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Tire Pressure Monitors
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06-16-2005, 04:36 AM | #1 |
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Tire Pressure Monitors
Tire Pressure Monitors..
When I get new wheels, are they inside the old ones. One guy says they don't have any inside each wheel, they are just sensors that watch tire spin. |
06-16-2005, 04:58 AM | #2 |
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I believe that it's incorperated into the DSC system. It monitors the wheels spinning, if the tyre deflates, the "circumfrence" of the tyre is smaller and hence it spins faster and the DSC can read this...and warn the driver.
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06-16-2005, 05:13 AM | #4 |
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The old systems used to be in the tires and actually cheked the pressure
The new systems use DSC to detect a change in the rolling diameter of the wheel due to a pressure loss. You must reset the system each time you change the tire pressures or change a tire. |
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06-16-2005, 12:02 PM | #6 | |
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Does anyone know how to do this reset? Is this possibly a do it yourself thing? Is it a must go to the dealership thing? Thanks.
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06-16-2005, 12:06 PM | #7 | |
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09-24-2010, 05:00 AM | #8 |
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Not sure if I get it, why do some people talk about selling wheels with TPMS then? Sounds like it's not required anymore? Sorry, this probably a real newb question.
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09-24-2010, 06:37 AM | #9 | |
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Again, the misinformation is astounding. Can we please check the OP's location before answering? For the US (and only the US) TPMS sensors have been required in all new cars since the '07 model year. These sensors actively determine the amount of pressure in each tire and report that to the car. Pursuant to the TREAD Act, the car must alert you if the pressure falls by 25% - i.e. if your tires are at 40psi, then the car must alert you NLT 30psi. For BMW, the sensors changed with the '10 model year, so ask wwhat year the sensors came from. TPMS sensors are small pressure sensors attached to the inside of your valve stems. They are installed at the time that the tires are mounted to the wheels. If retrofitting new sensors then the tire must be (at least partially) dismounted. The rest of the world including Canada but excluding the US Either uses nothing or it uses the "indirect" method where a change in the rolling diameter alerts the driver of a problem - like Broken1 explained. The indirect method is too inaccurate as it merely senses a difference in rolling diameter. Accordingly, if all tires lost air (think long term storage) then you would not get notification. Conversely, the direct method would alert you to a loss of pressure in all tires. In addition, the indirect method reacts fairly slowly and was not considered a viable alternative following the Explorer/Firestone debacle. You will find the indirect method (called Flat Tire Monitor [FTM] by BMW) on some '06s and cars in Canada. |
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09-24-2010, 07:43 AM | #10 |
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I think you got that flipped, I believe all cars 07 and up have tpms in the tires and earlier models than that used the DSC.
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09-24-2010, 09:15 AM | #11 | |
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Car made for US or Canada Vin - CODE decoder here Tire pressure monitoring systems as you say are different in the US and or Canada. Also, if you change to winter tires with a new set of wheels you need the TPMS also in those wheels or the light on the dash will be on all the time (some people mount winter tires without the TPMS since it is quite expensive ranging from $200- to $400- for the car depending on the system, so I am told).
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09-24-2010, 12:11 PM | #13 |
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This thread is from 2005....
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09-24-2010, 12:43 PM | #14 |
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09-24-2010, 02:14 PM | #15 |
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09-24-2010, 02:19 PM | #16 |
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09-24-2010, 03:00 PM | #17 | |
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Thanks for your post(s) Cheers Rolf-Dieter
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