Logger: Custom Gauges - Proper Vacuum Calculations

covertrussian · **Joined:** Tue Jan 28, 2014 10:48 am **Posts:** 120

Is it possible to do a custom calculated gauge through a logger definition file?

I would like to make the MAP gauge calculate in/Hg instead of PSI. It would be a conditional based on 0psi mark, if below 0psi, return PSI * 2.03602, if above 0 psi return PSI.

dschultz · **Posted:** Thu Nov 19, 2015 6:49 pm

Yes to can.
Look in the latest Logger def file for the use of the IF expression.
Search for: expr="if(

covertrussian · **Joined:** Tue Jan 28, 2014 10:48 am **Posts:** 120

Pretty awesome! Which gauge would you suggest using? I usually use P25 - Manifold Relative Pressure, but it seems like E113 - Manifold Relative Pressure (4-byte) might be a better choice based on the description.

In which case this did the trick for E113:

Code:

<conversion units="psi/inHg relative" storagetype="float" expr="if(x*0.01933677&lt;0,x*0.03937,x*0.01933677)" format="0.00" gauge_min="-40" gauge_max="60" gauge_step="10" />

covertrussian · **Joined:** Tue Jan 28, 2014 10:48 am **Posts:** 120

I think that did the trick, when in vacuum the values are very close to Manifold relative pressure (inHg) and when it's in boost the values are very close to Manifold Relative (psi).

Code:

Manifold Relative Pressure (psi)   Manifold Relative Pressure (4-byte)* (psi/inHg relative)   Manifold Relative Pressure (Corrected) (inHg)
-7.25   -14.84   -15.06
-7.4   -15.02   -15.06
-7.4   -15.12   -15.36
-7.55   -15.56   -15.36
-8.42   -17.39   -16.83
-9.14   -18.87   -18.6
-9.72   -19.91   -19.79
-10.01   -20.45   -20.38
-10.16   -20.7   -20.67
-10.16   -20.38   -20.97
-6.67   -12.87   -14.47
-5.66   -11.34   -11.81
-5.8   -12.25   -11.81
-6.67   -13.63   -13.58
-6.82   -13.76   -13.88
-6.82   -13.86   -13.88
-6.82   -13.86   -13.88
-6.82   -13.83   -13.88
-6.82   -13.81   -13.88
-6.67   -13.63   -13.88
-5.8   -10.89   -12.11
-2.47   -3.08   -7.09
0.29   0.49   0.3
1.16   1.31   2.07
2.03   2.15   3.84
2.9   3.12   5.32
3.92   4.01   7.68
4.93   5.14   9.74
5.95   6.3   12.4
7.25   7.46   14.76
8.27   8.61   17.13
9.43   9.52   19.19
10.16   10.18   20.67
10.45   10.64   21.56
10.88   10.84   22.15
10.88   10.89   22.44
11.03   11.06   22.74
11.03   11.08   22.74
11.03   10.85   22.74
4.5   2.52   12.11
-2.76   -7.62   -4.13
-6.09   -13.42   -12.11
-8.13   -17.08   -16.24
-9.43   -19.45   -18.6
-10.01   -20.48   -20.38
-10.3   -21.08   -20.67
-10.45   -21.25   -21.26
-10.45   -21.25   -21.26
-10.45   -21.2   -20.97
-10.45   -21.15   -20.97
-10.45   -21.14   -20.97
-10.45   -21.14   -20.97
-10.45   -21.22   -20.97
-10.45   -21.24   -21.26
-10.45   -21.24   -21.26
-10.45   -21.24   -21.26
-10.45   -21.24   -21.26
-10.45   -21.22   -21.26
-10.45   -21.19   -20.97
-10.45   -21.15   -20.97
-10.45   -21.12   -20.97
-10.3   -21.07   -20.97
-10.3   -21.05   -20.97
-10.3   -20.95   -20.97
-10.3   -20.8   -20.67
-10.01   -20.51   -20.38
-10.01   -20.17   -20.08
-9.72   -19.8   -19.79
-9.72   -19.48   -19.49
-9.43   -19.18   -19.19
-9.29   -18.86   -18.9
-9.29   -18.77   -18.6
-9.14   -18.72   -18.6
-9.14   -18.69   -18.6
-9.14   -18.77   -18.6
-9.29   -18.79   -18.6
-9.29   -18.84   -18.6
-9.29   -18.94   -18.6
-9.29   -19.09   -18.9
-9.43   -19.17   -19.19
-9.43   -19.19   -19.19
-9.43   -19.19   -19.19
-9.43   -19.19   -19.19
-9.43   -19.19   -19.19
-9.43   -19.19   -19.19
-9.43   -19.19   -19.19
-9.43   -19.19   -19.19
-9.43   -19.14   -19.19
-9.43   -19.14   -19.19
-9.43   -19.14   -19.19
-9.43   -19.12   -19.19
-9.43   -19.1   -19.19

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