How often u guys fill the tires air?
 

so today my car's tire pressure light goes on.
And I only have it for 3 months.

I might take it to the dealer to check later after my work.

Is this normal?
How often u guys fill the tires air?
:)

Very rarely, maybe once a month? Maybe they put it to 32 PSI instead of 35 PSI.

I never did lol

yea, I never did it on my old cars too.
But now the brz's air pressure light goes on, and only three months.

this makes me feel worry about the tires.
Hopefully not anything happen to the tires.
>.<

Maybe check for a nail

No need for a dealer trip, buy a gauge for a couple bucks at an autoparts store and fill 'em up at the next gas station stop, check in a week or two, if they're dropping pressure quicker than that then go to the dealership. Unless of course you enjoy going to a dealership service department to have them fill your tires up with air, is that complimentary? I can't even guess.

Also remember that tire pressure can vary with temperature, you can fill 'em all up even to 35 psi in the morning, leave it parked in such a way that the sun is only on the left side, go to check and find the right sides are still around 35 while the lefts have jumped up to 38-40. Tires that were inflated well in the afternoon during an Indian Summer can drop pressure when the first frost hits triggering the warning light. (Probably not a scenario you'll experience unless you go up to play in the snow)

Thank you.
I still go to dealer for a check since it is near my workplace.
Hopefully that because of the temperature.

LA was too hot this few days.

Good to hear. I'm in LA and got the light this morning too.

Same thing happened to me this morning. My TPMS light came on. I put another 3 lbs of air in each tire. TPMS went off after about 3 minutes. It's most likely temperature related. In So Cal we had also been going through a horrible heatwave (95-100 F temps). Expanded the air in the tires. Today is a full 10 degrees F cooler from yesterday contracting the air in the tires. Our heatwave has finally subsided.

The stock tires are rated at 50lbs psi max. That being said and the car being light, I raised mine to 40 and I like the way they grip better and the way the car drives better. Not much difference in roughness either.
You can tune your front to rear bias by putting less air in the back for a more tail happy car. I do this....makes the rear come around in a corner more like I want....

I put about 24k miles a year on mine and do check tire pressure regularly until about last year when I find it moot as it's always good.

Then last week, the light came on after a refueling stop in the morning. I ignored it as usual as it's always been a non-issue with other cars other than 1-2 psi lower. Not in the case as by lunchtime, I had a almost flat tire. There was sufficient air to drive across the street to America's Tire. I must have picked up the screw in the morning.

as needed?

The light turns on for me during the winter in the morning, but turns off once it gets warmer. Could that be the same for you?

Mine is turning on in the morning at low to mid 50s. It turns off when I leave work when its 70s.

you guys should all check your tires once a month, especially when it starts to get cold. And, get a good digital gauge and your own electric tire air pump. I noticed that the light comes on at 28 psi.

Maybe they enjoy watching the light go on and off as well as uneven tire wear.

lol.
the light goes off now.
really its the temp difference.

If you are getting a TPMS light from air temperature change, your tires are probably borderline. I would check them and add air. I never have to add air with the BRZ because I switch out from winter tires to summer tires and back seasonally, but with the all seasons on my Genesis I would only see the light when it started to get cold. I usually had to add air once temps hit about 40* and then again when they hit about 25*.

You shouldn't have to add air at all frequently unless there's a problem with the tyre or a very noticeable temperature change. You should buy a gauge and measure the pressures when you stop for fuel, though (at least once a week). Then if they're off at all, you can just adjust them at the gas station before you leave.

Also, it's important not to rely on the TPMS light, because handling can be significantly affected well before the light triggers. Over- or under-inflating your tyres can significantly change the amount of grip available, as well as cause your tyres to wear unevenly, causing you to have to discard them early. Also it can hurt gas mileage. It's a much better idea to just spend the few bucks + two minutes at gas stops to make sure they're right.

You sure you didn't get that backwards?

He isn't, but everyone else is.

What I'm saying is that it's been my experience that these tires are under inflated at 35 pounds. And I believe I get better traction and more predictable handling with the front at 40 and the rear lower, about 36.

I may be imagining it! I understand that too much air is less traction....But so is not enough. And if these guys are driving around at 26-28 lbs, I'm thinking they're riding on the sidewalls of their tires.

I don't know - I might be willing to believe that. My Cayman understeers like mad at factory pressures (32 front, 39 rear), but if I change it to ~38 all around (higher front and slightly lower rear than stock), it is a lot more balanced and has way better front grip. Lower pressure isn't always better for grip.

One way to know for sure: chalk the tyres and go driving / experimenting until they look right.

These are prius tires and the prius only weights a few hundred pounds more than BRZ. The factory settings is 36 PSI if I remember right. I would not go to 40 lbs and over inflate your tires...it's going to put extra wear on the center of the tire. It's your car and your safety, but I would not go over factory limits of the tire manufacturer. 40 PSI cold plus temperature changes on top of any other impact (I'm no expert) but seems like a bad formula to me. Why cause premature wear and potential tire blow out or separation?

I inflate my tires about every 3 months or so with regular air.

Are you related to suberman?

Yeah probably heat related, I'm another la guy that had the light go on a few days ago

I only check when I swap out the stocks for winter and vice versa. No issues with the light so far.

-_- the light goes on again this morning.
really need to buy a gauge

If you don't want/are too lazy/are too cheap to buy a gauge, just look for a pump that has a digital gauge built in. You can dial in the pressure you want and it will fill and shut off automatically.

I check once a week.

The max psi on the stock Michelin Primacy HP is 51 PSI! You will never get your tires hot enough in normal driving at 40 PSI to aproach that.

Again. This is just my experience. And I've only driven the car 6K miles. So don't beat me up for sharing.

Why? Because you don't like what I wrote? It's just my experience with this BRAND NEW car! I could be wrong, like I've said...But it's just what seems to be working for me right now...Don't get your panties too bunched over it! Geez!


(I have found sites that agree with me and sites that don't. Seems it's a car by car and tire by tire thing.) But here's an easy one to read:

http://www.execstudio.com/tech_suspe...understeer.htm

My light went on when the temperature dropped 15 degrees. So much for nitrogen being more stable.

I've been too lazy to check, but they feel fine pressing on the sidewall. Like feeling doneness of a steak, can't be too inaccurate :D

Everybody should have a basic inexpensive tire pressure gauge. Just keep it in the glove box and check every time you get gas. But maybe I'm just anal.

bought one and all tires were around 30psi....
now filled up to 34.....
feeling more smooth when driving

All I asked was if you were related to suberman..... the irony.

Checked once a week minimum & adjusted as needed. Sometimes I go for weeks without adjustment other times it's every time I check the tyres for a month.


I think I understand what’s happening here with @MGPAX. When putting 40psi all round you’ll effectively be making the front suspension setup stiffer relative to the rear. As we know a soft front & stiff rear setup causes oversteer, we can assume that’s what the IP is feeling. Adding a little more understeer may give the impression of better traction by small amounts of slip under throttle balance the car to being neutral rather than oversteer. With this in mind I’d say try stock pressure then reduce the rear pressure by 1psi & if that doesn’t have the desired effect then increase the front 0.5-1psi.

Yeah max is 51 PSI...doesn't mean they want you to run up there. 40 PSI cold and in hot weather it'll expand to another 2 to 3 PSI. So you are now closer and then u got 2 adults and maybe stuff in the trunk and such... just saying for your safety...but again it's your car and such. Not picking a fight with you. If the manufacturer wants u to max put 36 PSI...they are doing for legal reasons and best be safe. I don't see many car tires on any application that goes up to 40 PSI.

In my old Z4M, I think I remember going up to 38 PSI in the back before, but it was a staggered set up on Z rated tires... I think I went down to 36, but it was within factory spec +/- 2 PSI...not +5 PSI that you are doing.

I would say though...40 PSI...your center tread will wear faster than the corners...unless you are rough with the turns.

I say it is anal...because you do have TPMS on these cars. Unless you get a slow leak from a screw...it's not going to change much unless you're the type of person that wants a specific PSI per tire weekly or so to ensure better gas mileage

Nothing wrong with it though :)