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Model 3 TPMS off by 3-5 PSI?
- Thread starter tvisdog
- Start date
JeffK
Well-Known Member
It's not the car brand, it'd be the supplier. If it's the same supplier as Model S, I believe the newer ones are from Continental (I could be wrong). If anyone knows for sure, please post.
Last edited:
rtanov
Member
My i3 is off by 1-2 psi but I like it more because it also shows the temperature (I know that P & T are directly correlated in the ideal gas law but still find this useful), and gives the warning when the pressure is really low instead of at the pressure I find best for the car as in the Model 3.
I'm on V9, and the tire pressure warning came on at 38 PSI. Also, the placard on my car shows the recommended pressure as 42 PSI.
voip-ninja
Give me some sugar baby
My car came from Tesla with tires set at nearly 50 PSI. The car handled pretty rough due to the tires being overinflated. Per Elon Musk you should set the tires at 45 PSI for range or 39 PSI for comfort. I am unable to set my tires at 39 PSI for comfort since the crap TPMS monitoring system on the Model 3 considers real PSI of 39, which it reads as 36 PSI as being dangerously low and puts the car into alarm.
It is pretty silly how tight Tesla has made the low pressure warning. 3 or 4 PSI at the 40 PSI range really isn't going to make a difference from a safety standpoint. They should set the low pressure warning so that it doesn't come on until at least 8 PSI less than the recommended inflation pressure. Since Tesla is now officially recommending 42 PSI on the placard, I think 34 PSI or preferably 32 PSI would be more reasonable choices.
voip-ninja
Give me some sugar baby
Someone previously reported that when the warning comes on is regulated and determined by a certain offset (20%?) from what the placard says. Realize that older cars had door placards advising 45psi (I believe mine says 45).
Even then though Tesla should be able to lower it. Tesla should also be able to easily fix this problem in software as far as altitude offset.
I agree. The warning should be at 32 psi. Our car is throwing pressure warnings as the pressures dither down to 36-37 psi. I gave up on trying to run at 38 psi for comfort and pumped them up to 40 psi according to the car, 41 psi on my analog gauge.
voip-ninja
Give me some sugar baby
That is perfectly normal. Just because the reading goes down over time and temperature doesn't mean that there's a leak. The original complaint in this thread is the readings differing from an external gauge.
This is normal in cold weather. Unless you have your car filled with Nitrogen where pressure wouldn't be affected much.
Nitrogen is the largest component of earth's atmosphere, so it still behaves like air and it will lose pressure with temperature pretty much the same way. Nitrogen is a slightly larger molecule than oxygen so it will not escape as easily through the rubber.
So this thread is all about the TPMS issue misreading, but has anyone heard of an issue with one tire losing up to 10 psi overnight? I have been to SC 4 times and they have neve3r found an issue. They have replaced the tire and put in new stem. I was told the third time that they replaced the wheel, but now told that wasnt done. They just went through the same exercise of testing the tire and found no issue. Any suggestions?
SomeJoe7777
Marginally-Known Member
Might be a crack in the wheel. Take it to an independent tire shop like Discount Tire (also known as America's Tire in some locations in the US), they have a tank they can dunk the entire tire/wheel in and look for bubbles. Just make sure they know how to jack up the car correctly (place jack at the exact jack point, don't hit the battery).
Uncle Paul
Well-Known Member
This must be as frustrating for Tesla as for owners.
The tire pressure monitoring system is a Federally mandated item. By law, Tesla must install them. The purpose is to increase fuel economy by monitoring low tire pressures. Obviously low tire pressures in a Tesla will not negatively effect the amount of gas used : >)
Altitude effects all these readings, and I am not sure the sensors can be recalibrated by Tesla. The only thing I think they could do is reduce the pressure amount that triggers a warning, but even then they might be running afoul of Federal regulations.
It is a bit analogous to how normally aspirated ICE vehicles produce significantly less horsepower and torque at higher altitudes. There is nothing the ICE manufacturers can do even though they rate their motors output significantly higher than their high altitude customers will experience.
A 3 minute egg takes longer to boil at altitude as well, but they may still call it a 3 minuted egg.
The tire pressure monitoring system is a Federally mandated item. By law, Tesla must install them. The purpose is to increase fuel economy by monitoring low tire pressures. Obviously low tire pressures in a Tesla will not negatively effect the amount of gas used : >)
Altitude effects all these readings, and I am not sure the sensors can be recalibrated by Tesla. The only thing I think they could do is reduce the pressure amount that triggers a warning, but even then they might be running afoul of Federal regulations.
It is a bit analogous to how normally aspirated ICE vehicles produce significantly less horsepower and torque at higher altitudes. There is nothing the ICE manufacturers can do even though they rate their motors output significantly higher than their high altitude customers will experience.
A 3 minute egg takes longer to boil at altitude as well, but they may still call it a 3 minuted egg.
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