TPMS pressure increase

I recently purchased a 2018 Tundra SR 4x4 work truck. The dealer had added alloy wheels and P255 70 R18 Nitto Terra Grapplers. I have for many years ran 10 ply E rated tires so I had LT 275 70 R18 Terra Grapplers E load rated tires put on only to discover the TPMS maxes out at 50 psi. Toyota tells me they can’t up the pressure above factory specs. Is there a fix for this or am I stuck looking at that orange flat tire?

 

I think the BullyDog GT can fix this. I've been looking for a solution, but for the opposite problem. I want to be able to go down to 20lbs or whatever and not have a light on all day on the trails.

https://www.bullydog.com/products/bd/BDGTPG/bully-dog-gt-gas

 

What tire requires more than 50 psi??

 

Do you really need them above 49 psi?
Seems load E will be stiff enough, never mind with that kinda air pressure

 

I spoke to different Toyota Service Writer today and he is telling me there should not be a ceiling of 50 psi. I will have to take it in and let the computer look at it. The previous service writer at Toyota told me they can reset the bottom threshold to run less pressure, so I don’t know. I ain’t sure they do. I will take a look at that Bullydog product. Thank you.
All the load range E tires I have ran, at least the last 15 years or so (sorry can’t recollect back farther) have a maximum load pressure of 80 psi. Granted I only ran it up that high towing a heavy load or carrying a heavy load but that’s what the idea was. The old formula I have for working out inflation pressure is the maximum load of the tire divided by the maximum pressure gives you the weight per each psi. Then multiply the weight per each psi by the psi you have the tire inflated to and that gives you the current load rating. In other words for the Nitto Terra Grappler in LT275 70 R18 the max load for Tire is 3650 pounds and maximum psi is 80 so 3650 divided by the 80 is 45.6 for each pound of tire pressure. If I run 40 psi in that tire it’s maximum recommended load per tire is 1825 pounds. You want to carry more load or tow a heavy load you increase the psi thereby raising the load rating. The P 255 70 R18 Nitto Terra Grapplers that came on the truck were rated I believe at 2460 pounds at a maximum inflation of 44 psi. To get the same load rating with the E rated tires I need to run about 53-54 psi.
I am pretty certain I will never run 80 psi in these tires on this truck but I do want to run 50 or 60 or even a little more when maxed out on load.
Please bear in mind I understand the need to deflate for off road trail use but when carrying tools and dragging a trailer with a small tractor etc. in Texas heat on some pretty bad roads the E rated tires are just more reliable in my opinion.
I haven’t had a half ton pickup since the late 90’s but I don’t really need the 3/4 ton or 1 ton anymore. I don’t haul as much as often. The tractor is around 5,000 pounds trailer and all and it only gets moved from East Texas to Central Texas and back a couple of times a year. The Tundra certainly seemed like that is well within its capabilities. I just didn’t trust the 6 ply tires as much as I probably could.
I hope that helps clarify my intended purpose. I use to really enjoy off-road and trails, I have drove some kind of a 4x4 since 81, but have drove 1 tons and 3/4 tons since 97 or 98. I was ready for something that rode better and got at least a little more than 11 miles to the gallon. I think I will like this Tundra if I can get the initial bugs worked out. I have a couple of friends driving Tundras and they love them and they assure me it will do what I need. Of course I am the only one that has encountered any glitches but that’s par for the course with me. Thank y’all for any help and sorry about getting long winded.

 

For LT275/70R18 you can run at 45psi to get 2470lbs

 

Thank you for that chart. I appreciate it.