Bridgestone Potenza "bubbles"
05-27-2000, 03:09 PM
#11
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Being shipped with low pressure is proibably normal. Driving much distance that way will do harm
<p>Jim De Arras
<a href="http://www.imola.org">2000 00 Imola/Onyx/Alcantera S4</a>
MTM Stage III on order
MTM Suspension on order
<a href="http://www.imola.org">2000 00 Imola/Onyx/Alcantera S4</a>
MTM Stage III on order
MTM Suspension on order
05-27-2000, 03:46 PM
#12
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yes
Because when you put 50psi in your tire, you aren't really putting 50psi in it, you are putting ambient plus 50psi in it (about 64).
If you put ambient plus 50 in at an altitude where ambient is 10psi, then drive down to sea level, your pressure is down to 46 plus ambient, and so reads as 46.
Unless they filled them in death valley or you are checking them in the mountains, they shouldn't become "overfilled" this way though.
Doesn't matter, your tires develop another 5psi through heating when you drive them. So being delivered 5 psi high is fine as long as you lower it before you drive.
If you put ambient plus 50 in at an altitude where ambient is 10psi, then drive down to sea level, your pressure is down to 46 plus ambient, and so reads as 46.
Unless they filled them in death valley or you are checking them in the mountains, they shouldn't become "overfilled" this way though.
Doesn't matter, your tires develop another 5psi through heating when you drive them. So being delivered 5 psi high is fine as long as you lower it before you drive.
05-27-2000, 10:56 PM
#13
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50psi is "half inflated"?!?!?!?
<p>Peter Y. Lee
Philadelphia, PA
96 M3 Lux (an S4 aficianado)
Remus exhaust, Brembo OE
slotteds, stainless steel lines,
JimC software & intake, H&R
w/ Bilstein, Hamann HM2 18"s,
S-02's, ERT underdrive pulley,
Ron Stygar SS, Racing Dynamics
su
Philadelphia, PA
96 M3 Lux (an S4 aficianado)
Remus exhaust, Brembo OE
slotteds, stainless steel lines,
JimC software & intake, H&R
w/ Bilstein, Hamann HM2 18"s,
S-02's, ERT underdrive pulley,
Ron Stygar SS, Racing Dynamics
su
05-28-2000, 06:37 PM
#14
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Actually... (more)
If you had to put ambient pressure in the tire then you are implying that the inside of the tire starts as a vacuum. For all intents and purposes a tire always has at least ambient pressure inside.
As you descend from altitude the increasing ambient air pressure compresses the tire, causing the pressure of the air in the tire to rise. As well, air temperature also rises as you descend. As the air in the tire warms up - as you pointed out, the pressure of the air increases.
If they flew the car in an unpressurized cargo hold around 30,000ft and filled it to about 38psi, the tires pressure would be around 50psi at sea level.
If they flew you your car I want to know what deal you got so I can get mine flown over too!<p>2001 S4
(scheduled arrival Sep)
6 spd
Santorin Blue
Silver Alcantara
As you descend from altitude the increasing ambient air pressure compresses the tire, causing the pressure of the air in the tire to rise. As well, air temperature also rises as you descend. As the air in the tire warms up - as you pointed out, the pressure of the air increases.
If they flew the car in an unpressurized cargo hold around 30,000ft and filled it to about 38psi, the tires pressure would be around 50psi at sea level.
If they flew you your car I want to know what deal you got so I can get mine flown over too!<p>2001 S4
(scheduled arrival Sep)
6 spd
Santorin Blue
Silver Alcantara
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