TPMS reading vs Reality

[M0unt41nm4n]

I am a bit of a tire geek and try to keep my tires at or above the recommended pressures, it not only by a slight bit. I try to monitor my tires semi-constantly and keep them in great shape to make them last.

I have noticed the CT TMS seems to be off by 5.5-6%+ on the pressures that they report.

I noticed that the tires were squaking at me at about 47lbs. I checked them and the digital meters said they were right at 50 which is about 6% difference. I raised it to about 53 on a regular pressure tester and the Tesla showed 50.

I like them a few lbs over for good measure, especially during the cold weather because the cold impacts air density.

I like the CT to report 53lbs. My electronic air tester shows 56. I tried a few other digital testers and a manual version. They show 56. That may be a tad bit much. But the CT says 53!

Anyone else see such a delta on what Tesla TMS reports vs actuals?

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[AlmostHuman]

I have seen this on almost every ride I have had and it drives me nuts. I basically use the TPMS numbers as a “okay I don’t have a flat” and check them regularly with a different tool.

 

[M0unt41nm4n]

I have seen this on almost every ride I have had and it drives me nuts. I basically use the TPMS numbers as a “okay I don’t have a flat” and check them regularly with a different tool.

Oh I agree! But then after a trip, it says "You could have better mileage if you"... "keep your tire pressure above 50". It is ?

My point is, if they are gonna bug us, they might as well make it more accurate.

 

[AlmostHuman]

Guess the real question is, what the heck are ALL of them off? I mean we put humans on the moon a LONG time ago. Can we make a TPMS system that is accurate?

 

[REM]

I am a bit of a tire geek and try to keep my tires at or above the recommended pressures, it not only by a slight bit. I try to monitor my tires semi-constantly and keep them in great shape to make them last.

I have noticed the CT TMS seems to be off by 5.5-6%+ on the pressures that they report.

I noticed that the tires were squaking at me at about 47lbs. I checked them and the digital meters said they were right at 50 which is about 6% difference. I raised it to about 53 on a regular pressure tester and the Tesla showed 50.

I like them a few lbs over for good measure, especially during the cold weather because the cold impacts air density.

I like the CT to report 53lbs. My electronic air tester shows 56. I tried a few other digital testers and a manual version. They show 56. That may be a tad bit much. But the CT says 53!

Anyone else see such a delta on what Tesla TMS reports vs actuals?

Were your measurement tools the same temperature as the TPMS sensors at the time of reading?

 

[M0unt41nm4n]

Were your measurement tools the same temperature as the TPMS sensors at the time of reading?

Yep. They are all in a heated garage. Same place, same Bat Channel.

 

[MyFirstElectricTesla]

I am a bit of a tire geek and try to keep my tires at or above the recommended pressures, it not only by a slight bit. I try to monitor my tires semi-constantly and keep them in great shape to make them last.

I have noticed the CT TMS seems to be off by 5.5-6%+ on the pressures that they report.

I noticed that the tires were squaking at me at about 47lbs. I checked them and the digital meters said they were right at 50 which is about 6% difference. I raised it to about 53 on a regular pressure tester and the Tesla showed 50.

I like them a few lbs over for good measure, especially during the cold weather because the cold impacts air density.

I like the CT to report 53lbs. My electronic air tester shows 56. I tried a few other digital testers and a manual version. They show 56. That may be a tad bit much. But the CT says 53!

Anyone else see such a delta on what Tesla TMS reports vs actuals?

Have fun checking PSI with wheel covers on. It's the main reason I don't have them on.

I'm using N2 from Costco and they don't loose pressure much. And all readings Costco air station, CT screen, Not digital Pro PSI gauge are about 1 PSI different.

 

[M0unt41nm4n]

Have fun checking PSI with wheel covers on. It's the main reason I don't have them on.

I'm using N2 from Costco and they don't loose pressure much. And all readings Costco air station, CT screen, Not digital Pro PSI gauge are about 1 PSI different.

I took em off. This was actually the same as issue pre-wheel covers. Not sure how that impacts issues in a regulated temperature room and they don't touch the tires.

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