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Old 09-30-2021, 07:36 AM   #16
jadatis
Senior Member
 
Join Date: May 2013
Location: Holland ( Europe)
Posts: 178
Also keep in mind, that TMPS also introduces new things to worry about. Then if you learn, what is important, and what not, you yudge the readings better.

1. Temperature reading of external sensors isworthless, because it gives the temperature of the end of the valve, and not the gascompound in the tire ( fi air or Nitrogen).
And even internal sensors dont always give temp of inside tire gascompound, metal valves transport the temp of rimm and outside tire air to the sensor.

But you can calculate the pressure back from the pressure, rising.

For that I made a list.
Gives pressure filled at 70 degrF, and the temperature rising ( or lowering) per psi.
So look up the pressure you fill cold at 70 degrF back in this list, and remember or write down the degrF/psi behind it.

Then on the road if you see 5 psi pressure rising on tmps , multiply by the degrF/ psi, and add that to 70 degrF, and you know more exact the temperature of the inside tire .

Never 100% exact, but better then what sensor gives. And because of all the inacuracies also never exact. So you can do rough calculation by head while driving, acurate enaugh for the purpose.

Pressure measured at 70 degrF/ degrF per psi.

70degrF./degrF/psi

20 psi/ 15,5F/psi
21 psi/ 15F/psi
22 psi/ 14,5F/psi
23 psi/ 14 F/psi
24 psi/ 13,5F/psi
25 psi/ 13,5F/psi
26 psi/ 13 F/psi
27 psi/ 12,5 F/psi
28 psi/ 12,5 F/psi
29 psi/ 12 F/psi
30 psi/ 12 F/psi
31 psi/ 11,5 F/psi
32 psi/ 11,5 F/psi
33 psi/ 11 F/psi
34 psi/ 11 F/psi
35 psi/ 10,5 F/psi
36 psi/ 10,5 F/psi
37 psi/ 10 F/psi
39 psi/ 10 F/ps
40 psi/ 9,5 F/psi
42 psi/ 9,5 F/psi
43 psi/ 9 F/psi
45 psi/ 9 F/psi
46 psi/ 8,5 F/psi
49 psi/ 8,5 F/psi
50 psi/ 8 F/psi
53 psi/ 8 F/psi
54 psi/ 7,5 F/psi
58 psi/ 7,5 F/psi
59 psi/ 7 F/psi
63 psi/ 7 F/psi
64 psi/ 6,5 F/psi
70 psi/ 6,5 F/psi
71 psi/ 6 F/psi
77 psi/ 6 F/psi
78 psi/ 5,5 F/psi
86 psi/ 5,5 F/psi
87 psi/ 5 F/psi
96 psi/ 5 F/psi
97 psi/ 4,5 F/psi
109 psi/ 4,5 F/psi
110 psi/ 4 F/psi
126 psi/ 4 F/psi
127 psi/ 3,5 F/psi
148 psi/ 3,5 F/psi
149 psi/ 3 F/psi
177 psi/ 3 F/ps
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