Correct tire pressure
02-07-24 | 04:31 AM
#16
Pit Crew
Joined: Feb 2012
Posts: 167
Likes: 49
From: NC
I stick with 33; personally, not a fan of a slightly harsher ride. My 2018 is firm (harsh?) enough, and more tire pressure doesn’t help traction (although it might seem to improve steering response).
Speaking of tire pressure. I’ve had my LC for just over a year, through the heat of summer and the depths of winter here in Vermont. Ordinary with a big temperature drop you would expect to see a reduction in tire pressure (checked cold). Haven’t seen it here.
This car came to me from Palm Springs, Cal., and was low-mileage and beautifully maintained. So it’s possible the tires are filled with nitrogen, which would account for the pressure stability. Anybody know anything about using nitrogen in street tires? I know it’s used in racing applications.
Speaking of tire pressure. I’ve had my LC for just over a year, through the heat of summer and the depths of winter here in Vermont. Ordinary with a big temperature drop you would expect to see a reduction in tire pressure (checked cold). Haven’t seen it here.
This car came to me from Palm Springs, Cal., and was low-mileage and beautifully maintained. So it’s possible the tires are filled with nitrogen, which would account for the pressure stability. Anybody know anything about using nitrogen in street tires? I know it’s used in racing applications.
02-28-24 | 04:26 PM
#17
Rookie
Joined: Mar 2023
Posts: 30
Likes: 5
From: NY
And, regardless of ambient temperature, just sun radiation vs. shade is 2-3 PSI difference. My GX is parked outside. Before noon the left side of the car gets more sun than the left side. If I go to drive it and immediately check pressure, the left 2 tires are 2-3 PSI higher than the right tires- even at same ambient temperature.
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fodalo (02-28-24)
09-11-24 | 10:32 AM
#18
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Joined: May 2024
Posts: 32
Likes: 5
Have summer tires on a 2024 IS350 and now that we are in the cooler months, TP is at 29-30 PSI cold.
They are supposedly nitrogen filled. TPI varies 2-3 lbs over time and ride, so not sure Nitro is adding any value.
Looking at taking it to the dealer for a fill. Assume they will go to 30-31 PSI when I get there.
Should I say, fill them to 35 to compensate to get to 33 COLD. The indoor label on TP says 35 cold.
TIA,
They are supposedly nitrogen filled. TPI varies 2-3 lbs over time and ride, so not sure Nitro is adding any value.
Looking at taking it to the dealer for a fill. Assume they will go to 30-31 PSI when I get there.
Should I say, fill them to 35 to compensate to get to 33 COLD. The indoor label on TP says 35 cold.
TIA,
09-11-24 | 12:30 PM
#19
Intermediate
Joined: Apr 2020
Posts: 486
Likes: 193
From: hi
the only way to know is to check the cold psi reading. keep in mind, tire pressure readings are
subject to the effect of elevation, air temperature, air density, the accuracy of the measuring device,
(ie, range of error ) the accuracy of the measurer ( repeatability) and the accuracy of the vehicle's TPMS
(displayed in lbs, so 30 psi is ~ 29.5to30.5) which all means a reading of a pound or two either way.
the subject of how it feels is up to you: less air means more patch contact, and more air means less.
subject to the effect of elevation, air temperature, air density, the accuracy of the measuring device,
(ie, range of error ) the accuracy of the measurer ( repeatability) and the accuracy of the vehicle's TPMS
(displayed in lbs, so 30 psi is ~ 29.5to30.5) which all means a reading of a pound or two either way.
the subject of how it feels is up to you: less air means more patch contact, and more air means less.
09-11-24 | 02:12 PM
#20
Rookie
Joined: May 2024
Posts: 32
Likes: 5
Thank you for the reply. My main concern is tire wear as I would like to get
the rated mileage or close, spec is 20k miles. Not a lot on these summer tires.
I find it interesting that at 29-30 PSI, the TPMS does not trip. Perhaps
it needs to get to 25 PSI, not sure of the trip point, but 25 PSI cannot
be nice to the tire LOL! The LEXUS phone app states at 29 PSI, tire
pressure is GOOD!
the rated mileage or close, spec is 20k miles. Not a lot on these summer tires.
I find it interesting that at 29-30 PSI, the TPMS does not trip. Perhaps
it needs to get to 25 PSI, not sure of the trip point, but 25 PSI cannot
be nice to the tire LOL! The LEXUS phone app states at 29 PSI, tire
pressure is GOOD!
09-16-24 | 11:41 AM
#22
Pit Crew
Joined: Nov 2017
Posts: 233
Likes: 63
From: Michigan
We always used Nitrogen in Aircraft tires for a couple of reasons; elimination of moisture causing corrosion, reduction of temperature variations (mostly due to altitudes) and it is a larger molecule so less chance of leaks. That said, unless I still had access to the Nitrogen bottles for use I wouldn’t pay extra for it. Most shops air compressors probably have moisture traps anyway. Running 33psi cold.
09-16-24 | 01:24 PM
#25
Pit Crew
Joined: Mar 2024
Posts: 114
Likes: 33
We always used Nitrogen in Aircraft tires for a couple of reasons; elimination of moisture causing corrosion, reduction of temperature variations (mostly due to altitudes) and it is a larger molecule so less chance of leaks. That said, unless I still had access to the Nitrogen bottles for use I wouldn’t pay extra for it. Most shops air compressors probably have moisture traps anyway. Running 33psi cold.
