hello humans,

my OCD is easily triggered by the almost constant fluctuation in PSI of my tires.

just wanted to ask the brain trust here ... what kind of deviance is acceptable to you for your tires ?? +-3 psi?

do any of you use NO ?

 

+/- 3 is what I expect, and I live in a mild climate without too much temp changes. But after driving on a hot day, +3 psi is easy and pretty consistent.

 

Was laughing reading your post. 3/4 tires today had a different pressure. 2 at 39, 1 at 38 and 1 at 37 after 25 mins of driving.

As soon as I got home, I leveled them off after the car cooled down. LOL.

Its not just you with OCD.

 

PSI can fluctuate even more depending on ambient temp and driving conditions.
3 PSI isn't much, you could even climb to 5 PSI under the right conditions.
If you switch to nitrogen that will help with the fluctuation and natural air loss through the sidewalls.

 

If I switch to nitrogen, what what would I obsess over when driving? Plus I don’t have a nitrogen tank to add to them when needed. :-)

 

why are you obsessing over it, the system will warn you when you are out of tolerance.

 

If you filled them with nitrogen, then likely you wouldn't need to add any air for a long time...like a year or more at least. I wouldn't worry about having to add, that's the whole point of nitrogen.

 

It was a joke. I know how the system works.

 

My rule of thumb was always to keep it at or above 35 PSI cold, no more than 37. But, I am OCD about stuff like this.

Now that I have a car without an actual readout of pressures, I worry about it less. I just check every couple of weeks.

 

I just basically set my tires to 38PSI all the way around and wait 6 months, rinse and repeat.

I found if my tires get too hot and my cold pressure is at 40 PSI, I get an alert from the TPMS. I don't know if it's the same with the IS. I don't see why not.

 

Tire pressures should be set / checked once a month...

This will yield more consistent tire wear and mpg

Also for every 10 degrees + or - in ambient air temp, it can change the tire pressure by 1 psi.

Joe Z

 

I fill mine to 37 front & 35 rear cold (manual says 36 all around, whatever, I'm a rebel). They usually go up about 3-5psi while driving, fronts more than rear, and more-so if I'm pushing it, or if it's hot out. I use it as an indicator to me that my tires are up to temperature so I can trust them while pushing the car. Based on my cold pressure reading in the morning I make a decision as to whether or not I need to add air.

 

I fill mine all to 37 when cold, since that is exactly what the door sticker says to do.

 

I have PSI set to 36 all around and after driving for a while on a hot day they settle around 40-41 max.

I had my tires filled up with nitrogen previously and although it is advertised that PSI will fluctuate less, I found that pressure still increased to the same 40-41 after driving around on a warm day. The thing that I liked about the nitrogen was that you do not lose as much air naturally over time and PSI did fluctuate much less during cold temperatures.