i know the ones equiped on our cars are pretty accurate.

would they still be accurate with them being mounted on my rims by the band meathod?

to make that more clear.. took a band and wrapped them inside my after market rims.

reason for asking is.. pumped the tires up to 41psi at the gas station...
41psi according to the gas station psi gauge.

but my car read my tire pressure as 34-35

 

I have been wondering this myself... ever since I mounted my TE37s with the TPMS in them, I have been reading roughly 5 psi lower than my manual gauge... so I have a constant light on my dash.

The "Read this before asking a TPMS question" sticky mentions that there is no calibration that can be performed on these

 

Don't trust the gauge on the air hose at the gas station. Buy yourself a good quality air pressure gauge, keep it in the car, and use it.

Dave

 

hmm so i guess the tpms in our cars are no good

that sucks..

 

let me get this straight the TPMS is just "banded" to the inside of the rim and not out of the valve stem hole? if that is so then the sensor can't operate correctly, it needs to be able to "breathe and know what the outside pressure is and compare the inside of the tire, you will get a TPMS code for check sum error eventually... also happens if wrong valve core is used... not all the time but some times

 

https://my350z.com/forum/brakes-and-...s-sensors.html

basically used this meathod.. been driving like this for about 3 months.. no error code. but was wondering if it would messure the psi correctly.

just went out and bought a digital psi reader from walmart.

gonna see if it reads the same as what the car reads tomorrow!

 

Agree. Yes. If the sending unit is inside the tire it is inside the tire regardless of method. TPMS is an electronic gimmick. Do not rely on it for correct numbers.

 

I will say that while I don't rely on the TPMS to be completely accurate, I've found mine to be extremely accurate on my two sets of wheels with sensors. The TPMS is always within a 1/2 psi of my tire gauge. I may simply be lucky. The sensors should work just fine if they are banded.

 

The sensors are supposed to be accurate to ±1 psi.

 

well tired the digital gauge out.. and the tpms car sensors are accurate.

so i guess the gas station gauge was wack when i pumped my tired up to 40psi.

 

I have TE37 and mounted the TPMS in the valve stem, no banding necessary. 19 x 9.5 and 10.5 +22 all around. No issues and just as accurate as my tire gauge.

 

if your sensor has been "excited" or registered while installed "correctly" then it usually dosent need to check sum... if it reads 0 from a blow out or completely deflated tire then it will run a check sum in the sensor to "self check"... all vehicles in US 2007 and newer are required to have TPMS installed from the factory... remember the exploder rollover recall... well it was ruled low tire pressure as the cause for blow out, now to prevent it from happening again manufactures have to annoy every one with an annoying light when there is low tire pressures. TPMS are required to be accurate within 1PSI.

 

NEVER trust the gauge on an air compressor. I have two gauges for my air compressor at home, and both read high. This is just one of those things that old farts like myself learn over time I guess.