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tire pressure monitoring question
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I just bought an '08 on Sunday and experienced my first flat tire today. Thank god for the running flat system, but frustrating as it cost me 300.00. |
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so if you deflate a tire as a test, it won't alarm you unless you drive on it for a while?
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'08 X5 3.0si - Alpine White / Saddle Brown interior Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights Coded: Digital speedo, windows/sunroof/tailgate close via keyfob X5 pics at Flickr |
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It does automatically register the flat when you put your key in the ignition. You'll get the iDrive warning and the red "flat tire" icon.
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I don't think the X5 still uses BMW's old flat tire monitoring system of tracking changes in rolling circumference. My 2005 545i used that system and it did not have the TPM valve stems on each wheel. Newer models now have the latter which should be able to tell the exact PSI of each tire, but BMW apparently chooses to not provide that info to the driver.
Many "lesser" makes (e.g. my Honda minivan) provide tire pressure readings.
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2008 X5 4.8i, Jet Black, Tobacco Nevada leather & just about everything else (no vent. seats, no 3rd row) |
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> I don't think the X5 still uses BMW's old flat tire monitoring system of tracking changes in rolling circumference.
Everything I have seen, including the owner's manual, says it is a direct pressure measurement system now in the U.S. Perhaps in other countries they still use the cheaper circumferencediferential montitoring system. I believe it is now a legal requirment in the U.S., and that the old indirect systems do not meet the performance standards, e.g., if all four tires deflate an equal amount, current indirect systems will not detect it. NHTSA requires vehicles to be equipped with a system which can detect such uniform loss of pressure. http://www.xoutpost.com/tire-wheel-br...-info-fyi.html Last edited by Penguin; 07-12-2008 at 05:10 PM. |
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I thought the newer E70s have "in wheel" real time pressure monitoring,
but I could be mistaken, as I don't have the E70... RealTime is the deal, but the "indirect method" was the "granny/soccerMom" compromise, and the indirect method is still used in many models of many brands. The pressure loss trigger value, while mandated on the low/less acute side, is also variable, if within the specs on pressure loss, per make and model; some mfg's that use the indirect method use a "quicker/sooner" pressure loss than others. -Boring azz NHSTA pdf: http://www.tireindustry.org/pdf/TPMS_FinalRule_v3.pdf -In a nutshell from the tire lobby: http://www.tireindustry.org/governme...s_comments.asp Real Time TPMS has been std on Vettes for a long time...the runflat tire deal made it a req'd system. My50Cts is up... GL,mD
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On my X5 in the USA, I believe the TPM works as significant change in the pressure compare to the basis setting. When I picked up my X5 from the dealer, the tire pressure was at least 10 PSI higher than what was recommended in the manual. After I reduced the pressure, X5 showed the low tire pressure warning. So, I reset the setting which removed the warning message. I don't recall seeing any actual tire pressures.
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2011 BMW 740i 2011 Toyota Sienna Limited 2008 X5 3.0 Space Gray (sold) |
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