Just wanted to know if anyone is dealing with this tire pressure reading problem. At the start of the day the reading reads 35 psi but when you start driving it for awhile it shoots up to 4-6 psi which makes it 40 to 41 at times. Should i worry about it or just let it go?

 

As you drive the tires heat up and yes, the pressure rises. Also, as the day wears on, the ambient temperature also rises which increases your tire pressure. It's totally normal.

 

Hot air expands. Cold air contracts. Tire pressure will vary about 10 percent throughout the day. Its no big deal.

 

weather's going to make your psi fluctuate. .cold to hot. .hot to cold .when it's cold and the psi drops as u drive it should come back to normal after tires heat up. .although the damn light wont go out until it's reset IE. .restarting. . .Personally i keep my PSI at 32. .thats the best ride. .but since i live in NJ. .cold weather drops it to 27 on occasions and i gotta regulate. .if you go to high your gonna have a bumpy ride. .too low. .and you'll dent a rim ..32 is perfection ..and if your gonna disagree with me. .thats my Opinion. .im not here to beef about the damn tire psi. .
thanx!

 

^^32 psi is a little low (and outside specification for the Z). Obviously it works (you are using this psi), but that wouldn’t be a good starting point (cold measurement) in Frostbite Falls where ambient temperatures can often go to -25F.

--Spike

 

personally i don't go by z standards. .i go by tire specs. .but your right for me 32's worked nice so ima stick with it. .

 

You should use the specifications for your car.

The tire specifications for psi is meant to provide the tire's true measurement at its maximum load in a suspended (non-weighted state). This is typically way too high a psi that you would run with your car.

--Spike

 

Tire specs? Please enlighten us.

Since manufacturers make tires for all sizes and shapes and weights of cars, how could they publish pressure recommendations that cover all? Recommended pressures are determined by the manufacturers based on ride, handling, wear and other factors for that specific car. You're probably hurting your gas mileage and tire wear by running it under-pressured.

 

so spikes saying im way to high a 32 and david seems to think only god knows. .so here's the idea. .if my tire's max psi says 35-45 depending on style of tire and i put the max . .im going to be bouncing all over the damn road at that high of a psi. .so i put 32 even in all tires. .not only would i get a smooth ride, but i also get good traction and amazing gas mileage with 32. .if i go lower than 32 spike. .my tire psi warning goes on at about 27 psi. .so 27's too low. .and if i go higher than 32 i feel the diff in the ride. .i dont like to bounce around the road or be stiff while whipping the car. .if the tire recommendations are around 29-35 for most cars. .SUV's and TRUCKS are diff. .35 may be to ruff of a ride and 29's too low. .so at 32 you get a smooth soft ride. . .

 

I run 35-40 psi on my Falken Azenis rt615

 

On my general exclaims I run 36

 

You could get your tires filled with nitrogen... they'll run cooler and with less pressure variation.

 

yeah im on the verge of buying a nitrogen air pump machine from my snap on dealer. .

 

Not true… I said 32 psi is a little (very slightly though) low. And, I agree with Dave that you should use the suggested psi for your car (which is always less than the unsuspended and maximum psi the tire manufacturer provides in the tire specifications).

For your Z, you should run 35-36 psi. If you like 32 psi, then go with that; but realize you might see a low pressure warning from your Z’s TPMS if ambient temps suddenly drops.

Of course, if you are vigilant measuring your cold tire psi values, you probably won’t encounter a problem with too low pressures, even when running 32 psi cold.

And… if you like the softer ride with 32 psi, why not go with a tire that has softer sidewalls? That way you can run with the suggested 35-36 psi (while getting the softer ride you prefer) and not worry as much balancing the lower 32 psi value you are using with too low a tire pressure when the ambient temperatures drops significantly.

--Spike

 

lets just say the final outcome is. .to each their own. .

 

Agreed.

--Spike

 

You are welcome.

 

That 1 to 2 psi difference isnt worth it unless your racing your car.

 

True… unless you live in Frostbite Falls where the ambient temperature went from 42 F to -10 F within a few days.

Nitrogen fills works great here (the larger molecule won’t leak as easily making tire pressure monitoring/maintenance much easier).

--Spike

 

Larger molecule, but proven to leak out faster. We tipinally have a 40 degree swing here in Vegas, no nitrogen needed.