Is this too much air???

Eh, people are always going to suggest it anyways, why not throw it in there and just get the arguments out of the way right off the bat. Not like it wasn't a shitpost to begin with.

I just read my door jamb and let 'er go unless I'm hauling heavy shit or going off pavement; inflate or deflate as required.

 

...drums

 

As long as you realize that only applies to the exact size on the sticker and is for max vehicle weight.

Better yet, consult a chart that has your exact size and weight of vehicle to determine your correct tire pressure.
https://www.toyotires.com/media/pxcjubjs/application_of_load_inflation_tables_20200723.pdf

 

Recommended psi or adjusted recommended psi has a load capacity 1.54 times that of gvwr...
I'm wondering what your reasoning for inflating beyond that is, when "hauling heavy shit".

 

The combination of terrible timing and Murphy's Law states almost every time I've had my tires swapped either winter-summer or summer-winter in the past 6 years I've had to load my truck bed up with 1000 pounds of whatever, this winter swap it was a toolbox and all of my automotive tools, and in that same instance of Murphy's Law no one in this town can hire a competent employee that can balance tires properly. 30psi, shit balanced tall and skinny LT tires, and a heavy bed makes things real, real squishy, and feels like I'm towing a 4000lb trailer through a highway made of entirely of bouncy castles because it's always a static imbalance.

Should I change them myself? Probably. Do I want to spend my own time changing tires? Fuck no. I love my trade but I hate mounting tires. I don't mind teaching people to mount them, but doing it myself routinely is one thing I don't miss from technical training.

 

I can dig it...

 

Hello Apple, this is an Orange...

In all such racing series, the tire manufacturers go in with an expected pressure range from previous data. They then test those pressures to see how they work and last.

Automobile manufacturers set the pressures you see in the door jamb by testing also. The numbers are for the tires that are original spec. Anything other than OEM spec tires, you are on your own for pressure, though stock sizes should see similar pressures work fine. Once you change size, all bets are off.

 

Great info. Per the chart in the link, I probably should be running about 47psi in my LT's for OEM load capacity. I'm running 40-42, which means my load capacity will be down a bit. I had been guessing by feel up to this point. I might try upping the pressure to see how they feel though I don't run anywhere near load capacity usually.

Conversely, if I were to run door sticker pressures, the load capacity would be down around 30% from stock!

 

Tacomas come with a variety of sizes, load ratings, rim widths and recommended psi. They all coalesce to an inflated load capacity of 2,149 lbs for P-metric and euro metric tires; or 1,954 lbs for all LT rated tires after de-rating. PSI is only a means to that end.
Recommended psi or 'adjusted' recommended psi is good up to gvwr. Anything under over or under is subjective preference. Under is usually someone doing a chalk test and does not anticipate increased cargo or passenger weight; and also subject to inaccuracy if done incorrectly(99.9%* of advocates). Over is usually someone hypermiling or after subjective feel/steering response.

 

I'm dubious...I think you might have made an error in calculation.
What size is your LT tire?

 

265/75/16. Getting my numbers from the linked PDF.

 

It's 37 psi...
I suspect you failed to derate for P/Euro-metric to LT conversion or did not make the distinction between P and euro-metric tires(there is a difference) when obtaining your oem inflated load capacity. 2,149÷1.1=1,954 lbs. Read the section on P/Euro-metric LT to conversion...

I am an advocate of "the charts"...but, you have to be accurate about the input info and calculations.

 

I think you may be right...

 

I edited my post while you replied. Read for additional info...

 

What size did you change to that requires so much more pressure? Low profile tires?

Edit to add just read the rest of your replies. Yeah, definitely have to make sure you account for p-metric loads and then make sure you're looking up the correct size on the chart, and then making sure it's the single load and not the dual.

 

I am rarely at gross weight. I use my actual weight X1.6 for my recommended psi and then adjust from there. I do add air when on longer interstate travels for mpg gains or for carrying heavier loads. I probably adjust my tires more than most, but like optimal pressures for each use of my vehicles. I don't have interstate commutes and usually stay below 60mph for most of my driving, and am usually solo, so I know my weight and needs.

 

Some aren't as conscious about it...
For some, it's easy to load up and hit gvwr.
E.g.~Load up three of your good sized friends and their gun gear and head down the interstate for 2 hours to a 3-gun match...

If a person inflates higher than 36 psi in a P or euro-metric SL tire, the designed load capacity does not increase. Anything over, up to max psi of the tire, is to maintain the speed rating of the tire at very high speeds(illegal speeds.) It's subjective feel after that.

I try to state just the facts; trying to make people more conscious. What they decide to do with the info is entirely up to them.

 

Yeah, the vast majority have no idea what their psi is or should be, and the number of people driving around with near flats is still a lot considering most cars have TPMS now.

 

Heh...
I'm an electrician, currently wiring a middle school...
I noticed a guy at work this week, sitting in his suv at lunch, parked on a grapefruit sized rock...
Looked like a good offroad pressure. Highway; not so much.
I didn't say a damned thing...

 

Smart! I got to a certain age and ask myself "why should I care more about xyz then he or she does?"
It's absolutely great to help others, but they have to want help, many do not, they are not worth your time.