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    Tire pressure indicator different than tire guage

    The tire pressure indicator in the dash reads about 2-3 PSI higher than any of my tire gauges when doing a manual check. Both readings were taken with dead cold tires at the sametime. As I used three different tire gauges, two of which were Porsche gauges and all were within a 1 psi of each other. I'm confussed as to why I'd get such a large discrepency and as a result of the variance am having difficult time getting the cold tire pressure where I want it. Any thoughts ?

    Re: Tire pressure indicator different than tire guage

    I've been told that TPMS do not function properly until approx 10 minutes after start up-possibly so they are at their best with hot tires (realistically, what good are they on cold tires, you don't suffer catastrophic flats with the car parked) Try checking pressures with warm tires and see if they're more consistent.

    Re: Tire pressure indicator different than tire guage

    Mine is always a little bit lower
    The part where it showes if you have to add or take off some air is precise .

    Re: Tire pressure indicator different than tire guage

    Thanks.Will check the pressures hot. Car's only got 800 miles on it and has not yet indicated low air in any of the tires. Current readings when hot run 33 front and 40 rear. Book suggests these pressures are OK for my driving which is all street. Am new to this board after trading in the Boxster for the C4S. Was a big fan of the Boxster Board and got a lot of great info from the members. Looking forward to regular visits here.

    Re: Tire pressure indicator different than tire gu

    Check this website for information to download on our cars' TPMS system. I believe you can calibrate your system for acuracy with this info:



    http://www.beru.com/english/produkte/tss.php

     
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