Does run flat indicator tell of tyre pressure drops?

bobbychariot · 11-22-2006, 04:38 AM

As above.
Do I need to regularly check tyre pressures or will the system warn me of any drops?

brinta · 11-22-2006, 06:01 AM

The system will do this. Actually I have i-driveand this system provides me this info. I don't now about the non i-drive versions.

canucklion · 11-22-2006, 07:52 AM

it warns you

KL2DC · 11-22-2006, 07:54 AM

only significant tire pressure drops...its a flat tire monitor (FTM) at best not a true-blue tire pressure monitoring system (TPMS), although US spec MY07 E9x models now come with a TPMS.

combatcarry · 11-22-2006, 08:41 AM

From experience it will only detect major changes in tire pressure. You still need to check the air pressure in your tires regularly. I assumed I didn't need to check my tire pressures, then after checking them before a road trip, they were all very underinflated with very different pressures in each tire.

Also, I had a flat tire and the FTM didn't detect it until after I had the tire fixed. The noise the tire made was a much better indicator of a flat than the computer.

aspiring335 · 11-22-2006, 08:53 AM

Quote:

Originally Posted by KL2DC

only significant tire pressure drops...its a flat tire monitor (FTM) at best not a true-blue tire pressure monitoring system (TPMS), although US spec MY07 E9x models now come with a TPMS.

Not necessarily a bad thing. My father-in-law's '06 Corvette has TPMS and it is completely unreliable and annoying -- always indicating underinflated tires when in fact they are fine. That could just be sloppy GM engineering, though...

rrandyy · 11-22-2006, 12:33 PM

Quote:

Originally Posted by KL2DC

only significant tire pressure drops...its a flat tire monitor (FTM) at best not a true-blue tire pressure monitoring system (TPMS), although US spec MY07 E9x models now come with a TPMS.

Will the TPMS tell the actual pressure (psi) in each tire?

xyz123 · 11-22-2006, 02:37 PM

I was astonished to read that the system that has a sensor inside the tire is set to alarm at 25% below the set pressure and that the external system that measures change in rolling diameter (as used on E90s up to now) is set to alarm at 30% below the set pressure. That folks, for a desired pressure of say, 34 psi would be 25.5 psi and 23.8 psi respectively. So, if you want your BMW to handle safely and the tires to not wear out before their time, you must, I repeat, must check the pressures with a proper gauge, preferably a Bourdon gauge like the old Drager (still have mine from the 1970's) or the BMW one that is available from the Parts Department.

scubajag · 11-22-2006, 08:44 PM

The tire pressure sensor is very accurate and as stated above will flash a warning at 30% less pressure than the starting pressure. I recommend checking tire pressure at all gas fill ups.

MikeCCrutchfield · 11-23-2006, 12:14 AM

Quote:

Originally Posted by scubajag

The tire pressure sensor is very accurate and as stated above will flash a warning at 30% less pressure than the starting pressure. I recommend checking tire pressure at all gas fill ups.

Unless you live at/just near a gas station....your readings will be skewed by driving to the gas station. Maybe check it on a weekend morning when you aren't in as much of a rush to leave the house.

11-22-2006, 04:38 AM	#1
bobbychariot New Member 1 Rep 26 Posts Drives: 2006 320d M Sport Join Date: Sep 2006 Location: UK iTrader: (0)	Does run flat indicator tell of tyre pressure drops? As above. Do I need to regularly check tyre pressures or will the system warn me of any drops?
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11-22-2006, 06:01 AM	#2
brinta Private 4 Rep 74 Posts Drives: BMW318d touring Join Date: Mar 2006 Location: Antwerp iTrader: (0)	The system will do this. Actually I have i-driveand this system provides me this info. I don't now about the non i-drive versions.
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11-22-2006, 07:52 AM	#3
canucklion pull my finger to get your kinder® surprise 148 Rep 10,455 Posts Drives: circles around you Join Date: Dec 2005 Location: Toronto, Canada iTrader: (9)	it warns you __________________
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11-22-2006, 07:54 AM	#4
KL2DC Moderator 318 Rep 17,767 Posts Drives: F36 428i,E90 328i, E85 Z4 3.0i Join Date: Jan 2006 Location: DC Metro iTrader: (23) Garage List 2015 F36 428i [0.00] 2011 E90 328i [0.00] 2006 E85 Z4 3.0i [0.00]	only significant tire pressure drops...its a flat tire monitor (FTM) at best not a true-blue tire pressure monitoring system (TPMS), although US spec MY07 E9x models now come with a TPMS. __________________ Official DC Metro Registry - Current, New & Prospective Area Members Roll Call!
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11-22-2006, 08:41 AM	#5
combatcarry Private First Class 24 Rep 177 Posts Drives: '06 325i Join Date: Nov 2005 Location: Utah iTrader: (3)	You still have to check your tires From experience it will only detect major changes in tire pressure. You still need to check the air pressure in your tires regularly. I assumed I didn't need to check my tire pressures, then after checking them before a road trip, they were all very underinflated with very different pressures in each tire. Also, I had a flat tire and the FTM didn't detect it until after I had the tire fixed. The noise the tire made was a much better indicator of a flat than the computer.
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11-22-2006, 02:37 PM	#8
xyz123 Private First Class 9 Rep 141 Posts Drives: 2013 E82 Msport, manual Join Date: Jul 2005 Location: Toronto iTrader: (0)	I was astonished to read that the system that has a sensor inside the tire is set to alarm at 25% below the set pressure and that the external system that measures change in rolling diameter (as used on E90s up to now) is set to alarm at 30% below the set pressure. That folks, for a desired pressure of say, 34 psi would be 25.5 psi and 23.8 psi respectively. So, if you want your BMW to handle safely and the tires to not wear out before their time, you must, I repeat, must check the pressures with a proper gauge, preferably a Bourdon gauge like the old Drager (still have mine from the 1970's) or the BMW one that is available from the Parts Department.
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11-22-2006, 08:44 PM	#9
scubajag Scuba-JAG 24 Rep 528 Posts Drives: Jet Black 2006&07 B.R. E-92 Join Date: Jun 2005 Location: St. Petersburg, Fl iTrader: (0)	The tire pressure sensor is very accurate and as stated above will flash a warning at 30% less pressure than the starting pressure. I recommend checking tire pressure at all gas fill ups.
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