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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 > TPMS with non RFT tires



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      10-16-2009, 01:17 PM   #1
poiney
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Question TPMS with non RFT tires

If the TPMS gets damaged or battery dies, I'm wondering if it is worth replacing. Questions:

Do you think that the TPMS is more sensitive than your own sense of a leaking low-pressure tire, so that you might get to a tire shop faster, and hence avoid the risk of having an undrivable flat?

If TPMS fails, how annoying is the alarm (assuming you have Idrive with Navi). Does the screen display the car image continuously, or just give you an alarm temporarily like some of the other idiot lights. Thanks.
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      10-16-2009, 03:57 PM   #2
pruettfan
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I know some cars will not let you drive over 50 mph if TPMS is not working. Not sure about BMW. It will not be worth the alarms and lights to save a few bucks. You can get an entire set of 4 brand new sensors for 200 bucks. Do you really want to drive a 40k car around with warning lights etc to save 50 bucks?? I am certain that if the system fails you will get a lot of warnings regardless of Idrive or not.

TPMS is far better at sensing tire pressure then a human. It was developed by Formula One and then used in Indycar because professional drivers could not sense when they had a slow leak and ended up having tire failures due to low pressure and crashed. It is required in the USA since 2007 due to a great deal of evidence that it works well to make things safer. One of the values of it is it will tell you when your tires are just a little low on pressure due to natural changes, this saves tire wear due to low pressure and saves gas because low pressure causes more rolling resistance.
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      10-16-2009, 07:10 PM   #3
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Thanks for reply. If it restricts max speed, then the deal is done of course.

BTW, My line of thinking was that if the TPMS failed and it was simply an alarm that goes away after a couple seconds, then I might wait until the next time I needed to buy tires (e.g., flat or old age) before I repaired it.

Based on my experience, I don't believe that my sensor can detect much better than a loss of 10psi. I would guess that for F1 cars, the resolution is probably much better.
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