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11-13-2020, 09:14 AM | #1 |
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Silly questions re TPMS
I never bothered asking, but how does ours work and where are they located? Do the shops changing my tires know to put them back when fitting new tires? Is it possible for them to forget to put back the relevant parts and if so will the system give a warning that the parts are missing and can no longer compute tire pressure? Tx.
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11-13-2020, 10:18 AM | #2 | |
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There are no sensors in the wheels. Flat tire is confirmed by measuring the rolling diameter of the wheel.
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It should work with any wheel set. Just have to reset them on idrive menu.
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11-13-2020, 11:04 AM | #3 |
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Whoa, whoa, whoa! Back the truck up KennyP! Where did you get that? BMW uses wheel sensors in most (if not all) of their vehicles and certainly in the E89 (unless they did something different on EU cars). All you have to do is look at the valve stem to see the lock nut on the outside that secures the metal sensor to the rim. The type of TPMS system you're referring to (commonly used by Mazda until recently) uses a conventional rubber valve stem and rotational sensors located behind each wheel. As for the OP's question about a tire shop not knowing how to handle these components when changing tires, not likely!
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11-13-2020, 11:41 AM | #4 |
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Ok, so the shops should know what they're doing. What does the locking nut look like? I haven't really taken a look at them vs a reg valve stem. Also, if they were removed, my system would tell me there's an error, right? Tx.
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11-13-2020, 03:08 PM | #5 |
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Yes, of course the system would signal a missing sensor. You may be overthinking this! Just look at the valve stem on one of the wheels. It will look like this:
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11-14-2020, 02:23 PM | #6 | |
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Another silly question, so since are attached to the valve stem, only 1 set of tires (either summer or winter) will be equipped w tpms then and the other not? If that's the case, shouldn't my car be ringing a warning when I switched to the other set? Or maybe when I bought my original winter tire pkg at the dealership they were already equipped with its dedicated tpms, in addition to the one that came w the car? Last edited by tranquility; 11-14-2020 at 02:31 PM.. |
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11-14-2020, 03:51 PM | #7 |
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OK, according to this thread
https://www.2addicts.com/forums/show....php?t=1130800 all (some?) Canadian market Z4s have an FTM (flat tire monitor) system rather than TMPS as on US cars. That would explain your rubber valve stems. |
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11-14-2020, 04:16 PM | #8 | |
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11-15-2020, 11:01 AM | #9 | |
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TPMS is better, if you can see your pressures inside a car, for sure. FTM needs a large pressure drop to start notifying about flat tire. I have had it happen once and my tire was around 1 bar less than it should have been. When going from 2.9bar to 2.4bar in the rear tires i get no warning and have to manually check. I have Michelin electronic pressure gauge for that in the glovebox.
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2009 35i DCT Havana brown with ivory white interior. Mods: Cobb stage 1+FMIC, Wagner EVO1 FMIC, BMS DCI, Forge DV-s, Masata Chargepipe, KW V3 suspension, M3 front control arms, Hardrace RTABS + balljoints, Michelin Pilot Sport 4S tires.
Last edited by KennyP; 11-15-2020 at 11:16 AM.. |
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11-15-2020, 11:34 AM | #10 | |
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11-15-2020, 12:27 PM | #11 |
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Tx guys for the info. My memory's bad but I now kinda remember BMW allegedly didn't want to get blamed(potentially sued?) if the tpms gave out inaccurate readings so they supposedly wimped out and went w this simpler but less detailed FTM sys...who knows the real reason? I dunno what's the status quo now.
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