[s-cars] Tire Pressures

[Mark Strangways]

I have nitrogen not hydrogen, and I like my tire to be no flammable :)

Mark
----- Original Message ----- 
From: "Gabriel Caldwell" <gabriel at ts.bc.ca>
To: "Mark Strangways" <strangconst at rogers.com>; <mlped at qwest.net>;
<kirby.a.smith at verizon.net>; "Bill Clancy" <clancybill at yahoo.com>
Cc: <s-car-list at audifans.com>; <NDoshi at aol.com>
Sent: Wednesday, May 19, 2004 7:09 PM
Subject: RE: [s-cars] Tire Pressures


Hydrogen is the proper tire filler.

Gabriel Caldwell


-----Original Message-----
From: Mark Strangways [mailto:strangconst at rogers.com]
Sent: May 19, 2004 4:06 PM
To: mlped at qwest.net; kirby.a.smith at verizon.net; 'Bill Clancy'
Cc: s-car-list at audifans.com; NDoshi at aol.com
Subject: Re: [s-cars] Tire Pressures

That's why I use nitrogen to fill  my tires, does not fluctuate with
temperature.

Mark S
----- Original Message ----- 
From: "mlp5" <mlped at qwest.net>
To: <kirby.a.smith at verizon.net>; "'Bill Clancy'" <clancybill at yahoo.com>
Cc: <NDoshi at aol.com>; <s-car-list at audifans.com>
Sent: Wednesday, May 19, 2004 11:24 AM
Subject: RE: [s-cars] Tire Pressures


As a for instance:  "....Keep in mind that recommended inflation pressure
are for cold tires. This means tires that have not been driven on for
several hours (ideally overnight). It also means tires that are at a normal
outside temperature of about 70° F.

To accurately inflate a tire, you have to compensate for changes in
temperature. For every 10° F change in ambient temperature, tire pressure
will change a little more than half a pound.

A tire that contains 32 psi of air at 70° F will have a little over 35 psi
at 100° F - even if the vehicle hasn't been driven. Take a quick drive down
the freeway and heat up the tires even more, and the pressure may read 38 to
40 psi.

Likewise, when seasons change and temperatures drop, tires lose pressure.
They haven't lost any air, but the air isn't exerting as much pressure as
before. The same tire that held 32 psi at 70° F will have only about 28 psi
when the thermometer hits 32° F. And when temperatures are in the subzero
range, the loss in air pressure will be several pounds more.

Altitude will also affect tire pressure. For every 1,000 feet in elevation
above sea level, atmospheric pressure decreases about a half a pound. As a
result, tire pressure goes up an equal amount. A tire gauge that reads
accurately at sea level will read about 3 psi too high at an elevation of
6,000 feet....."  from
http://members.aol.com/carleyware/library/tirepres.htm

So again Bill, how many variables are your 34-36 feels too slippery, 28-31
too muddy, experimentation taking into account?

mike

PS - oh, and last but not least from the above link, "... make sure you use
an accurate pressure gauge. Gauges are often out of calibration, so either
get them recalibrated, or help your customers by getting new gauges...."
Damn, nothing's easy any more .... except perhaps that humming noise coming
out of the rear of Bob Frizzel's S4  :-)

>-----Original Message-----
>From: s-car On Behalf Of Kirby Smith

>I don't think you would find Bridgestone SO-2s slippery at 36
>psi.  I run mine around 38 psi, and the tread edges still wear
>faster than the tread center.  Optimal tire pressure will
>depend on tread construction and section height, not to
>mention driving style, camber, etc.
>
>kirby

>Bill Clancy wrote:
>>
>> Has anyone done any trial and error?   I did and I ended up
>with 32 psi on
>> my stock 16x8's.    with 34-36 the car feels slippery on the highway.
>> 28-31 and it feels muddy -- not to mention that I am sure it would
>> wreck the tires.
>>
>> I have no experience with 17's but i did spend a fair amount of time
>> fine tuning the pressure with the 16's.


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