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Thread: Road Trip!! Tire Pressure

  1. #1
    hanks is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Oct 2007

    Road Trip!! Tire Pressure

    Tomorrow we start our first road trip in our Lt. Platinum 2008 SRX. V8MRC,Luxury pkg,Ultraview,Sport pkg,18" wheels. Had oil changed at 1200 miles (2235 now)
    When I put air in tires-30 front,32 rear with a very accurate guage which reads to 1/2 lb, the DIC reads 32and 34. Which should I believe? Are the Tire Pressure monitors more accurate, or is 2 lbs nothing to worry about?

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  3. #2
    sgilbert's Avatar
    sgilbert is offline Cadillac Owners Connoisseur
    Automobile(s): ('04 SRX N* AWD) '11 Lincoln MKT AWD
    Join Date
    Mar 2004
    South Bend, IN

    Re: Road Trip!! Tire Pressure

    If you're sure your guage is correct-----stick with it's readings. The TPMs are not highly accurate.

  4. #3
    RobVuk is offline Cadillac Owners Fanatic
    Automobile(s): 2008 SRX V8 AWD Sport
    Join Date
    Oct 2007
    Nashville, TN & Chicago

    Re: Road Trip!! Tire Pressure

    Both my SRX and my Corvette are dead nuts on the money with my $100 tire gauge. But if you're only off 1 or 2 lbs. it's not much to worry about.

  5. #4
    dkozloski's Avatar
    dkozloski is online now Cadillac Owners 10000+ Posts
    Automobile(s): 2006 STS V8 AWD, '95 Ford Ranger
    Join Date
    Jul 2004
    Fairbanks, Ak

    Re: Road Trip!! Tire Pressure

    The TPMS is far more accurate than almost any tire pressure gage you can buy on the street. The reason for discrepancies is update rates and the fact that 1/2 mile of driving will cause a significant amoumt of temp/pressure increase. When the vehicle is stopped for more than a short while the TPMS update rate drops to once per hour. The car has to be moving at least 20 MPH for the update rate to increase and by that time the pressures have already started to build. Check the tire pressures in the morning before you move the car but don't adjust them. Check the TPMS also before you start to move for best correlation.
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