How often u guys fill the tires air?

[clfan]

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

[Annahra]

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.

[RobertPaulson]

I check once a week.

[MGPAX]

Originally Posted by imom

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.

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.

[MGPAX]

Originally Posted by s2d4

Are you related to suberman?

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

[kberkel]

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

[tyrantcf]

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.

[clfan]

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

[s2d4]

Originally Posted by MGPAX

Don't get your panties too bunched over it! Geez!

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

[stonenewt]

Originally Posted by clfan

How often u guys fill the tires air?

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.

[imom]

Originally Posted by MGPAX

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.

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.

[imom]

Originally Posted by tyrantcf

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.

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

[stonenewt]

Originally Posted by imom

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

Hum... according to the instructions I have (not for Subaru)

The tyre pressure monitoring system should not replace checking tyres regularly with a quality tyre pressure gauge.

Check tyre pressure regularly and adjust as necessary, but at least twice per month and before any long journey. Incorrect tyre pressures can adversely affect the car's road holding and cause tyre damage, which could result in an accident.

After correcting the tyre pressure:
> Confirm tyre pressures on the tyre condition screen
> Re-initialise the run flat indicator

The TPMS system needs to be reinitialised because it sets its minimum warning pressure depending on what pressure was in the car when initialise. Considering there's a 0.6 bar variation on the door sticker depending on tyre & car load this is a rather critical thing to do.

[MGPAX]

Originally Posted by stonenewt

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.

I understand slip angle etc. What I am saying is that I don't think this tire gives you full contact patch and the best and most consistant performance at the recommended 35 psi. agreed...40 psi is probably high. But i'm getting 3 psi a month loss in pressure. And I get a couple extra MPG out of it with more pressure.

I'm gonna try your suggestion. As well as reversing what I'm doing. It's all in the name of fun anyway.
Thanks for your input.