Tire pressure - would you use 3psi more than spec since the car is warmed up?


#1

My 2000 Acura Integra has 32/30psi (rear) spec.

Car was driven and the mechanic said 3psi above since the spec is for cold air.

I went with him and it used to be a bit bumpy at 35psi but not today.

What do you all do?


#2

. I think it’s a flip of the coin. Personally, if I were the only person to ride in the car 90% of the time 32 works for me. When my wife takes a loaded car, I make sure it’s at 35 lbs. I would say, stay with 32 lbs and add pressure as needed for loads.


#3

I always keep mine a little higher in warm or cold temps. No more then 5lbs though. 3 is about right. Mine are suppose to be 32…I set it to 35.


#4

I find if the tires are a little overinflated, they will leak down to the recommended pressure by the time I check again. This seems to improve gas mileage vs. starting at 32 psi and dropping to 29 or so when I fill again.


#5

The mechanic can’t come to your house and inflate the tires when they are cold so he must compensate/estimate the warm fill pressure to achieve your 32/30 cold specification.

Check your tires when cold and see if they are closer to 32 PSI than 35.


#6

I always add 2-3 lb to cold tire pressures if filling them after car has been driver at least 7 miles.


#7

Yeah I put a few pounds more in depending on the time of year. I adjusted mine already for winter but the car sits in the garage at about 40-50 degrees. Yesterday when it was out all day in zero weather, I noticed it easily lost one to two pounds due to the temp. So they could use another pound or two.


#8

Add me to the list of 2-3 over. I check the pressure in my garage and have a foot pump that gives me good workout. I am in South CA, so the lowest temp outside is 32. When I was in CT, we didn’t have a garage so still would do 2-3 above.


#9

2-3 above is perfectly fine. Don’t overthink it.


#10

More blowouts are caused by under inflated tires vs overinflated tires. Now in my book I would rather error on the high side than the low side, but a tire pressure gauge is a good tool for you. Check it cold and see how close it is.


#11

Or you could use nitrogen and never have to worry about air pressure again.


#12

Now Dag, you need to put a :wink: with a comment like that…


#13

@dagosa I got free nitrogen with my last tires, caps are green, are you saying nitrogen filled tires at all temps are the same?


#14

Nope, he’s joking.


#15

@Barkydog: So THAT’S what those green caps mean! Never knew that.


#16

@nybo as far as I now that is the explanation, so now all the cartalk guys can look and say jees what an idiot paying for nitrogen, I was thinking I may need a bumper sticker, I got the nitrogen for free so…


#17

Thanks all

It turned out to be at about 27psi before inflation - which had made turning the steering harder too. Now its very easy.

I am very meticulous - not sure how I let it drop to 27psi - believe the cold weather took 3psi.


#18

@texases " you need to put a :slight_smile:

What? And be so obvious. How else can we stir the pot ? Besides, nitrogen is like…magic. A man with a little green hat riding a city cycle with a compressor checks the pressure of all cars with little green caps while the owners are at work…it comes with the nitrogen warranty.


#19

Oh no, not the nitrogen debate again… :slight_smile:


#20

The last time someone offered to fill my tires with nitrogen (for a fee naturally), I mentioned that the air we breathe is already 78% nitrogen, so just how much good would the extra 22% do me? I was met with a blank stare as though I’d lapsed into Swahili.