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Tire pressure...FYI

14204 Views 14 Replies 8 Participants Last post by  LDYNREDD
I have a very accurate, professional grade tire gauge.....found that the cold pressure reading of my tires was 38psi....three over the rec. When I was rolling .... checked the pressures via the dic info page and they were up to 41!!!! So.....took the cold pressures down to 35 and now the "hot" rolling pressures are up to 37/38....much better road feel!
I did read somewhere that many vehicle manufacturers over inflate the tires prior to transport.....but the dealer should have checked that and taken the pressure down. The other important aspect of this is that these are "low profile tires" and they will "heat up" quickly and pressure will rise much faster than "normal ratio" tires! ....get a good gauge and check those pressure readings....better ride, better tire life!!
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I have found through years of GM vehicle ownership experience that whatever the DIC shows as the displayed tire pressure is not correct. The displayed tire pressure being shown on the DIC is 2 psi lower than the actual reading at the valve stem. I don't know why GM Engineers haven't just taken an algorithm/formula and programmed the sensors to display the correct tire pressure. GM's tire pressure sensors have shown the exact same deficit since the 1997 C5 Corvette introduced on board real time tire pressure sensors.
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