Why is it that the 2024 manual and door jam sticker note the correct tire pressure at 33 psi but dealerships believe and adjust to 36 or 37 both front and back. What is your opinion on what the ideal psi should be for long road trips?

 

I can only tell you what I set mine at - 37 - 38 lbs pressure. I prefer a little harsher ride with good handling.

 

I would think higher PSI would be less handling dynamic, compared to lower PSI as more contact patch. Typically a slightly higher PSI nets you some improved MPGs but not handling, light trade off.

 

^^^^OK I said what works for me I'm talking about a 4/5 lb increase over the recommended 33PSI or a little over 1%. In a redial tire. This is not over inflation. My PS4S are rated to 50 PSI. Over the course of my driving experience I have found that a bit more pressure than specified by manufacturers for the average joe, works best for me. And again, in a radial tire, contact patch would remain the same with a small pressure increase.

And in normal driving PSI increase by 5 or 6 PSI, more on very hot days - just sayin'

 

No doubt, I'm not disagreeing with you nor saying that it is overinflated, most of my vehicles I "over"inflate about 2-3 PSI above factory spec as is, I was just saying that typically decreased tire pressure results in a bit better handling while a slight drop in MPG relatively speaking.

For my LC I run I think 32PSI which I come to think of it, rather would like to bump them up come this spring/summer.

 

If you want to know what is needed to laws of nature, you need to know 99% acurately the loads on seperate tires, but axleweightswill do.
Then needed pressure is also related to the maximum speed, you wont go over for even a minute.

Main goal of pressure determination is to give the tire a deflection, so heatproduction per cycle, that wont overheat any part of tire-material.

Carmakers calculate recomended pressure for GAWR's and max technical carspeed,with no reserve.

In the garage they yust use a " one pressure fits all" policy.

As " pigheaded Dutch selfdeclared tyrepressure specialist" , I can help you determining needed pressure to laws of nature.

Can make a cold pressure/axleloadcapacity - list for your tires if you give me next, read from sidewall.
1. Maximum load or loadindex
2. Kind if tire to determine the reference-pressure
Standard load AT 36 or 35 psi.
XL/reinforced /extraload AT 42 or 41 psi.
On sidewall only maximum allowed cold pressure is given, of between 44 and 51 psi.
3. Speedcode, less important, Q and above maxload is given for 160kmph/99mph.

Then you only have to determine the axleloads in your use 99% accurate, and look them back in my list. The most tricky part in it all, and your responcibility.

Standard, I make list giving 90% of calculated axleload capacity for max 160kmph/99mph.
Determined that to give maximum reserve, with still acceptable comfort and gripp.

But if you have other ideas about it, write it.
Also if you want it for higher speed.
Also give if you want list in,
Psi or Bar/kPA
Kg or LBS
And eventual other reserve build in.

You need the reserve for next.
Inacurate reading of pressure, and pressure loss in time.
Unequal weight R/L on the axle.
A little misyudging of weight
Can be you determine for max reserve, but because of all the factors, you end up with only yust enaugh to prevent overheating of tire-material, wich is only allowed " ZERO" times in tires use, and can lead to tire-failure, mayby after 2 years, when beginning internal cracks have build up enaugh.

 

If you want to know what is needed to laws of nature, you need to know 99% acurately the loads on seperate tires, but axleweightswill do.
Then needed pressure is also related to the maximum speed, you wont go over for even a minute.

Main goal of pressure determination is to give the tire a deflection, so heatproduction per cycle, that wont overheat any part of tire-material.

Carmakers calculate recomended pressure for GAWR's and max technical carspeed,with no reserve.

In the garage they yust use a " one pressure fits all" policy.

As " pigheaded Dutch selfdeclared tyrepressure specialist" , I can help you determining needed pressure to laws of nature.

Can make a cold pressure/axleloadcapacity - list for your tires if you give me next, read from sidewall.
1. Maximum load or loadindex
2. Kind if tire to determine the reference-pressure
Standard load AT 36 or 35 psi.
XL/reinforced /extraload AT 42 or 41 psi.
On sidewall only maximum allowed cold pressure is given, of between 44 and 51 psi.
3. Speedcode, less important, Q and above maxload is given for 160kmph/99mph.

Then you only have to determine the axleloads in your use 99% accurate, and look them back in my list. The most tricky part in it all, and your responcibility.

Standard, I make list giving 90% of calculated axleload capacity for max 160kmph/99mph.
Determined that to give maximum reserve, with still acceptable comfort and gripp.

But if you have other ideas about it, write it.
Also if you want it for higher speed.
Also give if you want list in,
Psi or Bar/kPA
Kg or LBS
And eventual other reserve build in.

You need the reserve for next.
Inacurate reading of pressure, and pressure loss in time.
Unequal weight R/L on the axle.
A little misyudging of weight
Can be you determine for max reserve, but because of all the factors, you end up with only yust enaugh to prevent overheating of tire-material, wich is only allowed " ZERO" times in tires use, and can lead to tire-failure, mayby after 2 years, when beginning internal cracks have build up enaugh.

 

The TPMS alert triggers around 32. Maybe 30, I don't quite remember. That's not much margin.

 

Sickpuppy, I'll use your recommendation. This fits more in line with my personal experience and better backroad handling preferences. Thanks.

 

recommended 33, i just put in 35. I bought this costco jump starter/tire pressure cube and its been super convenient cuz it has the air compressor built into the side of the cube and it'll automatically stop once it reaches the set PSI. Super portable, great for all usages (even household devices)

https://www.costco.com/cat-cube-lith...000147677.html

 

I stick with 33; personally, not a fan of a slightly harsher ride. My 2018 is firm (harsh?) enough, and more tire pressure doesn’t help traction (although it might seem to improve steering response).
Speaking of tire pressure. I’ve had my LC for just over a year, through the heat of summer and the depths of winter here in Vermont. Ordinary with a big temperature drop you would expect to see a reduction in tire pressure (checked cold). Haven’t seen it here.
This car came to me from Palm Springs, Cal., and was low-mileage and beautifully maintained. So it’s possible the tires are filled with nitrogen, which would account for the pressure stability. Anybody know anything about using nitrogen in street tires? I know it’s used in racing applications.

 

Higher rear pressure will reduce initial traction available from a standing start. However, higher pressure, for me gives a firmer feel to the sidewalls and more feeling throughout the chassis and the steering. To each their own. The manufacturer bases their tire pressure recommendations on many values and comes up with a very good compromise.

 

33 is my target pressure as well. During summer she increases to 37/38 in the heat of the day.

 

Exactly, most people don't understand tire pressures when measured is at the cold setting, not after it heats up. 32-33 is a good range (cold).

 

Most shops will set the pressure 3-4psi to account for a tire being warm and the air pressure increasing. Yes the car might have been sitting for hours before it made it to service but it’s just easier to be consistent