11-08-2019, 07:12 AM | #1 |
Private First Class
29
Rep 122
Posts |
TPMS Accuracy
The Tire Pressure Monitoring System (TPMS) on my car consistently shows a difference in pressure reading versus a hand held electronic pressure gauge. Generally about 2-3 psi difference. Which is the more accurate, the TPMS or hand held pressure gauge? Does anyone else have a similar experience?
|
11-08-2019, 08:47 AM | #2 |
Colonel
1195
Rep 2,906
Posts |
There was a thread like this a couple months ago. Assuming you have a quality dial gauge I would trust that. My TPMS reads at least 2 pounds lower than both my gauges, which read the same, so I trust them.
|
Appreciate
0
|
11-08-2019, 12:34 PM | #3 |
Post Advisor
1631
Rep 1,692
Posts |
Funny, I was thinking this exact thing a couple weeks ago. I measure my pressures to be exact 0.1 every time and the car is always 1.5 to 2 PSI lower.
|
Appreciate
0
|
11-09-2019, 07:57 AM | #4 |
Private First Class
29
Rep 122
Posts |
I am going to retract my original post. Strangely, the day after I posted my original question the TPMS readings and electronic hand held pressure gauge readings were essentially identical, within +/- 0.2psi. Maybe related to an ongoing calibration function as I drove the car. Bottom line, I trust the TPMS readings.
|
Appreciate
0
|
11-09-2019, 09:12 AM | #5 |
Post Advisor
1631
Rep 1,692
Posts |
I still notice a difference between my digital gauge and TPMS. I use my digital gauge number as the max limit and TPMS as the minimum limit. Most importantly though, I make sure both the front and back tires are the same pressures relative to each other.
|
Appreciate
0
|
11-10-2019, 06:23 PM | #6 |
Lieutenant Colonel
370
Rep 1,698
Posts |
My indicator came on last night as the temps have been dropping into the 20's and 30's. I filled them up today and did notice that there's a small variance between what my gauge shows and the in-car reading. Not huge but up to maybe 2 PSI, and it did tend to show on the lower side (in car) versus the gauge.
I wonder if it's just calibrated that way for some extra margin of safety? Either way, not a huge deal.
__________________
2017 BMW 650xi Gran Coupe | MSport | Exec Package | Driver Assist Plus | ACC Stop & Go | Adaptive Drive | B&O | Night Vision | Cold Weather | Active Seats
2015 Audi R8 V10 | Brilliant Red on Black | S-Tronic | Carbon Sideblades | Carbon Trim | Full Leather | Sport Exhaust | Illuminated Doorsills | I-Pod | Contrast Stitching Previous: '14 550xi, '07 335i, '01 325i |
Appreciate
0
|
12-07-2019, 08:14 PM | #7 |
Private
14
Rep 51
Posts
Drives: e63 650i, F10 535i, E93 335i
Join Date: Jan 2013
Location: San Diego, CA
|
I have calibrated instrumentation that can measure PSIG to .01 and the TPMS on my old F10 was always within 3 tenths of a PSI. I you have air in your tires you will see a significant change in pressure as the tire temp changes, with nitrogen not so much.
__________________
2012 535i M-Sport PWG, Wagner FMIC, VSRF no meow, chargepipe, Walbro 450 with custom fuel lines, MHD map e30 2+, JB4 (monitor and logging only now), xHP Stage 3, K&N drop-in, Paddleshift retrofit
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|