Free ride mods - results after a long trip.

jadatis wrote:
I would like to put your data in my motorhomeRV tire pressure calculator to see what pressure advice it gives , so I can check if my determined idea of staying above 85% of the weight the pressure is calculated for to get acceptable comfort and gripp, is right or has to be adyusted.

Already read 6340 lbs on the front axle in a post of yours
So need also rear and configuration like singe or dual load behind.
From tires maximum load and needed pressure for that , from sidewall.
To make it complete also speedcode and sises of tire.

About the temperature.
What TPMS measure is the temperature of the air inside the tire.
Only by driving this rises normally for normal car tires about from 18dgrC/65dgr F outside ambiënt temperature to 45C/112F warm only by driving, so a rise of 27dgrC/47dgrF . LT and truck-tires probably colder because larger volume .
But by severe braking the temperature inside the tire can rise up to boiling point of water even = 100dgr C/200dgr F??. Tires and valves are tested and standardised to stand that temperature and the pressure rising that goes with it.
so only by driving the pressure can rise about roughly 10% but incidentially more.

Edit: reading back I notice that the temperature rises only 5 to 10 degrees but the pressure rises about 10 psi.
this is not what calculations would give , for 10 psi rising so about 12% a much larger temperature inside the tire is needed.
This makes me suspect that or the temperature , or the pressure reading is inacurate.

I am struggling with understanding your post. Are you saying it's wrong? You have to factor starting ambient temp (left MD) and changes in ambient temp (FL) as well as elevation changes (as much as 3,000 ft). All things considered I feel the changes I made are not only safe but about as close to accurate as one can get given the tools involved. The numbers were an average. The point being that - I never saw what I would consider a dramatic rise in psi, or more importantly temp. Which translates to me that the changes are safe one. (Also keeping the chart in mind and weights) BTW the rear axle weight was 8660 (/4 = 2165 per tire). Again waaay under for the GY chart minimum and much much less than what the sticker says. Again that was loaded. If you are saying my average numbers of temp vs psi don't match I would have no way to argue that point. I would imagine the TST is accurate but not perfectly accurate. I am not flying the space shuttle, I am driving a MH so I would imagine it's accurate enough. I am not sure what system would be more accurate that's either affordable or feasible. Thresholds are the key here and throughout the trip I was well within any unsafe parameters and I set them conservatively to err on the side of caution.