PAVette

shopdog

The vote seems to be 4 to 1 in favor of the TPMS. The 4 tire pressure monitors agree. The odd man out is your handheld gage.

Vet

A while back I bought about six Accu-gage tire pressure gauges and compared them all to each other... and also compared them to about 4 or 5 other old gauges I had laying around. The Accu-gages were all within about 1 psi of each other, quite impressive. The other old less expensive gauges varied by +/- 5 psi... went in the trash. This doesn't mean that the one Accu-Gage you have is dead accurate though. It's quite possible that it's off by 1 or 1.5 psi.

When I set my tires cold to exactly 30 psi with any one of my Accu-gage pressure gauges, the DIC will read within 1 psi on all tires, usually dead on. (I'm pretty much at sea level.)

You can't make any determinations with just one gauge... unless it's known to be calibrated to perfection.

03 Z-oh-6

I compared my Accu-gage with another hand held gage, and they both read very close. So, it could be my TPS?

shopdog

The vote is now 4 to 2.

PT109

I live a mile high in Denver, Co. and my tpms always has read 2 to 3 psi less compared to my accu-gage. I set my tires cold based on the accu-gage at 30 psi, and have had perfect tire ware at 11,000 miles.

foremaw

jrda

I agree. Something doesn't seem right if your pressures increased that much with just a short drive. I usually see about a 3 lb increase after a long drive.

maxp

mwct

Ah well I am not sure on this so don't quote me, just what I experienced, but... when I first got my vette it had chrome wheels. I didn't think $2000 was a bargain to make my vette slightly more shiny so I told my dealer could I have the regular wheels instead. He said sure, but it would take some time for 07 wheels to come in, so he let me drive it around a while (I bought my car just before the 08s came in). TPMS was fine. Then I got the call to return my car to swap the chromes out for 08s because they had no 07 tires coming in anymore. I said sure what the heck. So that's what I did, but the dealer said he had to calibrate the TPMS for the new tires. Which he did. Then after awhile the calibration went off, and I had to return the car for recalibration. This was btw the only technical problem I had ever experienced with my vette.

Besides that, I think for any measuring device there has to be a way to calibrate it. It just makes common sense and is a good engineering principle.

GizmoZ

http://forums.corvetteforum.com/show....php?t=1815122