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70 messages, Last post on Mar 11, 2009 at 10:49 AM
You are in the Mazda CX-9 Forum. Your Hosts are steve_ & tidester
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Replying to: vikefan7 (Mar 05, 2009 3:47 pm) I purchased 4 new 18" rims, plus TPMS, plus 18" DMZ-3 Blizzaks shipped to my house for $1400 from TireRack. The Sport Edition Rims on TireRack are shiny and good enough for winter.
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Replying to: howardru (Mar 06, 2009 7:22 am) |
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Like post #62 mentioned, I bought the Sport Edition rims (SE-14) on tire rack in bright silver and the DMZ-3 Blizzaks. No TPMS. Total cost on Tire Rack is $1,124 before shipping. Our Mazda dealer agreed to offer us the same package through Tire Rack at their cost, which came to a little over $1,000 including tax and shipping. Great looking rims and wonderful winter tread. We don't rely on TPMS up here. Yesterday when I walked to work, it was negative 6 degrees f. Today it warmed up to 40. The very first week we bought the Mazda, when we still had the 20" rims and summer tires on, the TPMS light came on and turned off about 4 times due to the fluctuation in the temps. A below zero night and sunny 20 degree day will do it most times.
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Replying to: vermonter (Mar 06, 2009 1:33 pm) I did an experiment with my daughter on tire pressure vs MPG. At 60f when we tested it, the TPMS does not light up until somewhere between 20 to 25psi (i.e. OK at 25psi, light up at 20psi). Tires are warm up after low-speed driving. Basically, you were saying that -6f caused one of the tire to go below 25psi. The absolute zero is -273f. Temp fluctuation from -6 to 40f is less than 20% compared to 273f. The PSI change should be less than 6psi is it was 30psi. In short, I suspect one of your tires has low pressure (i.e. < 30psi). You might want to check for it.
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Replying to: ceric (Mar 06, 2009 7:11 pm) Actually, absolute zero is about -459.7° Fahrenheit which is about -273° Celsius. tidester, host SUVs and Smart Shopper
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Replying to: tidester (Mar 06, 2009 9:28 pm) Anyway, in that case, the % is more like 10% instead of 20%. That means a drop from 40f down to -6f will only cause 3psi difference.... If I am correct this time. 
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Replying to: ceric (Mar 06, 2009 9:51 pm) tidester, host SUVs and Smart Shopper
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Replying to: tidester (Mar 07, 2009 1:31 am) I'll reiterate that this only seems to happen when we have extreme temp fluctuations and is not an every day occurence. The dealer as well as a local garage said that TPMS often give false alarms in the colder winter climates.
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Replying to: vermonter (Mar 11, 2009 5:17 am) I can't say whether that is sufficient to trip the TPMS but those systems are supposed to be designed to deal properly with changes in ambient temperature. It could be that the threshold for triggering the lights is overly sensitive or the TPMS itself is defective. It would be interesting to know whether others have experienced this problem in other geographic locations. tidester, host SUVs and Smart Shopper |
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