tpsm false readings
Thread Starter
Heel & Toe
Joined: Jan 2009
Posts: 23
Likes: 0
From: parkland fl
tpsm false readings
I just got new falken 452 to replace my gy runcraps . With the new tires came new valves and o rings for the tpms . The tires were filled with nitrogen and the sensors are all showing 4 lbs less pressure then the tire stores guage and my guage show.
Does anyone have any ideas what is causing this ?
ps. these falkens are a drastic improvement over the GYs
Thanks
.
Does anyone have any ideas what is causing this ?
ps. these falkens are a drastic improvement over the GYs
Thanks
.
Racer
Joined: Nov 2008
Posts: 296
Likes: 0
From: Colorado
Ummmmm..... That makes no sense..... True at elevation the ambient environmental pressure is less but that will not change the interior pressure. Tires are a closed system that are for all intents and purposes non-elastic. temperature will change pressure but not elevation. Sensors are probably out of calibration.... They "should" read exactly what a Tire pressure meter does at the valve stem. I have 1 out of 4 sensors like that. dont know how to fix it but doesnt really bother me since i know the TPS baseline...
Thread Starter
Heel & Toe
Joined: Jan 2009
Posts: 23
Likes: 0
From: parkland fl
thanks guys...I live in Florida which is 10 feet msl ( above sea level ). I have driven the car for a while at highway speeds . I am still at aloss for the tire pressure disparity . They are all exactly 4 lbs off with 3 different high quality tire gauges.
Safety Car
Joined: May 2000
Posts: 4,827
Likes: 352
From: Albuquerque NM
Ummmmm..... That makes no sense..... True at elevation the ambient environmental pressure is less but that will not change the interior pressure. Tires are a closed system that are for all intents and purposes non-elastic. temperature will change pressure but not elevation. Sensors are probably out of calibration.... They "should" read exactly what a Tire pressure meter does at the valve stem. I have 1 out of 4 sensors like that. dont know how to fix it but doesnt really bother me since i know the TPS baseline...
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Thread Starter
Heel & Toe
Joined: Jan 2009
Posts: 23
Likes: 0
From: parkland fl
The tires are brand new and have not changed from showing 32psi on the tire stores gauge and both my digital and analog gauges ; while the car sensor shows 28 . The pressure has remained steady .
Le Mans Master
Joined: Dec 2004
Posts: 5,493
Likes: 809
From: West coast CA
If you deflate one tire by two pounds, drive around the block a few times to wake up the system, does the reading in the DIC update to reflect the lower pressure?
Thread Starter
Heel & Toe
Joined: Jan 2009
Posts: 23
Likes: 0
From: parkland fl
they installed a kit with new o rings and valves and put the old sensors back on . If I lower the pressure and drive around, the new pressure will show up ; only it will be 4psi lower then the gauges show.
Team Owner
Joined: Mar 2008
Posts: 21,502
Likes: 462
From: Southern Utah
This is true. The sensors would work like a tire gauge if they DID have access to ambient pressure...but they don't.....so they read low as elevation increases. I live at 6000 and they read low here, but accurate when I am in Ca. at the beach. Glad I didn't have this car when I lived at 10,150'
Race Director
Joined: Dec 2007
Posts: 19,574
Likes: 167
From: Frederick, MD
I have no idea about the OP's problem though. Maybe the nitrogen is screwing up the sensor's ready since it is not regular air. I considered nitrogen just because it is more stable but if it screws up the sensor readings forget it.
Safety Car
Joined: May 2000
Posts: 4,827
Likes: 352
From: Albuquerque NM
Somehow I knew this member was from about a mile high before I looked at his profile (Albuquerque, NM). My consistently read 10% (IE 3psi low compared to two manual gages (Digital and old school) that I have. It doesn't matter what temperature the tires are at, although temperature drops/increases will affect your tire pressure. Best to check them cold every morning while you are driving especially out west where 5-10k feet is nothing.
I have no idea about the OP's problem though. Maybe the nitrogen is screwing up the sensor's ready since it is not regular air. I considered nitrogen just because it is more stable but if it screws up the sensor readings forget it.
I have no idea about the OP's problem though. Maybe the nitrogen is screwing up the sensor's ready since it is not regular air. I considered nitrogen just because it is more stable but if it screws up the sensor readings forget it.
Drifting
Joined: Apr 2006
Posts: 1,276
Likes: 5
From: Ambler Pa.
Just for grins, dump the nitrogen, refill with air. Check your readings. Years ago I worked at an airport, on some of the aircraft we used nitrogen for tire fill. Pressure would remain more stable at different altitudes and temps. 
Safety Car
Joined: May 2007
Posts: 3,664
Likes: 49
From: Atlanta GA
The difference you see is the difference in the accuracy of measurement between the TPMS and a non-digital, or digital handheld guage. There will always be some disparity in the readings. In atlanta I always see about a 1-3psi difference in my measurements vs. the tpms. Especially if the temperature changes a lot during the day.