TPMS accuracy
Safety Car
Joined: Dec 2009
Posts: 4,194
Likes: 305
From: Lake Havasu City Arizona
SoCal Events Coordinator
St. Jude Donor '12
I think you will find them to be very accurate. You might pick up a good quality tire gauge though in the event you ever get a low tire reading.
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Safety Car
Joined: May 2000
Posts: 4,821
Likes: 347
From: Albuquerque NM
Depends on the altitude at which you drive. Sea level, very accurate. Now, at 6,000 feet they're off, they read low by about 4 pounds. As the altitude goes up, they read lower and lower than actual.
Drifting
Joined: Aug 2015
Posts: 1,434
Likes: 183
From: Maple Ontario
And if you want an even greater degree of accuracy, use the metric display, in Kilopascals. 30 PSI is roughly 210KpA and that is a much finer scale than PSI. I know the Canadian cars go both ways... i imagine the US cars have it as a configurable option.
The biggest challenge is to get all 4 wheels to the same numbers in KpA.
You can even tell which side of the car is exposed to the sun... the numbers are like 10KpA higher.
The biggest challenge is to get all 4 wheels to the same numbers in KpA.
You can even tell which side of the car is exposed to the sun... the numbers are like 10KpA higher.
Racer
Joined: Dec 2004
Posts: 308
Likes: 40
From: Salt Lake City, Utah
Depends on the altitude at which you drive. Sea level, very accurate. Now, at 6,000 feet they're off, they read low by about 4 pounds. As the altitude goes up, they read lower and lower than actual.
This sounds good to me as I am at 4,500 ft and they look to read off by about 3 pounds.
Safety Car
Joined: May 2000
Posts: 4,821
Likes: 347
From: Albuquerque NM
Team Owner
Joined: Apr 2013
Posts: 26,227
Likes: 4,352
From: Chirper Island
At sea level they are very accurate; the higher you go, the bigger the difference is compared to a hand-held gauge.
If you live at a high altitude, fill properly (cold) using the hand-held gauge, then check the DIC. Now you know what they should read cold in the car. Not that big a deal, IMO. The DIC doesn't update often enough to use as a guide when filling, anyway, so you should always rely on a hand-held when filling.
If you live at a high altitude, fill properly (cold) using the hand-held gauge, then check the DIC. Now you know what they should read cold in the car. Not that big a deal, IMO. The DIC doesn't update often enough to use as a guide when filling, anyway, so you should always rely on a hand-held when filling.
Le Mans Master
Joined: Nov 2015
Posts: 7,382
Likes: 3,501
From: Lake Havasu City Arizona
Do this. When you get to sea level check and fill your tires as to the pressure you choose. When you drive back to your abode in the mountains, recheck it and you will have a baseline for what the difference should be and is.
Team Owner
Joined: Apr 2005
Posts: 35,747
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From: Northern NYs Adirondack Mountains,http://www.visitsacandaga.com.
On my fourth Vette with TPMS and I find then to be quite accurate.
I have a digital gauge that was checked out for accuracy (at a lab) and the Vettes equipment is quite close.
I have a digital gauge that was checked out for accuracy (at a lab) and the Vettes equipment is quite close.
Le Mans Master
Joined: Aug 2015
Posts: 6,884
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From: Toronto