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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Tire Pressure Monitors



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      06-16-2005, 04:36 AM   #1
RachelS
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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.
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      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, 05:08 AM   #3
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thank you, no extras to buy when getting new tires and wheels

hoooray
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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, 06:08 AM   #5
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thanks E90Fleet and Broken1
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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.

Quote:
Originally Posted by E90Fleet
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, 12:06 PM   #7
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Quote:
Originally Posted by RedStripe
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.
You do it yourself. Page 80 in the Owner's Manual
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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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Quote:
Originally Posted by JustinS View Post
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.

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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Quote:
Originally Posted by E90Fleet View Post
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.
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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Quote:
Originally Posted by cb1111 View Post
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.
Don't you also have to check what CODE your car has by entering the VIN number into this link?

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, 09:28 AM   #12
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60 used the DSC. 07 and up uses a monitor in the tire.
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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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Quote:
Originally Posted by remmib View Post
This thread is from 2005....
Holy crap it is haha
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      09-24-2010, 02:14 PM   #15
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Quote:
Originally Posted by remmib View Post
This thread is from 2005....
so it is, I never checked LOL
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      09-24-2010, 02:19 PM   #16
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Quote:
Originally Posted by Rolf-Dieter View Post
so it is, I never checked LOL
At this point we all slap ourselves on the forehead - d'oh.

But to answer your other thread, it is more cost effective to get a second set of sensors for your winter wheels.
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      09-24-2010, 03:00 PM   #17
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Quote:
Originally Posted by cb1111 View Post
At this point we all slap ourselves on the forehead - d'oh.

But to answer your other thread, it is more cost effective to get a second set of sensors for your winter wheels.
of course you are right I made the math also I don't like to disturb the tire otherwise I also am looking at new wheels balancing

Thanks for your post(s)

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