cant seem to find my manual but i was wondering what the tire pressure should be for the stock bridgestone tires

 

35psi

 

yup 35, check the driver side door, it says on there.

 

You can look at the side of the wheel....From there determine how much you should use based on your driving. I use 35. As the tires get hot it gets close to 40psi. But 35-40 is the way to go. I always subtract 5-10 psi from what the max is.

 

If the Z is at a place that has a yearlong very hot climate, putting 35 is also applicable?

 

The climate doesn't matter.

If you have the stock tires, the pressure should be set at 35psi before your drive anywhere (when the tires are "cold"). Any increase in pressure during driving (due to temperature) is taken into account by the tire manufacturer. It may go up as much as 5-6 pounds during driving, but that's OK.

35psi also assumes that the weight ratings for your tires are correct (91W up front and 96W on the rear).

All best,
Joe

 

You are correct. But the climate does make a difference. The temperature does affect the tire pressure. Cold weather decreases pressure and hot air increases pressure. In very hot rural areas people usually let a 2-3 psi out of the tires because the hot atmosphere will increase the pressure.

Yes, climate/temperature, daily driving, driving at higher than average speeds, and the weight in the car will also make a difference in the pressure. But we never really pay any attention to that. 35psi is about average. Daily driving can take the 35psi pressure to near 40psi. If you added 40psi to cold tires, driving can bring it to 45psi and that is max. That is how people get blow-outs.

Anyway, 35psi is the best for everyday driving and most weather. It is not to low and yet not to high.

 

Now this is blatently wrong.

Most blow-outs are due to starting with tire pressures that are TOO LOW, causing the sidewalls to flex more than normal, which causes them to overheat and eventually fail.

You'll have many more problems with tire pressures that are too low, than you'll ever have with tire pressures that are too high.

 

Yes, you can get a blow out from low tire pressure. You can also get a blow out from to much tire pressure.

That is why 35psi is the best. Its not to high and its not to low. Works great in most coniditions.

Yes, you are correct.

 

As Dr. Gonzo always says, rental cars handle best and if you want it to handle like a Lotus just have the gas station boy fill the tires to 100 PSI. Try to avoid standing too close when he does this, tell him they are experimental units from the Sandoz company. Just kidding.

 

Lol

 

Kinda of related question for you all. If I change the tires to a different non-OEM brand how do I know what tire pressure to set them to? Or is it the same regardless of the tire? I'm thinking of getting goodyear eagle f1 GS or whatever.

- Chad

 

Subtract 10psi from what the max is on the side of the tire. If you look on the side it will tell you the max psi. The stock tires are 45psi max. My rule of thumb is always subtract 10 from the max that is labeled on the side.

 

Assuming you're staying with OEM trie size, yes 35psi will always apply.

There is room for some flexibility here. Use 35 as a base line and adjust +/- according to your preference.

And plz, NEVER base your tire's inflation pressure on the maximum rating molded on your tire. That is the maximum safe "morning-cold" pressure the tire will take and has nothing to do with the car's suspension settings.

As for running lower pressure when it's hot, I fail to see any sort of wisdom/logic in that. Blow outs happen when the tire overheats from the inside. Less pressure will generate more flex and thus more heat. Unless you're running R-compounds that are comfortable at 160-180F (which I doubt) you should stick to the "35psi in the morning" rule.

 

This is wrong on so many levels. The tire pressure on the sidewall is the maximum pressure as determined by the tire maker. The correct pressure for your car is determined by the car maker. The correct pressure for your car is the same no matter what brand of tire you use. The only thing that can change the correct pressure for your car would be if you changed your tire size. The best way to determine the proper inflation for your new tire size is to mark your sidewall and a little bit of tread with chalk and then drive around normally. If your wear the chalk off the sidewall at all, you need more air. If there's still some chalk on the tread, you need less air.

 

Good to know - I'd have set the pressure all wrong

- Chad