Snow/Ice winter tires

708 messages, Last post on Nov 10, 2009 at 12:57 PM

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What is this discussion about? Tires, Wheels

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#211 of 708 Green Diamonds on a MINI by hpulley4 Dec 04, 2002 (7:26 am)
A guy on a MINI list I subscribe to has 195/60R15 Green Diamonds on his MINI. As far as snow, etc. is concerned they seem to work fine but they set off the tire pressure monitor more easily than they should when nothing is wrong with the pressure. The pressure monitor in the MINI actually uses the ABS wheelspin detectors and it assumes that changing wheelspin in situations other than cornering or low traction means a tire is going down. I suspect that the retread tires may not be perfectly matched or balanced -- perhaps they were not mounted properly or perhaps this is 'normal' for retreads in which case the owner's manual warning about not using them in MINIs would be correct. With tire pressure monitors becoming mandatory soon, Green Diamonds will have to do something about this, if indeed it is a problem. If he rebalances the tires and the problem goes away I'll post again.
#212 of 708 tire pressure monitors? by anonymous02 Dec 04, 2002 (12:26 pm)
???? and mandatory? ???? ????????
#213 of 708 2004 vehicles in USA must have pressure monitors by hpulley4 Dec 04, 2002 (1:25 pm)
http://www.nhtsa.dot.gov/cars/rules/rulings/TirePresFinal
#214 of 708 pressure monitor by anonymous02 Dec 04, 2002 (1:38 pm)
That's news to me. Who pays for that? I doubt the DOT pays. Let me guess, the consumer? Taxpayers? (Oh yeah, the DOT IS taxpayer money!)
#215 of 708 How does this pressure monitor work? by anonymous02 Dec 04, 2002 (1:52 pm)
Is it just an idiot light on your dash panel? Something for which the fuse can be removed? I wonder how it will work when you air down your tires to 10-15 PSI for trails. ???
#216 of 708 tire pressure monitor by krzyss Dec 04, 2002 (2:44 pm)
There are two kinds: - telematic (?) pressure monitor inside each tire (possibly mounted to the wheel) transmitting pressure to receiver (it can be portable or in the car). - ABS based - it deducts loss of pressure from different rotating speeds and because of it it might be prone to error. I guess if all 4 tires lose pressure simultanously it wil not detect anything. Krzys PS It might not be true, just my knowledge.
#217 of 708 I've always wondered by idletask Dec 04, 2002 (2:55 pm)
about that ABS based stuff. Traction control also uses the same sensors, I wonder how the whole system differentiates a pressure loss from a wheel slippage.
#218 of 708 of course... by anonymous02 Dec 04, 2002 (3:13 pm)
It is useless for those who disable their ABS systems... (rolls eyes!)
#219 of 708 pressure monitors by hpulley4 Dec 04, 2002 (4:59 pm)
Of course the consumer pays, the same way they pay for other mandatory safety equipment like airbags. It is a light on the dash. It can be reset at any time by pressing a button so that it doesn't go off after changing wheels, adding or removing air, etc. How does it tell the difference between traction loss and air loss? I'm not sure myself but I suspect the engineers thought about it for a little while My car has both traction control (which also has an idiot light in case you don't notice the system kicking in) and a pressure sensor run off the ABS and when I changed wheels & tires the air pressure light went on -- when I am in snow the traction light goes on (flashes) so it seems like they got it right. If you pull the fuse for ABS then of course you lose traction control and pressure monitoring as well. I like all three systems so I leave the fuse in, thanks!
#220 of 708 traction vs air loss... by robr2 Dec 04, 2002 (5:30 pm)
...by reading NHTSA's description, it sounds like the indirect systems compare current rotational speed to some average stored in the system. I presume that it will need to be programmed to ignore short differences in the rotational speed to deal with traction loss. If not, the idiot light will come on every few seconds if you are driving a car in snow/ice without traction control. More than likely, the system will measure differences over a set time period before warning.