Air Pressure Gauge PSI doesn't match with TPMS PSI
#1
Air Pressure Gauge PSI doesn't match with TPMS PSI
i like filling my own air pressures, and making sure they're accurate given the temp outside. i have one of those cheap air pressure gauges that you can buy at autozone. i thought i filled my fronts at 33 and rears at 39, but according to the TPMS, they're at 36 and 43! i took out a little air pressure, but left it a little above 33/39 because i'm taking a trip this weekend and there's gonna be 3 people in the car.
what gives with the discrepancy between the two?
should i go with the TPMS readout? also, can anyone recommend a more accurate air pressure gauge? i don't know much about them
thanks in advance!
what gives with the discrepancy between the two?
should i go with the TPMS readout? also, can anyone recommend a more accurate air pressure gauge? i don't know much about them
thanks in advance!
#2
My 09 997S TPMS readings are right on perfect. I have a high end Longacre air gauge and it and TPMS agree.
I bet your Autozone gauge is wrong.
For around $50 you can get a digital Longacre gauge...or even the digital Griots Garage gauge that reads in tenths is accurate.
I bet your Autozone gauge is wrong.
For around $50 you can get a digital Longacre gauge...or even the digital Griots Garage gauge that reads in tenths is accurate.
#3
I have an accurate racing gauge - verified against three other gauges - TPMS consistantly reads 4 - 5 psi low - major PITA. I had the car in to the dealer when still under warranty and was told that that's this just the way it is. I would love to know if there is a Porsche spec. for TPMS accuracy - I have to run my tires several psi high to keep the warning lights off. Arrghh...
#4
I have a Moroso racing gauge with a bleed valve, and TPMS always reads a few lbs higher. I haven't resolved the issue yet either, but I think the moral of the story here is that TPMS is frequently wrong.
#5
It seems the 997.2 TPMS is far more accurate than the older systems. My '09 C2s is spot on. My '07 997.1 system never agreed with the gauges. Use a quality pressure gauge(s) as primary. I'll periodically verify the gauge's accuracy with a calibrated pressure panel.
#7
the tpms on the 997.1 are +/- 3-5 lbs. they're typically very precise but not very accurate - they're consistent how far they're off.
the 997.2 seem to be a new generation, much better.
in any regard, the tpms is really used to detect delta's, not absolute pressures...
the 997.2 seem to be a new generation, much better.
in any regard, the tpms is really used to detect delta's, not absolute pressures...
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#9
++ on that........same thing. My TPMS is in-sync with my Longacre.
#13
unfortunately, you can't upgrade them because they're not all compatable with PCM