remote sensing pressure gauges on each tire. It turned out to be std equipment on the '08 Civic Si. That's a little strange for Honda. I even got power windows and door locks - I was like WTFOMGBBQ?

[jmcslob]

It's Tire not tyre

[erocker]

There's no way to determine by normal senses how much air is being released. Besides what has been mentioned, not all tire valves are equal. With your tires at 48psi, they aren't going to explode or anything. Best to pick up a tire guage. If it's bugging you too much release air for about three seconds, then get back to the service station.

It's Tire not tyre

I have tyres on my Mazda. Nokian's, best damn tyres made. On my truck I have tires. Coopers. Also good tires.

[Kurosagi]

I guess i should buy a pressure gauge soon,also in the UK we spell it as tyre not tire.

[DaMulta]

Kind of how you guys smoke on some fags in the old john?

Or

Kind of how the whole class room in schools uses rubbers every day?

[CyberDruid]

I have tyres on my Mazda. Nokian's, best damn tyres made. On my truck I have tires. Coopers. Also good tires.
That's odd I have tyres on my Triumph Bonneville...but I have tires on my Dodge RAM.

Either one will smoke a fag...leaving the light.

[WhiteLotus]

Kind of how you guys smoke on some fags in the old john?

Or

Kind of how the whole class room in schools uses rubbers every day?

Yes. Hey you butchered our language not us.

[CyberDruid]

SO you're saying Smoking a Fag is completely different than Puffing a Peter?

I learn something knew everyday.

[WhiteLotus]

Yes. That is what i'm saying.

[CyberDruid]

I'm good with that.

[Magibeg]

Honestly guys, a tire/tyre/tieher thread. Just buy a $30 pump that has a built-in pressure gauge and call it a day. Leave it in your trunk in case of any what if situations. I thought this sorta thing was standard equipment.

[WhiteLotus]

I'm good with that.

I'm glad.

[Polaris573]

I have tyres on my Mazda. Nokian's, best damn tyres made. On my truck I have tires. Coopers. Also good tires.

Reading that makes me tired.

[JC316]

Reading that makes me tired.

Makes me tyred.

[1Kurgan1]

Honestly guys, a tire/tyre/tieher thread. Just buy a $30 pump that has a built-in pressure gauge and call it a day. Leave it in your trunk in case of any what if situations. I thought this sorta thing was standard equipment.

Those rarely can get tires up to the manufacturer's recommended PSI, those are mostly good for 25psi, enough to pump you up and get you to a real air pump.

[CyberDruid]

Those rarely can get tires up to the manufacturer's recommended PSI, those are mostly good for 25psi, enough to pump you up and get you to a real air pump.
Before the tire got
http://img257.imageshack.us/img257/5350/davidcarusocsimiami.jpg
Pumped



Sounds like that pump got
http://img714.imageshack.us/img714/6629/csimiamiv.jpg
Tired

[1Kurgan1]

I would say more like, "It's time to pump.... you up!"
http://3.bp.blogspot.com/_KW_sl4dWvkc/RioxOgaUolI/AAAAAAAAAFo/XKYb5KgX5cI/s400/arnold-schwarzenegger-big.jpg

[twilyth]

Those rarely can get tires up to the manufacturer's recommended PSI, those are mostly good for 25psi, enough to pump you up and get you to a real air pump.

I got one of those all-in-one jobs from Sam's Club several years ago. I think it does 600+ cold cranking amps, has a decent air pump and 100 or 200 watt power inverter. I check it every couple of months to see how the charge is holding and a few times a year I have to bring it in to top it off.

anyway, the pump does take a couple minutes to add 5 or so lbs of pressure but it does the job. The old pump I had took much longer. You had to have some bonage and tunage lined up for entertainment first.

[@RaXxaa@]

if iam not too late
for a car i would recommend draw the pressure out of the tyre until you see the sidewall start going out barely... if it goes out a bit you will be at say 20-25 psi really but it also depends on weight and kinda vehicle, for a say midsize 4dr car you wil have around 25 almost if the sidewall is not straight

[Bundy]

if iam not too late
for a car i would recommend draw the pressure out of the tyre until you see the sidewall start going out barely... if it goes out a bit you will be at say 20-25 psi really but it also depends on weight and kinda vehicle, for a say midsize 4dr car you wil have around 25 almost if the sidewall is not straight

That depends on the tyre. On mine, I can drive with the tyre totally flat because the sidewall is only about 40mm high.

[twilyth]

That depends on the tyre. On mine, I can drive with the tyre totally flat because the sidewall is only about 40mm high.

That's a good point I hadn't considered. Low-profile tires are going to respond differently than tires with a more normal aspect ratio.

[CyberDruid]

Low profile tires get more pussy.

[@RaXxaa@]

but hey i am talking about normal orignal or basic tyres and again its temporary not saying that he has got aftermarket slich low pro or something :p

[Magibeg]

Those rarely can get tires up to the manufacturer's recommended PSI, those are mostly good for 25psi, enough to pump you up and get you to a real air pump.

The one i have does to 120 PSI. Depending on the starting pressure takes an average of about 15 seconds per PSI from 20 to 30.

[1Kurgan1]

The one i have does to 120 PSI. Depending on the starting pressure takes an average of about 15 seconds per PSI from 20 to 30.

They maybe rated that high, but like you said 15 seconds for each PSI after 20, thats 150 seconds for 20 - 30, and it keeps getting slower. I've seen a few almost hit 40 psi, but it took forever.

[Magibeg]

They maybe rated that high, but like you said 15 seconds for each PSI after 20, thats 150 seconds for 20 - 30, and it keeps getting slower. I've seen a few almost hit 40 psi, but it took forever.

I'm not sure what the real limit is, but it didn't take terribly long to put my spare tire to 60 PSI. It actually gets faster as the PSI increases (less air is required to increase the pressure as the pressure increases). Maybe you guys all need a Canadian Tire ;)

It actually takes significantly longer pumping a tire from 0-20psi than to 20-60psi (with my particular pump).

[twilyth]

The max ratings will give you a better idea of how fast the pump is. The one on my jumper batter/voltage inverter is rated at 200psi and is much faster than the one I used to have that was rated for 120psi